Client Server Socket With GUI

As the name of the forum suggests I am very new to this whole thing.
I am trying to write a client/server socket program that can encrypt and decrypt and has a GUI, can't use JCE or SSL or any built in encryption tools.
I have the code for everything cept the encryption part.
Any help, greatly appreciated,

tnks a million but how do i incorporate that into the following client and server code:
here's the client code:
import java.awt.Color;
import java.awt.BorderLayout;
import java.awt.event.*;
import javax.swing.*;
class SocketClient extends JFrame
          implements ActionListener {
JLabel text, clicked;
JButton button;
JPanel panel;
JTextField textField;
Socket socket = null;
PrintWriter out = null;
BufferedReader in = null;
SocketClient(){ //Begin Constructor
text = new JLabel("Text to send over socket:");
textField = new JTextField(20);
button = new JButton("Click Me");
panel = new JPanel();
panel.setLayout(new BorderLayout());
panel.add("North", text);
panel.add("Center", textField);
panel.add("South", button);
} //End Constructor
public void actionPerformed(ActionEvent event){
Object source = event.getSource();
if(source == button){
//Send data over socket
String text = textField.getText();
     textField.setText(new String(""));
//Receive text from server
     String line = in.readLine();
System.out.println("Text received :" + line);
} catch (IOException e){
     System.out.println("Read failed");
public void listenSocket(){
//Create socket connection
socket = new Socket("HUGHESAN", 4444);
out = new PrintWriter(socket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
} catch (UnknownHostException e) {
System.out.println("Unknown host: HUGHESAN.eng");
} catch (IOException e) {
System.out.println("No I/O");
public static void main(String[] args){
SocketClient frame = new SocketClient();
     frame.setTitle("Client Program");
WindowListener l = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
import java.awt.Color;
import java.awt.BorderLayout;
import java.awt.event.*;
import javax.swing.*;
class SocketServer extends JFrame
          implements ActionListener {
JButton button;
JLabel label = new JLabel("Text received over socket:");
JPanel panel;
JTextArea textArea = new JTextArea();
ServerSocket server = null;
Socket client = null;
BufferedReader in = null;
PrintWriter out = null;
String line;
SocketServer(){ //Begin Constructor
button = new JButton("Click Me");
panel = new JPanel();
panel.setLayout(new BorderLayout());
panel.add("North", label);
panel.add("Center", textArea);
panel.add("South", button);
} //End Constructor
public void actionPerformed(ActionEvent event) {
Object source = event.getSource();
if(source == button){
public void listenSocket(){
server = new ServerSocket(4444);
} catch (IOException e) {
System.out.println("Could not listen on port 4444");
client = server.accept();
} catch (IOException e) {
System.out.println("Accept failed: 4444");
in = new BufferedReader(new InputStreamReader(client.getInputStream()));
out = new PrintWriter(client.getOutputStream(), true);
} catch (IOException e) {
System.out.println("Accept failed: 4444");
line = in.readLine();
//Send data back to client
} catch (IOException e) {
System.out.println("Read failed");
protected void finalize(){
//Clean up
} catch (IOException e) {
System.out.println("Could not close.");
public static void main(String[] args){
SocketServer frame = new SocketServer();
     frame.setTitle("Server Program");
WindowListener l = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
Again help on this is very welcomed

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  • Client server code with errors could some one please help me!!!

