Simple TCP Chat program behid router
Hello, I've been reading some of the examples from http://pirate.shu.edu/~wachsmut/Teaching/CSAS2214/Virtual/Lectures/chat-client-server.html, and understand how these examples work well enough to fool around with it...
I have it working inside my local network (behind a router), but when I try to have someone from outside my network connect to my server, they are unable to connect. I used IPchicken to determine which IP to give them.
What do I need to do to get this working behind routers?
Thanks for any time taken.
DeshBanks wrote:
I figured it out, it looks like.
I had to login to my router and configure virtual routing (or something like that - I think it is basically port forwarding) on a specific port to my machine on the private network. I then had to 'allow' this port in my firewall.Hence my advice in reply 1 to google for port forwarding and check out your router's manual.
Similar Messages
-
Simple TCP chat application half duplex not working for me
I m having a problem in TCP application working half duplex
My friend runs client program who is in near by city and i run the server program in my system
Let my ip address is 116.x.y.z
My server program is
import java.net.*;
import java.io.*;
public class tcpserver
public static void main(String args[]) throws IOException
ServerSocket s1=null;
try
s1=new ServerSocket(98);
catch(IOException e)
System.err.println("Could not find port 98");
System.exit(1);
Socket c=null;
try
c=s1.accept();
System.out.println("Connection from"+c);
catch(IOException e)
System.out.println("Accept failed");
System.exit(1);
PrintWriter out=new PrintWriter(c.getOutputStream(),true);
BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
System.out.println("I am ready,type now");
String l=in.readLine();
while(l!=null)
out.println(l);
out.close();
in.close();
c.close();
s1.close();
}The Client program is which my friend executes is
import java.net.*;
import java.io.*;
public class tcpclient
public static void main(String arg[]) throws IOException
Socket s=null;
BufferedReader b=null;
try
s=new Socket(InetAddress.getByName("116.x.y.z"),98);
b=new BufferedReader(new InputStreamReader(s.getInputStream()));
catch(UnknownHostException u)
System.err.println("I dont know host");
System.exit(0);
String inp;
while((inp=b.readLine())!=null)
System.out.println(inp);
break;
b.close();
s.close();
}Important Note: When i run this program specifying within my system its working ( i mean running the program in two different windows(terminals) its working for me)
When i give the client program to my friend its getting compiling for him but not running for him
Its showing him unknownhost exception and main method not found like this.
Please correct the above code or else just what kind of strategy we should follow in order to get rid of this problem
When i normally run this program in my system
the output when i run in my own system is
Output for running tcpserver.java
~\JDK2~1.0\bin>java tcpserver
Connection fromSocket[addr=/116.x.y.z,port=1930,localport=98] // in output i edit the ip address text
I am ready,type now
this is test text
Output for running tcpclient.java
~\JDK2~1.0\bin>java tcpclient
this is test text
My problem is its working in my system when it exceeds out the output is not available for me
Help me Please !!!String l=in.readLine();
while(l!=null)
out.println(l);
}That will print the same thing forever. Make it the same as the loop in the client.
Important Note: When i run this program specifying within my system its working ( i mean running the program in two different windows(terminals) its working for me)Looping forever might be what you call 'working'. I don't.
Its showing him unknownhost exception and main method not found like this.Change this:
new Socket(InetAddress.getByName("116.x.y.z"),98)to this:
new Socket("116.x.y.z",98)although your friend may then run into connectivity problems ... -
Simple TCP Client Program Problems
The Code:
import java.io.*;
import java.net.*;
class TCPClient {
public static void main(String argv[]) throws Exception
String sentence;
String modifiedSentence;
BufferedReader inFromUser = new BufferedReader(
new InputStreamReader(System.in));
Socket clientSocket = new Socket("www.utm.edu", 80);
DataOutputStream outToServer = new DataOutputStream(
clientSocket.getOutputStream());
BufferedReader inFromServer =
new BufferedReader(new InputStreamReader(
clientSocket.getInputStream()));
sentence = inFromUser.readLine();
outToServer.writeBytes(sentence + "\r\n");
modifiedSentence = inFromServer.readLine();
System.out.println("FROM SERVER: " +
modifiedSentence);
clientSocket.close();
So...when the program loads the console...I type
GET /staff/bbradley/200640/cs360/test1.txt
And I'm supposed to get what's at the URL:
http://www.utm.edu/staff/bbradley/200640/cs360/test1.txt
But Instead I just get the first line of the text...any ideas?Change the code to
import java.io.*;
import java.net.*;
class TCPClient {
public static void main(String argv[]) throws Exception
String sentence;
String modifiedSentence;
BufferedReader inFromUser = new BufferedReader(
new InputStreamReader(System.in));
Socket clientSocket = new Socket("www.utm.edu", 80);
DataOutputStream outToServer = new DataOutputStream(
clientSocket.getOutputStream());
BufferedReader inFromServer =
new BufferedReader(new InputStreamReader(
clientSocket.getInputStream()));
sentence = inFromUser.readLine();
outToServer.writeBytes(sentence + "\r\n");
modifiedSentence = inFromServer.readLine();
while(modifiedSentence!=null)
System.out.println("FROM SERVER: " +
modifiedSentence);
modifiedSentence = inFromServer.readLine();
clientSocket.close();
} -
How to program the simple tcp/ip connection?
I would like to know how to program in labview the simple tcp/ip connetion.
