----更加简化的版本

UserAction.java

import javax.annotation.Resource;import org.springframework.stereotype.Component;
import org.springframework.stereotype.Controller;//@Component("userAction")  // 加入IOC容器//@Component@Controller  // 控制层的组件
public class UserAction {@Resourceprivate UserService userService;public String execute() {userService.save();return null;}
}

UserService.java

import javax.annotation.Resource;import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;//@Component("userService")  // userService加入ioc容器//@Component@Service   // 表示业务逻辑层的组件
public class UserService {//	@Resource	//  根据类型查找 【在容器中要确保该类型只有一个变量】@Resource(name = "userDao")  // 根据名称查找private UserDao userDao;  // 去容器中招UserDao类型的变量，找到后就赋值public void save() {userDao.save();}
}

UserDao.java

import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;// 把当前对象加入ioc容器
//@Component("userDao")   //  相当于bean.xml 【<bean id=userDao class=".." />】//@Component  // 加入ioc容器的UserDao对象的引用名称， 默认与类名一样， 且第一个字母小写@Repository   // 在持久层可以选择用这个注解
public class UserDao {public UserDao(){System.out.println("UserDao.UserDao()");}public UserDao(int id){System.out.println("UserDao.UserDao(int id)" + id);}public void save() {System.out.println("zengmg:保存用户!!!");}
}

bean.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:p="http://www.springframework.org/schema/p"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsd"><!-- 开启注解扫描 --><context:component-scan base-package="zengmg.e_anno2"></context:component-scan><bean id="userDao" class="zengmg.UserDao" scope="prototype"></bean></beans>   

测试代码：

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class App {// 创建容器对象private ApplicationContext ac = new ClassPathXmlApplicationContext("zengmg/e_anno2/bean.xml");@Testpublic void testExecuteAction() {// 从容器中获取ActionUserAction userAction = (UserAction) ac.getBean("userAction");userAction.execute();}
}