Client Server Socket With GUI
Hi,
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.*;
import java.io.*;
import java.net.*;
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");
button.addActionListener(this);
panel = new JPanel();
panel.setLayout(new BorderLayout());
panel.setBackground(Color.white);
getContentPane().add(panel);
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();
out.println(text);
textField.setText(new String(""));
//Receive text from server
try{
String line = in.readLine();
System.out.println("Text received :" + line);
} catch (IOException e){
System.out.println("Read failed");
System.exit(1);
public void listenSocket(){
//Create socket connection
try{
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");
System.exit(1);
} catch (IOException e) {
System.out.println("No I/O");
System.exit(1);
public static void main(String[] args){
SocketClient frame = new SocketClient();
frame.setTitle("Client Program");
WindowListener l = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
frame.addWindowListener(l);
frame.pack();
frame.setVisible(true);
frame.listenSocket();
SERVER Code
import java.awt.Color;
import java.awt.BorderLayout;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.net.*;
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");
button.addActionListener(this);
panel = new JPanel();
panel.setLayout(new BorderLayout());
panel.setBackground(Color.white);
getContentPane().add(panel);
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){
textArea.setText(line);
public void listenSocket(){
try{
server = new ServerSocket(4444);
} catch (IOException e) {
System.out.println("Could not listen on port 4444");
System.exit(-1);
try{
client = server.accept();
} catch (IOException e) {
System.out.println("Accept failed: 4444");
System.exit(-1);
try{
in = new BufferedReader(new InputStreamReader(client.getInputStream()));
out = new PrintWriter(client.getOutputStream(), true);
} catch (IOException e) {
System.out.println("Accept failed: 4444");
System.exit(-1);
while(true){
try{
line = in.readLine();
//Send data back to client
out.println(line);
} catch (IOException e) {
System.out.println("Read failed");
System.exit(-1);
protected void finalize(){
//Clean up
try{
in.close();
out.close();
server.close();
} catch (IOException e) {
System.out.println("Could not close.");
System.exit(-1);
public static void main(String[] args){
SocketServer frame = new SocketServer();
frame.setTitle("Server Program");
WindowListener l = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
frame.addWindowListener(l);
frame.pack();
frame.setVisible(true);
frame.listenSocket();
Again help on this is very welcomed
Similar Messages
-
Client/Server Program with GUI
Hello all...I've been working on an instant messenger type of program, and need a way to keep track of different clients using my server, and then posting that list to my clients' GUI, to show them who is "Online" Also, I am having trouble, letting my server know which client to send a message to...i.e. client1 tries to say "Hello" to client2 but nothing happens... Anyways I gonna keep pluggin away at it but if you have any insight let me know please...Damn I just got this new error a second ago, for no apperent reason...
ReceivingThread.java [156:1] cannot resolve symbol
symbol : constructor SendingThread (int)
location: class SendingThread
SendingThread sendingThread = new SendingThread(8205);
^
1 error
...and here's the code for it, just popped up outta nowhere...thx again!!
import java.io.*;
import java.net.*;
import java.util.StringTokenizer;
public class ReceivingThread extends Thread {
private byte[] message;
private int portNumber;
private InetAddress address;
private BufferedReader input;
private boolean keepListening = true;
// ReceivingThread constructor
public ReceivingThread( Socket clientSocket )
// invoke superclass constructor to name Thread
super( "ReceivingThread: " + clientSocket );
// set timeout for reading from clientSocket and create
// BufferedReader for reading incoming messages
try {
clientSocket.setSoTimeout( 5000 );
input = new BufferedReader( new InputStreamReader(
clientSocket.getInputStream() ) );
// handle exception creating BufferedReader
catch ( IOException ioException ) {
ioException.printStackTrace();
} // end ReceivingThread constructor
// listen for new messages and deliver them to MessageListener
public void run()
String message;
// listen for messages until stoppped
while ( keepListening ) {
// read message from BufferedReader
try {
message = input.readLine();
// handle exception if read times out
catch ( InterruptedIOException interruptedIOException ) {
// continue to next iteration to keep listening
continue;
// handle exception reading message
catch ( IOException ioException ) {
ioException.printStackTrace();
break;
// ensure non-null message
if ( message != null ) {
// tokenize message to retrieve user name
// and message body
StringTokenizer tokenizer = new StringTokenizer( message, "|" );
// ignore messages that do not contain a user
// name and message body
if ( tokenizer.countTokens() == 2 ) {
// send message to the client through SendingThread; fill in proper info
SendingThread sendingThread = new SendingThread(8205);
sendingThread.start();
else
// if disconnect message received, stop listening
if ( message.equalsIgnoreCase("DISCONNECT") ) {
keepListening = false;
} // end if
} // end while
// close BufferedReader (also closes Socket)
try {
input.close();
// handle exception closing BufferedReader
catch ( IOException ioException ) {
ioException.printStackTrace();
} // end method run
}1) The error is down to the fact that you don't have a constructor declared for class SendingThread that accepts an int.