And is there some site with examples.Luciano Kan Horiuchi wrote:
> I would like to know how to program in labview the simple tcp/ip connetion.
> And is there some site with examples.
You should probably start with the examples that ship with LabVIEW. For a good
server-to-single-client example, check out Data Client.vi and Data Server.vi
from the shipping examples, and for a good server-to-multiple-client example,
try the Date Client.vi/Date Server.vi pair instead. All of these can be found
in the following VI library:
\examples\comm\tcpex.llb
or via the Search Examples interface in LabVIEW. There are certainly
additional examples on the NI site, but there's no better place to start than
with these.
Regards,
John Lum -
Need Help with Simple Chat Program
Hello Guys,
I'm fairly new to Java and I have a quick question regarding a simple chat program in java. My problem is that I have a simple chat program that runs from its own JFrame etc. Most of you are probably familiar with the code below, i got it from one of my java books. In any case, what I'm attempting to do is integrate this chat pane into a gui that i have created. I attempted to call an instace of the Client class from my gui program so that I can use the textfield and textarea contained in my app, but it will not allow me to do it. Would I need to integrate this code into the code for my Gui class. I have a simple program that contains chat and a game. The code for the Client is listed below.
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import javax.swing.*;
public class Client
extends JPanel {
public static void main(String[] args) throws IOException {
String name = args[0];
String host = args[1];
int port = Integer.parseInt(args[2]);
final Socket s = new Socket(host, port);
final Client c = new Client(name, s);
JFrame f = new JFrame("Client : " + name);
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
c.shutDown();
System.exit(0);
f.setSize(300, 300);
f.setLocation(100, 100);
f.setContentPane(c);
f.setVisible(true);
private String mName;
private JTextArea mOutputArea;
private JTextField mInputField;
private PrintWriter mOut;
public Client(final String name, Socket s)
throws IOException {
mName = name;
createUI();
wireNetwork(s);
wireEvents();
public void shutDown() {
mOut.println("");
mOut.close();
protected void createUI() {
setLayout(new BorderLayout());
mOutputArea = new JTextArea();
mOutputArea.setLineWrap(true);
mOutputArea.setEditable(false);
add(new JScrollPane(mOutputArea), BorderLayout.CENTER);
mInputField = new JTextField(20);
JPanel controls = new JPanel();
controls.add(mInputField);
add(controls, BorderLayout.SOUTH);
mInputField.requestFocus();
protected void wireNetwork(Socket s) throws IOException {
mOut = new PrintWriter(s.getOutputStream(), true);
final String eol = System.getProperty("line.separator");
new Listener(s.getInputStream()) {
public void processLine(String line) {
mOutputArea.append(line + eol);
mOutputArea.setCaretPosition(
mOutputArea.getDocument().getLength());
protected void wireEvents() {
mInputField.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
String line = mInputField.getText();
if (line.length() == 0) return;
mOut.println(mName + " : " + line);
mInputField.setText("");Thanks for ur help!i have moved BufferedReader outside the loop. I dont think i am getting exception as i can c the output once.What i am trying to do is repeat the process which i m getting once.What my method does is first one sends the packet to multicasting group (UDP) and other method receives the packets and prints.
-
Hi! I would like to implement a simple chat program for iphone (i know that many others still exist). My doubt is about the chat window. I need something like a view or a tableCell to add at the window every time i recieve or write a message, and the view where the conversation happens need to be "slidable"...how can i do this thing? Any suggestion?
There is no standard control that will help you do this. You will most likely want to implement a custom UIScrollView. Within that you will place custom controls programatically to render the conversation or just manage the offsets yourself and draw the text and graphics by overriding the drawRect method.
-
Is it possible to make an "internet" chat program?
I have already made a chat program for a LAN, but I want to somehow make it usable over the internet. Is there a way to make the program use your internet ip, instead of your lan ip?
Hello: I gott a similar trouble over writing an internet chat app. I have an app that works on a local server, works with a local database, i want it to work on internet, but i dont know how to do it, i also use a server app for replying client queries. I'm using sockets and i don't know how a client can works throught a LAN - proxy or router internet acces - to the app if i have to place it on a web server
-
hi guys,
I was wondering how one can create a chat program in abap. As its possible in Java & .Net why an abaper under estimate himself. Now here imagine a simple chat program where one can send some text from his SAP GUI which will appear on others SAP GUI and viceversa. Dont think about some messangers like yahoo or gtalk.(dont over estimate being an abaper)
So i developed two programs one to send text & other to receive text. Send prg. is module pool and receive prg. is a simple report which has timer class which gets data from table every second so user dont have to press any button to receive the message.
To start chat you have to run both programs in your GUI where from send program you enter your name in one text field and your message in other text field by pressing enter it gets update in table field(not every time it insert new record, it simply update previous so table size would not increase). As the person with whoem you are chatting is also running both programs, your message appears in 2nd program on his GUI & yours also. followed by your name.
Both chat programs works fine with more then two users also. i tried to combine both program in one screen so user can send & receive chat from one screen. but due to timer class used, its not possible as receive program keeps refreshing for every 1 second.
so i am wondering is thier any way to run one modulepool program & one report in a single screen. some thing like screen splitting or docking???
you are welcome to share your ideas regarding chat in ABAP/4(release 4.7)
Regards,
SUDHIR MANJAREKARYes, thats right. There are few ABAP codes which you can find in the net and can improvise on that.
