updating json object using java

Question

Let i've an JSON Object like as shown below

{"Name":"Manu","Age":"25","Address":""}

Updation

Read the json object and need to update the address field like as given below

 {"Name":"Manu","Age":"25","Address":"XXXX"}

can anyone please tell me how to update the Address details in the JSON using java

My code

JSONObject rec = new JSONObject(data);
String name = rec.getString("Name");
String age  = rec.getString("Age"); 
String add  = rec.getString("Address"); 

now how to add some information to the address field

Update 1

String jsonstring="{Name:Manu,Age:25,Address:''}";
JSONObject object=new JSONObject(jsonstring);
JSONObject childobject=object.getJSONObject("Address");

JSONObject modifiedjson=new JSONObject();
modifiedjson.put("type",childobject.get("type"));
modifiedjson.put("value","newvalue"); 

Exception

Exception in thread "main" org.json.JSONException: JSONObject["Address"] is not a JSONObject.
    at org.json.JSONObject.getJSONObject(JSONObject.java:557)
    at kotouch.Sample.main(Sample.java:59)
Java Result: 1

Solution 1

Parse the JSON and call the particular Key needs to be updated and set the value for the key. Please be more specific.

Create a new JSON Object

private JSONObject Data = new JSONObject;

public Test(){

try {

Data.put("address", username);
    }

catch (JSONException e) {

  // TODO Auto-generated catch block

  e.printStackTrace();
    }
}

Solution 2

If you are using the JsonObject class it is immutable

So i believe you have to duplicate the object and change the value like this:

JSONObject object=new JSONObject(jsonstring);
JSONObject childobject=object.getJSONObject("XXXX");

JSONObject modifiedjson=new JSONObject();
modifiedjson.put("type",childobject.get("type"));
modifiedjson.put("value","newvalue");  // Add new value of XXXX here

Comments

[Henry]

Please explain what update a Json object means for you. Read the Json, add some information and write it back out or what?

[mvreijn]

You have to be a little more specific in regard to the steps you need.

[Admin]

after reading the json object and i need to update the address field.

[njzk2]

I don't see what is unclear with the error message and all.

[njzk2]

(you do see there is no type in you address field, which is a string and not a json object, right ?)

[saurabheights]

This: "{Name:Manu,Age:25,Address:''}"; is not a json string. This one is json: "{\"Name\":\"Manu\",\"Age\":25,\"Address\":\"\"}"

[Admin]

i'm getting exception..............when i tried that ......see my update

[Rawa]

What is your exception? Please update the question.

[Admin]

see my update.....................

[Rawa]

simply using docs.oracle.com/javaee/7/api/javax/json/… should cover that case.

[Admin]

sir why i'm getting that exception.......;

[Rawa]

Your address field is empty, if it has no value it should be null or non-existing.

[Admin]

i 've put some values in address field still its giving the same exception

[Rawa]

How do you set the data string? when creating a string with qoutation signs you need to use backslash. I would suggest that you print to make sure that your string really are correct.