@Component 注解

@Component
　　a) 初始化的名字默认为类名首字母小写：UserService 在容器中默认为 userService
　　b) 可以指定初始化 bean 的名字:  @Component(value="userService")

xml 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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-2.5.xsd">

  <context:annotation-config />

  <context:component-scan base-package="com.bjsxt" /><!-- 指定包 -->

</beans>

bean 配置：

　　UserDAOImpl

 package com.bjsxt.dao.impl;

 import org.springframework.stereotype.Component;

 import com.bjsxt.dao.UserDAO;
 import com.bjsxt.model.User;

 @Component    //默认名字：userDAOImpl
 public class UserDAOImpl implements UserDAO{

     public void save(User u) {
         System.out.println("a user saved!");
     }

 }

　　UserService

 package com.bjsxt.service;

 import javax.annotation.Resource;

 import org.springframework.stereotype.Component;

 import com.bjsxt.dao.UserDAO;
 import com.bjsxt.model.User;

 @Component(value="userService")
 public class UserService {

     private UserDAO userDAO;

     public void init(){
         System.out.println("init");
     }

     public UserService(){}

     public UserService(UserDAO userDAO){
         super();
         this.userDAO = userDAO;
     }

     public void addUser(User u){
         this.userDAO.save(u);
     }

     public UserDAO getUserDAO() {
         return userDAO;
     }

     @Resource(name="userDAOImpl")
     public void setUserDAO(UserDAO userDAO) {
         this.userDAO = userDAO;
     }

     public void destroy(){
         System.out.println("destroy");
     }

 }

代码链接: http://pan.baidu.com/s/1i4GwEPn 密码: awdu

jar包链接: http://pan.baidu.com/s/1hs655SK 密码: 6h8x