2) To show who's on line use a static ArrayList at the server side. Everytime a user connects, just do:
String user = "bob";
arrayList.add(user);
ArrayList is serialisable so you can serialise the object and send it over the network to the client. The client can deserialise the object and it will in effect have a copy of the object.
When the client wants to display the names you just need to iterate over the array list.
As new users connect you will have to update the list and also inform all other connected users that a new user has connected. You could do this by either pushing the data (client waits for data and server sends it immediately) or pulling the data at regular time intervals. I would suggest the first method as you will (or should) already have a thread set up to listen for incoming data.
3) For sending messages between two hosts, you might want to set up a direct connection, however you would probably be better off sending message via the server. This makes setting up group chats much easier. Each message could be prefixed with the ID of the intended recipient. For group chat it will will be prefixed with group ID. The server should keep a record of group ID's to find out who's in each group. -
We sometimes see this failure intermitently when using the FlexUnit Ant task to run tests in a CI environment. The Ant task throws this exception:
java.util.concurrent.ExecutionException: could not close client/server socket
I have seen this for a while now, and still see it with the latest 4.1 RC versions.
Here is the console output seen along with the above exception:
FlexUnit player target: flash
Validating task attributes ...
Generating default values ...
Using default working dir [C:\DJTE\commons.formatter_swc\d3flxcmn32\extracted\Source\Flex]
Using the following settings for the test run:
FLEX_HOME: [C:\dev\vert-d3flxcmn32\302100.41.0.20110323122739_d3flxcmn32]
haltonfailure: [false]
headless: [false]
display: [99]
localTrusted: [true]
player: [flash]
port: [1024]
swf: [C:\DJTE\commons.formatter_swc\d3flxcmn32\extracted\build\commons.formatter.tests.unit.sw f]
timeout: [1800000ms]
toDir: [C:\DJTE\commons.formatter_swc\d3flxcmn32\reports\xml]
Setting up server process ...
Entry [C:\DJTE\commons.formatter_swc\d3flxcmn32\extracted\build] already available in local trust file at [C:\Users\user\AppData\Roaming\Macromedia\Flash Player\#Security\FlashPlayerTrust\flexUnit.cfg].
Executing 'rundll32' with arguments:
'url.dll,FileProtocolHandler'
'C:\DJTE\commons.formatter_swc\d3flxcmn32\extracted\build\commons.formatter.tests.unit.swf '
The ' characters around the executable and arguments are
not part of the command.
Starting server ...
Opening server socket on port [1024].
Waiting for client connection ...
Client connected.
Setting inbound buffer size to [262144] bytes.
Receiving data ...
Sending acknowledgement to player to start sending test data ...
Stopping server ...
End of test data reached, sending acknowledgement to player ...
When the problem occurs, it is not always during the running of any particular test (that I am aware of). Recent runs where this failure was seen had the following number of tests executed (note: the total number that should be run is 45677): 18021, 18, 229.
Here is a "good" run when the problem does not occur:
Setting inbound buffer size to [262144] bytes.
Receiving data ...
Sending acknowledgement to player to start sending test data ...
Stopping server ...
End of test data reached, sending acknowledgement to player ...
Closing client connection ...
Closing server on port [1024] ...
Analyzing reports ...
