redis 解决key的乱码问题,并清理详解

    key乱码问题

    因redis默认使用JdkSerializationRedisSerializer来进行序列化,造成key是乱码,如下:

    keys ‘*!report:flag:phon*’

    1) “\xac\xed\x00\x05t\x00!report:flag:phone_156464”

    2) “\xac\xed\x00\x05t\x00!report:flag:phone_198946”

    3) “\xac\xed\x00\x05t\x00!report:flag:phone_183302”

    解决key乱码

    
    private RedisTemplate redisTemplate;
    
     @Autowired(required = false)
     public void setRedisTemplate(RedisTemplate redisTemplate) {
      RedisSerializer stringSerializer = new StringRedisSerializer();
      redisTemplate.setKeySerializer(stringSerializer);
      redisTemplate.setValueSerializer(stringSerializer);
      redisTemplate.setHashKeySerializer(stringSerializer);
      redisTemplate.setHashValueSerializer(stringSerializer);
      this.redisTemplate = redisTemplate;
     }
    

    清理乱码key

    官方不支持 del ‘*keys’方式模糊/批量删除key。但是keys命令支持模糊匹配,所以采取以下方式:

    方式1:可删除正常key,无法删除乱码key

    redis-cli -h 192.168.1.21 -a password -n 2 –scan –pattern ‘*!report:flag:phon*’ | xargs redis-cli -h 192.168.1.21 -a password -n 2 DEL

    方式2:成功删除

    del “\xac\xed\x00\x05t\x00!report:flag:phone_183302” “\xac\xed\x00\x05t\x00!report:flag:phone_198946”

    补充知识:redis key和value的乱码问题解决,含日期转化格式问题

    在项目中,遇到的问题是redis的key和value出现的乱码问题:在这里插入图片描述

    而原本的内容为下:

    
    {
      "status":"success",
      "data":{
        "id":3,
        "title":"花林",
        "price":99,
        "stock":81,
        "description":"美女一只",
        "sales":17,
        "imgUrl":"https://xiaolei1996.oss-cn-shanghai.aliyuncs.com/blog/title/we1.jpg",
        "promoStatus":2,
        "promoPrice":50,
        "promoId":1,
        "startDate":"2020-03-23 21:50:59"
      }
    }
    

    原因: 是因为和redis内部的编码协议出现了问题,所以需要改进。spring提供了一个优化方案。springboot的redisTemplate改进。

    
    @Component
    @EnableRedisHttpSession(maxInactiveIntervalInSeconds = 3600)
    public class RedisConfig {
      @Bean
      public RedisTemplate redisTemplate(RedisConnectionFactory factory){
        RedisTemplate redisTemplate = new RedisTemplate();
        redisTemplate.setConnectionFactory(factory);
    
        //首先解决key的序列化问题
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        redisTemplate.setKeySerializer(stringRedisSerializer);
    
        //解决value的序列化问题
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
    
        return redisTemplate;
      }
    }
    

    比之前好了,但是还有点小问题,json的数据比以前多了,这是因为日期的转化出现问题,这块的知识触及盲区,就先把解决方案写下面,以后有时间在研究。

    
    public class JodaDateTimeJsonSerializer extends JsonSerializer<DateTime> {
      @Override
      public void serialize(DateTime value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
        gen.writeString(value.toString("yyyy-MM-dd HH:mm:ss"));
    
      }
    }
    
    
    public class JodaDateTimeJsonDeserializer extends JsonDeserializer<DateTime> {
      @Override
      public DateTime deserialize(JsonParser p, DeserializationContext ctxt
      ) throws IOException, JsonProcessingException {
        String dateString= p.readValueAs(String.class);
        DateTimeFormatter dateTimeFormatter = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss");
    
        return DateTime.parse(dateString,dateTimeFormatter);//转成
      }
    }
    
    
    @Component
    @EnableRedisHttpSession(maxInactiveIntervalInSeconds = 3600)
    public class RedisConfig {
      @Bean
      public RedisTemplate redisTemplate(RedisConnectionFactory factory){
        RedisTemplate redisTemplate = new RedisTemplate();
        redisTemplate.setConnectionFactory(factory);
    
        //首先解决key的序列化问题
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        redisTemplate.setKeySerializer(stringRedisSerializer);
    
        //解决value的序列化问题
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
    
        //改进日期转化问题
        ObjectMapper objectMapper = new ObjectMapper();
        SimpleModule simpleModule = new SimpleModule();
        simpleModule.addSerializer(DateTime.class,new JodaDateTimeJsonSerializer());
        simpleModule.addDeserializer(DateTime.class,new JodaDateTimeJsonDeserializer());
    
    //解决反序列化问题	objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        objectMapper.registerModule(simpleModule);
        jackson2JsonRedisSerializer.setObjectMapper(objectMapper);
        redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
    
        return redisTemplate;
      }
    }
    

    最后终于出现了预期的效果

    以上这篇redis 解决key的乱码问题,并清理详解就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持lingkb。