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);
    }
}