redis 解决key的乱码问题,并清理详解

2020-10-28 21:27:37

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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