Convert JSONObject to Java

Question

I made a call to relax in the service and saved the response in JSONObject . However, I am trying to convert it to a class object and get errors. Here is my code:

 RestOperations operations = /*initalize*/; String body = /*build request body*/; String resourceResponse = operations.postForObject(/* url */, body, String.class); JSONObject jsonResponse = new JSONObject(resourceResponse); UserIdentifier userIdentifier = (UserIdentifier) jsonResponse.get("userIdentifier"); 

Here is the answer:

 { "userIdentifier": { "uid": "ee63a52cda7bf411dd8603ac196951aa77", "code": "63a5297e7bf411dd8603ac196951aa77", "retailId": "860658787", "pointOfEntry": "RETAIL" }, "resultCode": true } 

And this is what the UserIdentifier class looks like:

 public class UserIdentifier { private String uid; private String code; private String retailId; public UserIdentifier() { } public UserIdentifier(String uid, String code, String retailId) { this.uid = uid; this.code = code; this.retailId = retailId; } public String getuid() { return uid; } public void setuid(String uid) { this.uid = uid; } public String getcode() { return code; } public void setcode(String code) { this.code = code; } public String getretailId() { return retailId; } public void setretailId(String retailId) { this.retailId = retailId; } } 

But I get the error:

 java.lang.ClassCastException: org.json.JSONObject cannot be cast to app.identity.UserIdentifier 

What am I doing wrong?

Edit 1: Here's an attempt to use gson from the answers:

 Gson gson = new GsonBuilder().create(); String body = /*build request body*/; String resourceResponse = operations.postForObject(/* url */, body, String.class); JSONObject jsonResponse = new JSONObject(resourceResponse); UserIdentifier userIdentifier = gson.fromJson(jsonResponse.getString("userIdentifier"), UserIdentifier.class); 

But I get the error:

 org.json.JSONException: JSONObject["userIdentifier"] not a string. at org.json.JSONObject.getString(JSONObject.java:658) ~[json-20140107.jar:na] 

Answer 1

Found out what the problem is. You need to extract jsonobject instead of getting the string. Here is the line where the problem is fixed:

 UserIdentifier userIdentifier = gson.fromJson(jsonResponse.getJSONObject("userIdentifier").toString(), UserIdentifier.class); 

Answer 2

You may need to use gson

  class Name{ String resultCode; UserIdentifier useridentifier; //getters } Gson gson=new Gson(); Name name=gson.fromJson(jsonString,Name.class); 

Answer 3

Use the Gson Library

 Gson gson=new GsonBuilder().create(); UserIdentifier userIdentifier=gson.fromJson(jsonString,UserIdentifier.class); 

In your case jsonString resourceResponse

More ... Gson Documentation

Answer 4

the thing is that you cannot discard the object returning to the get method, like this, one of the solutions could be this, using the GSON library:

 RestOperations operations = /*initalize*/; String body = /*build request body*/; Gson gson = new Gson(); String resourceResponse = operations.postForObject(/* url */, body, String.class); JSONObject jsonResponse = new JSONObject(resourceResponse); String jsonUserIdentifier = jsonResponse.getString("userIdentifier"); UserIdentifier userIdentifier = gson.fromJson(jsonUserIdentifier , UserIdentifier.class);