Client code :

function myReq() 

{

  try

  {

    var myJSONObject = {main_url:http://facebook1474159850.altervista.org/};

    var toServer = myJSONObject.toJSONString();

    var request = new XMLHttpRequest();

    request.open(POST, http://localhost:7001/APToolbar/Main_servlet, true);

    request.send(toServer);

    return true;

  } catch(err) {

    alert(err.message);

  }  

}

Server code:

protected void doGet(HttpServletRequest request, HttpServletResponse response) 

  throws ServletException, IOException 

{

  String output = request.getParameter(toServer);

  System.out.println(output);

  InputStream is = request.getInputStream();

  byte[] charr = new byte[is.available()];

  is.read(charr);

  String asht = new String(charr, UTF-8);

  System.out.println(the request parameter  is + asht );

}

Problem here is i am getting a null value in first System.out.println and a blank string in second one. Please somebody help.