fastJsonConfig.setSerializerFeatures(
            SerializerFeature.DisableCircularReferenceDetect,
            SerializerFeature.WriteEnumUsingToString,
            SerializerFeature.WriteDateUseDateFormat,
            SerializerFeature.WriteNullStringAsEmpty,
            SerializerFeature.WriteNullListAsEmpty,
            SerializerFeature.WriteNullNumberAsZero,
            SerializerFeature.WriteNullBooleanAsFalse,
            SerializerFeature.QuoteFieldNames);        

    fastJsonConfig.getSerializeConfig().put(BigInteger.class, ToStringSerializer.instance);
    fastJsonConfig.getSerializeConfig().put(Long.class, ToStringSerializer.instance);
    fastJsonConfig.getSerializeConfig().put(Long.TYPE, ToStringSerializer.instance);