The program displays list of all users who are currently active on a list.
You can select user and select press button on the application tool bar to send a message.
Concerns here are: 1. The receiver cannot reply from the same popup. He has to run the program, select the user who has send message and reply. 2. You will not be able to see the entire message log.
For logging messages you can try creating standard text for tracking dialog between any two user and something of that sort.
regards,
S. Chandramouli. -
Hi everyone,
I'm writing a simple chat program as a assignment at my Uni. I get stucked with the client GUI. I want to create a GUI like that of Yahoo messenger which has a list of connected users displayed on the GUI. When u double click on the name of the user, u will get connected to that user. I have no idea about creating a GUI list like this one. Can anybody help me with this? Thanks in advance!There are many tutorials on this site; check the "tutorials" link on the column on the left.
Here are ones about GUIs:
http://developer.java.sun.com/developer/onlineTraining/GUI/
I'd suggest skipping over any tutorials prior to JDK 1.1 or even 1.2.
Read more recent ones. There have been significant improvements, especially w.r.t. event handling, between 1.0 and 1.1. -
Building a simple J2ME chat client (for own J2SE-based server) Threading Qs
Hi!
I am making my own simple chat / messenger service to use between a couple of friends over GPRS.
On the server side i have made a multi threaded TCP server that opens a new thread for each connecting client and stores these socket connections in a hashtable for access to send data between each thread.
So when a client logs on to the server, the server sends a printwriter message to all other clients informing them of what client connected, and the clients can put the username in its out-database. then the clients can send messages to each others using a simple, self build protocol.
All connection between clients/server happens over a simple printwriter on in/out streams.
Problem is: it works perfectly most of the time.... However, sometimes a message is mysteriously lost when transferred from the server to a client. Transfer from client to server works flawlessly. I am thinking that it might have something to do with the client side threading, or slow network transfer casuing a TCP read error.
Client structure is as following:
start-> Midlet class -> (press connect to server) -> new Client class (impl runnable) -> new thread(this) -> void run() sets up all connections and writers, waits in a while loop for messages from server and takes action according to message type. -> Button(send) uses output stream to send a message to server.
Do anyone have any suggestions on what I must consider when making a client that will simultaniously be able to listen for data from server as well as send data to server over 1 socket and slow mobile connection without causing any trouble?
More info can be provided if necessary.
Thank you!Building a simple J2ME chat client (for own J2SE-based server)a. i would like to say that this is a bl00dy brilliant idea. i mean ~ its been done before but building one yourself is quite thrilling.
b. are u using java 4 or java 5. ?
sometimes a message is mysteriously lost when transferred from the server to a client. Transfer from client to server works flawlessly.are you using push registry to recieve incoming connections.
i recommend using a StreamConnectionNotifier connection instead of just a socket connection. you could send your data (xml/plain text) just like a stream (tcp ofcourse). if you want to know how to use a StreamConnectionNotifier connection, here's how
try{
// listen at local port 789
StreamConnectionNotifier notify = (StreamConnectionNotifier) Connector.open(http://:789);
// infinite loop to get incoming connections
for(;;)
StreamConnection stream = notify.acceptandOpen(); // return a stream connection when a connection is made
InputStrean mystream = stream.openInputStream();
while(mystream!=-1)
mystream.read();
....cheers -
Ask help, How make my TCP server program stronger
I'm develop a simple c/s program using TCP.
I use recv (sock, buff, len, WAITALL) func recieving the message sent by client, if the client don't send enough lenth message, the server will block, how to resolve this problem.
I'm a network programming beginner, could you give me some advise and information, thanks.It would be useful for you to read
http://docs.sun.com/ab2/coll.45.13/NETP/
especially "Overview of Sockets" and "Socket Basics".
You can find there many code examples.
And the general way to deal with stream message size
is to put it into the message header. This will allow
the receiver first to read the message size, and then
the entire message.
Enjoy! -
I've been a C/C++ programmer most of my career and I'm tring to pick up Java. I'm having a little bit of difficulty trying to do something as simple as a TCP echo program. I can send a string from the client to the server, and the server will print out the string, but it doesn't send the response back the the client. When I look at it in the Eclipse debugger, it seems to get past the out.println(dataString) and back to the dataString = in.readLine(). Any ideas what might be going on?
Client
import java.io.*;
import java.net.*;
public class EchoClient {
public static void main(String[] args) throws IOException {
Socket echoSocket = null;
PrintWriter out = null;
BufferedReader in = null;
try {
echoSocket = new Socket("192.168.2.13", 12345);
out = new PrintWriter(echoSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(
echoSocket.getInputStream()));
} catch (UnknownHostException e) {
System.err.println("Don't know about host: taranis.");
System.exit(1);
} catch (IOException e) {
System.err.println("Couldn't get I/O for "
+ "the connection to: taranis.");
System.exit(1);
BufferedReader stdIn = new BufferedReader(
new InputStreamReader(System.in));
String userInput;
String response;
while ((userInput = stdIn.readLine()) != null) {
out.println(userInput);
response = in.readLine();
System.out.println("Recieved Back: " + response);
out.close();
in.close();
stdIn.close();
echoSocket.close();
}Server
import java.io.*;
import java.net.*;
public class EchoServer {
public static void main(String[] args) throws IOException {
ServerSocket echoSocket = null;
Socket connectedSocket = null;
PrintWriter out = null;
BufferedReader in = null;
String dataString;
try {
echoSocket = new ServerSocket(12345);
} catch (UnknownHostException e) {
System.err.println("Don't know about host");
System.exit(1);
System.out.println("Waiting for a connection...");
try{
connectedSocket = echoSocket.accept();
}catch(IOException e){
System.err.println("Error waiting for accept()");
System.exit(1);
in = new BufferedReader(new InputStreamReader(
connectedSocket.getInputStream()));
out = new PrintWriter(connectedSocket.getOutputStream());
System.out.println("Connected to " +
connectedSocket.getRemoteSocketAddress().toString());
while (true) {
if((dataString = in.readLine()) == null){
break;
System.out.println("Recieved: " + dataString);
out.println(dataString);
out.close();
in.close();
echoSocket.close();
connectedSocket.close();
}You might want to try calling out.flush() after out.println(dataString);
-
hello all.
