mybatis 注入mapper的问题 5C

mybatis动态代理mapper(interface),然后用@Res..注入一直报错,然后无奈用了配置文件,
在service层用get/set方法来做,发现这个MAPPER还是空的!!

@Service("testService")
public class TestServiceImpl implements TestService{

private TestMapper testMapper;


public TestMapper getTestMapper() {
    return testMapper;
}


public void setTestMapper(TestMapper testMapper) {
    this.testMapper = testMapper;
}


@Transactional
@Override
public Object tset1(){  
    TestMapper mapper = ApplicationContextFactory.getBean("testMapper", TestMapper.class);
    mapper.insertOne();
    throw new RuntimeException("test");
}

}

如上,但是ApplicationContextFactory.getBean又可以取到并且操作,扫描包应是没问题的,不然应该会报错吧

12个回答

@Autowired
private TestMapper testMapper;

qq_39015948
qq_39015948 试过的 报错了
2 年多之前 回复

你mapper加上
@Component("testmapper")
@Mapper
public interface TestMapper{

用@Resource注入试一试
@Resource(name="testmapper")
private TestMapper testMapper;

qq_39015948
qq_39015948 试了一下还是不行 ,用注解的话,找不到testMapeer这个bean
2 年多之前 回复

你的类变量testMapper只是声明了bean,但是并没有注入到这个类里面来。
这段代码看起来并没有错误。不过有可能是因为没有截图完。
@Autowired/@resource两个注解都是可以的。
private TestMapper testMapper;

aquriushu
aquriushu 没有被扫描到的bean里注入bean当然是注入不成功的。另外,注入bean不用再添加get/set
2 年多之前 回复
aquriushu
aquriushu 回复qq_39015948: testService都没有被扫描到啊亲
2 年多之前 回复
qq_39015948
qq_39015948 用注解的话就会报错,可以看我昨天才发的一个问题,也是这个,NoSeachBean的那个错误,这个bean只用通过appliciton.getBean可以取到,我也不知道为什么
2 年多之前 回复

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'testService': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.zcloudMVC.mapper.TestMapper] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@javax.annotation.Resource(shareable=true, mappedName=, description=, name=, type=class java.lang.Object, authenticationType=CONTAINER, lookup=)}
这是用注解报的错





这是配置文件,mapper注入到service的


@Service("testService")

public class TestServiceImpl implements TestService{

private TestMapper testMapper;


public TestMapper getTestMapper() {
    return testMapper;
}


public void setTestMapper(TestMapper testMapper) {
    this.testMapper = testMapper;
}


@Transactional(propagation=Propagation.REQUIRED,rollbackFor=Exception.class)
@Override
public Object tset1(){  
    TestMapper mapper = ApplicationContextFactory.getBean("testMapper", TestMapper.class);
    mapper.insertOne();
    throw new RuntimeException("test");
}

}

用配置文件方式的service

mapper 相当于hibernate的dao 组件了,需要被spring扫描到,检查一下spring的配置文件:

....



qq_39015948
qq_39015948 我在spring里面配置了扫描service和mapper的,但是mybatis代理了mapper不是自动注入进容器了嘛,关键是getBean是可以取到的,注解却不行
2 年多之前 回复
<bean name="testService" class="com.zcloudMVC.service.impl.TestServiceImpl">
    <property name="testMapper">
        <ref bean="testMapper" />
    </property>
</bean>

这是配置文件mapper到 service的

哎呦, 手敲的代码竟然都不见了


<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.xxx.xxx.*.dao" />
</bean>
qq_39015948
qq_39015948 你看看楼下,是我的,这个是没问题的
2 年多之前 回复
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.zcloudMVC.mapper;com.emacle.docm.mapper" />
</bean>
共12条数据 1 尾页
Csdn user default icon
上传中...
上传图片
插入图片
抄袭、复制答案,以达到刷声望分或其他目的的行为,在CSDN问答是严格禁止的,一经发现立刻封号。是时候展现真正的技术了!
其他相关推荐
关于mybatis通用mapper的问题。

项目是maven管理的,用的mybatis+spring,单表的CRUD都需要手写,感觉很麻烦。于是网上找了通用mapper的配置方法。 在POM.XML加入了 <dependency> <groupId>tk.mybatis</groupId> <artifactId>mapper</artifactId> <version>${mapper.version}</version> </dependency> <dependency> <groupId>javax.persistence</groupId> <artifactId>persistence-api</artifactId> <version>1.0</version> </dependency> 这两个包配置。 然后新建了一个基本业务接口 ``` public interface BaseService<T>{ } ``` 基本业务接口的实现类: ``` @Service public abstract class BaseServiceImpl<T> implements BaseService<T> { CrBaseMapper<T> crBaseMapper; @Resource CourseMapper courseMapper; public int add(T entity, boolean insertSelective) { if (insertSelective) { return this.crBaseMapper.insertSelective(entity); } return this.crBaseMapper.insert(entity); } public int delete(T entity) { return this.crBaseMapper.deleteByPrimaryKey(entity); } public int update(T entity, boolean updateSelective) { if (updateSelective) { return this.crBaseMapper.updateByPrimaryKeySelective(entity); } return this.crBaseMapper.updateByPrimaryKey(entity); } public T get(Long pk) { return this.crBaseMapper.selectByPrimaryKey(pk); } public List<T> selectAll() { return this.crBaseMapper.selectAll(); } } ``` 然后就是基本DAO接口: ``` @Repository public abstract interface CrBaseMapper<T> extends Mapper<T> { } ``` 。 最后在applicationContext.xml也进行了如下的配置: ``` <bean class="tk.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.isea533.mybatis.mapper"/> <property name="properties"> <value> mappers=tk.mybatis.mapper.common.Mapper </value> </property> </bean> <context:component-scan base-package="com.insi.cream"/> ``` 是哪里配置有问题吗,为什么启动时候还是提示 Error creating bean with name 'crBaseMapper' defined in file? 求大神解答,感激不仅!!!!~~~~

如何用属性注入的方式为spring的service注入Mybatis的Mapper对象?

