Spring学习-02-基于XML配置文件的依赖注入

pom.xml

  4.0.0
  com.monkey1024
  02_spring
  0.0.1-SNAPSHOT
  war
  
  	UTF-8
  
  
  		
		    org.springframework
		    spring-context
		    5.0.4.RELEASE
		
		
			junit
			junit
			3.8.1
			test
		
	
	
		02_spring
		
			
			
				org.apache.maven.plugins
				maven-compiler-plugin
				
					
					1.8
					1.8
					UTF-8
				
			
		
	

applicationContext.xml

UserDao.java

package com.monkey1024.dao;

public interface UserDao {
	void addUser();
}

UserDaoImpl.java

package com.monkey1024.dao.impl;

import com.monkey1024.dao.UserDao;

public class UserDaoImpl implements UserDao{
	public void addUser(){
		System.out.println("添加用户");
	}

}
 

UserService.java

package com.monkey1024.service;

public interface UserService {
	void addUser();
}

UserServiceImpl.java

package com.monkey1024.service.impl;

import com.monkey1024.dao.UserDao;
import com.monkey1024.service.UserService;

public class UserServiceImpl implements UserService {
	private UserDao userDao;
	
	//通过set方法进行注入
//	public UserDao getUserDao(){
//		return userDao;
//	}
//	public void setUserDao(UserDao userDao){
//		this.userDao = userDao;
//	}
	
	//通过构造方法进行注入
	public UserServiceImpl(UserDao userDao){
		this.userDao = userDao;
	}
	
	public void addUser(){
		//以前需要手动创建对象
		//userDao = new UserDaoImpl();
		userDao.addUser();
	}
	
}

Test01.java

package com.monkey1024.test;

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

import com.monkey1024.service.UserService;

public class Test01 {
	
	@Test
	public void testDI(){
		ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
		UserService userService = (UserService) context.getBean("userService");
		userService.addUser();
	}
}