Help with Proxy Server

Hi!All
I have developed a Chat Application which has to be put up at the Clients
place over the intranet,i have developed it using the Avalon FrameWork for the server side and applet on the Client side.Everything works perfectly,the application also runs perfectly,im using the port 4000 for communication,now the problem is that since at the Clients place we have a Proxy Server which only allows port 80 and bards all other port so my appliaction will not perform there at all,i was wondering is there any other way out of this problem if anyone has ever been through this problem please let me know at theearliest.Help needed urgently.Awaiting reply.
Thanx.

Try routing the communication from your end from port 4000 to port 80 using some sort of Proxy DLL if u are using IIS as the web server, it comes handy with such a thing.
Using BEA Weblogic 6.1, i have been able to do so. My web server is IIS and the app server being Weblogic, both run on different ports.
The user access the website from port 80 which is handled by IIS and then the request is funneled to Weblogic via the Proxy DLL on a specified port where my weblogic is running.
This works fine with me. Try using that am something should work.

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                   ServerSocket serverSocket = new ServerSocket(8000);
                   jta.append("MultiThreadServer started at " + new Date() + '\n');
                   // Number a client
                   int clientNo = 1;
                   while (true) {
                        // Listen for a new connection request
                        Socket connectToClient = serverSocket.accept();
                        // Display the client number
                        jta.append("Starting thread for client " + clientNo +
                             " at " + new Date() + '\n');
                        // Find the client's host name, and IP address
                        InetAddress clientInetAddress =
                             connectToClient.getInetAddress();
                        jta.append("Client " + clientNo + "'s host name is "
                             + clientInetAddress.getHostName() + "\n");
                        jta.append("Client " + clientNo + "'s IP Address is "
                             + clientInetAddress.getHostAddress() + "\n");
                        // Create a new thread for the connection
                        HandleAClient thread = new HandleAClient(connectToClient);
                        cn = clientNo;
                        // Start the new thread
                        thread.start();
                        // Increment clientNo
                        clientNo++;
              catch(IOException ex) {
                   System.err.println(ex);
         // Inner class
         // Define the thread class for handling new connection
         class HandleAClient extends Thread {
              private Socket connectToClient; // A connected socket
              // Construct a thread
              public HandleAClient(Socket socket) {
                   connectToClient = socket;
              // Run a thread
              public void run() {
                   try {
                        // Create data input and output streams
                        DataInputStream isFromClient = new DataInputStream(
                             connectToClient.getInputStream());
                        DataOutputStream osToClient = new DataOutputStream(
                             connectToClient.getOutputStream());
                        osToClient.writeDouble(cn);
                        // Continuously serve the client
                        while (true) {
                             // Receive radius from the client
                             double radius = isFromClient.readDouble();
                             // Compute area
                             double area = radius*radius*Math.PI;
                             // Send area back to the client
                             osToClient.writeDouble(area);
                             jta.append("radius received from client: " +
                                  radius + '\n');
                             jta.append("Area found: " + area + '\n');
                   catch(IOException e) {
                        System.err.println(e);
    }And here is the Client Program code, note that the sending of text does not yet work here either.
    // Client.java: The client sends the input to the server and receives
    //           result back from the server
    import java.io.*;
    import java.net.*;
    import java.util.*;
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    import java.applet.*;
    public class Client extends JFrame implements ActionListener {
         // Text field for receiving radius
         private JTextField jtf = new JTextField(40);
         // Text area to display contents
         private JTextArea jta = new JTextArea();
         // IO streams
         DataOutputStream osToServer;
         DataInputStream isFromServer;
         public static void main(String[] args) {
              new Client();
         public Client() {
              // Ask the user for a name
              String s = JOptionPane.showInputDialog
                   (null, "Please Enter Your Name:", "ZedX Web Messenger", JOptionPane.QUESTION_MESSAGE);
              // Panel p to hold the label and text field
              JPanel p = new JPanel();
              p.setLayout(new BorderLayout());
              p.add(new JLabel("Enter Text"), BorderLayout.WEST);
              p.add(jtf, BorderLayout.CENTER);
              p.add(new JButton("Go"), BorderLayout.EAST);
              jtf.setHorizontalAlignment(JTextField.LEFT);
    //          jta.editable(false);
              getContentPane().setLayout(new BorderLayout());
              getContentPane().add(p, BorderLayout.NORTH);
              getContentPane().add(new JScrollPane(jta), BorderLayout.CENTER);
              jtf.addActionListener(this); // Register listener
              String user = "Client";
              setTitle(user);
              setSize(500,500);
              setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
              setVisible(true); // It is necessary to show the frame here!
              try {
                   // Create a socket to connect to the server
                   Socket connectToServer = new Socket("10.0.5.39", 8000);
                   // Create an input stream to receive data from the server
                   isFromServer = new DataInputStream(
                        connectToServer.getInputStream());
                   // Create an output stream to send data to the server
                   osToServer = new DataOutputStream(connectToServer.getOutputStream());
                   // Send client Name to server
                   // Get client number and name from server
                   double cn = isFromServer.readDouble();
                   user = user + " " + cn + ":  " + s;
                   setTitle(user);
              catch (IOException ex) {
                   jta.append(ex.toString() + '\n' + "Administrator must be offline, try again later.");
         public void actionPerformed(ActionEvent e) {
              String actionCommand = e.getActionCommand();
              if (e.getSource() instanceof JTextField) {
                   try {
                        // Get the text from the text field
                        String radius = jtf.getText();
                        // Send the text to the server
                        osToServer.println(radius);
                        osToServer.flush();
                        // Get text from the server
                        double area = isFromServer.readDouble();
                        // Display to the text area
                        jta.append("You Sent: " + radius + "\n");
                        jta.append("Server" + area + '\n');
                   catch (IOException ex) {
                        System.err.println(ex);
    }