万能的网友的。帮帮我吧。 spring+Mybatis+struts2整合中遇到一个问题:service层中不知道如何注入Mapper对象啊。 首先我分三层。action---> service---->Mapper(充当dao层)。 我的Mapper是扫描包生成实现类的。然而我的service里面有一个Mapper对象。 就像这样: public class ProductService { //@Autowired private ProductMapper productMapper; public void setProductMapper(ProductMapper productMapper) { this.productMapper = productMapper; } //省略其他代码。。。 } 然后我想通过setter方法将productMapper注入到ProductService中。 我的配置文件如下: <bean id="Mapper" class="org.mybatis.spring.mapper.MapperScannerConfigurer" > <property name="basePackage" value="wm.mapper" /> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> </bean> <bean id="productService" class="wm.service.ProductService" scope="prototype" > <property name="productMapper" ref=""></property> </bean> 写到这里,我忽然愣住了。这是我不知道ref该怎么写。或者还是value怎么写。如果用注解注入的话,我能解决这个问题。但是如果我用属性注入的方式怎么实现呢?大神们,没有分。不好意思啊。

@autowired注入mapper为null

service ``` @Service public class UserServiceImpl implements UserService { @Autowired private UserMapper userMapper; @Override public int insertUser(User user) { int result=userMapper.insert(user); return result; } } ``` spring-dao ``` <context:component-scan base-package="com.zone.service"></context:component-scan> <context:property-placeholder location="classpath:resource/*.properties"/> <!-- 数据库连接池 --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close"> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> <property name="driverClassName" value="${jdbc.driver}" /> <property name="maxActive" value="10" /> <property name="minIdle" value="3" /> </bean> <!-- spring管理sqlSessionFactory --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 数据库连接池 --> <property name="dataSource" ref="dataSource"></property> <!-- 加载mybatis的全局配置文件 --> <property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml"></property> </bean> <!-- 配置扫描包,加载mapper代理对象 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.zone.mapper"></property> </bean> ``` 包 ![图片说明](https://img-ask.csdn.net/upload/201812/11/1544516161_946392.png)

AOP切mybatis的mapper接口,切不到接口上的annotation

如题,一个springboot项目,mapper接口上有自定义的类型级注解PrivateDatasource, 表达式如下: @Around("execution(* com.nbst.dao.mapper.idevcloudweb.*.*(..)) && @target(privateDatasource)") 切接口是切不到注解,但是自己给一个普通类上加上注解就可以切到,请问有大佬能给解答一下么 切面类: @Aspect @Component public class DataSourceAspect { @Around("execution(* com.nbst.dao.mapper.idevcloudweb.*.*(..)) && ( @target(privateDatasource) || @annotation(privateDatasource) )") public Object beforeMapper(ProceedingJoinPoint joinPoint,PrivateDatasource privateDatasource){ Signature sig = joinPoint.getSignature(); String method = sig.getName(); System.out.println("方法名:"+sig.getName()); if(privateDatasource == null){ Object target = joinPoint.getTarget(); privateDatasource = target.getClass().getAnnotation(PrivateDatasource.class); } System.out.println(privateDatasource.value()); return null; } } mapper接口: @PrivateDatasource public interface CompanyMapper 同一路径下的用于测试的类: @PrivateDatasource @Component public class Test { public void say(){ System.out.println("test"); } } 根本切不到带注解的接口,也就是无法注入注解对象作为参数,但是普通类是可以切到、并且将注解对象作为参数注入的

将mybatis的mapper作为参数传递,通过反射调用,请问该如何处理了?

我必须得将mapper作为参数来进行传递,在进行反射调用方法的时候,就会报错。请问这种情况我该如何处理,才能够实现这一要求了? ``` @Configuration @EnableScheduling public class aaa { // Mapper是个接口 @Autowired private TestMapper testpMapper; @Scheduled(cron = "0/5 * * * * ?") private void createOrderTableTime() { // try { // determineCreateTable((Class<? extends BaseMapper>) Class.forName(testMapper.getClass().getName())); determineCreateTable(testMapper.getClass()); // } catch (ClassNotFoundException e) { // e.printStackTrace(); // } } // public void determineCreateTable(Class<? extends BaseMapper> tableMapper) { public void determineCreateTable(Class tableMapper) { try { Method method = tableMapper.getDeclaredMethod("count", String.class); // 这种是可行的 // int count = (int) method.invoke(testMapper, "100001"); // int count = (int) method.invoke(tableMapper, "100001"); // 在进行实例化的时候会产生错误 int count = (int) method.invoke(tableMapper.newInstance(), "100001"); System.out.println(count); } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException | InstantiationException e) { e.printStackTrace(); } } } 报错信息如下: java.lang.IllegalArgumentException: object is not an instance of declaring class java.lang.InstantiationException: com.sun.proxy.$Proxy88 ```

ssm整合mapper注入失败

spring配置文件 <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd"> <!-- 加载资源文件 --> <context:property-placeholder location="classpath:db.properties" /> <!-- 开启注解扫描 --> <context:component-scan base-package="com.spring"></context:component-scan> <!-- 配置数据源,并设置数据源 --> <bean id="c3p0DataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="user" value="${jdbc.username}"></property> <property name="password" value="${jdbc.password}"></property> <property name="jdbcUrl" value="${jdbc.url}"></property> <property name="driverClass" value="${jdbc.driver}"></property> <property name="maxPoolSize" value="500"></property> </bean> <!-- 配置sqlsessionfactory --> <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="c3p0DataSource"></property> <property name="configLocation" value="classpath:SqlMapConfig.xml"></property> </bean> <!-- 批量配置mybit的mapper接口,默认bean的id为类名首字母小写 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.spring.dao"></property> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactoryBean"></property> </bean> <!-- jdbc事务管理器 --> <bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="c3p0DataSource"></property> </bean> <!-- 事务通知 --> <tx:advice id="txAdvice" transaction-manager="dataSourceTransactionManager"> <tx:attributes> <tx:method name="*" isolation="DEFAULT" propagation="REQUIRED" /> </tx:attributes> </tx:advice> <aop:config> <aop:advisor advice-ref="txAdvice" pointcut="execution(* com.spring.dao.*.*(..))" /> </aop:config> </beans> springmvc配置 <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd"> <!-- 开启注解扫描 --> <context:component-scan base-package="com.spring"></context:component-scan> <mvc:annotation-driven /> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsps/"></property> <property name="suffix" value=".jsp"></property> </bean> </beans> <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> mybatis <configuration> <settings> <setting name="lazyLoadingEnabled" value="true" /> <setting name="aggressiveLazyLoading" value="false" /> <setting name="logImpl" value="LOG4J" /> </settings> <mappers> <mapper resource="com/spring/dao/Student.xml" /> </mappers> </configuration> 映射文件 <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.spring.dao.StudentMapp"> <insert id="addStudent" parameterType="com.spring.dao.Student"> INSERT student (student_name) VALUES(#{student_name}) </insert> <delete id="delete"> delete from student where studentid=#{id} </delete> <select id="findstudentbyid" parameterType="int" resultType="com.spring.dao.Student"> select * from student where studentid=#{id} </select> <select id="findAllstudent" resultType="com.spring.dao.Student"> select * from student </select> <update id="update" parameterType="com.spring.dao.Student"> update student set student_name=#{student_name} where studentid=#{studentid} </update> </mapper>

