applicationContext.xml：
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" 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-4.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd"> <!-- 开启自动扫描自动扫描： 自动扫描所有使用 @Component（其他三个的父类，其他三个能修饰的它也能修饰当然还建议分类）, @Repository（修饰dao）, @Service（修饰service）, @Controller（修饰controller）注解修饰的类 base-package:需要扫描的包名，如果扫描多个包也可以Spring,spring2或者重新搞一行 注意这里也需要用到Context标签所以，用之前要声明它在头部。 --> <context:component-scan base-package="spring"></context:component-scan> </beans>随后我们给dao 跟service上注解： dao:
package spring; import org.springframework.stereotype.Repository; @Repository("userDao")//相当与IUserDao userDao = new UserDaoImpl(); public class UserDaoImpl implements IUserDao { @Override public void selectUser() { System.out.println("UserDaoImpl.selectUser..........11111"); } }service:
package spring; import javax.annotation.Resource; import org.springframework.stereotype.Service; @Service("userService")//相当与：UserService userService = new UserService(); public class UserService { @Resource(name="userDao")//给它传一个需要执行的Dao private IUserDao userDao; private String userName; public void findUsers() { System.out.println("username:" + userName); userDao.selectUser(); } }Test:
package spring; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Test { public static void main(String[] args) { //加载解析applicationContext.xml //积极加载，在加载与解析xml的同时，即完成所有bean的实例化 ClassPathXmlApplicationContext factory=new ClassPathXmlApplicationContext("applicationContext.xml"); System.out.println("IOC容器加载完成"); //获取工厂中的UserService对象 UserService userService=(UserService)factory.getBean("userService"); //调用方法 userService.findUsers(); } }需要导的包有：
