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@Component 注解

2024-09-24 21:07:02   216人阅读

@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: 1 @Component(value="http://www.mamicode.com/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

技术分享
 1 package com.bjsxt.dao.impl; 2  3 import org.springframework.stereotype.Component; 4  5 import com.bjsxt.dao.UserDAO; 6 import com.bjsxt.model.User; 7  8 @Component    //默认名字：userDAOImpl 9 public class UserDAOImpl implements UserDAO{10 11     public void save(User u) {12         System.out.println("a user saved!");13     }14 15 }
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　　UserService

技术分享
 1 package com.bjsxt.service; 2  3 import javax.annotation.Resource; 4  5 import org.springframework.stereotype.Component; 6  7 import com.bjsxt.dao.UserDAO; 8 import com.bjsxt.model.User; 9 10 @Component(value="http://www.mamicode.com/userService")11 public class UserService {12     13     private UserDAO userDAO;14     15     public void init(){16         System.out.println("init");17     }18     19     public UserService(){}20     21     public UserService(UserDAO userDAO){22         super();23         this.userDAO = userDAO;24     }25     26     public void addUser(User u){27         this.userDAO.save(u);28     }29 30     public UserDAO getUserDAO() {31         return userDAO;32     }33 34     @Resource(name="userDAOImpl")35     public void setUserDAO(UserDAO userDAO) {36         this.userDAO = userDAO;37     }38     39     public void destroy(){40         System.out.println("destroy");41     }42     43 }
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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

@Component 注解


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