Communicating with server from an Applet.

Question

Hi, i've written a tetris game in an applet.
But i want some way of saving the high scores of everyone on the server.
Is they anyway to communicate the final score back to the server from the applet?
I tried saving the scores to a text file but apparently the file would appear on the client.

Answer 1

Here is some code that you may find useful. This works for the more flexible serialized object approach. For a query string, you would simply do a post on the servlet with the appropriate URL that includes the query string. However, I have found the following serialized object approach to be more convenient.
import java.net.*;
import java.io.*;
This function sends an "AppletRequest" object to the servlet and gets the response back from the servlet in the form of a "ServletResponse" object.
protected static ServletResponse talkToServlet(AppletRequest aReq) {
ServletResponse sr = new ServletResponse();
try {
// Replace the following URL by the URL of your servlet
servletURL = new URL("http://myservleturl/");
servletConn = servletURL.openConnection();
servletConn.setUseCaches (false);
servletConn.setRequestProperty("Content-Type",
"application/octet-stream");
servletConn.setDoInput(true);
servletConn.setDoOutput(true);
} catch (MalformedURLException ex) {
System.out.println("MalformedURLException"+ex.getMessage());
} catch (IOException ex) {
System.out.println("IOException"+ex.getMessage());
} catch (Exception ex) {
System.out.println ("GeneralException: " + ex.getMessage());
try {
outputToServlet = new ObjectOutputStream(servletConn.getOutputStream());
outputToServlet.writeObject(aReq);
outputToServlet.flush();
outputToServlet.close();
} catch (Exception ex) {
System.out.println("GeneralException1: "+ex.getMessage());
try {
try{
inputFrServlet = new ObjectInputStream(servletConn.getInputStream());
sr = (ServletResponse) inputFrServlet.readObject();
inputFrServlet.close();
} catch (EOFException ex) {
System.out.println("EOFException: "+ex.getMessage());
} catch (IOException e) {
System.out.println("IOException: "+e.getMessage());
e.printStackTrace();
} catch (ClassNotFoundException e) {
System.out.println("ClassNotFoundException: "+e.getMessage());
} catch (Exception e) {
System.out.println("GeneralException2: "+e.getMessage());
return(sr);