CODEWITHSUNDEEP
javajsonplayframework-2.0java-8gson
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Reputation: 210

Create JSON object in Java8 using com.google.code.gson

I am trying to create a JSON Object using com.google.code.jso in JAVA 8. I have a list of objects and i am iterating through them. The object is as:

public class MyObject {
    private String name, status, cause, id;

    public String getName() {
        return name;
    }

    public String getStatus() {
        return status;
    }

    public String getCause() {
        return cause;
    }

    public String getId() {
        return id;
    }

}

I have a list of above objects and i am trying to convert them to JSON using the below (the relevant code):

import com.google.gson.JsonObject;

JsonObject status = new JsonObject();
for (MyObject obj : objectLists){
            status.add(obj.getId(),
                    new JsonObject()
                            .add("Name: ", obj.getName())
                            .add("Status: ", obj.getStatus())
                            .add("Cause: ", obj.getCause())
            );
        }

I was hoping to get a JSON of the following form:

{

  "0 (this is the id i get from myObject.getId())": {
    "name": The name i get from myObject.getName(),
    "Status": The status from myobject.getStatus(),
    "cause": The status from myobject.getCause()
  },
 "1": {
    "name": "myname",
    "Status": "mystatus",
    "cause": "cause"
  }
}

So I have 2 question.

  1. I am getting an error in creating the Json object. Wrong 2nd argument type. Found: 'java.lang.String', required: 'com.google.gson.JsonElement' I understand that i have to change the second parameter but i could not find in the docs how to do that.

  2. How can i pretty print this.

Thanks

Upvotes: 2

Views: 3541

Answers (3)

alaster
alaster

Reputation: 4181

You used wrong method: JsonObject.addProperty(), not JsonObject.add()

JsonObject.add(String, JsonElement) - adds nested json element to your object:

{
    "root": {
        "nested": {}
    }
}

JsonObject.addProperty(String, String) - adds property to your object (it may be any primitive or String):

{
    "root": {
        "property": "some string"
    }
}

Upvotes: 3

Nayanjyoti Deka
Nayanjyoti Deka

Reputation: 419

Why not using this instead. 

Gson.toJson(obj);

Upvotes: 2

Robin Krahl
Robin Krahl

Reputation: 5308

You should wrap your strings in JsonPrimitive objects, for example:

new JsonObject().add("Name: ", new JsonPrimitive(obj.getName()));

To enable pretty printing, you have to use GsonBuilder.setPrettyPrinting():

Gson gson = new GsonBuilder().setPrettyPrinting().create();
System.out.println(gson.toJson(obj));

Upvotes: 1

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