Spring integrates Junit tests

package com.hciot.test;
import javax.annotation.Resource;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import com.hciot.bean.Car;
import com.hciot.bean.User;
//help us create the container
@RunWith(SpringJUnit4ClassRunner.class)	
//Specify which configuration file to use when creating the container
@ContextConfiguration("classpath:applicationContext.xml")
public class Demo {
	//Inject an object named user into the u variable
	@Resource(name="user")
	private User u;
	@Test
	public void fun1(){
		System.out.println(u);
	}
}