spring+mybatis 配置mapper扫描无法注入

``` applicationContext.xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <!--获得属性文件里面的键值 --> <!-- <context:property-placeholder location="classpath*:*.properties" /> --> <!--扫描需要容器管理的类--> <context:component-scan base-package="com.nb"/> <!-- 数据源 --> <bean name="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName"> <value>com.mysql.jdbc.Driver</value> </property> <property name="url"> <value>jdbc:mysql://127.0.0.1:3306/mynb?useUnicode=true&amp;characterEncoding=UTF-8</value> </property> <property name="username"> <value>root</value> </property> <property name="password"> <value>123456</value> </property> </bean> <!-- ================================ MyBatis SqlSession配置 ========================================= --> <!-- 使用SqlSessionFactoryBean工厂产生SqlSession对象,方便后期注入Dao --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <!-- <property name="configLocation" value="classpath:configuration.xml"></property>--> <!-- 自动扫描entity目录, 省掉Configuration.xml里的手工配置 --> <property name="mapperLocations" value="classpath*:com/nb/dao/*.xml" /> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.nb.dao" /> <!-- <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /> --> </bean> <!-- ================================= 事务控制相关 ============================================= --> <bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"></property> </bean> <tx:advice id="txAdvice" transaction-manager="transactionManager"> <tx:attributes> <tx:method name="delete*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" no-rollback-for="java.lang.RuntimeException"/> <tx:method name="insert*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.RuntimeException" /> <tx:method name="update*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" /> <tx:method name="find*" propagation="SUPPORTS"/> <tx:method name="get*" propagation="SUPPORTS"/> <tx:method name="select*" propagation="SUPPORTS"/> </tx:attributes> </tx:advice> <aop:config> <aop:pointcut id="pc" expression="execution(* *.*.*(..))" /> <aop:advisor pointcut-ref="pc" advice-ref="txAdvice" /> </aop:config> </beans> 请问是什么原因呢,帮忙看看,谢谢

spring mvc整合mybatis 为什么不把mapper接口类直接注入Controller呢

# spring mvc整合mybatis 为什么不把mapper接口类直接注入Controller呢? 正常开发如下: 1、mapper.xml,mapper接口类,service接口,serviceImpl实现类,Controller控制类 2、serviceImpl实现类注入mapper接口类,在Controller控制类中注入service接口 ## 问题1、为什么不直接把mapper接口类注入到Controller控制类中应用呢? ## 问题2:或者设计一个公用执行方法类,该类实现applicationContextAware接口,然后直接在spring容器中获取已经实例化的mapper接口,通过反射原理执行该接口的某个指定方法。最后在controller类中的方法里直接调用该类执行由前端传进来的方法名 请问各位大神这两种情况有什么影响呢?

spring3+mybatis 注入空指针问题,请各位帮忙一下。

大家好,我刚学习三大框架,碰到一个空指针问题怎么都解决不了,快3天了,请帮忙下,谢谢了。 我测试所有的注入都是空指针 applicationContext.xml ``` <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:jdbc=" http://www.springframework.org/schema/jdbc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd" default-autowire="byName" default-lazy-init="false"> <!-- 开启自动扫描并注册Bean定义支持 --> <!-- <context:component-scan base-package="cn.xhf"></context:component-scan> --> <!-- 采用注释的方式配置bean --> <!-- <context:annotation-config /> --> <!-- 配置datasource源 --> <context:property-placeholder location="classpath:mysql.properties" /> <!-- 使用mysql配置属性值 --> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="${driver}" /> <property name="url" value="${url}" /> <property name="username" value="${username}" /> <property name="password" value="${password}" /> <property name="maxActive" value="${maxActive}"></property> <property name="maxIdle" value="${maxIdle}"></property> <property name="maxWait" value="${maxWait}"></property> <property name="defaultAutoCommit" value="${defaultAutoCommit}"></property> </bean> <!-- 配置sqlSessionFactory,同时制定数据源 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="configLocation" value="classpath:Configuration.xml" /> </bean> <!-- 配置SqlSessionTemplate --> <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate"> <constructor-arg index="0" ref="sqlSessionFactory" /> <constructor-arg index="1" value="BATCH" /> </bean> <!-- 配置dao --> <bean id="booksDao" class="cn.xhf.dao.impl.BooksDaoImpl"> <property name="sqlSession" ref="sqlSession"></property> </bean> <bean id="usersDao" class="cn.xhf.dao.impl.UsersDaoImpl"> <property name="sqlSession" ref="sqlSession"></property> </bean> <!-- 配置service --> <bean id="booksService" class="cn.xhf.service.impl.BooksServiceImpl" scope="prototype"> <property name="booksDao" ref="booksDao"></property> </bean> <bean id="usersService" class="cn.xhf.service.impl.UsersServiceImpl" scope="prototype"> <property name="usersDao" ref="usersDao"></property> </bean> <!-- 配置action --> <bean id="booksAction" class="cn.xhf.action.BooksAction" scope="prototype"> <property name="booksService" ref="booksService"></property> </bean> <bean id="usersAction" class="cn.xhf.action.UsersAction" scope="prototype"> <property name="usersService" ref="usersService"></property> </bean> <!-- 配置事务管理器 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <!-- 通知 --> <tx:advice id="txAdvice" transaction-manager="transactionManager"> <tx:attributes> <tx:method name="delete*" propagation="REQUIRED" /> <tx:method name="insert*" propagation="REQUIRED" /> <tx:method name="update*" propagation="REQUIRED" /> <tx:method name="find*" read-only="true" /> <tx:method name="get*" read-only="true" /> <tx:method name="select*" read-only="true" /> </tx:attributes> </tx:advice> <!-- 切面配置 --> <!-- <aop:config> <aop:pointcut expression="execution(* cn.xhf.service.*.