How to Update JSON value using Java

Question

I have below json, i want to update each and every value of that json but sometimes only one value

{ 
"msgType": "NEW",
"code":          


        

Answer 1

You need to write the updated JSON into the file from where JSON was read. Also, I did not understand your variable assignment so I have updated that as well. Use below code:

FileReader reader = new FileReader(filePath);

JSONParser jsonParser = new JSONParser();
JSONObject jsonObject = (JSONObject) jsonParser.parse(reader);

System.out.println(jsonObject);


long id =Long.valueOf((String) idNewObj.get("plid"));
System.out.println(id);


jsonObject.put("plid",PL809809809);

System.out.println(jsonObject);
FileWriter writer = new FileWriter(filePath, false); //overwrites the content of file
writer.write(jsonObject.toString());
writer.close();