user2002920 user2002920 - 2 months ago 7
Java Question

how to send a string to a servlet from javascript using xmlhttprequest

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.

Answer Source

Client Code :

 var toServer = myJSONObject.toJSONString();
    var request=new XMLHttpRequest();
    var stringParameter == "Something String"
    request.open("POST", "http://localhost:7001/APToolbar/Main_servlet?stringParameter="+stringParameter , true);
    request.send(toServer);

following string will

http://localhost:7001/APToolbar/Main_servlet?stringParameter="+stringParameter

append your parameter in url

and at server side

Server code :

String output = request.getParameter("stringParameter");
System.out.println(output);

access parameter by using stringParameter name