*(..))" id="method" /> <aop:advisor advice-ref="txAdvice" pointcut-ref="method" /> </aop:config> --> </beans> ``` dao层 ``` package cn.xhf.dao.impl; import java.util.ArrayList; import java.util.List; import org.apache.ibatis.session.SqlSession; import org.springframework.beans.factory.annotation.Autowired; import cn.xhf.dao.BooksDao; import cn.xhf.pojo.Books; /** * */ public class BooksDaoImpl implements BooksDao { private SqlSession sqlSession; //就是这个空指针 ,其他bean也是空 @Override public int deleteBooksById(String bid) { return sqlSession.delete("books.deleteBooksById", bid); } @Override public int updataBooksById(String bid) { return sqlSession.update("books.updataBooksById", bid); } @Override public List<Books> findAll() { List<Books> booksList = new ArrayList<Books>(); booksList = sqlSession.selectList("books.findBooks"); return booksList; } @Override public List<Books> findBooksByKeyword(String bookName, String bookAuthor) { List<Books> bookList = new ArrayList<Books>(); // Books books = new Books(); // books.setBookName(bookName); // books.setBookAuthor(bookAuthor); // bookList = sqlSession.selectList("books.findBooks", books); return bookList; } @Override public int insertBooks(Books books) { return sqlSession.insert("books.insertBooks", books); } public SqlSession getSqlSession() { return sqlSession; } public void setSqlSession(SqlSession sqlSession) { this.sqlSession = sqlSession; } } ``` test方法 ``` package cn.xhf.pojo; import java.util.List; import cn.xhf.dao.BooksDao; import cn.xhf.dao.impl.BooksDaoImpl; public class TestBooks { public static void main(String[] args) { BooksDao booksDao = new BooksDaoImpl(); List<Books> list = booksDao.findAll(); System.out.println(list.size()); } } ``` 报错信息: Exception in thread "main" java.lang.NullPointerException at cn.xhf.dao.impl.BooksDaoImpl.findAll(BooksDaoImpl.java:32) at cn.xhf.pojo.TestBooks.main(TestBooks.java:11)

基于java注解配置 mybatis的时候,mapper无法注入spring容器,怎么解决?

配置代码如下: ``` @Bean(name = "sqlSessionFactory") public SqlSessionFactory sqlSessionFactory() throws Exception { logger.info("SqlSession配置...."); SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean(); factoryBean.setDataSource(basicDataSource()); factoryBean.setMapperLocations(context.getResources("classpath*:config/mappers/*.xml")); // factoryBean.setTypeAliasesPackage("com.hengqinlife.EcPlatform.dao.modules.**.entity"); // Interceptor[] plugins = new Interceptor[10]; // PageHelper page = new PageHelper(); // Properties properties = new Properties(); // properties.setProperty("dialect", "mysql"); // page.setProperties(properties); // plugins[0] = page; // factoryBean.setPlugins(plugins); return factoryBean.getObject(); } @Bean public static MapperScannerConfigurer getMapperScannerConfigurer(){ MapperScannerConfigurer config = new MapperScannerConfigurer(); config.setBasePackage("com.hengqinlife.EcPlatform.dao.modules.**.mapper"); config.setSqlSessionFactoryBeanName("sqlSessionFactory"); return config; } ``` ![图片说明](https://img-ask.csdn.net/upload/201703/01/1488334217_181219.png)

ssm项目springmvc中加入websocke后mybatis不能注入mapper

spring——mybatis文件 ``` <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="${jdbc.driverClassName}" /> <property name="jdbcUrl" value="${jdbc.url}" /> <property name="user" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> <property name="autoCommitOnClose" value="true"/> <!-- property name="checkoutTimeout" value="${cpool.checkoutTimeout}"/ --> <property name="initialPoolSize" value="${cpool.initialPoolSize}"/> <property name="minPoolSize" value="${cpool.minPoolSize}"/> <property name="maxPoolSize" value="${cpool.maxPoolSize}"/> <property name="maxIdleTime" value="${cpool.maxIdleTime}"/> <property name="acquireIncrement" value="${cpool.acquireIncrement}"/> <property name="idleConnectionTestPeriod" value="${cpool.idleConnectionTestPeriod}"/> <property name="acquireRetryAttempts" value="${cpool.acquireRetryAttempts}"/> <property name="maxStatements" value="${c3p0.maxStatements}"/> <property name="maxStatementsPerConnection" value="${c3p0.maxStatementsPerConnection}"/> </bean> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <!-- mapper和resultmap配置路径 --> <property name="mapperLocations"> <list> <value>classpath:com/yuan/*/entity/*.mapper.xml</value> </list> </property> </bean> <!-- 设置扫描根路径也就是你的mybatis的mapper接口所在包路径; 凡是markerInterface这个接口的子接口都参与到这个扫描, 也就是说所有的mapper接口继承这个SqlMapper。--> <bean name="SqlMapper" class="com.yuan.framework.mapper.SqlMapper"> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.yuan.*.mapper"/> <property name="markerInterface" ref="SqlMapper" /> </bean> <!-- TransactionManager 事务管理 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <!--启动spring事务注解功能--> <tx:annotation-driven transaction-manager="transactionManager" /> ``` springmvc文件 ``` <mvc:annotation-driven/> <!-- <mvc:resources location="/" mapping="/**"/> --> <!-- 自动扫描controller包下的所有类,使其认为spring mvc的控制器 --> <context:component-scan base-package="com.yuan.*.controller" /> <bean id="myHandler" class="com.yuan.framework.websocket.WebsocketEndPoint"></bean> <websocket:handlers> <websocket:mapping path="/myHandler" handler="myHandler"/> <websocket:handshake-interceptors> <bean class="com.yuan.framework.websocket.HandshakeInterceptor"/> </websocket:handshake-interceptors> </websocket:handlers> <!-- <websocket:handlers > <websocket:mapping path="/sockjs/myHandler" handler="myHandler"/> <websocket:sockjs/> </websocket:handlers> --> <!-- 避免IE执行AJAX时,返回JSON出现下载文件 --> <bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"> <property name="supportedMediaTypes"> <list> <value>text/html;charset=UTF-8</value> </list> </property> </bean> <!-- 启动Spring MVC的注解功能,完成请求和注解POJO的映射 --> <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> <property name="messageConverters"> <list> <ref bean="mappingJacksonHttpMessageConverter" /><!-- json转换器 --> </list> </property> <!-- 日期格式转换 --> <property name="webBindingInitializer"> <bean class="com.yuan.framework.util.DateConverter"/> </property> </bean> <!-- 对模型视图名称的解析,即在模型视图名称添加前后缀 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/" p:suffix=".jsp" /> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="defaultEncoding"> <value>UTF-8</value> </property> <property name="maxUploadSize"> <value>32505856</value><!-- 上传文件大小限制为31M,31*1024*1024 --> </property> <property name="maxInMemorySize"> <value>4096</value> </property> </bean> ```

spring整合mybatis 注入出错 求助各位大神

