Whether to output fields whose value is null

String str = JSONObject.toJSONString(json,SerializerFeature.WriteMapNullValue); you can try this

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xiaovhao

Fastjson's SerializerFeature serialization property QuoteFieldNames——- Whether to use double quotes when outputting the key, the default is true  WriteMapNullValue——- Whether to output a field whose value is null, the default is false  WriteNullNumberAsZero-- If the value field is null, the output is 0, Instead of null  WriteNullListAsEmpty—--If the List field is null, the output is [], not null  WriteNullStringAsEmpty—If the character type field is null, the output is "", not null  WriteNullBooleanAsFalse--If the Boolean field is null, the output is false, and not null