'How to generate JSON Stringer in Android for this format

I need to send data to database in this format - 

{"param1":"value1", "param2":"value2", "param3": {"username": "admin", "password": "123"}}

How to generate this using JSONStringer ?

I tried this -

vm = new JSONStringer().object().key("param1").value("value1")
                  .object().key("param2").value("value2")
                    .key("param3").object()
                    .key("username").value("admin")
                    .key("password").value("123")
                    .endObject().endObject().endObject();

But I'm getting this error -

org.json.JSONException: Nesting problem at org.json.JSONStringer.beforeValue(JSONStringer.java:415)

javaandroidjson


Solution 1:[1]

JSONObject object1 = new JSONObject();

object1.put("param1", "value1");
object1.put("param2", "param2");

JSONObject innerObject1 = new JSONObject();
innerObject1.put("username", "admin");
innerObject1.put("password", "123");

object1.put("param3",innerObject1);

String jsonStr = object1.toString();

Ideally reverse of JSON parsing can be applied to create a json string object, so that the same can be send to Server/DB

Solution 2:[2]

Try this

  try {
        JSONObject object=new JSONObject();
        object.put("param1","value1");
        object.put("param2","value2");
        JSONObject param3=new JSONObject();
        paraam3.put("username","admin");
        paraam3.put("password","123");
        object.put("param3",param3);
    } catch (JSONException e) {
        e.printStackTrace();
    }

Solution 3:[3]

You can create model which will be your java file same as your JSON file and can use gson library which is supported by Google to do JSON parsing. The library is quite flexible and easy to use then using traditional method of JSON parsing.

Model File

public class Response {
public String param1;
public String param2;
public Param3 param3;
public Response(String param1, String param2) {
    this.param1 = param1;
    this.param2 = param2;
}
      public class Param3 {
            public String username;
            public String password;

    public Param3(String username, String password) {
        this.username = username;
        this.password = password;
    }
      }
}

In file in which you insert data

Response res = new Response("value1", "value2", new Param3("admin","123"));
String dbResult = new Gson.toJson(res);

Solution 4:[4]

If you are looking for the actual solution using org.json.JSONStringer

JSONWriter writer = stringer3.object()
            .key("param1").value("value1")
            .key("param2").value("value2")
            .key("param3").object()
                .key("username").value("admin")
                .key("password").value("123")
            .endObject()
            .endObject();
    System.out.println(writer.toString());

You can think of the object() method as opening a new parenthesis and the endObject() as closing it

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Sreehari
Solution 2 Dixit Panchal
Solution 3
Solution 4 Austin Poole

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