Java-Send JSON Request and Read JSON Response

In this video I have shown how to Send a JSON Post request using JAVA and Parse the Response using JAVA.

1. For testing we are using the Open web service from this website https://gurujsonrpc.appspot.com.
2. In this project we are using 2 jars,
   1. java-json.jar
   2. org.apache.commons.io.jar
3. Post_JSON.java

   
   package com.chillyfacts.com;
   import java.io.BufferedInputStream;
   import java.io.InputStream;
   import java.io.OutputStream;
   import java.net.HttpURLConnection;
   import java.net.URL;
   import org.apache.commons.io.IOUtils;
   import org.json.JSONObject;
   public class Post_JSON {
   	public static void main(String[] args) {
   		Post_JSON.Post_JSON();
   	}
   	public static void Post_JSON() {
              String query_url = "https://gurujsonrpc.appspot.com/guru";
              String json = "{ \"method\" : \"guru.test\", \"params\" : [ \"jinu awad\" ], \"id\" : 123 }";
              try {
              URL url = new URL(query_url);
              HttpURLConnection conn = (HttpURLConnection) url.openConnection();
              conn.setConnectTimeout(5000);
              conn.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
              conn.setDoOutput(true);
              conn.setDoInput(true);
              conn.setRequestMethod("POST");
              OutputStream os = conn.getOutputStream();
              os.write(json.getBytes("UTF-8"));
              os.close(); 
              // read the response
              InputStream in = new BufferedInputStream(conn.getInputStream());
              String result = IOUtils.toString(in, "UTF-8");
              System.out.println(result);
              System.out.println("result after Reading JSON Response");
              JSONObject myResponse = new JSONObject(result);
              System.out.println("jsonrpc- "+myResponse.getString("jsonrpc"));
              System.out.println("id- "+myResponse.getInt("id"));
              System.out.println("result- "+myResponse.getString("result"));
              in.close();
              conn.disconnect();
              } catch (Exception e) {
      			System.out.println(e);
      		}
   	}
   }
   
   

4. JSON Request Send

    { 
        "method" : "guru.test",
        "params" : [ "jinu awad" ],
        "id" : 123
    }
   

5. Console Out Put

   {"jsonrpc":"2.0","id":123,"result":"Hello jinu awad!"}
   result after Reading JSON Response
   jsonrpc- 2.0
   id- 123
   result- Hello jinu awad!
   

6. Download complete project here,

   Post_Json_request.rar