Spring的IOC的註解:類的屬性的注入

UserDao.java

package com.cherry.spring.demo1;

public interface UserDao {
	public void save();
}

UserDaoImpl.java

package com.cherry.spring.demo1;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;

/**
 * 用戶DAO的實現類
 * @author zhang
 *
 */
//@Component("userDao")//相當於<bean id="userDao" class="com.cherry.spring.demo1.UserDaoImpl"/>
@Repository("userDao")
public class UserDaoImpl implements UserDao {
	
	@Value("屬性")
	private String name;
	
	/*@Value("feng")
	public void setName(String name) {
		this.name = name;
	}*/



	@Override
	public void save() {
		System.out.println("UserDaoImpl的save執行了.."+name);
	}

}

UserService.java

package com.cherry.spring.demo1;

public interface UserService {
	public void save();
}

UserServiceImpl.java

package com.cherry.spring.demo1;

import javax.annotation.Resource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

@Service("userService")
public class UserServiceImpl implements UserService {

	//注入Dao
	@Autowired//按類型註解
//	@Qualifier("userDao")//兩個一起使用：強制按名稱註解
	@Resource(name="userDao")//按名稱註解
	private UserDao userDao; 
	
	@Override
	public void save() {
		System.out.println("UserServiceImpl的save方法執行了..");
		userDao.save();
		
	}

}

applicationContext.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.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- Spring的IOC的註解的入門 -->
    <!-- 使用IOC的註解開發，配置掃描(哪些包下的類使用IOC的註解) -->
    <context:component-scan base-package="com.cherry.spring.demo1"/>
    
</beans>

測試類

package com.cherry.spring.demo1;

import org.junit.jupiter.api.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * Spring的IOC的註解開發的測試類
 * @author zhang
 *
 */
public class SpringDemo1 {
	
	@Test
	//傳統方式
	public void demo1() {
		UserDaoImpl userDao=new UserDaoImpl();
//		userDao.setName("zhang");
		userDao.save();
	}
	
	@Test
	//Spring的IOC的註解方式
	public void demo2() {
		ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
		UserDao userDao = (UserDao) applicationContext.getBean("userDao");
		userDao.save();
	}
	
	@Test
	//Spring的IOC的註解方式
	public void demo3() {
		ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
		UserService userService = (UserService) applicationContext.getBean("userService");
		userService.save();
	}
}