now i've read through alot of articles in the forum on this topic and i still can't figure it out. i have a multiple client server program and i can only send to all clients once they have sent something to the server first. any help is appreciated.
the code is here:
http://www.geocities.com/macca_thomo/program.zipPlease ignore the SPAM from richard west for his low grade wizard solutions forum. There are plenty of good examples on this forum, or do a search on the web.
When you say that your server won't reply until it the client sends something, do you mean that the server can send only one reply per input from the client? Is each client represented by a single thread which is waiting for input when you want it to send? Here's an example of a simple multithreaded chat server that I posted a few weeks ago on this forum: Simple Socket Server. It uses two threads per client to keep the communication going in both directions without needing to get complicated of do polling. -
After a few days work, I have completed the mian voice chat program. I know there are so many people like me that wants that. I post these program. i will complete gui work later. and there is a problem in the program. if the speaking one do not speak for a while, the listening client will hear noise. Can some one help me.
package com.longshine.voice;
import java.io.*;
import java.net.*;
import java.util.*;
public class Server
// The ServerSocket we'll use for accepting new connections
private ServerSocket ss;
// A mapping from sockets to DataOutputStreams. This will
// help us avoid having to create a DataOutputStream each time
// we want to write to a stream.
private Hashtable outputStreams = new Hashtable();
final int bufSize = 16384;
//current speak_man
private int speakman=-1;
// Constructor and while-accept loop all in one.
public Server( int port ) throws IOException {
// All we have to do is listen
listen( port );
private void listen( int port ) throws IOException {
// Create the ServerSocket
ss = new ServerSocket( port );
// Tell the world we're ready to go
System.out.println( "Listening on "+ss );
// Keep accepting connections forever
while (true) {
// Grab the next incoming connection
Socket s = ss.accept();
// Tell the world we've got it
System.out.println( "Connection from "+s );
// Create a DataOutputStream for writing data to the
// other side
DataOutputStream dout = new DataOutputStream( s.getOutputStream() );
// Save this stream so we don't need to make it again
outputStreams.put( s, dout );
// Create a new thread for this connection, and then forget
// about it
new VoiceServer( this, s );
// Get an enumeration of all the OutputStreams, one for each client
// connected to us
Enumeration getOutputStreams() {
return outputStreams.elements();
// Send a message to all clients (utility routine)
void sendToAll( byte[] voice ,Socket socket) {
// We synchronize on this because another thread might be
// calling removeConnection() and this would screw us up
// as we tried to walk through the list
synchronized( outputStreams ) {
// For each client ...
for (Enumeration e = outputStreams.keys(); e.hasMoreElements(); ) {
// ... get the output stream ...
Socket tmp=(Socket)e.nextElement();
if(!tmp.equals(socket))
try {
DataOutputStream dout = new DataOutputStream(tmp.getOutputStream());
// ... and send the message
dout.write(voice,0,44096);
dout.flush();
} catch( IOException ie ) { System.out.println( ie ); }
// Remove a socket, and it's corresponding output stream, from our
// list. This is usually called by a connection thread that has
// discovered that the connectin to the client is dead.
void removeConnection( Socket s ) {
// Synchronize so we don't mess up sendToAll() while it walks
// down the list of all output streamsa
synchronized( outputStreams ) {
// Tell the world
System.out.println( "Removing connection to "+s );
// Remove it from our hashtable/list
outputStreams.remove( s );
// Make sure it's closed
try {
s.close();
} catch( IOException ie ) {
System.out.println( "Error closing "+s );
ie.printStackTrace();
// Main routine
// Usage: java Server <port>
static public void main( String args[] ) throws Exception {
// Get the port # from the command line
int port = Integer.parseInt( args[0] );
// Create a Server object, which will automatically begin
// accepting connections.
new Server( port );
package com.longshine.voice;
import java.net.*;
import java.io.*;
import java.sql.*;
import java.io.*;
import java.net.*;
public class VoiceServer extends Thread
// The Server that spawned us
private Server server;
final int bufSize = 16384;
// The Socket connected to our client
private Socket socket;
// Constructor.
public VoiceServer( Server server, Socket socket ) {
// Save the parameters
this.server = server;
this.socket = socket;
// Start up the thread
start();
// This runs in a separate thread when start() is called in the
// constructor.
public void run() {
try {
// Create a DataInputStream for communication; the client
// is using a DataOutputStream to write to us
DataInputStream din = new DataInputStream( socket.getInputStream() );
byte[] voice=new byte[44096];
// Over and over, forever ...
while (true) {
// ... read the next message ...
