import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;

public class Test {

private static HttpURLConnection getURLConnection(String urlToConnect) throws IOException {
  URL url = new URL(urlToConnect);
  HttpURLConnection httpUrlConnection = (HttpURLConnection) url.openConnection();
return httpUrlConnection;
}

private static HttpURLConnection writeContentTo(String urlToWrite, String content, String requestContentType,
   String method) throws IOException {
  HttpURLConnection httpUrlConnection = getURLConnection(urlToWrite);

  httpUrlConnection.setRequestMethod(method);
  httpUrlConnection.setDoOutput(true);
  httpUrlConnection.setRequestProperty("Content-Type", requestContentType);
  OutputStreamWriter writer = new OutputStreamWriter(httpUrlConnection.getOutputStream());
  writer.append(content);
  writer.flush();
  writer.close();

return httpUrlConnection;
}

private static InputStream getContentStream(HttpURLConnection httpUrlConnection) throws IOException {
int responseCode = httpUrlConnection.getResponseCode();
  InputStream inputStream = null;

if (responseCode >= 200 && responseCode  400) {
   inputStream = httpUrlConnection.getInputStream();
} else {
   inputStream = httpUrlConnection.getErrorStream();
}

return inputStream;
}

private static void printInputStream(InputStream inputStream) throws IOException {
  BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));

  String line = null;

while ((line = br.readLine()) != null) {
   System.out.println(line);
}
}


public static void main(String[] args) throws IOException {
  String url = "urlToWrite";
  String method = "POST";
  String content = "{\"id\" : \"krishna\", \"logonId\" : \"hari\"}"; //you can write any content
  String requestContentType = "application/json";

  HttpURLConnection httpUrlConnection = writeContentTo(url, content, requestContentType, method);
  InputStream inputStream = getContentStream(httpUrlConnection);

  printInputStream(inputStream);

}

}