Suite: com.formatters.help.TestGeographicSiteUrls
Tests run: 5, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.008 sec
Suite: com.formatters.functionalUnitTest.testCases.TestNumericUDF
Tests run: 13, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.071 sec
Results :
Tests run: 45,677, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 201.186 sec
Has anyone else ran across this problem?
Thanks,
TrevorI am not sure if this information will help everyone, but here goes...
For us, these problems with FlexUnit tests crashing the Flash Player appear to be related to couple of factors. Recently, we moved up from Flex 3.2 to Flex 4.1 as our development baseline. Many people complained that their development environment (Flash Builder, etc.) was much more unstable. Apparently, 4.1 produces SWFs that require more memory to run than 3.2 does? Anyway, we still had Flash Player 10.1 as our runtime baseline. Apparently, that version of the player was not as capable of running larger FlexUnit test SWFs, and would crash (as I posted months earlier). I upgraded to the latest 10.3 standalone player versions, and the crashes have now ceased. It would be nice to know exactly what was causing the crashes, but memory management (or lack of) is my best guess.
So, if you are seeing these issues, try upgrading to the latest Flash Player version.
Regards,
Trevor -
Client/server socket based application
hi does anyone have example of client/server socket based application using Spring and Maven
where application do the following
Client sends a request with a path to any file on the server
„h Server reads the file and responds back with the content
„h Client outputs the content to the console
am trying to follow this
http://www2.sys-con.com/itsg/virtualcd/java/archives/0205/dibella/index.html
http://syntx.io/a-client-server-application-using-socket-programming-in-java/
am using java 6i have attempt code but i wht to do the following
client/server socket based application that will read the content of a file and stream the content of the file to the client. The client must simply output the content of the file to the console using System.out. The client must be able to run in a standalone mode (non-network mode) or in a remote mode.
Additionally the client must be designed in a way that i can print the output to a console but must be interchangeable where if requirements change i can persist the response to file or persist the response to a database.
/* Server.java*/
///ifgetBoolen= true then...
import java.io.*;
import java.net.*;
import java.util.*;
import java.sql.*;
public class Server
static String array[][];
// STEP 1 a1
// Server socket
ServerSocket listener;
// STEP 1 a2 Client connection
Socket client;
ObjectInputStream in;
ObjectOutputStream out;
public void createConnection() throws IOException
System.out.println("\nSERVER >>> Waiting for connection.....");
client = listener.accept();
String IPAddress = "" + client.getInetAddress();
DisplayMessage("SERVER >>> Connected to " + IPAddress.substring(1,IPAddress.length()));
public void runServer()
// Start listening for client connections
// STEP 2
try
listener = new ServerSocket(12345, 10);
createConnection();
// STEP 3
// processConnection();
catch(IOException ioe)
DisplayMessage("SERVER >>> Error trying to listen: " + ioe.getMessage());
private void closeConnection()
DisplayMessage("SERVER >>> Terminating connections");
try
if(out != null && in != null)
out.close();
in.close();
client.close();
catch(IOException ioe)
DisplayMessage("SERVER >>> Closing connections");
public static void define2DArray(ResultSet RS, int Size)
try
ResultSetMetaData RMSD = RS.getMetaData();
DisplayMessage("SERVER >>> Requested arraySize: " + Size);
if (RS.next())
array = new String[Size][RMSD.getColumnCount()];
for (int Row = 0; Row < Size; Row++)
for (int Col = 0; Col < RMSD.getColumnCount(); Col++)
array[Row][Col] = new String();
array[Row][Col] = RS.getString(Col+1);
DisplayMessage(array[Row][Col] + " ");
RS.next();
else
array = new String[1][1];
array[0][0] = "#No Records";
catch (Exception e)
DisplayMessage("SERVER >>> Error in defining a 2DArray: " + e.getMessage());
public static void DisplayMessage(final String IncomingSMS)
System.out.println(IncomingSMS);
//client
* @author
import java.io.*;
import java.net.*;
import javax.swing.*;
public class ClientSystem
static Socket server;
static ObjectOutputStream out;
static ObjectInputStream in;
static String Response[][];