    bump

  • Help with Client/Server communication

    Im working on a project for university, and one aspect of it is downloading files from a remote computer.
    The majority of my project so far has been using RMI only, for browsing the remote computer, deleting files, renaming files, creating new directories and searching for files. All of this is done via a GUI client, with a server running on the server machine.
    Ive now reached the part where I'll need to implement the downloading of files. I want the user to select a file from within the GUI and click download, and get it off the server.
    I dont need any help with event handlers or getting the contents of the remote computer or anything of that sort.
    Consider when I have the name of the file that I want to download from the client.
    Im having trouble understanding how exactly its going to work. Ive seen examples of file transfer programs where the user types in the name of the file in the command line which they want to download. But my implementation will differ.
    Every time the user clicks the button, I have to send to the server the name of a different file which will need to be downloaded.
    I imagine in the event handler for the Download button I'll be creating a new socket and Streams for the download of the file that the user wants. But how am I to send to the client a dynamic file name each time when the user tries to download a different file?
    I am a bit new at this, and Ive been searching on the forums for examples and Ive run through them, but I think my situation is a bit different.
    Also, will RMI play any part in this? Or will it purely be just Socket and Streams?
    I'll also develop an Upload button, but I imagine once I get the Download one going, the Upload one should be much harder.
    Any ideas and help would be appreciated.

    Hi
    I'm no RMI expert... and I did not understand your question very well....
    I think you should do this procedure:
    you should send a request for the file from the client to the server . then a new connection between the two machines should be made which will be used to send the file.
    by using UDP you will achive it quite nicely...
    //socket - is your TCP socket  you already use on the client...
    //out - socket's output stream
    byte [] b=new String("File HelloWorld.java").getBytes();
    // you should use a different way for using this rather than using strings...
    out.write(b);
    DatagramSocket DS=new DatagramSocket(port);
    DS.recieve(packet); //the data is written into the packet...on the server side you should...
    //socket - is your TCP socket  you already use on the server...
    //in - socket's input stream
    byte [] b=new byte[256];
    out.read(b);
    /*Here you check what file you need to send to the client*/
    DatagramSocket DS=new DatagramSocket(server_port);
    byte [] data=//you should read the file and translate it into bytes and build a packet with them
    DS.send(packet); //the data is in the packet...This way the server sends the required file to the client .....
    I hope it will help, otherwise try being clearier so I could help you...
    SIJP

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