初次配置SpringMVC+myBatis,使用properties来存储数据库的相关数据,并在xml中读取出来,写入dataSource中。
这时发现报错:Cannot load JDBC driver class ${jdbc.driverClassName}
java.lang.ClassNotFoundException: ${driverClass}
按理说没有jar包,应该报错Cannot load JDBC driver class com.mysql.jdbc.Drive
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${driverClass}"/>
<property name="url" value="${jdbcUrl}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
如果像上述这样就会报错,properties文件无误。
如果改成这样:
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/Lettiy"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
便可以正常访问,所以怀疑时properties文件没有正常导入
在xml最开始已经引入了该properties,路径正确,可以通过ctrl直接打开
<context:property-placeholder location="classpath:jdbc.properties"/>
现在贴出全部的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: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.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<context:property-placeholder location="classpath:jdbc.properties"/>
<!-- 扫描注解Bean -->
<context:component-scan base-package="*.service">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<!-- 开启AOP监听 只对当前配置文件有效 -->
<aop:aspectj-autoproxy expose-proxy="true"/>
<!--myBatis 配置-->
<!-- 第一种方式:加载一个properties文件 -->
<!--<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">-->
<!--<property name="location" value="classpath:resource/jdbc.properties"/>-->
<!--</bean>-->
<!-- 配置数据源 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${driverClass}"/>
<property name="url" value="${jdbcUrl}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</bean>
<!-- mybatis和spring完美整合,不需要mybatis的配置映射文件 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="configLocation" value="classpath:mybatis-spring.xml" />
<property name="dataSource" ref="dataSource"/>
<!-- 自动扫描mapping.xml文件 -->
<property name="mapperLocations" value="classpath:datamapper/**/*.xml"></property>
</bean>
<!-- DAO接口所在包名,Spring会自动查找其下的类 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="login.repository"/>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean>
<!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
<tx:annotation-driven transaction-manager="transactionManager"/>
<!--repository 注解扫描-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="annotationClass" value="org.springframework.stereotype.Repository"/>
<property name="basePackage" value="login.repository"/>
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>
</beans>