java RedisTemplate 的使用

springboot 自带的RedisTemplate , 如果我们使用它的默认配置，默认的存储格式是二进制的数据，那么我们在使用工具在看redis中存储的数据时，就看不到，到底存的啥数据

所以我们一般会用 @Configuration 新建一个配置类

对key 使用 StringRedisSerializer 来序列化

对value GenericJackson2JsonRedisSerializer 来序列化

java 复制代码

        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashValueSerializer(new GenericJackson2JsonRedisSerializer());

但是上面的方法，时间的支持，比如 LocalDateTime 等java8新加的时间类型又不行，所以我们要在new GenericJackson2JsonRedisSerializer()的时候，传入一个新的 ObjectMapper 对象

，同时给这个新的 ObjectMapper 对象，添加对LocalDateTime 等类型的支付

java 复制代码

ObjectMapper objectMapper = new ObjectMapper();
        JavaTimeModule javaTimeModule = new JavaTimeModule();
        javaTimeModule.addSerializer(LocalDateTime.class,new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        javaTimeModule.addDeserializer(LocalDateTime.class,new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        objectMapper.registerModule(javaTimeModule);
        objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);

objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS); 这句的意思是告诉 json 对象中的时间不要存成时间戳

所以上面的 setValueSerializer 就成了这样

java 复制代码

        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer(objectMapper));
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashValueSerializer(new GenericJackson2JsonRedisSerializer(objectMapper));

但是这样又有了新的问题，我们传入的 objectMapper, 在json 数据的时候，不会把@class信息写入，这样当我们取到数据后进行强转时，数据只能是默认的 linkedHashMap 的类型，所以我们要让 objectMapper 把数据类型也写入，方便取数据时的操作，所以 objectMapper 还要再加一点配置, 这样就可以在存入json 的时候，带上class 的信息，取数据的时候更方便一点

java 复制代码

       objectMapper.activateDefaultTyping(
                objectMapper.getPolymorphicTypeValidator(),
                ObjectMapper.DefaultTyping.NON_FINAL,
                JsonTypeInfo.As.PROPERTY
        );

最终我们的 configuration RedisTemplateConfig 是这样的

java 复制代码

package com.huang.config;

import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import lombok.extern.slf4j.Slf4j;
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.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import org.springframework.stereotype.Component;

import java.text.SimpleDateFormat;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

/**
 * Author :　Administrator
 * CreateTime : 2026/8/13-17:47
 */

@Configuration
@Slf4j
public class RedisTemplateConfig {

    @Bean
    public RedisTemplate<String,Object> redisTemplate(RedisConnectionFactory redisConnectionFactory){
        RedisTemplate<String,Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(redisConnectionFactory);
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.activateDefaultTyping(
                objectMapper.getPolymorphicTypeValidator(),
                ObjectMapper.DefaultTyping.NON_FINAL,
                JsonTypeInfo.As.PROPERTY
        );
        JavaTimeModule javaTimeModule = new JavaTimeModule();
        javaTimeModule.addSerializer(LocalDateTime.class,new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        javaTimeModule.addDeserializer(LocalDateTime.class,new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        javaTimeModule.addSerializer(LocalDate.class,
                new LocalDateSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        javaTimeModule.addDeserializer(LocalDate.class,
                new LocalDateDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        javaTimeModule.addSerializer(LocalTime.class,
                new LocalTimeSerializer(DateTimeFormatter.ofPattern("HH:mm:ss")));
        javaTimeModule.addDeserializer(LocalTime.class,
                new LocalTimeDeserializer(DateTimeFormatter.ofPattern("HH:mm:ss")));
        objectMapper.registerModule(javaTimeModule);
        objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);

        redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer(objectMapper));
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashValueSerializer(new GenericJackson2JsonRedisSerializer(objectMapper));
        //redisTemplate.setDefaultSerializer(new GenericJackson2JsonRedisSerializer());
        return redisTemplate;
    }
}