Spring_1100_IOC_Annotation_Resource_Component

package com.bjsxt.service;
import javax.annotation.Resource;

import org.springframework.stereotype.Component;

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

@Component("userService")
public class UserService {

private UserDAO userDAO; 

public void add(User user) {
userDAO.save(user);
}
public UserDAO getUserDAO() {
return userDAO;
}

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

}

<?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"></context:component-scan>
</beans>


package com.bjsxt.dao.impl;

import org.springframework.stereotype.Component;

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

@Component("u")
public class UserDAOImpl implements UserDAO {

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

}

@Component注解
相当于<bean id = "u" class = "com.bjsxt.dao.impl.UserDAOImpl" />

@Resource(name = "u")
相当于把组件u当做资源注入