Encoding and Decoding JSON in Java

JSON ProgramsI( Encoding and Decoding in Java)

Encoding JSON in Java

Following is a simple example to encode a JSON object using Java JSONObject which is a subclass of java.util.HashMap. No ordering is provided. If you need the strict ordering of elements, use JSONValue.toJSONString ( map ) method with ordered map implementation such as java.util.LinkedHashMap.

 

import org.json.simple.JSONObject;

class JsonEncodeDemo {

    public static void main(String[] args){

      JSONObject obj = new JSONObject();

       obj.put("name", "compsciflix");

      obj.put("num", new Integer(100));

      obj.put("balance", new Double(2000.58));

      obj.put("is_vip", new Boolean(true));

       System.out.print(obj);

   }

}

On compiling and executing the above program the following result will be generated −

{"balance": 2000.58, "num":100, "is_vip":true, "name":"compsciflix"}

Following is another example that shows a JSON object streaming using Java JSONObject −

import org.json.simple.JSONObject;

 

class JsonEncodeDemo {

 

   public static void main(String[] args){

      JSONObject obj = new JSONObject();

 

      obj.put("name","compsciflix");

      obj.put("num",new Integer(100));

      obj.put("balance",new Double(1000.1));

      obj.put("is_vip",new Boolean(true));

 

      StringWriter out = new StringWriter();

      obj.writeJSONString(out);

      

      String jsonText = out.toString();

      System.out.print(jsonText);

   }

}

On compiling and executing the above program, the following result is generated −

{"balance": 1000.1, "num":100, "is_vip":true, "name":"compsciflix"}