![目录结构](https://img-ask.csdn.net/upload/201704/13/1492074562_72832.png) 报错 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cn.jscoin.UserTest': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private cn.jscoin.jslj.mapper.UserMapper cn.jscoin.UserTest.userMapper; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [cn.jscoin.jslj.mapper.UserMapper] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1202) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireBeanProperties(AbstractAutowireCapableBeanFactory.java:385) at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:118) at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83) at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:212) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:200) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:252) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:254) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:217) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:83) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:68) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:163) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192) Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private cn.jscoin.jslj.mapper.UserMapper cn.jscoin.UserTest.userMapper; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [cn.jscoin.jslj.mapper.UserMapper] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:558) at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331) ... 26 more Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [cn.jscoin.jslj.mapper.UserMapper] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1308) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1054) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:949) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:530) ... 28 more 测试代码 ``` @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations="classpath*:applicationContext.xml") public class UserTest { @Autowired private UserMapper userMapper; @Test public void testAdd(){ User user = new User(); user.setAge(123); userMapper.add(user); } } ``` ![配置文件位置](https://img-ask.csdn.net/upload/201704/13/1492074774_341390.png) applicationContext.xml <!-- 扫描包 --> <context:component-scan base-package="cn.jscoin" /> <!-- 数据源 druid --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"> <property name="driverClassName" value="${driverClassName}" /> <property name="url" value="${url}" /> <property name="username" value="${username}" /> <property name="password" value="${password}" /> </bean> <!-- 读取Property --> <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="locations"> <set> <value>classpath:jdbc.properties</value> </set> </property> </bean> <!-- Mybatis工厂 --> <bean class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 数据源 --> <property name="dataSource" ref="dataSource" /> <!-- 配置Mybati的核心配置文件 --> <property name="configLocation" value="classpath:mybatis-config.xml" /> </bean> <!-- 扫描基本包 Mapper 接口 Mapper文件 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="cn.jscoin.jslj.mapper" /> </bean> <!-- 事务 @Transactional --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <!-- 开启注解的事务 --> <tx:annotation-driven transaction-manager="transactionManager" />

Mybatis 整合spring使用自动扫描包的方式来注册各种Mapper 出现问题,求教

如果采用 <!-- 注册Mapper方式二:也可不指定特定mapper,而使用自动扫描包的方式来注册各种Mapper ,配置如下:--> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="org.hyn.maper" /> </bean> 其中有org.hyn.maper.UserMapper 那么<bean id="userService" class="org.hyn.service.UserServiceImpl"> <property name="userMapper" ref="userMapper" /> </bean> 这个<property name="userMapper" ref="userMapper" />如何能够找到 ,小白求教

mybatis已经添加了@Mapper注解,为什么测试的时候报空指针?

这个类在com.lb.springcloud.dao层下,并且添加了@Mapper ![图片说明](https://img-ask.csdn.net/upload/201909/12/1568283016_874724.png) 这是对应的xml文件 ![图片说明](https://img-ask.csdn.net/upload/201909/12/1568283096_290663.png) 测试代码如下 ![图片说明](https://img-ask.csdn.net/upload/201909/12/1568283137_724691.png) 报错 ![图片说明](https://img-ask.csdn.net/upload/201909/12/1568283155_676625.png) 真的是莫名其妙啊,求各路大神看看

Sping Boot注入接口失败

![图片说明](https://img-ask.csdn.net/upload/201804/21/1524291637_361310.png) 项目结构应该是正确的。 ``` @Repository public interface UserDao { public User getById(int id); } ``` Dao层的代码,使用接口。 @Service ``` @Service public class UserService { @Autowired UserDao userDao; public User getById(int id) { return userDao.getById(id); } } ``` service层代码。 controller层注入service。 启动spring boot后会提示dao层没有扫描到,如果@ComponentScan dao层的话,会提示service层注入失败,求解。

SpringBoot中Mapper如果在BaseService里面注入会有什么问题吗?

我们的Service层都会集成一个BaseService. 今天有几个相同的Service用到了同一个Mapper, 我一直以来都是在每个Service中注入一个私有的Mapper. 但是其实在BaseService里面注入一个public的Mapper给Service继承不也能直接用吗? 这样会有什么风险吗?

IDEA做SSM框架整合时,出现无法加载mapper,导致无法注入。

今日学习SSM框架整合,整合以后,单独用测试类可以连接成功连接数据库,可是一加入MVC用TOMCAT启动,项目就会报错,错误内容为:Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} 以下为项目各部分截图,有没有大佬帮我分析下,问题到底出在哪? ========================================================================================================================================== ![项目报错详细情况](https://img-ask.csdn.net/upload/201908/15/1565880941_652575.png) ## 项目报错详细情况 ![spring配置文件已经配置了mapper.xml路径和齐对应的接口扫描包](https://img-ask.csdn.net/upload/201908/15/1565880955_958792.png) ## spring配置文件已经配置了mapper.xml路径和齐对应的接口扫描包 ![编译文件夹target里已经编译出了mapper相关配置文件及接口类](https://img-ask.csdn.net/upload/201908/15/1565881099_526884.png) ## 编译文件夹target里已经编译出了mapper相关配置文件及接口类 ![mapper.xml里的namespace已经指明了接口路径](https://img-ask.csdn.net/upload/201908/15/1565881139_161198.png) ## mapper.xml里的namespace已经指明了接口路径 ![pom文件里也配置了resource源](https://img-ask.csdn.net/upload/201908/15/1565881159_416309.png) ## pom文件里也配置了resource源 ========================================================================================================================================== # 详细代码已经贴在下方,只选了几个配置文件及mapper接口类,service及controller应该没关系就没传! ============================================= # mybatis-config.xml ``` <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <!--添加缓存 引入第三方二级缓存 --> <settings> <setting name="mapUnderscoreToCamelCase" value="true"/> <setting name="cacheEnabled" value="false"/> </settings> <!-- 配置数据源 default默认使用的数据源 --> <environments default="mysql"> <environment id="mysql"> <transactionManager type="JDBC" /> <dataSource type="POOLED"> <property name="driverClassName" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql:///orderuser"/> <property name="username" value="zhijia3278"/> <property name="password" value="0528"/> </dataSource> </environment> </environments> <!