• 去除springboot自带Jackson,必须去除,画重点,springboot2.x在引入了spring-boot-starter-data-redis的时候,如果不去除Jackson,即使配置了FastJsonHttpMessageConverter,依然不生效,所以必须去除,但是如果不引入spring-boot-starter-data-redis则不影响,目前不知道原因,就去除了吧

      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-web</artifactId>
          <exclusions>
              <exclusion>
                  <artifactId>jackson-databind</artifactId>
                  <groupId>com.fasterxml.jackson.core</groupId>
              </exclusion>
          </exclusions>
      </dependency>
      <dependency>
          <groupId>com.alibaba</groupId>
          <artifactId>fastjson</artifactId>
          <version>1.2.60</version>
      </dependency>
  

• 配置GenericFastJson2JsonRedisSerializer

  package com.fengche.emsa.serializers;
  
  import com.alibaba.fastjson.JSON;
  import com.alibaba.fastjson.parser.ParserConfig;
  import com.alibaba.fastjson.serializer.SerializerFeature;
  import org.springframework.data.redis.serializer.RedisSerializer;
  import org.springframework.data.redis.serializer.SerializationException;
  import org.springframework.lang.Nullable;
  import org.springframework.stereotype.Component;
  
  @Component
  public class GenericFastJson2JsonRedisSerializer implements RedisSerializer<Object> {
  
      static final byte[] EMPTY_ARRAY = new byte[0];
  
      static {
          ParserConfig.getGlobalInstance().setAutoTypeSupport(true);
      }
  
      public byte[] serialize(@Nullable Object source) throws SerializationException {
          if (source == null) {
              return EMPTY_ARRAY;
          } else {
              try {
                  return JSON.toJSONBytes(source, SerializerFeature.WriteClassName);
              } catch (Exception var3) {
                  throw new SerializationException("Could not write JSON: " + var3.getMessage(), var3);
              }
          }
      }
  
      public Object deserialize(@Nullable byte[] source) throws SerializationException {
          if (isEmpty(source))
              return null;
          return JSON.parse(source);
      }
  
      static boolean isEmpty(@Nullable byte[] data) {
          return data == null || data.length == 0;
      }
  
  }
  
  

• 配置RedisTemplate

      @Bean
      public RedisTemplate<String, Serializable> redisTemplate(LettuceConnectionFactory connectionFactory,StringRedisSerializer stringRedisSerializer,GenericFastJson2JsonRedisSerializer genericFastJson2JsonRedisSerializer){
          RedisTemplate<String,Serializable> redisTemplate = new RedisTemplate<>();
          redisTemplate.setKeySerializer(stringRedisSerializer);
          redisTemplate.setValueSerializer(genericFastJson2JsonRedisSerializer);
          redisTemplate.setConnectionFactory(connectionFactory);
          return redisTemplate;
      }
  
      @Bean
      public StringRedisSerializer stringRedisSerializer(){
          return new StringRedisSerializer();
      }
  
  

• 配置FastJsonHttpMessageConverter

  /**
       * 添加fastjson为默认json解析
       *
       * @param converters
       */
      @Override
      public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
          // 定义一个转换消息的对象
          FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
          //fastConverter.getFastJsonConfig().getSerializeConfig().put(Json.class, com.fengche.education.config.SwaggerJsonSerializer.instance);
          // 添加fastjson的配置信息 比如 ：是否要格式化返回的json数据
          FastJsonConfig fastJsonConfig = new FastJsonConfig();
          fastJsonConfig.setDateFormat("yyyy-MM-dd HH:mm:ss");
          fastJsonConfig.setCharset(Charset.forName("UTF-8"));
          fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat,
                  SerializerFeature.DisableCircularReferenceDetect);
          // 在转换器中添加配置信息
          fastConverter.setFastJsonConfig(fastJsonConfig);
          HttpMessageConverter<?> converter = fastConverter;
          converters.add(converter);
      }
  

• 如上就不会出错了,放心使用

特别说明

• 上述问题还有一种解决办法,代码如下:

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        // 定义一个转换消息的对象
        
        /** 这段代码其实没有实际意义,但是加上它,fastjson就起作用,debug代码,其实没有移除任何的converter,但是加上就可以使fastjson生效,不加就不生效 */
        List<HttpMessageConverter<?>> list = new ArrayList<>();
        for (HttpMessageConverter<?> converter : converters) {
            if (converter.getClass().isAssignableFrom(MappingJackson2HttpMessageConverter.class)){
                list.add(converter);
            }
        }
        converters.removeAll(list);
        /** ************************************************************************************************************************* */
        ParserConfig.getGlobalInstance().setAutoTypeSupport(true);
        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
        // 添加fastjson的配置信息 比如 ：是否要格式化返回的json数据
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setDateFormat("yyyy-MM-dd HH:mm:ss");
        fastJsonConfig.setCharset(Charset.forName("UTF-8"));
        fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat,
                                             SerializerFeature.DisableCircularReferenceDetect);
        // 在转换器中添加配置信息
        fastConverter.setFastJsonConfig(fastJsonConfig);
        HttpMessageConverter<?> converter = fastConverter;
        converters.add(converter);
    }