How can I convert String to JSON object in Java

: You can use Google gson for converting string to json java

for more details

The object in examples:

class BagOfPrimitives {

  private int value1 = 1;

  private String value2 = "abc";

  private transient int value3 = 3;

  BagOfPrimitives() {

    // no-args constructor

  }

}

Serialization

BagOfPrimitives obj = new BagOfPrimitives();

Gson gson = new Gson();

String json = gson.toJson(obj); 

==> json is {"value1":1,"value2":"abc"} 

Note that you can not serialize objects with circular references since that will result in infinite recursion.

(Deserialization)

BagOfPrimitives obj2 = gson.fromJson(json, BagOfPrimitives.class);  

==> obj2 is just like obj

Another example of Gson:

Gson is easy to learn and implement, you need to know is the following two methods:

-> toJson() – convert java object to JSON format

-> fromJson() – convert JSON into java object

import com.google.gson.Gson;

public class TestObjectToJson {

  private int data1 = 100;

  private String data2 = "hello";

  public static void main(String[] args) {

      TestObjectToJson obj = new TestObjectToJson();

      Gson gson = new Gson();

      //convert java object to JSON format

      String json = gson.toJson(obj);

      System.out.println(json);

  }

}

Output

{"data1":100,"data2":"hello"}