-- 映射文件 --> <mappers> <mapper resource="OrderUserMapper.xml"/> </mappers> </configuration> ``` # OrderUserMapper.java ``` package cn.tedu.mapper; import cn.tedu.domain.Order; import cn.tedu.domain.User; public interface OrderUserMapper { public User queryUser(String userId); public Order queryOrder(String orderId); public void updateUserPoints(User user); } ``` # OrderUserMapper.xml ``` <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="cn.tedu.mapper.OrderUserMapper"> <select id="queryUser" parameterType="String" resultType="User"> select * from t_user where user_id=#{userId} </select> <select id="queryOrder" parameterType="String" resultType="Order"> select * from t_order where order_id=#{orderId} </select> <update id="updateUserPoints" parameterType="User"> update t_user set points=#{points} where user_id=#{userId} </update> </mapper> ``` # spring.xml ``` <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:p="http://www.springframework.org/schema/p" xmlns:util="http://www.springframework.org/schema/util" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!-- 配置内容 --> <context:component-scan base-package="cn.tedu"> </context:component-scan> <context:annotation-config></context:annotation-config> <!-- 持久层数据源 --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"> <!-- 4个属性 --> <property name="driverClassName" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql:///orderuser"/> <property name="username" value="zhijia3278"/> <property name="password" value="0528"/> </bean> <!-- sqlSession --> <bean id="sqlSession" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 数据源注入 --> <property name="dataSource" ref="dataSource"/> <!-- 扫描mybatis的独立配置文件 关闭二级缓存,驼峰命名 --> <property name="configLocation" value="classpath:mybatis/mybatis-config.xml"/> <!-- 映射文件扫描 --> <property name="mapperLocations" value="classpath:mapper/OrderUserMapper.xml" /> <!-- 别名包 --> <property name="typeAliasesPackage" value="cn.tedu.domain"></property> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!-- 扫描的接口包 cn.tedu.mapper --> <property name="basePackage" value="cn.tedu.mapper"/> </bean> <!-- 注解驱动开启,@RequestMapping @RequestParam等 --> <mvc:annotation-driven/> <!-- 防止静态文件js css html访问被dispacherServlet拦截 --> <!-- localhost静态文件根目录 /static /js /css --> <!-- mapping 满足什么样子的访问地址 http://localhost:8080/js//1.js --> <mvc:resources location="/" mapping="/**"></mvc:resources> </beans> ``` # springmvc-servlet ``` <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:p="http://www.springframework.org/schema/p" xmlns:util="http://www.springframework.org/schema/util" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!-- 配置内容 --> <context:component-scan base-package="cn.tedu"/> <!-- 注解驱动开启,@RequestMapping @RequestParam等 --> <mvc:annotation-driven/> <!-- 防止静态文件js css html访问被dispacherServlet拦截 --> <!-- localhost静态文件根目录 /static /js /css --> <!-- mapping 满足什么样子的访问地址 http://localhost:8080/js//1.js --> <mvc:resources location="/" mapping="/**"></mvc:resources> </beans> ``` # web.xml ``` <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd" > <web-app> <display-name>Archetype Created Web Application</display-name> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!-- tomcat启动加载spring.xml --> <!-- <init-param>--> <!-- <param-name>contextConfigLocation</param-name>--> <!-- <param-value>classpath:springmvc/springmvc-servlet.xml</param-value>--> <!-- </init-param>--> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app> ``` # pom.xml ``` <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>cn.tedu</groupId> <artifactId>SSMDemo</artifactId> <version>1.0-SNAPSHOT</version> <packaging>war</packaging> <name>SSM-DEMO01 Maven Webapp</name> <url>http://maven.apache.org</url> <dependencies> <!-- <dependency>--> <!-- <groupId>junit</groupId>--> <!-- <artifactId>junit</artifactId>--> <!-- <version>4.12</version>--> <!-- <scope>compile</scope>--> <!-- </dependency>--> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.3.13.RELEASE</version> </dependency> <!-- datasource --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.0.14</version> </dependency> <!-- spring mysql --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.3.13.RELEASE</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.0.8</version> </dependency> <!-- mybatis --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.5</version> </dependency> <!-- spring mybatis --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.1</version> </dependency> <!-- springmvc --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>4.3.13.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.3.13.RELEASE</version> </dependency> <!-- jackson --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.8.8</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.8.8</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.8.8</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> <scope>provided</scope> </dependency> </dependencies> <build> <finalName>SSM-DEMO01</finalName> <plugins> <plugin> <groupId>org.apache.tomcat.maven</groupId> <artifactId>tomcat7-maven-plugin</artifactId> <version>2.2</version> <!-- 插件属性配置 --> <configuration> <!-- 端口 --> <port>8080</port> <!-- 项目访问路径 --> <path>/</path> <!-- 编解码 --> <uriEncoding>utf-8</uriEncoding> <useBodyEncodingForURI>true</useBodyEncodingForURI> </configuration> </plugin> </plugins> <resources> <resource> <directory>resource</directory> <includes> <include>**/*.xml</include> <include>mapper/*.xml</include> <include>mybatis/*.xml</include> <include>spring/*.xml</include> </includes> <!-- <filtering>true</filtering>--> </resource> </resources> </build> </project> ```

Spring boot 集成mybatisplus basemapper 注入失败

