convert JSON from ajax request to JSON object in java

Question

This is the form data

selectedDtlId: [{"id":"3","isReviewed":true,"notes":"notes asdf test add 2"},{"id":"2","isReviewed":true,"notes":""},{"id":"1","isReviewed":true,"notes":""}]
isReviewedAll: true
notesAll:

Upon running the below code in the Controller

Gson gson = new Gson();
gson.toJson(request.getParameter("selectedDtlId"));

response

"[{\"id\":\"3\",\"isReviewed\":true,\"notes\":\"notes asdf test add 2\"},{\"id\":\"2\",\"isReviewed\":true,\"notes\":\"\"},{\"id\":\"1\",\"isReviewed\":true,\"notes\":\"\"}]"

Expected resoponse

[
   {
      "id": "3",
      "isReviewed": true,
      "notes": "notes asdf test add 2"
   },
   {
      "id": "2",
      "isReviewed": true,
      "notes": ""
   },
   {
      "id": "1",
      "isReviewed": true,
      "notes": ""
   }
]

Emir Kuljanin · Accepted Answer · 2018-07-10 18:07:50Z

4

You're calling toJson when you should be calling fromJson:

gson.fromJson(request.getParameter("selectedDtlId"), JsonElement.class);

Or if you have a model:

gson.fromJson(request.getParameter("selectedDtlId"), MyModel.class);

edited Jul 10, 2018 at 18:07

answered Jul 10, 2018 at 18:01

Emir Kuljanin

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Comments

Oguzcan · Accepted Answer · 2018-07-10 18:26:36Z

2

You should map it to a Class. (Also you are calling toJson when you should call fromJson)

Main

import com.google.gson.Gson;

public class Main {

  public static void main(String[] args) {
    String jsonInString = "[{\"id\":\"3\",\"isReviewed\":true,\"notes\":\"notes asdf test add 2\"},{\"id\":\"2\",\"isReviewed\":true,\"notes\":\"\"},{\"id\":\"1\",\"isReviewed\":true,\"notes\":\"\"}]";
    Gson gson = new Gson();

    SelectedDtlId[] selectedDtlIds = gson.fromJson(jsonInString, SelectedDtlId[].class);

    for (SelectedDtlId selectedDtlId : selectedDtlIds) {
      System.out.println("id: " + selectedDtlId.getId());
      System.out.println("notes: " + selectedDtlId.getNotes());
      System.out.println("isReviewed: " + selectedDtlId.isReviewed());
    }
  }

}

Model

import com.google.gson.annotations.SerializedName;

public class SelectedDtlId {

  @SerializedName("id")
  private int id;
  @SerializedName("isReviewed")
  private boolean isReviewed;
  @SerializedName("notes")
  private String notes;

  // getters & setters
}

the result should be:

id: 3
notes: notes asdf test add 2
isReviewed: true
id: 2
notes: 
isReviewed: true
id: 1
notes: 
isReviewed: true

answered Jul 10, 2018 at 18:26

Oguzcan

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1 Comment

Digvijay Over a year ago

thanks Oguzcan, for detailed explanation. Your SelectedDtlId[] selectedDtlIds = gson.fromJson(jsonInString, SelectedDtlId[].class); helped me.

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