最近做项目，做测试时，无意中遇到了一个问题：分别用BeanFactory和用ApplicationContext的getBean方法获取dataSource，用ApplicationContext获取成功，而用BeanFactory获取则报错
public class DataSourceTest {
public static void main(String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext("resources/spring/applicationContext-hibernate.xml");
DataSource ds = (DataSource) ctx.getBean("dataSource");
System.out.println(ds);
}
}
输出结果：org.springframework.jdbc.datasource.DriverManagerDataSource@1af33d6
public class JdbcTemplateTest {
static String delimiter = File.separator;
static String classpath = "resources"+delimiter+"spring"+delimiter+"applicationContext-hibernate.xml";
public static void main(String[] args) {
BeanFactory factory = new XmlBeanFactory(new ClassPathResource(classpath));
DataSource ds = (DataSource) factory.getBean("dataSource");
/**
* 以上方法获得DataSource的Bean会报错：说找不到数据库的驱动类
*
* */
System.out.println(ds);
}
}
运行报错：
Error creating bean with name 'dataSource' defined in class path resource [resources/spring/applicationContext-hibernate.xml]:
Error setting property values; nested exception is org.springframework.beans.PropertyBatchUpdateException;
nested PropertyAccessExceptions (1) are:
PropertyAccessException 1: org.springframework.beans.MethodInvocationException: Property 'driverClassName' threw exception;
nested exception is org.springframework.jdbc.CannotGetJdbcConnectionException: Could not load JDBC driver class [${jdbc.driverClassName}]; nested exception is java.lang.ClassNotFoundException: ${jdbc.driverClassName}
我的配置文件位置如下所示：
resouces包-----
|
|
config子包:放数据库配置信息：jdbc.properties文件
spring子包：放spring的配置文件：applicationContext.xml
两个文件的内容如下：
jdbc.properties文件内容：
jdbc.driverClassName=oracle.jdbc.driver.OracleDriver
jdbc.url=jdbc:oracle:thin:@localhost:1521:LOCALDEV
jdbc.username=ccic
jdbc.password=ccic
<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"
default-autowire="byName">
<!-- 属性文件读入 -->
<bean id="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:resources/config/jdbc.properties</value>
</list>
</property>
</bean>
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${jdbc.driverClassName}"/>
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
</bean>
</beans>
问题：同样是读取同一个配置文件，Spring的BeanFactory与ApplicationContext的getBean方法有什么区别?为什么一个行一个不行呢？
我只知道它们两个在延迟加载方面有区别：BeanFactory的getBean是延迟加载，ApplicationContext的getBean是在容器启动时就创建