报错信息如下 ``` org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userServiceImpl': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userMapper' defined in file [D:\boot_Video_Barrage\target\classes\com\video\barrage\mapper\UserMapper.class]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Property 'sqlSessionFactory' or 'sqlSessionTemplate' are required at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessProperties(CommonAnnotationBeanPostProcessor.java:337) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1429) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE] at com.video.barrage.MainApplication.main(MainApplication.java:13) ~[classes/:na] Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userMapper' defined in file [D:\boot_Video_Barrage\target\classes\com\video\barrage\mapper\UserMapper.class]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Property 'sqlSessionFactory' or 'sqlSessionTemplate' are required at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1803) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:207) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeanByName(AbstractAutowireCapableBeanFactory.java:454) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:543) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:513) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:653) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:224) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:116) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessProperties(CommonAnnotationBeanPostProcessor.java:334) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE] ... 17 common frames omitted Caused by: java.lang.IllegalArgumentException: Property 'sqlSessionFactory' or 'sqlSessionTemplate' are required at org.springframework.util.Assert.notNull(Assert.java:198) ~[spring-core-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.mybatis.spring.support.SqlSessionDaoSupport.checkDaoConfig(SqlSessionDaoSupport.java:122) ~[mybatis-spring-2.0.2.jar:2.0.2] at org.mybatis.spring.mapper.MapperFactoryBean.checkDaoConfig(MapperFactoryBean.java:73) ~[mybatis-spring-2.0.2.jar:2.0.2] at org.springframework.dao.support.DaoSupport.afterPropertiesSet(DaoSupport.java:44) ~[spring-tx-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1862) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1799) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] ... 30 common frames omitted Disconnected from the target VM, address: '127.0.0.1:50473', transport: 'socket' Process finished with exit code 1 ``` @MapperScan @Mapper 都加了 但还是不管用 求大佬解决

关于springmvc+mybatis 注入问题

service: ``` package com.yhq.service.biz; import com.yhq.service.po.User; public interface UserBiz { void insert(User u); } ``` impl: ``` package com.yhq.service.impl; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.yhq.service.api.UserMapper; import com.yhq.service.biz.UserBiz; import com.yhq.service.po.User; @Service public class UserBizImpl implements UserBiz { @Autowired private UserMapper userMapper; public void insert(User u) { // TODO Auto-generated method stub userMapper.insert(u); } } ``` database.xml ``` <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"> <aop:aspectj-autoproxy/> <!-- 数据源配置,使用应用内的DBCP数据库连接池 --> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName"><value>${jdbc.driverClassName}</value></property> <property name="url"><value>${jdbc.url}</value></property> <property name="username"><value>${jdbc.username}</value></property> <property name="password"><value>${jdbc.password}</value></property> <property name="maxActive"><value>${jdbc.maxActive}</value></property> <property name="maxWait"><value>${jdbc.maxWait}</value></property> <property name="maxIdle"><value>${jdbc.maxIdle}</value></property> <property name="initialSize"><value>${jdbc.initSize}</value></property> <property name="removeAbandoned"><value>true</value></property> <property name="testWhileIdle"><value>true</value></property> <property name="testOnBorrow"><value>false</value></property> <property name="validationQuery"><value>SELECT 1</value></property> </bean> <!-- Transaction manager for a single JDBC DataSource --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="configLocation" value="classpath:sqlmap-config.xml" /> <property name="mapperLocations"> <value>classpath*:com/yhq/service/map/*Mapper.xml</value> </property> </bean> <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate" scope="prototype"> <constructor-arg index="0" ref="sqlSessionFactory" /> </bean> <!-- 连接事务的注解配置 --> <tx:annotation-driven transaction-manager="transactionManager" /> <bean id="txInterceptor" class="org.springframework.transaction.interceptor.TransactionInterceptor"> <property name="transactionManager"> <ref bean="transactionManager"/> </property> <property name="transactionAttributes"> <props> <prop key="insert*">PROPAGATION_REQUIRED,-Exception</prop> <prop key="save*">PROPAGATION_REQUIRED,-Exception</prop> <prop key="delete*">PROPAGATION_REQUIRED,-Exception</prop> <prop key="update*">PROPAGATION_REQUIRED,-Exception</prop> <prop key="create*">PROPAGATION_REQUIRED,-Exception</prop> <prop key="*">PROPAGATION_REQUIRED,readOnly</prop> </props> </property> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="sqlSessionTemplateBeanName" value="sqlSession"/> <property name="basePackage"> <value> com.yhq.service.api </value> </property> </bean> <bean id="aspectJExpressionPointcutAdvisor" class="org.springframework.aop.aspectj.AspectJExpressionPointcutAdvisor"> <property name="advice"> <ref bean="txInterceptor" /> </property> <property name="expression"> <value><![CDATA[execution(* com.yhq..*.*BizImpl.*(..)) && @within(org.springframework.stereotype.Service) && (execution(* create*(..)) || execution(* delete*(..)) || execution(* update*(..)) || execution(* save*(..)))]]></value> </property> </bean> </beans> ``` spring.xml ``` <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"> <mvc:annotation-driven/> <context:component-scan base-package="com.yhq"> </context:component-scan> <bean id="viewResolver" class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver"> <property name="order" value="0" /> <property name="cache" value="true" /> <property name="prefix" value=""/> <property name="suffix" value=".html"/> <property name="viewClass" value="org.springframework.web.servlet.view.freemarker.FreeMarkerView" /> <property name="exposeSpringMacroHelpers" value="true" /> <property name="exposeRequestAttributes" value="true" /> <property name="exposeSessionAttributes" value="true" /> <property name="requestContextAttribute" value="rc" /> <property name="contentType" value="text/html;charset=UTF-8" /> </bean> <bean id="freemarkerConfig" class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer"> <property name="templateLoaderPath" value="/WEB-INF/pages/" /> <property name="defaultEncoding" value="UTF-8" /> <property name="freemarkerSettings"> <props> <prop key="template_update_delay">0</prop> <prop key="locale">zh_CN</prop> <prop key="default_encoding">UTF-8</prop> <prop key="number_format">0.##########</prop> <prop key="datetime_format">yyyy-MM-dd HH:mm:ss</prop> <prop key="classic_compatible">true</prop> <prop key="template_exception_handler">ignore</prop> </props> </property> </bean> </beans> ```

