Creating nested JSON object for the following structure in Java using JSONObject? [closed]

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I want to build a JSON Object similar to following the structure in java using JSONObject and JSONArray.

I have gone through various posts in stack overflow, which suggests using methods like push, put etc which I am unable to identify for JSONArray. Please help.

{
    "name": "sample",
    "def": [
        {
            "setId": 1,
            "setDef": [
                {
                    "name": "ABC",
                    "type": "STRING"
                },
                {
                    "name": "XYZ",
                    "type": "STRING"
                }
            ]
        },
        {
            "setId": 2,
            "setDef": [
                {
                    "name": "abc",
                    "type": "STRING"
                },
                {
                    "name": "xyz",
                    "type": "STRING"
                }
            ]
        }
    ]
}

Jmini · Accepted Answer · 2016-05-30 09:25:32Z

69

With the imports org.json.JSONArray and org.json.JSONObject

JSONObject object = new JSONObject();
object.put("name", "sample");
JSONArray array = new JSONArray();

JSONObject arrayElementOne = new JSONObject();
arrayElementOne.put("setId", 1);
JSONArray arrayElementOneArray = new JSONArray();

JSONObject arrayElementOneArrayElementOne = new JSONObject();
arrayElementOneArrayElementOne.put("name", "ABC");
arrayElementOneArrayElementOne.put("type", "STRING");

JSONObject arrayElementOneArrayElementTwo = new JSONObject();
arrayElementOneArrayElementTwo.put("name", "XYZ");
arrayElementOneArrayElementTwo.put("type", "STRING");

arrayElementOneArray.put(arrayElementOneArrayElementOne);
arrayElementOneArray.put(arrayElementOneArrayElementTwo);

arrayElementOne.put("setDef", arrayElementOneArray);
array.put(arrayElementOne);
object.put("def", array);

I did not include first array's second element for clarity. Hope you got the point though.

EDIT:

The previous answer was assuming you were using org.json.JSONObject and org.json.JSONArray.

For net.sf.json.JSONObject and net.sf.json.JSONArray :

JSONObject object = new JSONObject();
object.element("name", "sample");
JSONArray array = new JSONArray();

JSONObject arrayElementOne = new JSONObject();
arrayElementOne.element("setId", 1);
JSONArray arrayElementOneArray = new JSONArray();

JSONObject arrayElementOneArrayElementOne = new JSONObject();
arrayElementOneArrayElementOne.element("name", "ABC");
arrayElementOneArrayElementOne.element("type", "STRING");

JSONObject arrayElementOneArrayElementTwo = new JSONObject();
arrayElementOneArrayElementTwo.element("name", "XYZ");
arrayElementOneArrayElementTwo.element("type", "STRING");

arrayElementOneArray.add(arrayElementOneArrayElementOne);
arrayElementOneArray.add(arrayElementOneArrayElementTwo);

arrayElementOne.element("setDef", arrayElementOneArray);
object.element("def", array);

Basically it's the same, replacing the method 'put' for 'element' in JSONObject, and 'put' for 'add' in JSONArray.

edited May 30, 2016 at 9:25

Jmini

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answered Feb 26, 2014 at 13:31

goten

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2 Comments

user3131769 Over a year ago

thanks for your time, as I mentioned in my question I am unable to access put method of JSONArray. I am using net.sf.Json API to create this objects (JSONObject and JSONArray). Correct me If I am wrong.

goten Over a year ago

I assumed you were using org.json.JSONObject and org.json.JSONArray. Sorry. According to json-lib.sourceforge.net/apidocs/net/sf/json/JSONObject.html and json-lib.sourceforge.net/apidocs/net/sf/json/JSONArray.html, i guess you could replace all 'put' methods for the 'element' method for JSONObject, and replace 'put' for 'add' in JSONArray

ErstwhileIII · Accepted Answer · 2014-02-26 14:03:07Z

0

Here is one crude example. You should be able to refine. (You may be interested in this Java "tutorial" http://docs.oracle.com/javaee/7/tutorial/doc/jsonp.htm#GLRBB

(This example uses the JSON reference implementation included in Java EE (and available here: https://java.net/projects/jsonp/downloads/directory/ri)

package com.demo;
import java.io.FileWriter;
import java.io.IOException;
import javax.json.Json;
import javax.json.stream.JsonGenerator;

public class JSONExample {
public static void main(String[] args) {
    FileWriter writer = null;
    try {
        writer = new FileWriter("C:\\Users\\Joseph White\\Downloads\\jsontext.txt");
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    JsonGenerator gen = Json.createGenerator(writer);

    gen.writeStartObject().write("name", "sample")
        .writeStartArray("def")
          .writeStartObject().write("setId", 1)
             .writeStartArray("setDef")
                .writeStartObject().write("name", "ABC").write("type", "STRING")
                .writeEnd()
                .writeStartObject().write("name", "XYZ").write("type", "STRING")
                .writeEnd()
            .writeEnd()
          .writeEnd()
            .writeStartObject().write("setId", 2)
              .writeStartArray("setDef")
                .writeStartObject().write("name", "abc").write("type", "STRING")
                .writeEnd()
                .writeStartObject().write("name", "xyz").write("type", "STRING")
                .writeEnd()
              .writeEnd()
            .writeEnd()
          .writeEnd()
        .writeEnd();

    gen.close();

}

 }

answered Feb 26, 2014 at 14:03

ErstwhileIII

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4 Comments

wheeleruniverse Over a year ago

This looks crazy and I bet it's a blast to debug.

Witold Kaczurba Over a year ago

This is an overkill.

Schwertfisch Over a year ago

docs.oracle.com/cloud/latest/fmw122100/WLPRG/…

Rajeev Rathor Over a year ago

not looks enterprise standards code.

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