Detailed Explanation of Java JSON not generating null or empty string properties

Everyone usually uses Java objects to convert JSON strings. Null or empty string properties do not need to be generated into the JSON string.

The following method generates JSON string properties, even if some properties are not used.

JSONArray jsonarray = JSONArray.fromObject(ecmMessageMap.values());
msgObj = jsonarray.toString();
{"actionType":"","clientIp":"","ecServiceNumber":"","ecmMessageEventFlow":null,"endTime":"","eventId":"","faultEventFlowList":[],"groupId":"","psize":0,"receiver":"","receiverEcServiceNumber":"","sender":"","startTime":"","successEventIds":[]}

Gson Usage:

Gson g = new Gson();
msgObj = g.toJson(ecmMessage);
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If large data transmission or storage in the database, it is reasonable to generate JSON strings, which will save a lot of storage space and transmission speed. For example, exchange monitoring mq data in JSON format, exchange monitoring disaster recovery database storage.

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