如果能重来,我不会选择北漂——初见北京

一个人走的路

技术大佬:我去,你写的 switch 语句也太老土了吧

昨天早上通过远程的方式 review 了两名新来同事的代码,大部分代码都写得很漂亮,严谨的同时注释也很到位,这令我非常满意。但当我看到他们当中有一个人写的 switch 语句时,还是忍不住破口大骂:“我擦,小王,你丫写的 switch 语句也太老土了吧!” 来看看小王写的代码吧,看完不要骂我装逼啊。 private static String createPlayer(PlayerTypes p...

副业收入是我做程序媛的3倍,工作外的B面人生是怎样的?

提到“程序员”,多数人脑海里首先想到的大约是:为人木讷、薪水超高、工作枯燥…… 然而,当离开工作岗位,撕去层层标签,脱下“程序员”这身外套,有的人生动又有趣,马上展现出了完全不同的A/B面人生! 不论是简单的爱好,还是正经的副业,他们都干得同样出色。偶尔,还能和程序员的特质结合,产生奇妙的“化学反应”。 @Charlotte:平日素颜示人,周末美妆博主 大家都以为程序媛也个个不修边幅,但我们也许...

我说我不会算法,阿里把我挂了。

不说了,字节跳动也反手把我挂了。

2020年大厂Java面试前复习的正确姿势(800+面试题答案解析)

前言 个人觉得面试也像是一场全新的征程,失败和胜利都是平常之事。所以,劝各位不要因为面试失败而灰心、 丧失斗志。也不要因为面试通过而沾沾自喜,等待你的将是更美好的未来,继续加油! 本篇分享的面试题内容包括:Java、MyBatis、ZooKeeper、Dubbo、Elasticsearch、Redis、MySQL、Spring、SpringBoot、SpringCloud、RabbitMQ...

抖音上很火的时钟效果

反正,我的抖音没人看,别人都有几十万个赞什么的。 发到CSDN上来,大家交流下~ 主要用到原生态的 JS+CSS3。 具体不解释了,看注释: &lt;!DOCTYPE html&gt; &lt;html lang="en"&gt; &lt;head&gt; &lt;meta charset="UTF-8"&gt; &lt;title&gt;Title&lt;/tit...

记录下入职中软一个月(外包华为)

我在年前从上一家公司离职,没想到过年期间疫情爆发,我也被困在家里,在家呆着的日子让人很焦躁,于是我疯狂的投简历,看面试题,希望可以进大公司去看看。 我也有幸面试了我觉得还挺大的公司的(虽然不是bat之类的大厂,但是作为一名二本计算机专业刚毕业的大学生bat那些大厂我连投简历的勇气都没有),最后选择了中软,我知道这是一家外包公司,待遇各方面甚至不如我的上一家公司,但是对我而言这可是外包华为,能...

又出事了?网站被攻击了?高中生?

北京时间2020年3月27日9点整,如往常一样来到公司,带开电脑,正准备打开Github网站看一会源代码,再开始手头的工作。哟吼,一直打不开,一直出现如下页面: 我想很多网友也尝到了甜头,各大技术群炸开了锅,据网友反馈有攻击者正在发起大规模的中间人挟持,京东和Github等网站等网站都受到了影响。 什么是中间中间人挟持呢? 简而言之,就是攻击者在数据网络传输的过程中,截获传输过程中的数据并篡改...

培训班出来的人后来都怎么样了?(二)

接着上回说,培训班学习生涯结束了。后面每天就是无休止的背面试题,不是没有头脑的背,培训公司还是有方法的,现在回想当时背的面试题好像都用上了,也被问到了。回头找找面试题,当时都是打印下来天天看,天天背。 不理解呢也要背,面试造飞机,上班拧螺丝。班里的同学开始四处投简历面试了,很快就有面试成功的,刚开始一个,然后越来越多。不知道是什么原因,尝到胜利果实的童鞋,不满足于自己通过的公司,嫌薪水要少了,选择...

面试了一个 31 岁程序员,让我有所触动,30岁以上的程序员该何去何从?

最近面试了一个31岁8年经验的程序猿,让我有点感慨,大龄程序猿该何去何从。

大三实习生,字节跳动面经分享,已拿Offer

说实话,自己的算法,我一个不会,太难了吧

程序员垃圾简历长什么样?

已经连续五年参加大厂校招、社招的技术面试工作,简历看的不下于万份 这篇文章会用实例告诉你,什么是差的程序员简历! 疫情快要结束了,各个公司也都开始春招了,作为即将红遍大江南北的新晋UP主,那当然要为小伙伴们做点事(手动狗头)。 就在公众号里公开征简历,义务帮大家看,并一一点评。《启舰:春招在即,义务帮大家看看简历吧》 一石激起千层浪,三天收到两百多封简历。 花光了两个星期的所有空闲时...

工作八年,月薪60K,裸辞两个月,投简历投到怀疑人生!

近日,有网友在某职场社交平台吐槽,自己裸辞两个月了,但是找工作却让自己的心态都要崩溃了,全部无果,不是已查看无回音,就是已查看不符合。 “工作八年,两年一跳,裸辞两个月了,之前月薪60K,最近找工作找的心态崩了!所有招聘工具都用了,全部无果,不是已查看无回音,就是已查看不符合。进头条,滴滴之类的大厂很难吗???!!!投简历投的开始怀疑人生了!希望 可以收到大厂offer” 先来看看网...

我把华为小米年报放一起,发现华为才是真·手机公司,小米确实不靠卖手机赚钱...

郭一璞 发自 凹非寺量子位 报道 | 公众号 QbitAI国产手机界的两大玩家,华为&amp;小米,昨天在同一天前后脚发布了2019年财报。同行冤家,发财报也碰在了同一天。那我们就对比...

大牛都会用的IDEA调试技巧!!!

导读 前天面试了一个985高校的实习生,问了他平时用什么开发工具,他想也没想的说IDEA,于是我抛砖引玉的问了一下IDEA的调试用过吧,你说说怎么设置断点...

97年世界黑客编程大赛冠军作品(大小仅为16KB),惊艳世界的编程巨作

这是世界编程大赛第一名作品(97年Mekka ’97 4K Intro比赛)汇编语言所写。 整个文件只有4095个字节, 大小仅仅为16KB! 不仅实现了3D动画的效果!还有一段震撼人心的背景音乐!!! 内容无法以言语形容,实在太强大! 下面是代码,具体操作看最后! @echo off more +1 %~s0|debug e100 33 f6 bf 0 20 b5 10 f3 a5...

不要再到处使用 === 了

我们知道现在的开发人员都使用 === 来代替 ==,为什么呢?我在网上看到的大多数教程都认为,要预测 JavaScript 强制转换是如何工作这太复杂了,因此建议总是使用===。这些都...

什么是a站、b站、c站、d站、e站、f站、g站、h站、i站、j站、k站、l站、m站、n站?00后的世界我不懂!

A站 AcFun弹幕视频网,简称“A站”,成立于2007年6月,取意于Anime Comic Fun,是中国大陆第一家弹幕视频网站。A站以视频为载体,逐步发展出基于原生内容二次创作的完整生态,拥有高质量互动弹幕,是中国弹幕文化的发源地;拥有大量超粘性的用户群体,产生输出了金坷垃、鬼畜全明星、我的滑板鞋、小苹果等大量网络流行文化,也是中国二次元文化的发源地。 B站 全称“哔哩哔哩(bilibili...

十个摸鱼,哦,不对,是炫酷(可以玩一整天)的网站!!!

文章目录前言正文**1、Kaspersky Cyberthreat real-time map****2、Finding Home****3、Silk – Interactive Generative Art****4、Liquid Particles 3D****5、WINDOWS93****6、Staggering Beauty****7、Ostagram图片生成器网址****8、全历史网址*...

终于,月薪过5万了!

来看几个问题想不想月薪超过5万?想不想进入公司架构组?想不想成为项目组的负责人?想不想成为spring的高手,超越99%的对手?那么本文内容是你必须要掌握的。本文主要详解bean的生命...

毕业5年,我熬夜整理出了这50个优质的电子书网站,吐血推荐!

大家好,我是武哥,最近经常有小伙伴问我要电子书,都什么年代了,还找不到电子书吗?如果要说原因,那就是你还没遇到武哥我(手动滑稽~)!我今天把这么多年我经常看的电子书网站整理一下给大家,基本上能解决大家的需求。不管是在校生还是已经工作了,相信肯定对你有所帮助! 1.鸠摩搜书 首先给大家推荐的网站是:鸠摩搜书 地址:https://www.jiumodiary.com/ 这个网上非常棒,上面有很多优质...

MySQL性能优化(五):为什么查询速度这么慢

前期回顾: MySQL性能优化(一):MySQL架构与核心问题 MySQL性能优化(二):选择优化的数据类型 MySQL性能优化(三):深入理解索引的这点事 MySQL性能优化(四):如何高效正确的使用索引 前面章节我们介绍了如何选择优化的数据类型、如何高效的使用索引,这些对于高性能的MySQL来说是必不可少的。但这些还完全不够,还需要合理的设计查询。如果查询写的很糟糕,即使表结构再合理、索引再...

大厂的 404 页面都长啥样?最后一个笑了...

每天浏览各大网站,难免会碰到404页面啊。你注意过404页面么?猿妹搜罗来了下面这些知名网站的404页面,以供大家欣赏,看看哪个网站更有创意: 正在上传…重新上传取消 腾讯 正在上传…重新上传取消 网易 淘宝 百度 新浪微博 正在上传…重新上传取消 新浪 京东 优酷 腾讯视频 搜...

自从喜欢上了B站这12个UP主,我越来越觉得自己是个废柴了!

不怕告诉你,我自从喜欢上了这12个UP主,哔哩哔哩成为了我手机上最耗电的软件,几乎每天都会看,可是吧,看的越多,我就越觉得自己是个废柴,唉,老天不公啊,不信你看看…… 间接性踌躇满志,持续性混吃等死,都是因为你们……但是,自己的学习力在慢慢变强,这是不容忽视的,推荐给你们! 都说B站是个宝,可是有人不会挖啊,没事,今天咱挖好的送你一箩筐,首先啊,我在B站上最喜欢看这个家伙的视频了,为啥 ,咱撇...

代码注释如此沙雕,会玩还是你们程序员!

某站后端代码被“开源”,同时刷遍全网的,还有代码里的那些神注释。 我们这才知道,原来程序员个个都是段子手;这么多年来,我们也走过了他们的无数套路… 首先,产品经理,是永远永远吐槽不完的!网友的评论也非常扎心,说看这些代码就像在阅读程序员的日记,每一页都写满了对产品经理的恨。 然后,也要发出直击灵魂的质问:你是尊贵的付费大会员吗? 这不禁让人想起之前某音乐app的穷逼Vip,果然,穷逼在哪里都是...

总结了Mybatis,原来知识点也没多少嘛

看完这篇Mybatis,感觉你三天就会用了。

爬虫(101)爬点重口味的

小弟最近在学校无聊的很哪,浏览网页突然看到一张图片,都快流鼻血。。。然后小弟冥思苦想,得干一点有趣的事情python 爬虫库安装https://s.taobao.com/api?_ks...

疫情后北上广深租房价格跌了吗? | Alfred数据室

去年3月份我们发布了《北上广深租房图鉴》(点击阅读),细数了北上广深租房的各种因素对租房价格的影响。一年过去了,在面临新冠疫情的后续影响、城市尚未完全恢复正常运转、学校还没开学等情况下...

面试官给我挖坑:a[i][j] 和 a[j][i] 有什么区别?

点击上方“朱小厮的博客”,选择“设为星标”后台回复&#34;1024&#34;领取公众号专属资料本文以一个简单的程序开头——数组赋值:int LEN = 10000; int[][] ...

在拼多多上班,是一种什么样的体验?我心态崩了呀!

之前有很多读者咨询我:武哥,在拼多多上班是一种什么样的体验?由于一直很忙,没抽出时间来和大家分享。上周末特地花点时间来写了一篇文章,跟大家分享一下拼多多的日常。 1. 倒时差的作息 可能很多小伙伴都听说了,拼多多加班很严重。这怎么说呢?作息上确实和其他公司有点区别,大家知道 996,那么自然也就能理解拼多多的“11 11 6”了。 所以当很多小伙伴早上出门时,他们是这样的: 我们是这样的: 当...

相关热词 c# cad插入影像 c#设计思想 c#正则表达式 转换 c#form复制 c#写web c# 柱形图 c# wcf 服务库 c#应用程序管理器 c#数组如何赋值给数组 c#序列化应用目的博客园
立即提问