    I am using a random access file to design the two interfaces for my client and my server is this the right thing to do? Oh could some one give me some example code of client server interfaces.
    I got an error in the code for the interfaces and I don't know what it is could some one please help me!!
    Heres the error in the code: This is for RegisterCustomer
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    import javax.swing.border.*;
    class RegisterCustomer extends JPanel implements ActionListener
    // Button for registering a customer
    private JButton jbtRegister;
    // Customer information panel
    private CustomerPanel customerPanel; (The error is on this line and it says Field type customer panel is missing)
    // Random access file
    private RandomAccessFile raf;
    Second error: Its in the ViewCustomer:
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    import javax.swing.border.*;
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    class ViewCustomer extends JPanel implements ActionListener
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    private JButton jbtFirst, jbtNext, jbtPrevious, jbtLast;
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    private RandomAccessFile raf = null;
    // Current customer record
    private Customer customer = new Customer();
    // Create a customer panel
    private CustomerPanel customerPanel = new customerPanel(); (its on this line and it says field type CustomerPanel is missing)
    // File pointer in the random access file
    private long lastPos;
    private long currentPos;
    Heres the code for the customerPanel:
    // Customer Panel for displaying Customer information
    import javax.swing.*;
    import javax.swing.border.*;
    import java.awt.*;
    public class customerPanel extends JPanel
         JTextField jtfRegistrationnumber = new JTextField(30);
         JTextField jtfSeatingcapacity = new JTextField(20);
    JTextField jtfStartdateofhire = new JTextField(20);
    JTextField jtfDurationofhire = new JTextField(10);
    JTextField jtfManufacture = new JTextField(20);
    JTextField jtfModel = new JTextField(15);
         JTextField jtfEnginesize = new JTextField(15);
    JTextField jtfCharge = new JTextField(20);
    JTextField jtfMileage = new JTextField(10);
    // Constuct a customer panel
    public customerPanel()
    // Set the panel with line border
    setBorder(new BevelBorder(BevelBorder.RAISED));
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    JPanel p1 = new JPanel();
    p1.setLayout(new GridLayout(3, 1));
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    p1.add(new JLabel("Seating capacity"));
    p1.add(new JLabel("Start date of hire"));
    p1.add(new JLabel("Duration of hire"));
    p1.add(new JLabel("Manufacture"));
    p1.add(new JLabel("Model"));
    p1.add(new JLabel("Engine size"));
    p1.add(new JLabel("Charge"));
    p1.add(new JLabel("Mileage"));
    // Panel jpRegistration number for registration number
    JPanel jpRegistrationnumber = new JPanel();
    jpRegistrationnumber.setLayout(new BorderLayout());
    jpRegistrationnumber.add(new JLabel("Registration number"), BorderLayout.WEST);
    jpRegistrationnumber.add(jtfRegistrationnumber, BorderLayout.CENTER);
    // Panel jpSeating capacity for holding Seating capacity
    JPanel jpSeatingcapacity = new JPanel();
    jpSeatingcapacity.setLayout(new BorderLayout());
    jpSeatingcapacity.add(new JLabel("Seating capacity"), BorderLayout.WEST);
    jpSeatingcapacity.add(jtfSeatingcapacity, BorderLayout.CENTER);
         // Panel jpStart date of hire for holding start date of hire
    JPanel jpStartdateofhire = new JPanel();
    jpStartdateofhire.setLayout(new BorderLayout());
    jpStartdateofhire.add(new JLabel("Start date of hire"), BorderLayout.WEST);
    jpStartdateofhire.add(jtfStartdateofhire, BorderLayout.CENTER);
    // Panel jpDuration of hire for holding Duration of hire
    JPanel jpDurationofhire = new JPanel();
    jpDurationofhire.setLayout(new BorderLayout());
    jpDurationofhire.add(new JLabel("Duration of hire"), BorderLayout.WEST);
    jpDurationofhire.add(jtfDurationofhire, BorderLayout.CENTER);
    // Panel p2 for holding jpRegistration number and jpSeating capacity and start date of hire and duration of hire
    JPanel p2 = new JPanel();
    p2.setLayout(new BorderLayout());
    p2.add(jpRegistrationnumber, BorderLayout.WEST);
    p2.add(jpSeatingcapacity, BorderLayout.CENTER);
    p2.add(jpStartdateofhire, BorderLayout.CENTER);
    p2.add(jpDurationofhire, BorderLayout.CENTER);
    // Panel p3 for holding jtfManufacture and p2
    JPanel p3 = new JPanel();
    p3.setLayout(new BorderLayout());
    p3.add(jtfManufacture, BorderLayout.CENTER);
    p3.add(p2, BorderLayout.EAST);
    // Panel p4 for holding jtfModel, jtfEngine size, charge and mileage and p3
    JPanel p4 = new JPanel();
    p4.setLayout(new GridLayout(3, 1));
    // Place p1 and p4 into customerPanel
    setLayout(new BorderLayout());
    add(p1, BorderLayout.WEST);
    add(p4, BorderLayout.CENTER);
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    public Customer getCustomer()
    return new Customer(jtfRegistrationnumber.getText().trim(),
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    public void setCustomer(Customer s)
    Could someone please help me and tell me what these two errors mean and how I could get rid of them

