Hi,
I am trying to get a applet to communicate with my servlet. I am able to receive from the servlet. But the message I am trying to send is not reaching the servlet.

Can someone help? Am I doing something wrong?

I call the applet's Refresh() function.

This is the (applet) code for the Refresh function
-----------------
    public void Refresh()
        throws MalformedURLException, IOException
    {
       String cr = "\r\n";
       URL url = new URL(getCodeBase(), "/servlet/ExcelServlet");
       genExceptions = url.toString();
       URLConnection con = url.openConnection();
       con.setUseCaches(false);
       con.setDoInput(true );
       con.setDoOutput (true);
       con.connect();
       try
       {
            OutputStream out = con.getOutputStream();
            InputStream in = con.getInputStream();

            DataOutputStream outputStream;
            outputStream = new DataOutputStream( out );

            outputStream.writeUTF( "POST /servlet/ExcelServlet HTTP/1.0" + cr );
            outputStream.writeUTF( "Content-Length: 15" + cr + cr );
            outputStream.writeUTF( "Hi there How are you" + cr );
            
            DataInputStream textStream;
            textStream = new DataInputStream(in);
            dispString = textStream.readLine();
       }
       catch( Exception exception)
       {
           genExceptions = exception.toString();
       }
       repaint();
    }
-----------------

This is the servlet code snippet
-----------
public void doPost(HttpServletRequest request,
                      HttpServletResponse response)
    throws IOException, ServletException
{

System.out.println( "Get" );
response.setContentType("text/plain");
PrintWriter out = response.getWriter();
out.println( "Myfile.xls");
BufferedReader in = request.getReader();

Enumeration enu = request.getHeaderNames();
while ( enu.hasMoreElements() )
{
    String Head = (String) enu.nextElement();
    System.out.println( Head );
}

System.out.println( "Excel Servlet Length : " + request.getContentLength() );

}
-----------

Trap your request in the doGet method of your servlet. Try this code for HTTP POST:

  DataOutputStream printout;
  BufferedReader rdr;

  String u = <your Page>;
  URL url = new URL(u);
  URLConnection urlConn = url.openConnection();
  urlConn.setDoInput(true);
  urlConn.setDoOutput(true);
   urlConn.setUseCaches(false);
   urlConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
    printout = new DataOutputStream(urlConn.getOutputStream());
   
String P = "P1=" + URLEncoder.encode(<val1>) + "&P2=" + URLEncoder.encode(<val2>);

            printout.writeBytes(P);
            printout.flush();
            printout.close();
            rdr = new BufferedReader(new InputStreamReader(urlConn.getInputStream()));
            retVal = "";
            while (null != ((str = rdr.readLine()))) {
                retVal = retVal + str;
            }
            rdr.close();

Check http://www.javagalaxy.com there are examples on Applet Servlet communication.

Uma