JSONObject - How to get a value?

Question

I'm using a java class on http://json.org/javadoc/org/json/JSONObject.html.

The following is my code snippet:

String jsonResult = UtilMethods.getJSON(this.jsonURL, null);
json = new JSONObject(jsonResult);

getJSON returns the following string

{"LabelData":{"slogan":"AWAKEN YOUR SENSES","jobsearch":"JOB SEARCH","contact":"CONTACT","video":"ENCHANTING BEACHSCAPES","createprofile":"CREATE PROFILE"}}

How do I get the value of 'slogan'?

I tried all the methods listed on the page, but none of them worked.

Just FYI, something like Jackson can be anlot faster and easier than using the json reference implementation. — Jon7, Sep 17 '11 at 02:34
@Jon7 // Thank you for the suggestion. I will try out Jackson. I'm new to Java..Thanks :) — Moon, Sep 17 '11 at 04:59

score 159 · Accepted Answer · answered Sep 17 '11 at 00:24

159

String loudScreaming = json.getJSONObject("LabelData").getString("slogan");

answered Sep 17 '11 at 00:24

phihag

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1

How would we do this with GSON? – Prithvi Boinpally Dec 09 '20 at 06:24
1

@PrithviBoinpally, you can do the folowing: ```String temp = json.get("labelData").getAsString();``` – Sanevent Apr 21 '21 at 06:26
What is "json" variable type here ? – vikramvi Aug 04 '21 at 07:18
@vikramvi That refers to the question, where `json` was a `JSONObject`. – phihag Aug 04 '21 at 09:13
suggestion from @Sanevent works with `google-gson` library not `org.json` – ash17 Sep 02 '22 at 14:15

score 10 · Answer 2 · edited May 23 '17 at 12:10

If it's a deeper key/value you're after and you're not dealing with arrays of keys/values at each level, you could recursively search the tree:

public static String recurseKeys(JSONObject jObj, String findKey) throws JSONException {
    String finalValue = "";
    if (jObj == null) {
        return "";
    }

    Iterator<String> keyItr = jObj.keys();
    Map<String, String> map = new HashMap<>();

    while(keyItr.hasNext()) {
        String key = keyItr.next();
        map.put(key, jObj.getString(key));
    }

    for (Map.Entry<String, String> e : (map).entrySet()) {
        String key = e.getKey();
        if (key.equalsIgnoreCase(findKey)) {
            return jObj.getString(key);
        }

        // read value
        Object value = jObj.get(key);

        if (value instanceof JSONObject) {
            finalValue = recurseKeys((JSONObject)value, findKey);
        }
    }

    // key is not found
    return finalValue;
}

Usage:

JSONObject jObj = new JSONObject(jsonString);
String extract = recurseKeys(jObj, "extract");

Using Map code from https://stackoverflow.com/a/4149555/2301224

Implementation has a bug(s): (1) while-loop is continuing even after recursive call returns a legitimate value. (2) you have no way to differentiate between, key not found vs key has legitimate value as "". That said, you are calling keys() method on JSONObject which sort of indicates that here JSONObject is nothing but Map. Moreover, you are anyway iterating keys() in JSONObject then why to explicitly converting it into the Map? — sactiw, May 08 '17 at 07:57

Natarajan · Answer 3 · 2019-09-12T12:56:38.690

This may be helpful while searching keys present in nested objects and nested arrays. And this is a generic solution to all cases.

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

public class MyClass
{
    public static Object finalresult = null;
    public static void main(String args[]) throws JSONException
    {
        System.out.println(myfunction(myjsonstring,key));
    }

    public static Object myfunction(JSONObject x,String y) throws JSONException
    {
        JSONArray keys =  x.names();
        for(int i=0;i<keys.length();i++)
        {
            if(finalresult!=null)
            {
                return finalresult;                     //To kill the recursion
            }

            String current_key = keys.get(i).toString();

            if(current_key.equals(y))
            {
                finalresult=x.get(current_key);
                return finalresult;
            }

            if(x.get(current_key).getClass().getName().equals("org.json.JSONObject"))
            {
                myfunction((JSONObject) x.get(current_key),y);
            }
            else if(x.get(current_key).getClass().getName().equals("org.json.JSONArray"))
            {
                for(int j=0;j<((JSONArray) x.get(current_key)).length();j++)
                {
                    if(((JSONArray) x.get(current_key)).get(j).getClass().getName().equals("org.json.JSONObject"))
                    {
                        myfunction((JSONObject)((JSONArray) x.get(current_key)).get(j),y);
                    }
                }
            }
        }
        return null;
    }
}

Possibilities:

"key":"value"
"key":{Object}
"key":[Array]

Logic :

I check whether the current key and search key are the same, if so I return the value of that key.
If it is an object, I send the value recursively to the same function.
If it is an array, I check whether it contains an object, if so I recursively pass the value to the same function.

can you please answer to this que?https://stackoverflow.com/questions/60329223/how-to-update-existing-json-file-in-java/60329607#60329607 — Siva, Feb 26 '20 at 16:41

score 0 · Answer 4 · edited Nov 11 '18 at 09:15

0

You can try the below function to get value from JSON string,

public static String GetJSONValue(String JSONString, String Field)
{
       return JSONString.substring(JSONString.indexOf(Field), JSONString.indexOf("\n", JSONString.indexOf(Field))).replace(Field+"\": \"", "").replace("\"", "").replace(",","");   
}

edited Nov 11 '18 at 09:15

Udhav Sarvaiya

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answered Nov 11 '18 at 07:08

ravi creed

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6

JSONObject - How to get a value?

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