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SpringBoot操作Redis乱码

发布时间 2023-11-14 23:02:57作者: 有何和不可

1、使用Redis报对象实现序列化错误

使用Redis存储Java对象时，必须实现Serializable接口，从而实现序列化。
所以通常Java中的实体类都实现Serializable接口，实现序列化。

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User implements Serializable {

    private static final long serialVersionUID = 1L;

    private String name;
    private int age;
}

2、SpringBoot操作Redis存储的key值在redis中出现乱码

由于Redis中默认时JDK的序列化，可以通过重写RedisTemplate解决。

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;
import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * 说明：自定义redis配置类
 * 日期：2023/11/14 22:13
 */
@Configuration
public class RedisConfig {

    @Bean
    @SuppressWarnings("all")
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory) {
        RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
        template.setConnectionFactory(factory);
        // 序列化配置
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();

        // key采用String的序列化方式
        template.setKeySerializer(stringRedisSerializer);
        // hash的key也采用String的序列化方式
        template.setHashKeySerializer(stringRedisSerializer);
        // value序列化方式采用jackson
        template.setValueSerializer(jackson2JsonRedisSerializer);
        // hash的value序列化方式采用jackson
        template.setHashValueSerializer(jackson2JsonRedisSerializer);
        template.afterPropertiesSet();
        return template;
    }
}

如果提示ObjectMapper 不存在，导包即可
1、Spring项目

<!-- 根据自己需要引入相关版本依赖。 -->
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-core</artifactId>
  <version>2.9.10</version>
</dependency>
 
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>2.9.10</version>
</dependency>
 
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-annotations</artifactId>
  <version>2.9.10</version>
</dependency>

2、如果是SpringBoot项目导入web依赖即可，里面已经包含改包

 <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
 </dependency>

3、最后使用自己重写的RedisTemplate即可

 @SpringBootTest
public class TestApplication {

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

    @Test
    void test01() {
        User user = new User("小明", 100);
        redisTemplate.opsForValue().set("keyUser", user);
        System.out.println(redisTemplate.opsForValue().get("user"));
    }
}