// int bytes = din.read(voice,0,44096);
int bytes = din.read(voice);
// ... and have the server send it to all clients
server.sendToAll(voice,socket);
} catch( EOFException ie ) {
// This doesn't need an error message
} catch( IOException ie ) {
// This does; tell the world!
ie.printStackTrace();
} finally {
// The connection is closed for one reason or another,
// so have the server dealing with it
server.removeConnection( socket );
package com.longshine.voice;
import java.io.*;
import java.net.*;
public class Client {
private String host="";
private String port="";
private Socket socket;
private DataOutputStream dout;
private DataInputStream din;
private Capture capture=null;
private Play play=null;
public Client(String host,String port) {
this.host=host;
this.port=port;
public void init()
try
socket = new Socket( host, Integer.parseInt(port));
din = new DataInputStream( socket.getInputStream() );
dout = new DataOutputStream( socket.getOutputStream());
capture=new Capture(dout);
play=new Play(din);
catch(Exception e)
e.printStackTrace();
public static void main(String[] args) {
Client client = new Client("172.18.220.176","5678");
client.init();
if(args[0].equalsIgnoreCase("say"))
client.capture.start();
if(args[0].equalsIgnoreCase("hear"))
client.play.start();
package com.longshine.voice;
import java.io.*;
import java.util.Vector;
import java.util.Enumeration;
import javax.sound.sampled.*;
import java.text.*;
import java.net.*;
public class Play implements Runnable {
SourceDataLine line;
Thread thread;
String errStr=null;
DataInputStream in=null;
AudioInputStream audioInputStream;
final int bufSize = 16384;
int duration=0;
public Play(DataInputStream in)
this.in=in;
public void start() {
errStr = null;
thread = new Thread(this);
thread.setName("Playback");
thread.start();
public void stop() {
thread = null;
private void shutDown(String message) {
if ((errStr = message) != null) {
System.err.println(errStr);
if (thread != null) {
thread = null;
public void createAudioInputStream() {
if (in != null ) {
try {
errStr = null;
java.io.BufferedInputStream oin = new java.io.BufferedInputStream(in);
audioInputStream = AudioSystem.getAudioInputStream(oin);
} catch (Exception ex) {
ex.printStackTrace();
} else {
public void run() {
// reload the file if loaded by file
if (in != null) {
// createAudioInputStream();
// make sure we have something to play
// if (audioInputStream == null) {
// shutDown("No loaded audio to play back");
// return;
// reset to the beginnning of the stream
// try {
// audioInputStream.reset();
// } catch (Exception e) {
// shutDown("Unable to reset the stream\n" + e);
// return;
// get an AudioInputStream of the desired format for playback
AudioFormat format = getFormat();
audioInputStream=new AudioInputStream(in, format, AudioSystem.NOT_SPECIFIED);
AudioInputStream playbackInputStream = AudioSystem.getAudioInputStream(format, audioInputStream);
if (playbackInputStream == null) {
shutDown("Unable to convert stream of format " + audioInputStream + " to format " + format);
return;
// define the required attributes for our line,
// and make sure a compatible line is supported.
DataLine.Info info = new DataLine.Info(SourceDataLine.class,
format);
if (!AudioSystem.isLineSupported(info)) {
shutDown("Line matching " + info + " not supported.");
return;
// get and open the source data line for playback.
try {
line = (SourceDataLine) AudioSystem.getLine(info);
line.open(format, bufSize);
} catch (LineUnavailableException ex) {
shutDown("Unable to open the line: " + ex);
return;
// play back the captured audio data
int frameSizeInBytes = format.getFrameSize();
int bufferLengthInFrames = line.getBufferSize() / 8;
int bufferLengthInBytes = bufferLengthInFrames * frameSizeInBytes;
byte[] data = new byte[bufferLengthInBytes];
int numBytesRead = 0;
// start the source data line
line.start();
while (thread != null) {
try {
if ((numBytesRead = playbackInputStream.read(data)) == -1) {
break;
int numBytesRemaining = numBytesRead;
while (numBytesRemaining > 0 ) {
numBytesRemaining -= line.write(data, 0, numBytesRemaining);
} catch (Exception e) {
shutDown("Error during playback: " + e);
break;
// we reached the end of the stream. let the data play out, then
// stop and close the line.
