redis之RedisTemplate和StringRedisTemplate的区别

1.RedisTemplate和StringRedisTemplate的区别

StringRedisTemplate继承RedisTemplate
两者的数据是不共通的（默认的序列化机制导致key不一样）
StringRedisTemplate默认采用的是String的序列化策略
RedisTemplate默认采用的是JDK的序列化策略，会将数据先序列化成字节数组然后在存入Redis数据库

针对区别的第3点和第4点

查看后执行的后台打印

redis可视化工具中查看数据

总结
- 当redis数据库里面本来操作的是字符串数据的时候，那使用StringRedisTemplate即可
- 数据是复杂的对象类型，那么使用RedisTemplate是更好的选择

1.1序列化机制

想要改变RedisTemplate生成的key和value，就要使用序列化机制

新建一个配置类RedisTemplateConfiguration

package net.xdclass.xdclassredis.config;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
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 RedisTemplateConfiguration {
    @Bean
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {

        RedisTemplate<Object, Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(redisConnectionFactory);

        // 使用Jackson2JsonRedisSerialize 替换默认序列化
//        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);

        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
//        jackson2JsonRedisSerializer.setObjectMapper(objectMapper);
        Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<>(objectMapper, Object.class);

        // 设置key和value的序列化规则
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);

        // 设置hashKey和hashValue的序列化规则
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);

        // 设置支持事物
        //redisTemplate.setEnableTransactionSupport(true);
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }

}

新建一个实例对象UserDo

package net.xdclass.xdclassredis.model;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class UserDo{
    private int id;
    private String name;
    private String pwd;

}

测试一下