how to fetch JSONObject with array of objects

Question

I have json string data like:

 {"contactlist":["{"id":"1","mobile":"186010855","name":"Intex"}","{"id":"212","mobile":"980067","name":"pari"}"]}

I want to fetch all data means id,mobile and name for all.. So, I have Contact Class :

public class Contact {
    private String id;
    private String name;
    private String mobile;
    //getters and settrs & constructors
    }

and for fetching I have tried:

       String stringdata=
              "{"contactlist":["{"id":"1","mobile":"186010855","name":"Intex"}","
                {"id":"212","mobile":"980067","name":"pari"}"]}";
         try{ 
            Contact contact1 = new Contact();
            contact1 = new Gson().fromJson(contactreceive, Contact.class);
            Contact contact = new Contact(contact1.getId(),contact1.getName(),
                                            contact1.getMobile());

                System.out.println (contact);
          }catch(Exception e){

           }

But I can not fetch data like this..how can I fetch this json data?

I think you are deserializing and not fetching it. And JSON also is an invalid JSON. Please post a valid one. — Shubham Chaurasia
– Shubham Chaurasia, Commented Jan 4, 2016 at 12:55

Gorbles · Accepted Answer · 2016-01-04 13:48:49Z

2

Your JSON is invalid, as per @ShubhamChaurasia 's comment. The following JSON validates:

{
    "contactlist": [{
        "id": "1",
        "mobile": "186010855",
        "name": "Intex"
    },
    {
        "id": "212",
        "mobile": "980067",
        "name": "pari"
    }]
}

Escape this in Java as you have already been shown (with \") and this will stop your JSON validation errors. I recommend combining this with @Joopkins ' or @JanTheGun 's answer.

A good site I use for JSON validation is http://jsonlint.com/.

answered Jan 4, 2016 at 13:48

Gorbles

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Comments

JanTheGun · Accepted Answer · 2016-01-04 13:04:12Z

1

You need to escape the double quotes to get a valid json string. Then you can read the json array like this:

String stringdata = "{\"contactlist\":[{\"id\":\"1\",\"mobile\":\"186010855\",\"name\":\"Intex\"},{\"id\":\"212\",\"mobile\":\"980067\",\"name\":\"pari\"}]}";

JsonElement jsonElement = new JsonParser().parse(stringdata);
JsonObject jsonOject = jsonElement.getAsJsonObject();
JsonArray jsonArray = jsonOject.getAsJsonArray("contactlist");

for (JsonElement element : jsonArray) {
    JsonObject obj = element.getAsJsonObject();

    String id = obj.get("id").toString();
    String name = obj.get("name").toString();
    String mobile = obj.get("mobile").toString();

    Contact contact = new Contact(id, name, mobile);
    System.out.println("id: " + contact.getId());
    System.out.println("name: " + contact.getName());
    System.out.println("mobile: " + contact.getMobile());
    System.out.println("");
}

answered Jan 4, 2016 at 13:04

JanTheGun

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3 Comments

user_apr Over a year ago

Error: com.google.gson.stream.MalformedJsonException: Unterminated array at line 1 column 21

JanTheGun Over a year ago

Did you escape the double quotes in your json string?

user_apr Over a year ago

Yes, I have used replace("\\", "");

Joopkins · Accepted Answer · 2016-01-04 13:44:14Z

1

You can convert the stringdata into a JSONArray containing a JSONObject for each contact.

    JSONObject contactData = new JSONObject(stringdata);
    JSONArray contactArray = contactData.getJSONArray("contactlist");
    //Create an array of contacts to store the data
    Contact[] contacts = new Contact[contactArray.length()];
    //Step through the array of JSONObjects and convert them to your Java class
    Gson gson = new Gson();
    for(int i = 0; i < contactArray.length(); i++){
         contacts[i] = gson.fromJson(
              contactArray.getJSONObject(i).toString(), Contact.class);
          }

Now you have an array of Contacts from your raw JSON data.

edited Jan 4, 2016 at 13:44

answered Jan 4, 2016 at 13:10

Joopkins

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1 Comment

user_apr Over a year ago

Error: Expected a ',' or ']' at 20 [character 21 line 1]

Rahul Chaudhary · Accepted Answer · 2016-01-04 13:33:50Z

0

JSONObject contactData = new JSONObject(stringdata);
JSONArray contactArray = contactData.getJSONArray("contactlist");
for(int i=0;i<contactArray .length;i++){
    JSONObject jsonObject=contactArray.getJSONObject(i));
    String id=jsonObject.getString("id")

    String key=jsonObject.getString("key")
}

answered Jan 4, 2016 at 13:33

Rahul Chaudhary

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