if (thread != null) {
line.drain();
line.stop();
line.close();
line = null;
shutDown(null);
public AudioFormat getFormat() {
AudioFormat.Encoding encoding = AudioFormat.Encoding.ULAW;
String encString = "linear";
float rate = Float.valueOf("44100").floatValue();
int sampleSize = 16;
String signedString = "signed";
boolean bigEndian = true;
int channels = 2;
if (encString.equals("linear")) {
if (signedString.equals("signed")) {
encoding = AudioFormat.Encoding.PCM_SIGNED;
} else {
encoding = AudioFormat.Encoding.PCM_UNSIGNED;
} else if (encString.equals("alaw")) {
encoding = AudioFormat.Encoding.ALAW;
return new AudioFormat(encoding, rate, sampleSize,
channels, (sampleSize/8)*channels, rate, bigEndian);
} // End class Playback
package com.longshine.voice;
import java.io.*;
import java.util.Vector;
import java.util.Enumeration;
import javax.sound.sampled.*;
import java.text.*;
import java.net.*;
public class Capture implements Runnable {
TargetDataLine line;
Thread thread;
String errStr=null;
DataOutputStream out=null;
AudioInputStream audioInputStream;
final int bufSize = 16384;
int duration=0;
public Capture(DataOutputStream out)
this.out=out;
public void start() {
errStr = null;
thread = new Thread(this);
thread.setName("Playback");
thread.start();
public void stop() {
thread = null;
private void shutDown(String message) {
if ((errStr = message) != null) {
System.out.println(errStr);
if (thread != null) {
thread = null;
public AudioFormat getFormat() {
AudioFormat.Encoding encoding = AudioFormat.Encoding.ULAW;
String encString = "linear";
float rate = Float.valueOf("44100").floatValue();
int sampleSize = 16;
String signedString = "signed";
boolean bigEndian = true;
int channels = 2;
if (encString.equals("linear")) {
if (signedString.equals("signed")) {
encoding = AudioFormat.Encoding.PCM_SIGNED;
} else {
encoding = AudioFormat.Encoding.PCM_UNSIGNED;
} else if (encString.equals("alaw")) {
encoding = AudioFormat.Encoding.ALAW;
return new AudioFormat(encoding, rate, sampleSize,
channels, (sampleSize/8)*channels, rate, bigEndian);
public void run() {
duration = 0;
audioInputStream = null;
// define the required attributes for our line,
// and make sure a compatible line is supported.
AudioFormat format = getFormat();
DataLine.Info info = new DataLine.Info(TargetDataLine.class,
format);
if (!AudioSystem.isLineSupported(info)) {
shutDown("Line matching " + info + " not supported.");
return;
// get and open the target data line for capture.
try {
line = (TargetDataLine) AudioSystem.getLine(info);
line.open(format, line.getBufferSize());
} catch (LineUnavailableException ex) {
shutDown("Unable to open the line: " + ex);
return;
} catch (SecurityException ex) {
shutDown(ex.toString());
return;
} catch (Exception ex) {
shutDown(ex.toString());
return;
// play back the captured audio data
int frameSizeInBytes = format.getFrameSize();
int bufferLengthInFrames = line.getBufferSize() / 8;
int bufferLengthInBytes = bufferLengthInFrames * frameSizeInBytes;
byte[] data = new byte[bufferLengthInBytes];
int numBytesRead;
line.start();
try
while (thread != null) {
if((numBytesRead = line.read(data, 0, bufferLengthInBytes)) == -1) {
break;
if(data.length>0)
out.write(data, 0, numBytesRead);
out.flush();
catch (Exception e)
e.printStackTrace();
// we reached the end of the stream. stop and close the line.
line.stop();
line.close();
line = null;
// stop and close the output stream
try {
out.flush();
out.close();
} catch (IOException ex) {
ex.printStackTrace();
} // End class CaptureAfter a few days work, I have completed the mian voice chat program. I know there are so many people like me that wants that. I post these program. i will complete gui work later. and there is a problem in the program. if the speaking one do not speak for a while, the listening client will hear noise. Can some one help me.
package com.longshine.voice;
import java.io.*;
import java.net.*;
import java.util.*;
public class Server
// The ServerSocket we'll use for accepting new connections
private ServerSocket ss;
// A mapping from sockets to DataOutputStreams. This will
// help us avoid having to create a DataOutputStream each time
// we want to write to a stream.
private Hashtable outputStreams = new Hashtable();
final int bufSize = 16384;
//current speak_man
private int speakman=-1;
// Constructor and while-accept loop all in one.
public Server( int port ) throws IOException {
// All we have to do is listen
listen( port );
private void listen( int port ) throws IOException {
// Create the ServerSocket
ss = new ServerSocket( port );
// Tell the world we're ready to go
System.out.println( "Listening on "+ss );
// Keep accepting connections forever
while (true) {
// Grab the next incoming connection
Socket s = ss.accept();
// Tell the world we've got it
System.out.println( "Connection from "+s );
// Create a DataOutputStream for writing data to the
// other side
DataOutputStream dout = new DataOutputStream( s.getOutputStream() );
// Save this stream so we don't need to make it again
outputStreams.put( s, dout );
// Create a new thread for this connection, and then forget
// about it
new VoiceServer( this, s );
// Get an enumeration of all the OutputStreams, one for each client
// connected to us
Enumeration getOutputStreams() {
return outputStreams.elements();
// Send a message to all clients (utility routine)
void sendToAll( byte[] voice ,Socket socket) {
// We synchronize on this because another thread might be
// calling removeConnection() and this would screw us up
// as we tried to walk through the list
synchronized( outputStreams ) {
// For each client ...
for (Enumeration e = outputStreams.keys(); e.hasMoreElements(); ) {
// ... get the output stream ...
