springboot中如何向redis缓存中存入数据

package com.hope;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.hope.domain.User;
import com.hope.repository.UserRepository;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.List;

/**
 * @author newcityman
 * @date 2020/1/19 - 23:20
 */
@RunWith(SpringRunner.class)
@SpringBootTest(classes = SpringbootJpaApplication.class)
public class RedisTest {
 @Autowired
 private RedisTemplate<String, String> redisTemplate;

 @Autowired
 private UserRepository userRepository;
 @Test
 public void test() throws JsonProcessingException {
 //1、从redis中获取数据，数据形式是json
 String userListJson = redisTemplate.boundValueOps("user.findAll").get();
 //2、判断redis中是否存在
 if(null==userListJson){
 //3、如果不存在，从数据库中查询
 List<User> list = userRepository.findAll();
 //4、将查出的数据存放到redis中
 ObjectMapper objectMapper = new ObjectMapper();
 userListJson = objectMapper.writeValueAsString(list);
 redisTemplate.boundValueOps("user.findAll").set(userListJson);

 System.out.println("========从数据库中获取数据存入缓存========");
 }else{
 System.out.println("========从redis缓存中获取数据========");
 }
 //5、将数据在控制台打印
 System.out.println(userListJson);
 }
}