两种方法都要用到Junit JAR包

<dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>

方法一：直接在测试类的头部加注解的方式（配合Spring-test）

所加注解为 @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration("classpath:spring/applicationContext.xml")

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import top.flytop.studentsign.pojo.Student;
import top.flytop.studentsign.service.impl.UserServiceImpl;

import javax.annotation.Resource;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:spring/applicationContext.xml")
public class UserTest {
	@Resource
	public UserServiceImpl userServiceImpl;

	@Test
	public void testGetStuInfo() {
		System.out.println(userServiceImpl);
		Student s = userServiceImpl.getStuAllInfo(1);
		System.out.println(s);
	}
}

注意：需要引入Spring-test JAR包

<dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>4.3.18.RELEASE</version>
      <scope>test</scope>
    </dependency>

此处，如果 @ContextConfiguration(）引入的配置文件有多个，可按照如下方式书写（location为该注解默认属性，属性名可省略）：

@ContextConfiguration(locations = { "classpath*:/spring1.xml", "classpath*:/spring2.xml" })

方法二：手动加载Spring容器，以getBean()的方式获取对象。（不需要Spring-test JAR包）

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import top.flytop.studentsign.pojo.Student;
import top.flytop.studentsign.service.impl.UserServiceImpl;

import javax.annotation.Resource;
public class UserTest {
  //创建Spring容器
  ApplicationContext ac = new ClassPathXmlApplicationContext("spring/applicationContext.xml");
  //从Spring容器中获取UserDao对象
  UserServiceImpl  userServiceImpl = ac.getBean("userServiceImpl",UserServiceImpl.class);
  @Test
  public void testGetStuInfo() {
    System.out.println(userServiceImpl);
    Student s = userServiceImpl.getStuAllInfo(1);
    System.out.println(s);
  }
}