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@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: 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
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 }
UserService
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 }
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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