static boolean IsConnected = false;
static int Num = 0;
public static void connectToServer() throws IOException
server = new Socket("127.0.0.1", 12345);
// server = new Socket("000.00.98.00", 12345);
String IPAddress = "" + server.getInetAddress();
DisplayMessage("\nCLIENT >>> Connected to " + IPAddress.substring(1,IPAddress.length()));
public static void getStreams() throws IOException
out = new ObjectOutputStream(server.getOutputStream());
out.flush();
in = new ObjectInputStream(server.getInputStream());
IsConnected = true;
DisplayMessage("CLIENT >>> Got I/O streams");
public static void runClient()
try
connectToServer();
getStreams();
DisplayMessage("CLIENT >>> Connection successfull....\n");
DisplayMessage("CLIENT >>> Want to talk to server");
catch (IOException ioe)
System.out.print("."+Num);
Num++;
public static void closeConnection()
try
out.close();
in.close();
server.close();
catch(IOException error)
DisplayMessage("CLIENT >>> Could not close connections");
public static void Start()
System.out.print("\nCLIENT >>> Attempting connection.....");
try
IsConnected = false;
while (IsConnected == false)
runClient();
if (IsConnected == false)
Thread.sleep(100);
catch (Exception e)
DisplayMessage("CLIENT >>> Attempting connection.....");
public static String sendSMS(String sms)
Response = new String[0][0];
try
DisplayMessage("CLIENT >>> " + sms);
out.writeObject(sms);
out.flush();
Response = (String[][])in.readObject();
DisplayMessage("CLIENT >>> Waiting for server to respond...");
for (int Row = 0; Row < Response.length; Row++)
System.out.printf( "_SERVER >>> \t");
for (int Col = 0; Col < Response[Row].length; Col++)
//DisplayMessage( "_SERVER >>> " + Response[Row][Col] + " ");
System.out.printf( "%s\t", Response[Row][Col]);
System.out.println();
DisplayMessage("CLIENT >>> Query processed successfully....\n");
catch(ClassNotFoundException cnfe)
DisplayMessage("CLIENT >>> Class not found for casting received object");
catch(IOException ioe)
reConnect();
catch (Exception sqle)
DisplayMessage("CLIENT >>> Error sending query ??? " + sqle.getMessage());
return "transmission successfull";
public static void reConnect()
try
DisplayMessage("CLIENT >>> Connection was lost. Trying to reconnect...");
closeConnection();
Thread.sleep(100);
IsConnected = false;
while (IsConnected == false)
runClient();
Thread.sleep(200);
catch (Exception e)
DisplayMessage("CLIENT >>> Error trying to Re-Connect...");
public static void DisplayMessage(final String IncomingSms)
System.out.println(IncomingSms);
System.out.printf("Isms: %s", IncomingSms); ///naah.
public static String[][] getResponse()
return Response;
public static String getResponse(int row, int col)
return Response[row][col];
how can i do below using above code
The program must be able to work in a non-networked mode. In this mode, the server and client must run in the same VM and must perform no networking, must not use loopback networking i.e: no “localhost” or “127.0.0.1”, and must not involve the serialization of any objects when communicating between the client and server components.
The operating mode is selected using the single command line argument that is permitted.
imust use a socket connection and define a protocol. networking must be entirely bypassed in the non-network mode. -
Client/Server API with push?
I set up a simple Socket client server architecture with the Java socket API. However, my clients sometimes are initiators or requests, and sometimes my server is the initiator of infos. Example: client want to get infos from server but also want to tell the server something. The server tells all registered clients something but also can accept requests from clients. So both sides are client AND server (depending on what they currently want to do).
The socket API is just a classic client/server API, i.e. a server listens and a client sends requets and get responses. For my server to send requests to all clients, this is not enough. Is the only way to have all clients offering a socket server on their computer, too? so that this 2-way-request-communication works?
This is basically some kind of "push" technology, but i don't want my clients to "poll" the server just to emulate the feature of sending requests from the server to the client. Is there some other (perhaps non-socket) API that offers this?@sjasja: how is the socket api symmetrical?It is, trust me! Connection initiation isn't, but after that it is. (Let's assume connected TCP/IP.)
