user3131769 user3131769 - 6 months ago 345
JSON Question

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

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"
}
]
}
]
}

Answer

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.

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