spring中Resource和Component注解

在使用注解的时候，首先得在配置文件bean.xml中添加命名空间：

xmlns:context="http://www.springframework.org/schema/context"

 

然后在xsi:schemaLocation中添加：

http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd

 

再次引入：

<context:component-scan base-package="com.test"></context:component-scan>

 

它会扫描锁配置的包里面那些类注解了Component

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: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:component-scan base-package="com.test"></context:component-scan>
	
</beans>

 

UserDAOImpl.java

package com.test.dao.impl;

import org.springframework.stereotype.Component;

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

@Component("userDAOImpl")
public class UserDAOImpl implements UserDAO {
	public void save(User user) {
		System.out.println("user saved!");
	}
}

 

UserService.java

package com.test.service;

import javax.annotation.Resource;

import org.springframework.stereotype.Component;

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

@Component("userService")
public class UserService {
	private UserDAO userDAO;

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

	public UserDAO getUserDAO() {
		return userDAO;
	}

	// 这里会找注解Component的值为：userDAOImpl的那个类
	@Resource(name="userDAOImpl")
	public void setUserDAO(UserDAO userDAO) {
		this.userDAO = userDAO;
	}

}

 

注：这里Resource注解要加入common-annotations.jar包