The server does bind() and accept(), the client does connect(). After that, the connection is symmetrical: either end can issue any number of read() and write() calls in any order. You write() to a socket, it pops out from read() at the other end (though not necessarily as a single packet; TCP/IP is stream oriented, so write() "packets" can and will be glued together, or fragmented at the whimsy of network routers and friends.)
- accept() //wait for client to send request
- socket.getInputStream() //read request
- socket .getOutputStream() //write responseThose don't read or write; they get streams which you can read from and write to.
In the server, when accept() returns a new connection, you'd start a reader thread for that client. The thread would read() (or readLine() if you implement a line-oriented protocol) and handle the incoming messages. Whenever you want to write to the client, write to the stream returned by socket.getOutputStream(). You may need to synchronize writes if you have several threads that do sequences of write()s that need to arrive at the client sequentially.
As to the difficulty of socket programming: I don't think it particularly difficult. But then I've written dozens of socket programs since my first one in '85... The Java Tutorial socket chapter shows a simple client/server pair; not terribly difficult I think. In particular, check out the KKMultiServer at the bottom of the sample server chapter. -
Client Server Application with images or icons
I made a Client Server application with JFrames, but I put a jLabel with an icon, and I can't run the Client.
It says java.lang.NullPointerException
Do you know why I can't see the icon in the JLabel? It isn't an applet, it's an application with JFrames.You have to explain the problem better if you want some help. Also show the code which is giving you the nullpointerexception(Do not forget codetags!).
-
White Paper: End-to-End Client/Server Security with the Adobe Flash Platform
Today we released a sorely needed white paper on end-to-end client/server security with the Adobe Flash Platform. This information is directly applicable to the Adobe LiveCycle family as well as Flash RIAs.
http://www.slinnbooks.com/books/enterprise/securityWhitePaper.shtml
Thank you,
Mike
Michael Slinn
http://micronauticsresearch.com
http://slinnbooks.comHai,
Delete the certificate in the ABAP system and try importing the new certificate from the EP instance(ADS) and export into the ABAP and check...
Thanks and Regards, -
Client-Server programming with Sockets
How to read user input from GUI in client socket and send the data to server socket? Can someone give example of the coding?
Thank you.Take a look at reply 28 of Program hanging on a Thread. That post is a swing based socket client. If you are using Swing you must ensure that all swing activity occurs on the AWT Event Dispatch Thread. That's the reason for the use of invokeLater.
Reply 21 on the same thread is a multithreaded command line server. -
Best practice for client-server(Socket) application
I want to build a client-server application
1) On startup.. client creates connection to Server and keeps reading data from server
2) Server keeps on sending different messages
3) Based on messages(Async) from server client view has to be changed
I tried different cases ended up facing IllegalStateChangeException while updating GUI
So what is the best way to do this?
Please give a working example .
Thanks,
Vijay
Edited by: 844427 on Jan 12, 2012 12:15 AM
Edited by: 844427 on Jan 12, 2012 12:16 AMHi EJP,
Thanks for the suggestion ,
Here is sample code :
public class Lobby implements LobbyModelsChangeListener{
Stage stage;
ListView<String> listView;
ObservableList ol;
public Lobby(Stage primaryStage) {
stage = primaryStage;
ProxyServer.startReadFromServer();//Connects to Socket Server
ProxyServer.addLobbyModelChangeListener(this);//So that any data from server is fetched to Lobby
init();
private void init() {
ProxyServer.getLobbyList();//Send
ol = FXCollections.observableArrayList(
"Loading Data..."
