第一步：首先找到RedisAutoConfiguration类这里会有个

ConditionalOnMissingBean，也就是说当有自定义的redisTemplate时可以加载自定义的template

第二步：创建一个RedisAutoConfiguration配置类，添加如下代码可完成json序列化操作

package com.ccsu.spring_redis.Config;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.jsontype.impl.LaissezFaireSubTypeValidator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

@Configuration
public class RedisAutoConfiguration {
    @Bean(name = "redisTemplate")
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate<String, Object> template = new RedisTemplate();
        template.setConnectionFactory(redisConnectionFactory);
        //json序列化配置
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        //取objectmapper做转译器
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.activateDefaultTyping(LaissezFaireSubTypeValidator.instance, ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);
        //string序列化配置
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        //key采用string序列化配制
        template.setKeySerializer(stringRedisSerializer);
        //hash的key采用string序列化配制
        template.setHashKeySerializer(stringRedisSerializer);
        //value采用jackson序列化
        template.setValueSerializer(jackson2JsonRedisSerializer);
        //hash的value采用jackson序列化配置
        template.setHashValueSerializer(jackson2JsonRedisSerializer);
        return template;
    }
}

第三步：在用这个redis模板时会遇到加载不到，或者加载到老redis模板，只要用@qualifier指定一下即可：

@SpringBootTest
class SpringRedisApplicationTests {

    @Autowired
    @Qualifier("redisTemplate")
    private RedisTemplate redisTemplate;

    @Autowired
    private User user;
    @Test
    void contextLoads() {
        redisTemplate.opsForValue().set("name","xiaomi");
        System.out.println(redisTemplate.opsForValue().get("name"));
    }