Socket tmp=(Socket)e.nextElement();
if(!tmp.equals(socket))
try {
DataOutputStream dout = new DataOutputStream(tmp.getOutputStream());
// ... and send the message
dout.write(voice,0,44096);
dout.flush();
} catch( IOException ie ) { System.out.println( ie ); }
// Remove a socket, and it's corresponding output stream, from our
// list. This is usually called by a connection thread that has
// discovered that the connectin to the client is dead.
void removeConnection( Socket s ) {
// Synchronize so we don't mess up sendToAll() while it walks
// down the list of all output streamsa
synchronized( outputStreams ) {
// Tell the world
System.out.println( "Removing connection to "+s );
// Remove it from our hashtable/list
outputStreams.remove( s );
// Make sure it's closed
try {
s.close();
} catch( IOException ie ) {
System.out.println( "Error closing "+s );
ie.printStackTrace();
// Main routine
// Usage: java Server <port>
static public void main( String args[] ) throws Exception {
// Get the port # from the command line
int port = Integer.parseInt( args[0] );
// Create a Server object, which will automatically begin
// accepting connections.
new Server( port );
package com.longshine.voice;
import java.net.*;
import java.io.*;
import java.sql.*;
import java.io.*;
import java.net.*;
public class VoiceServer extends Thread
// The Server that spawned us
private Server server;
final int bufSize = 16384;
// The Socket connected to our client
private Socket socket;
// Constructor.
public VoiceServer( Server server, Socket socket ) {
// Save the parameters
this.server = server;
this.socket = socket;
// Start up the thread
start();
// This runs in a separate thread when start() is called in the
// constructor.
public void run() {
try {
// Create a DataInputStream for communication; the client
// is using a DataOutputStream to write to us
DataInputStream din = new DataInputStream( socket.getInputStream() );
byte[] voice=new byte[44096];
// Over and over, forever ...
while (true) {
// ... read the next message ...
// int bytes = din.read(voice,0,44096);
int bytes = din.read(voice);
// ... and have the server send it to all clients
server.sendToAll(voice,socket);
} catch( EOFException ie ) {
// This doesn't need an error message
} catch( IOException ie ) {
// This does; tell the world!
ie.printStackTrace();
} finally {
// The connection is closed for one reason or another,
// so have the server dealing with it
server.removeConnection( socket );
package com.longshine.voice;
import java.io.*;
import java.net.*;
public class Client {
private String host="";
private String port="";
private Socket socket;
private DataOutputStream dout;
private DataInputStream din;
private Capture capture=null;
private Play play=null;
public Client(String host,String port) {
this.host=host;
this.port=port;
public void init()
try
socket = new Socket( host, Integer.parseInt(port));
din = new DataInputStream( socket.getInputStream() );
dout = new DataOutputStream( socket.getOutputStream());
capture=new Capture(dout);
play=new Play(din);
catch(Exception e)
e.printStackTrace();
public static void main(String[] args) {
Client client = new Client("172.18.220.176","5678");
client.init();
if(args[0].equalsIgnoreCase("say"))
client.capture.start();
if(args[0].equalsIgnoreCase("hear"))
client.play.start();
package com.longshine.voice;
import java.io.*;
import java.util.Vector;
import java.util.Enumeration;
import javax.sound.sampled.*;
import java.text.*;
import java.net.*;
public class Play implements Runnable {
SourceDataLine line;
Thread thread;
String errStr=null;
DataInputStream in=null;
AudioInputStream audioInputStream;
final int bufSize = 16384;
int duration=0;
public Play(DataInputStream in)
this.in=in;
public void start() {
errStr = null;
thread = new Thread(this);
thread.setName("Playback");
thread.start();
public void stop() {
thread = null;
private void shutDown(String message) {
if ((errStr = message) != null) {
System.err.println(errStr);
if (thread != null) {
thread = null;
public void createAudioInputStream() {
if (in != null ) {
try {
errStr = null;
java.io.BufferedInputStream oin = new java.io.BufferedInputStream(in);
audioInputStream = AudioSystem.getAudioInputStream(oin);
} catch (Exception ex) {
ex.printStackTrace();
} else {
public void run() {
// reload the file if loaded by file
if (in != null) {
// createAudioInputStream();
// make sure we have something to play
// if (audioInputStream == null) {
// shutDown("No loaded audio to play back");
// return;
// reset to the beginnning of the stream
// try {
// audioInputStream.reset();
// } catch (Exception e) {
// shutDown("Unable to reset the stream\n" + e);
// return;
// get an AudioInputStream of the desired format for playback
AudioFormat format = getFormat();
audioInputStream=new AudioInputStream(in, format, AudioSystem.NOT_SPECIFIED);
AudioInputStream playbackInputStream = AudioSystem.getAudioInputStream(format, audioInputStream);
if (playbackInputStream == null) {
shutDown("Unable to convert stream of format " + audioInputStream + " to format " + format);
return;
// define the required attributes for our line,
// and make sure a compatible line is supported.
DataLine.Info info = new DataLine.Info(SourceDataLine.class,
format);
if (!AudioSystem.isLineSupported(info)) {
shutDown("Line matching " + info + " not supported.");
return;
// get and open the source data line for playback.
try {
line = (SourceDataLine) AudioSystem.getLine(info);
line.open(format, bufSize);
} catch (LineUnavailableException ex) {
shutDown("Unable to open the line: " + ex);
return;
// play back the captured audio data
int frameSizeInBytes = format.getFrameSize();
int bufferLengthInFrames = line.getBufferSize() / 8;
int bufferLengthInBytes = bufferLengthInFrames * frameSizeInBytes;
byte[] data = new byte[bufferLengthInBytes];
int numBytesRead = 0;
// start the source data line
line.start();
while (thread != null) {
try {
if ((numBytesRead = playbackInputStream.read(data)) == -1) {
break;
int numBytesRemaining = numBytesRead;
while (numBytesRemaining > 0 ) {
numBytesRemaining -= line.write(data, 0, numBytesRemaining);
} catch (Exception e) {
shutDown("Error during playback: " + e);
break;
// we reached the end of the stream. let the data play out, then
// stop and close the line.
