Servlets and Applets

[Chaveen Ekanayake]

I m designing a chat program for web. since I haven't had much experience I designed chat interface by HTML. Then I realized with HTML only inputs can be made to server but no outputs from server ( I want to show the messages of chatters on a textarea ). Now I am going to use Applet instead of HTML form. But I don't know how to put a connetion with servlets for Applet ( or can I ??). Is there anything that can be used other than HTML or Applet?? (ie :- JSP )

Please help
[ September 04, 2008: Message edited by: Bear Bibeault ]

[Ulf Dittmer]

An applet can communicate with a server (servlet or otherwise, doesn't matter) using the java.net.URLConnection class. You may also want to look into the Apache Commons HttpClient package, which provides more features for HTTP communication.

It would also be possible to use raw TCP/IP sockets using the java.net.Socket class (and a corresponding ServerSocket on the server). Come to think of it, that would be a better fit than using HTTP.

These days it would be more natural to do this in HTML and JavaScript using AJAX technologies, though. That's what the XMLHttpRequest JavaScript object does (which is supported by all major browsers).

[elay Raja]

Applet can connect with servlet using HttpURLConnection.
You have to make connection to servlet using HttpURLConnection API to a servlet.For example...the above code will be written in Applet

URL url=new URL("http://localhost:8080/Chat/ChatServlet");
HttpUrlConnection con=url.openConnection();
con.setDoInput(true);
OutputStream out=con.getOutputStream();
out.write(data);
You can wrap the outputstream to any stream. Try this.If you can't get it,i will send the code in detail.
View this Link:http://www.j-nine.com/pubs/applet2servlet/Applet2Servlet.html

[Chaveen Ekanayake]

thanks man