Applet Java communication

Question

I'm passing parameters from an applet to a servlet. This servlet takes these values and create a file and write values to the file.
My applet code:
java.net.URL host = this.getCodeBase();
java.net.HttpURLConnection hConn = null;
java.io.DataInputStream din= null;
java.io.DataOutputStream dout = null;
java.net.URL servURL=null;
try {
servURL=new java.net.URL("http://localhost:8084/marks/createMarks");
} catch (MalformedURLException ex) {
javax.swing.JOptionPane.showMessageDialog(getContentPane(),ex.getMessage(),"URL Error",javax.swing.JOptionPane.ERROR_MESSAGE);
javax.swing.JOptionPane.showMessageDialog(getContentPane(),servURL.toString(),"Mark Listener URL",javax.swing.JOptionPane.INFORMATION_MESSAGE);
try {
hConn = (HttpURLConnection) servURL.openConnection();
hConn.setRequestMethod("POST");
} catch (IOException ex) {
javax.swing.JOptionPane.showMessageDialog(getContentPane(),ex.getLocalizedMessage(),"URL Connection",javax.swing.JOptionPane.ERROR_MESSAGE);
hConn.setDoInput(true);
hConn.setDoOutput(true);
hConn.setUseCaches(false);
hConn.setRequestProperty("Content-Type", "text/plain");
try {
dout = new java.io.DataOutputStream(hConn.getOutputStream());
} catch (IOException ex) {
javax.swing.JOptionPane.showMessageDialog(getContentPane(),ex.getLocalizedMessage(),"URL Outputstream",javax.swing.JOptionPane.ERROR_MESSAGE);
String content = null;
try {
content = "addr=" + java.net.URLEncoder.encode(address,"UTF-8") +
"pno=" + java.net.URLEncoder.encode(String.valueOf(CURR_PAGE),"UTF-8") +
"x1=" + java.net.URLEncoder.encode(String.valueOf(finalX),"UTF-8") +
"y1=" + java.net.URLEncoder.encode(String.valueOf(finalY),"UTF-8") +
"x2=" + java.net.URLEncoder.encode(String.valueOf(width),"UTF-8") +
"y2=" + java.net.URLEncoder.encode(String.valueOf(height),"UTF-8")+
"text=" + java.net.URLEncoder.encode(String.valueOf(text),"UTF-8") ;
} catch (UnsupportedEncodingException ex) {
javax.swing.JOptionPane.showMessageDialog(getContentPane(),ex.getLocalizedMessage(),"Unsupported Encoding",javax.swing.JOptionPane.ERROR_MESSAGE);
try {
dout.writeBytes(content);
dout.flush();
dout.close();
} catch (IOException ex) {
javax.swing.JOptionPane.showMessageDialog(getContentPane(),ex.getLocalizedMessage(),"Writing Content to Server",javax.swing.JOptionPane.ERROR_MESSAGE);
My servlet code:
String dirname = System.getProperty("user.home")+java.io.File.separator+"rahul1";
     File dir = new File(dirname);
     String content = null;
     String xs = "<start>";
     String ys = "<end>";
     if(!dir.exists() )
                    dir.mkdirs();
File f1 = new File(dir,fname);
     try {
                    String addr=request.getParameter("addr");
String pno=request.getParameter("pno");
String x1=request.getParameter("x1");
String y1=request.getParameter("y1");
String x2=request.getParameter("x2");
String y2=request.getParameter("y2");
String text=request.getParameter("text");
String content1=request.getParameter("content");
                    //BufferedWriter out = new BufferedWriter(new FileWriter(f1));
                    PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(f1)));
                    out.println(xs);
                    out.println(addr);
out.println(pno);
out.println(x1);
out.println(y1);
out.println(x2);
out.println(y2);
out.println(text);
out.println(content1);
                    out.println(ys);
out.flush();
                    out.close();
          catch (IOException e) {System.out.println("Error Writing File -> " + e.toString());     }
But my servlet is neither taking the values nor is it writing to files How can i get the values to servlet

Answer 1

yaa this solved my problem a little bit(now its
writing to the file, but null values its not taking
the values passed by applet. Is my approach right in
retrieving values?Retrieving looks fine, but look again at how you're sending them. You're not sending any delimiters, just a long string like this:
pno=ax1=by1=c
How would it know when pno ends and x1 starts? As far as it's concerned, you sent this as the "pno" parameter:
pno="ax1=by1=c"
You need to send linefeed delimeters between the parameters. Please go research the web on how to properly POST data.