    Can some one take a look at this code and tell me how to get all my jlabels to line up alone side their jtf.
    Because it looks like this the picture in the attached file and this is the code for it:
    public customerPanel()
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    setBorder(new BevelBorder(BevelBorder.RAISED));
    // Panel p1 for holding labels Name, Street, and City
    JPanel p1 = new JPanel();
    p1.setLayout(new GridLayout(5, 1));
    p1.add(new JLabel("Registration Number:"));
    p1.add(new JLabel("Seating Capacity:"));
    p1.add(new JLabel("Engine Size:"));
    p1.add(new JLabel("Start date of hire"));
    p1.add(new JLabel("Duration of hire"));
    JPanel p2 = new JPanel();
    p2.setLayout(new GridLayout(5, 1));
    //JPanel p3 = new JPanel();
    //p3.add(p1, BorderLayout.WEST);
    //p3.add(p2, BorderLayout.NORTH);
    JPanel p4 = new JPanel();
    p4.setLayout(new GridLayout(4, 1));
    p4.add(new JLabel("Manufacture:"));
    p4.add(new JLabel("Model:"));
    p4.add(new JLabel("Mileage:"));
    p4.add(new JLabel("Charge:"));
    JPanel p5 = new JPanel();
    p5.setLayout(new GridLayout(4, 1));
    // JPanel p6 = new JPanel();
    // p6.setLayout(new BorderLayout());
    // p6.add(p4, BorderLayout.SOUTH);
    // p6.add(p5, BorderLayout.EAST);
    // Place p1 and p4 into CustomerPanel
    setLayout(new BorderLayout());
    add(p1, BorderLayout.WEST);
    add(p2, BorderLayout.NORTH);
    add(p4, BorderLayout.SOUTH);
    add(p5, BorderLayout.EAST);
    So could someone please help me and correct my code so that each text lable is lined up next to its jtf java text field.

  • Client / Server Socket Communication - Should use 2 ports?

    If we have a client server architecture using a socket based connection, should there be 2 serperate sockets? One dedicated to sending and one dedictated to receiving? What happens if both the client and server both send at the same time? How does that get handled? Does one of the messages get dropped? Thanks...

    There are of course reasons you might want to use two sockets.
    For instance security. One socket is encrypted and the other isn't. Or because the server initiates a confirmed port connection back it verifies the IP.
    Or because the main socket is used for control and the second one is used for data. That way the client can tell the server to pause or make other adjustments in the data while the data is still flowing.

  • How to set proxy for client-server socket connection?

    I'm using the code found on the following page to create a client (mobile) to server (pc) connection and send a text message.
    This works with mobile operators without proxy, but does nothing when the operator uses a proxy. The question is, exactly how to set the proxy and port values for using that code.
    Any help is greatly appreciated, thanks,

    It's part of the cellular settings, and is usually set up by your 3G provider. You can't choose your own proxy server

  • Large file transfer problems over client/server socket

    I wrote a simple chat problem in which I can send files from client to client. The problem is when I send large files over 101 MB the transfer freezes. I do not even get any error mesages in the console. The files I am sending are of any type (Ex mp3, movies, etc...). I am serializing the data into a "byteArray[packetSize]" and sending the file packet by packet until the whole file has been sent, and reconstructed on the other side. The process works perfectly for files smaller than 101MB, but for some reason freezes after that if the file is larger. I have read many forums and there aren't too many solutions out there. I made sure to use the .reset() method to reset my ObjectOutputStream each time I write to it.
    Here's my file sending code:
    byte[] byteArray = new byte[defaultPacketSize];
    numPacketsRequired = Math.ceil(fileSize / defaultPacketSize);
    try {
    int i = 0;
    reader = new FileInputStream(filePath);
    while (reader.available() > 0) {
    if (reader.available() < defaultPacketSize) {
    byte[] lastPacket = new byte[reader.available()];;
    try {
    if (socket == null || output == null) {
    throw new SocketException("socket does not exist");
    catch (Exception e) {
    System.out.println("Exception ***: " + e);
    else {;
    try {
    if (socket == null || output == null) {
    throw new SocketException("socket does not exist");
    catch (Exception e) {
    System.out.println("Exception ***: " + e);
    catch (Exception e) {
    System.out.println("COULD NOT READ PACKET");
    Here's my file receiving code:
    try {
    // The message from the client
    Object streamInput;
    FileOutputStream writer;
    byte[] packet;
    while (true) {
    streamInput = input.readObject();
    if (streamInput instanceof byte[]) {
    packet = (byte[]) streamInput;
    try {
    writer = new FileOutputStream(outputPath, true);
    writer.write(packet); //Storing the bytes on file
    catch (Exception e) {
    System.out.println("Exception: " + e);
    else if (streamInput.equals("DONE")) {
    catch (Exception e) {
    I'm looking for any way I can possibly send large files from client to client without having it freeze. Are there any better file transfer ways other than socket? I don't really want FTP. I think I want to keep it HTTP.
    Any suggestions would be helpful.Thanks!

