Properties object values are null

[fedai gandjaliyev]

Hello!
I'm trying to establish an applet-servlet communication where I use the Properties
object to pass parameters from the applet to the servlet!
The reason of using the Properties object is that I pass the password as a parameter and it's shown in the address bar of the servlet generated page!
The following works fine
The applet part

  ServletURL = new URL(servletPath +    ServletParameters);
                    connection = ServletURL.openConnection();
                    connection.setDoInput(true);
                    connection.setUseCaches(false);
 
                    BufferedInputStream stream = new BufferedInputStream(connection.getInputStream());
                    Properties table = new Properties();
                    table.load(stream);
                    stream.close();

for which the servlet part is this

    //do some actions
    try{
 
                   OutputStream ous = new BufferedOutputStream(response.getOutputStream());
                   table.store(ous, null);
                   ous.close();
                   ous.flush();
 
                }catch(Exception exc){
                  SendError(response, exc.getMessage());
                }

This works fine. But in the following combination of the applet-servet communication
the values of the Properties object are null!
Here is the applet part

                    Properties table = new Properties();
                    table.put("name"          ,  name);
                    table.put("username"      ,  username);
                    table.put("Date"          ,  getCurrentDate());
                    table.put("mobile"        ,  mobile);                   
 
                    try{
 
                        ServletURL = new URL(servletPath);
                        connection = ServletURL.openConnection();
                        connection.setDoOutput(true);
                        connection.setUseCaches(false);
 
                        OutputStream os = new BufferedOutputStream(connection.getOutputStream());
                        table.store(os, null);
                        os.close();
                        os.flush();
 
                        getAppletContext().showDocument(ServletURL, "_blank");
 
                    }catch(Exception exc){
 
                        messageLabel.setText(exc.getMessage());
                        ServletURL = null;
 
                    }

And here is the doGet of the servlet in reply to the applet

try{
 

               InputStream is = new BufferedInputStream(request.getInputStream());
               Properties table = new Properties();
               table.load(is);
               is.close();
 
               username = table.get("username").toString();               
               Name = table.get("name").toString();
               ActionDate = table.get("Date").toString();
               PhoneNumber = table.get("mobile").toString();
}catch(Exception exc){
}

The size of the the Properties object "table" is 0 in this case and the values are null!
Please help!
Thank you!

[Joe Ess]

HTTP is a request-response protocol. By making a setting up a request but not reading in the response, you are not fulfilling your part of the protocol so your request never gets sent. You actually have two requests in your code:

    
 // request 1
    ServletURL = new URL(servletPath);
    connection = ServletURL.openConnection();
    . . .
 // request 2
    getAppletContext().showDocument(ServletURL, "_blank");

Request 1 never gets sent because you don't read the response. Request 2, which actually gets sent by the browser navigating away from your applet, doesn't have the properties object serialized in the request. That's the one being processed by your servlet.

[fedai gandjaliyev]

Thank you very much for the explanation!