how to access json array element in java

Question

i am getting json array in the output.i want to access the specific key elments from the response .how can i ..?

 ResponseEntity <String> respone;
      try {
          response =
      restTemplate.exchange(url, HttpMethod.POST, requestEntity, String.class);



      String response=response.getBody(); 
      JSONObject res = new JSONObject();
      res.put("result", response);
      System.out.println(res);
      int len=res.size();
      System.out.println(len);
      JSONParser parser=new JSONParser();
        Object obj = parser.parse(response);
        JSONArray array = (JSONArray)obj;
        System.out.println(array.get(0)); }

this is respponse format i m getting in output.i want to access the bid from the response.how can i?

  [
      {
            "bName": "abc", 
            "bId": "n86nbnhbnghgy76"

          }
        ]

jackson? gson? libraries that help you parse pretty easily through elements — Andrei Sfat
– Andrei Sfat, Commented Sep 29, 2014 at 8:05
you're using JSONParser. If you have jackson in your project, just do a ObjectMapper mapper = new ObjectMapper(); AClassThatMatchesTheModelOfThatJson thatModel = mapper.readValue(response, AClassThatMatchesTheModelOfThatJson.class); — Andrei Sfat
– Andrei Sfat, Commented Sep 29, 2014 at 8:12
possible duplicate of Accessing members of items in a JSONArray with Java — Muhammed Refaat
– Muhammed Refaat, Commented Sep 29, 2014 at 8:12

Nicolas Albert · Accepted Answer · 2014-09-29 08:09:10Z

2

Decode your string using JSONArray(String json) constructor:

String response = response.getBody(); 
JSONArray res = new JSONArray(response);
String bId = res.getJSONObject(0).get("bId");
System.out.println(bid);

answered Sep 29, 2014 at 8:09

Nicolas Albert

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3 Comments

user3189357 Over a year ago

it showing me error like this - The constructor JSONArray(String) is undefined for this line JSONArray res = new JSONArray(response);

user3189357 Over a year ago

...i am using google json library.how can i slove the above error?

Nicolas Albert Over a year ago

I don't use this implementation.

Darshan Lila · Accepted Answer · 2014-09-29 08:58:50Z

0

EDIT

Try following:

  String response=response.getBody(); 
  JSONObject res = new JSONObject();
  System.out.println(res);
  int len=res.size();
  System.out.println(len);
  JSONParser parser=new JSONParser();
    Object obj = parser.parse(response);
    JSONArray array = (JSONArray)obj;
    res=(JSONObject)array.get(0);
    System.out.println(res.get("bId"));

Output :

n86nbnhbnghgy76

This one is based on your code and with Simple Json Library.

edited Sep 29, 2014 at 8:58

answered Sep 29, 2014 at 8:18

Darshan Lila

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6 Comments

user3189357 Over a year ago

.still same error - The constructor JSONArray(String) is undefined

Darshan Lila Over a year ago

Note JSONArray.fromObject(response); is what youshould use look at second line.

user3189357 Over a year ago

..it showing this error- The method fromObject(String) is undefined for the type JSONArray

Darshan Lila Over a year ago

Download json library from sourceforge.net/projects/json-lib link. You'll be good to go.

user3189357 Over a year ago

i have added import org.json.simple.JSONArray; import org.json.simple.JSONObject;this class.but still same error.

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