    I've taken a better look a the code you posted, and
    there is one problem with the receiving code. You
    keep repeatedly opening and closing the
    FileOutputStream. This is not going to be efficient
    as the file will keep needing to be positioned to its
    end.Yes sorry I did change that code so that it leaves the file open until completely done writing. Basically I have a progress bar that records how far along in the writing process the client is, and when the progress bar reaches 100%, meaning the file is complete, the file.close() method is invoked. Sorry about that.
    I also ran some memory tests using the "Runtime.getRuntime().totalMemory()", and "Runtime.getRuntime().freeMemory()" methods. I put these methods inside the loop where I read in the file and send it to the client. here's the output:
    Sender's free memory: 704672
    File reader read 51200 bytes of data.
    767548 left to read.
    Sender's runtime memory: 2818048
    Sender's free memory: 702968
    File reader read 51200 bytes of data.
    716348 left to read.
    Sender's runtime memory: 2818048
    Sender's free memory: 701264
    File reader read 51200 bytes of data.
    665148 left to read.
    Sender's runtime memory: 2818048
    Sender's free memory: 699560
    File reader read 51200 bytes of data.
    613948 left to read.
    Sender's runtime memory: 2818048
    Sender's free memory: 697856
    File reader read 51200 bytes of data.
    562748 left to read.
    Sender's runtime memory: 2818048
    Sender's free memory: 696152
    File reader read 51200 bytes of data.
    511548 left to read.
    Sender's runtime memory: 2818048
    Sender's free memory: 694448
    File reader read 51200 bytes of data.
    460348 left to read.
    Sender's runtime memory: 2818048
    Sender's free memory: 692744
    File reader read 51200 bytes of data.
    409148 left to read.
    Sender's runtime memory: 2818048
    Sender's free memory: 691040
    File reader read 51200 bytes of data.
    357948 left to read.
    Sender's runtime memory: 2818048
    Sender's free memory: 689336
    File reader read 51200 bytes of data.
    306748 left to read.
    Sender's runtime memory: 2818048
    Sender's free memory: 687632
    File reader read 51200 bytes of data.
    255548 left to read.
    Sender's runtime memory: 2818048
    Sender's free memory: 685928
    File reader read 51200 bytes of data.
    204348 left to read.
    Sender's runtime memory: 2818048
    Sender's free memory: 684224
    File reader read 51200 bytes of data.
    153148 left to read.
    Sender's runtime memory: 2818048
    Sender's free memory: 682520
    File reader read 51200 bytes of data.
    101948 left to read.
    Sender's runtime memory: 2818048
    Sender's free memory: 680816
    File reader read 51200 bytes of data.
    50748 left to read.
    Sender's runtime memory: 2818048
    Sender's free memory: 679112
    File reader read 50748 bytes of data.
    0 left to read.
    Creating last packet of size: 50748
    Last packet size after setting it equal to byteArray: 50748
    Here's the memory stats from the receiver:
    Receiver's free memory: 639856
    Receiver's total memory: 2842624
    Receiver's free memory: 638920
    Receiver's total memory: 2842624
    Receiver's free memory: 637984
    Receiver's total memory: 2842624
    Receiver's free memory: 637048
    Receiver's total memory: 2842624
    Receiver's free memory: 636112
    Receiver's total memory: 2842624
    Receiver's free memory: 635176
    Receiver's total memory: 2842624
    Receiver's free memory: 634240
    Receiver's total memory: 2842624
    Receiver's free memory: 633304
    Receiver's total memory: 2842624
    Receiver's free memory: 632368
    Receiver's total memory: 2842624
    Receiver's free memory: 631432
    Receiver's total memory: 2842624
    Receiver's free memory: 630496
    Receiver's total memory: 2842624
    Receiver's free memory: 629560
    Receiver's total memory: 2842624
    Receiver's free memory: 628624
    Receiver's total memory: 2842624
    Receiver's free memory: 627688
    Receiver's total memory: 2842624
    Receiver's free memory: 626752
    Receiver's total memory: 2842624
    Receiver's free memory: 625816
    Receiver's total memory: 2842624
    Receiver's free memory: 624880
    Receiver's total memory: 2842624
    Receiver's free memory: 623944
    Receiver's total memory: 2842624
    Receiver's free memory: 623008
    Receiver's total memory: 2842624
    Receiver's free memory: 622072
    Receiver's total memory: 2842624
    Receiver's free memory: 621136
    Receiver's total memory: 2842624
    Receiver's free memory: 620200
    Receiver's total memory: 2842624
    Receiver's free memory: 619264
    Receiver's total memory: 2842624
    Receiver's free memory: 618328
    Receiver's total memory: 2842624
    Receiver's free memory: 617392
    Receiver's total memory: 2842624
    Receiver's free memory: 616456
    Receiver's total memory: 2842624
    Receiver's free memory: 615520
    Receiver's total memory: 2842624
    Receiver's free memory: 614584
    this is just a sample of both receiver and sender's stats. Everything appears to be fine! Hope this message post isn't too long.

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