ol.addListener(new ListChangeListener(){
@Override
public void onChanged(Change change) {
listView.setItems(ol);
Group root = new Group();
stage.setScene(new Scene(root));
listView = new ListView<String>();
listView.maxWidth(stage.getWidth());
listView.setItems(ol);
listView.getSelectionModel().setSelectionMode(SelectionMode.SINGLE);
istView.setOnMouseClicked(new EventHandler<MouseEvent>(){
@Override
public void handle(MouseEvent t) {
// ListView lv = (ListView) t.getSource();
new NewPage(stage);
root.getChildren().add(listView);
@Override
public void updateLobby(LobbyListModel[] changes) {
// listView.getItems().clear();
String[] ar = new String[changes.length];
for(int i=0;i<changes.length;i++)
if(changes!=null)
System.out.println(changes[i].getName());
ar[i] = changes[i].getName();
ol.addAll(ar);
ProxyServer.javaProxyServer
//Implements runnable
public void run()
......//code to read data from server
//make array of LobbyListModel[] ltm based on data from server
fireLobbyModelChangeEvent(ltm);
void addLobbyModelChangeListener(LobbyModelsChangeListener aThis) {
this.lobbyModelsChangeListener = aThis;
private void fireLobbyModelChangeEvent(LobbyListModel[] changes) {
LobbyModelsChangeListener listner
= (LobbyModelsChangeListener) lobbyModelsChangeListener;
listner.updateLobby(changes);
Exception :
java.lang.IllegalStateException: Not on FX application thread; currentThread = Thread-5
at line ol.addAll(ar);
But ListView is getting updated with new data...so not sure if its right way to proceed...
Thanks,
Vijay -
Publishing .fla project including client - server socket connection
Hi,
I have designed with Adobe Flash Professional CS5 a .fla project that integrates a client - server connection.
After publishing it, I have the following issue:
- when running the generated .exe file for Windows, then the connection to the server works perfectly
- but when I am running the published .html file, then nothing is sent to the server.
I have tried to change the Publish Settings.
When setting the Local Playback Security in Flash menu to "Access network only" instead of "Access local files only" then the last packet that was send using the .exe file is resent once and that's all (the html client does not receive the response from the server and the next connection attemps generate data transfer).
I guess I have to change some security settings somewhere but I didn't find which.
Does anybody have a hint ?
Thanks.Hi again,
I was finally able to solve the issue.
I did not get any error message when using firefox, but using iExplorer provided me this error:
"Local-with-filesystem SWF files are not permitted to use sockets"
Googling did then allow me to find the solution here:
http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager04.htm l
The local locations on which I store my html page during the development has to be added to the trusted locations in the global security settings.
Hope it will help some other people.
Best regards -
Client == server - problems with callbacks
Hi everyone!
I'm having trouble establishing bidirectional communication between a client and a server (code samples are below).
Both classes (client & server) extend UnicastRemoteObject and implement Interfaces that are extending Remote. Now the client looks up the server and tries to register itself at the server by calling a method like this:
remote_server.setClient(this);
as long as I execute both programs in the same LAN this method-call works fine, but when client and server connect through internet I'm getting the following exception:
---------------------- Exception ------------------------>
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.ConnectException: Connection refused to host: 192.168.0.3; nested exception is:
java.net.ConnectException: Connection timed out
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:292)
<---------------------- Exception ------------------------
maybe helpful:
- 192.168.0.3 is the client's LAN-IP
- I am directly connected to the internet via ADSL-modem (no router)
I searched the forums for several hours now, I read through the following tutorial,
http://developer.java.sun.com/developer/onlineTraining/rmi/exercises/RMICallback/index.html
but still I didn't find a solution.
I already spent a lot of time developing this and I start to get desperate, so I hope someone of you out there can help me!
pilord
==================== Codesamples =======================>
public class ServerImpl extends UnicastRemoteObject implements Server {
Client client;
public ServerImpl() {
LocateRegistry.getRegistry(1096).rebind("test",this);
/* specified in Remote-Interface: Server*/
public void setClient(Client client) {
this.client = client;
public class ClientImpl extends UnicastRemoteObject implements Client {
public ClientImpl() {
Server s = Naming.lookup("rmi://***.***.***.***:1096/test");
s.setClient(this); // HERE is the trouble.
