配置spring cache RedisCacheManager的序列化方法

經過查看autoconfigure源碼

org.springframework.boot.autoconfigure.cache.RedisCacheConfiguration;

部分源碼以下：

private org.springframework.data.redis.cache.RedisCacheConfiguration determineConfiguration(
      ClassLoader classLoader) {
   if (this.redisCacheConfiguration != null) {
 return this.redisCacheConfiguration;
 }
   Redis redisProperties = this.cacheProperties.getRedis();
   org.springframework.data.redis.cache.RedisCacheConfiguration config = org.springframework.data.redis.cache.RedisCacheConfiguration
         .defaultCacheConfig();
 config = config.serializeValuesWith(SerializationPair
 .fromSerializer(new JdkSerializationRedisSerializer(classLoader)));
   if (redisProperties.getTimeToLive() != null) {
      config = config.entryTtl(redisProperties.getTimeToLive());
   }
   if (redisProperties.getKeyPrefix() != null) {
      config = config.prefixKeysWith(redisProperties.getKeyPrefix());
   }
   if (!redisProperties.isCacheNullValues()) {
      config = config.disableCachingNullValues();
   }
   if (!redisProperties.isUseKeyPrefix()) {
      config = config.disableKeyPrefix();
   }
   return config;
}

能夠看到默認是使用的 JdkSerializationRedisSerializer ，還有就是若是容器裏已經有 redisCacheConfiguration 就直接使用了。

那麼只須要本身注入一個 RedisCacheConfiguration 便可。

代碼能夠直接用源碼裏面的：)，調整序列化部分便可。

 1 @Configuration  2 @Conditional(SimpleCacheCondition.class)  3 public class MyRedisCacheConfiguration {  4     private final CacheProperties cacheProperties;  5  MyRedisCacheConfiguration(CacheProperties cacheProperties) {  6         this.cacheProperties = cacheProperties;  7  }  8  @Bean  9     public org.springframework.data.redis.cache.RedisCacheConfiguration determineConfiguration() { 10         CacheProperties.Redis redisProperties = this.cacheProperties.getRedis(); 11         org.springframework.data.redis.cache.RedisCacheConfiguration config = org.springframework.data.redis.cache.RedisCacheConfiguration 12  .defaultCacheConfig(); 13         config = config.serializeValuesWith(RedisSerializationContext.SerializationPair 14  .fromSerializer(valueSerializer())); 15         if (redisProperties.getTimeToLive() != null) { 16             config = config.entryTtl(redisProperties.getTimeToLive()); 17  } 18         if (redisProperties.getKeyPrefix() != null) { 19             config = config.prefixKeysWith(redisProperties.getKeyPrefix()); 20  } 21         if (!redisProperties.isCacheNullValues()) { 22             config = config.disableCachingNullValues(); 23  } 24         if (!redisProperties.isUseKeyPrefix()) { 25             config = config.disableKeyPrefix(); 26  } 27         return config; 28  } 29     /**
30  * 使用Jackson序列化器 31  * @return
32      */
33     private RedisSerializer<Object> valueSerializer() { 34         ObjectMapper objectMapper = new ObjectMapper(); 35  objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY); 36  objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL); 37         return new GenericJackson2JsonRedisSerializer(objectMapper); 38  } 39 
40 }

這裏使用的是 GenericJackson2JsonRedisSerializer ；

參考文檔：

https://docs.spring.io/spring-data/redis/docs/current/api/org/springframework/data/redis/serializer/RedisSerializer.html

能夠看到已有的可用序列化器:

GenericJackson2JsonRedisSerializer, GenericToStringSerializer, Jackson2JsonRedisSerializer, JdkSerializationRedisSerializer, OxmSerializer, StringRedisSerializer

這裏順便學習一下 @Conditional ，這個註解能夠幫咱們控制何時來註冊組件。

好比這裏寫了一個 RedisCacheConfiguration 配置，那我只想在啓用了redis緩存時再註冊，就能夠使用這個註解，如 @Conditional(SimpleCacheCondition.class) 。

定義 SimpleCacheCondition ，部分代碼參考 org.springframework.boot.autoconfigure.cache.CacheCondition 

public class SimpleCacheCondition implements Condition { /** * Determine if the condition matches. * * @param context the condition context * @param metadata metadata of the {@link AnnotationMetadata class} * or {@link MethodMetadata method} being checked * @return {@code true} if the condition matches and the component can be registered, * or {@code false} to veto the annotated component's registration */ @Override public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) { try { String sourceClass = ""; if (metadata instanceof ClassMetadata) { sourceClass = ((ClassMetadata) metadata).getClassName(); } Environment environment = context.getEnvironment(); BindResult<CacheType> specified = Binder.get(environment) .bind("spring.cache.type", CacheType.class); if (!specified.isBound()) { return false; }
　　　　　　　//redis cache 啓用 而且 是自定義的redisCacheConfiguration if (specified.get().equals(CacheType.REDIS) && sourceClass.equals(MyRedisCacheConfiguration.class.getTypeName())) { return true; } }catch (Exception ex) {} return false; } }