springboot使用junit4进行单元测试方法的时候出现@Autowired注入的对象总为null解决

本文介绍了在SpringBoot项目中使用JUnit4进行单元测试时，遇到@Autowired注解的对象总是为null的问题及解决方案。重点检查pom.xml是否已引入JUnit4依赖，并确保测试方法上添加了正确的注解。

一、注意:pox.xml是否已经进行juint4.12引入依赖。
二、需要注意在测试方法上添加这两个注解：

@RunWith(SpringRunner.class)
@SpringBootTest(classes = Application.class)

package com.niezhiliang.luck.draw;

import com.niezhiliang.luck.draw.test.TestBase;
import com.niezhiliang.luck.draw.utils.RedisListTools;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.*;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.*;


/**
 * @author helloLi
 * @version 1.0
 * @date 2021/6/27 12:22
 */
@RunWith(SpringRunner.class)
@SpringBootTest(classes = Application.class)
public class testMain{


    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private RedisListTools<String> listTools;

    @Test
    public void method5() {
        System.out.println(listTools);
        final String key = "SpringBootRedis:Hash:Key:v1";
        HashOperations<String,String,String> hashOperations=redisTemplate.opsForHash();
        hashOperations.put(key,"10010","zhangsan");
        hashOperations.put(key,"10011","lisi");

        Map<String,String> dataMap= new HashMap<>();
        dataMap.put("10012","wangwu");
        dataMap.put("10013","zhaoliu");
        hashOperations.putAll(key,dataMap);

       hashOperations.entries(key);
//        log.info("---哈希hash-获取10012的元素： {} ",hashOperations.get(key,"10012"));
//        log.info("---哈希hash-获取所有元素的field列表： {} ",hashOperations.keys(key));
//
//        log.info("---哈希hash-10013成员是否存在： {} ",hashOperations.hasKey(key,"10013"));
//        log.info("---哈希hash-10014成员是否存在： {} ",hashOperations.hasKey(key,"10014"));
//
//        hashOperations.putIfAbsent(key,"10020","sunwukong");
//        log.info("---哈希hash-获取列表元素： {} ",hashOperations.entries(key));
//
//        log.info("---哈希hash-删除元素10010 10011： {} ",hashOperations.delete(key,"10010","10011"));
//        log.info("---哈希hash-获取列表元素： {} ",hashOperations.entries(key));
//
//        log.info("---哈希hash-获取列表元素个数： {} ",hashOperations.size(key));
    }
}