<==================== Codesamples =======================Don't feel lost, crumb. Http tunnelling is not as complex as it seems. I just started using RMI at my new job here and in a couple of weeks I've already picked up on alot of what I needed to know. (I just posted a question myself on the same topic.) Basically what you have to do is set up a web server for RMI to talk to at the server side. It will work if the webserver is listening on port 80 with the rmiservlet.ServletHandler registered to respond to any path request of cgi-bin/java-rmi.cgi. In other words "cgi-bin/java-rmi.cgi" should be the servlet-mapping of the ServletHandler. The servlet merly acts as a proxy on behalf of the RMI client and fowards the request to the desired port on the server. If you know how to set up a servlet as the default web app then it is really a breeze. On the client side you only need to set the http.proxyHost and http.proxyPort system properties to the appropriate values for your proxy server. (I mistyped these property names in my prior post use what I have here as I just read it out of the RMI book.) Do a search on HTTP tunnelling and you should turn up dozens of hits. I have the source to the servlet if you need it. I've already modified it for my own purposes though it should still work for you. If you forego http tunnelling then you'll have to do a complete app rewrite to use another protocol because RMI just doesn't work through firewalls without it. Alternatively you can get down and dirty with some low level sockets coding (this is what I'm thinking I'll end up doing eventually) to get it working without standard RMI/HTTP but that's way more complex. Unfortunately it looks like your callback code will need to be rewritten unless you either go commercial or do the socket stuff. (There does seem to be a shareware product called rmi doves that would help you here.) I'll be happy to assits you in any way as you need help.
Cliff -
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.io.*;
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.*;
// View customer panel
class ViewCustomer extends JPanel implements ActionListener
// Buttons for viewing customer information
private JButton jbtFirst, jbtNext, jbtPrevious, jbtLast;
// Random access file
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.java: 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));
// Panel p1 for holding all the labels
JPanel p1 = new JPanel();
p1.setLayout(new GridLayout(3, 1));
p1.add(new JLabel("Registration number"));
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));
p4.add(jtfModel);
p4.add(jtfEnginesize);
p4.add(jtfCharge);
p4.add(jtfMileage);
p4.add(p3);
// Place p1 and p4 into customerPanel
setLayout(new BorderLayout());
add(p1, BorderLayout.WEST);
add(p4, BorderLayout.CENTER);
// Get customer information from the text fields
public Customer getCustomer()
return new Customer(jtfRegistrationnumber.getText().trim(),
jtfSeatingcapacity.getText().trim(),
jtfStartdateofhire.getText().trim(),
jtfDurationofhire.getText().trim(),
jtfManufacture.getText().trim(),
jtfModel.getText().trim(),
jtfEnginesize.getText().trim(),
jtfCharge.getText().trim(),
jtfMileage.getText().trim());
// Set customer information on the text fields
public void setCustomer(Customer s)
jtfRegistrationnumber.setText(s.getRegistrationnumber());
jtfSeatingcapacity.setText(s.getSeatingcapacity());
jtfStartdateofhire.setText(s.getStartdateofhire());
jtfDurationofhire.setText(s.getDurationofhire());
jtfManufacture.setText(s.getManufacture());
jtfModel.setText(s.getModel());
jtfEnginesize.setText(s.getEnginesize());
jtfCharge.setText(s.getCharge());
jtfMileage.setText(s.getMileage());
Could someone please help me and tell me what these two errors mean and how I could get rid of themCan 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()
// Set the panel with line border
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));
p2.add(jtfRegistrationnumber);
p2.add(jtfSeatingcapacity);
p2.add(jtfEnginesize);
p2.add(jtfStartdateofhire);
p2.add(jtfDurationofhire);
//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));
p5.add(jtfManufacture);
p5.add(jtfModel);
p5.add(jtfMileage);
p5.add(jtfCharge);
// 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?
Hi,
I'm using the code found on the following page to create a client (mobile) to server (pc) connection and send a text message.
http://javafaq.nu/java-example-code-503.html
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
Hi,
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()];
reader.read(lastPacket);
try {
if (socket == null || output == null) {
throw new SocketException("socket does not exist");
output.writeObject(lastPacket);
output.reset();
output.writeObject("DONE");
output.reset();
output.close();
socket.close();
catch (Exception e) {
System.out.println("Exception ***: " + e);
output.close();
socket.close();
else {
reader.read(byteArray);
try {
if (socket == null || output == null) {
throw new SocketException("socket does not exist");
output.writeObject(byteArray);
output.reset();
catch (Exception e) {
System.out.println("Exception ***: " + e);
output.close();
socket.close();
reader.close();
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
writer.close();
catch (Exception e) {
System.out.println("Exception: " + e);
else if (streamInput.equals("DONE")) {
socket.close();
input.close();
break;
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!
EvanI'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.
Thanks!
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