if (thread != null) {
line.drain();
line.stop();
line.close();
line = null;
shutDown(null);
public AudioFormat getFormat() {
AudioFormat.Encoding encoding = AudioFormat.Encoding.ULAW;
String encString = "linear";
float rate = Float.valueOf("44100").floatValue();
int sampleSize = 16;
String signedString = "signed";
boolean bigEndian = true;
int channels = 2;
if (encString.equals("linear")) {
if (signedString.equals("signed")) {
encoding = AudioFormat.Encoding.PCM_SIGNED;
} else {
encoding = AudioFormat.Encoding.PCM_UNSIGNED;
} else if (encString.equals("alaw")) {
encoding = AudioFormat.Encoding.ALAW;
return new AudioFormat(encoding, rate, sampleSize,
channels, (sampleSize/8)*channels, rate, bigEndian);
} // End class Playback
package com.longshine.voice;
import java.io.*;
import java.util.Vector;
import java.util.Enumeration;
import javax.sound.sampled.*;
import java.text.*;
import java.net.*;
public class Capture implements Runnable {
TargetDataLine line;
Thread thread;
String errStr=null;
DataOutputStream out=null;
AudioInputStream audioInputStream;
final int bufSize = 16384;
int duration=0;
public Capture(DataOutputStream out)
this.out=out;
public void start() {
errStr = null;
thread = new Thread(this);
thread.setName("Playback");
thread.start();
public void stop() {
thread = null;
private void shutDown(String message) {
if ((errStr = message) != null) {
System.out.println(errStr);
if (thread != null) {
thread = null;
public AudioFormat getFormat() {
AudioFormat.Encoding encoding = AudioFormat.Encoding.ULAW;
String encString = "linear";
float rate = Float.valueOf("44100").floatValue();
int sampleSize = 16;
String signedString = "signed";
boolean bigEndian = true;
int channels = 2;
if (encString.equals("linear")) {
if (signedString.equals("signed")) {
encoding = AudioFormat.Encoding.PCM_SIGNED;
} else {
encoding = AudioFormat.Encoding.PCM_UNSIGNED;
} else if (encString.equals("alaw")) {
encoding = AudioFormat.Encoding.ALAW;
return new AudioFormat(encoding, rate, sampleSize,
channels, (sampleSize/8)*channels, rate, bigEndian);
public void run() {
duration = 0;
audioInputStream = null;
// define the required attributes for our line,
// and make sure a compatible line is supported.
AudioFormat format = getFormat();
DataLine.Info info = new DataLine.Info(TargetDataLine.class,
format);
if (!AudioSystem.isLineSupported(info)) {
shutDown("Line matching " + info + " not supported.");
return;
// get and open the target data line for capture.
try {
line = (TargetDataLine) AudioSystem.getLine(info);
line.open(format, line.getBufferSize());
} catch (LineUnavailableException ex) {
shutDown("Unable to open the line: " + ex);
return;
} catch (SecurityException ex) {
shutDown(ex.toString());
return;
} catch (Exception ex) {
shutDown(ex.toString());
return;
// play back the captured audio data
int frameSizeInBytes = format.getFrameSize();
int bufferLengthInFrames = line.getBufferSize() / 8;
int bufferLengthInBytes = bufferLengthInFrames * frameSizeInBytes;
byte[] data = new byte[bufferLengthInBytes];
int numBytesRead;
line.start();
try
while (thread != null) {
if((numBytesRead = line.read(data, 0, bufferLengthInBytes)) == -1) {
break;
if(data.length>0)
out.write(data, 0, numBytesRead);
out.flush();
catch (Exception e)
e.printStackTrace();
// we reached the end of the stream. stop and close the line.
line.stop();
line.close();
line = null;
// stop and close the output stream
try {
out.flush();
out.close();
} catch (IOException ex) {
ex.printStackTrace();
} // End class Capture -
Problems with a simple stop watch program
I would appreciate help sorting out a problem with a simple stop watch program. The problem is that it throws up inappropriate values. For example, the first time I ran it today it showed the best time at 19 seconds before the actual time had reached 2 seconds. I restarted the program and it ran correctly until about the thirtieth time I started it again when it was going okay until the display suddenly changed to something like '-50:31:30:50-'. I don't have screenshot because I had twenty thirteen year olds suddenly yelling at me that it was wrong. I clicked 'Stop' and then 'Start' again and it ran correctly.
I have posted the whole code (minus the GUI section) because I want you to see that the program is very, very simple. I can't see where it could go wrong. I would appreciate any hints.
public class StopWatch extends javax.swing.JFrame implements Runnable {
int startTime, stopTime, totalTime, bestTime;
private volatile Thread myThread = null;
/** Creates new form StopWatch */
public StopWatch() {
startTime = 0;
stopTime = 0;
totalTime = 0;
bestTime = 0;
initComponents();
public void run() {
Thread thisThread = Thread.currentThread();
while(myThread == thisThread) {
try {
Thread.sleep(100);
getEnd();
} catch (InterruptedException e) {}
public void start() {
if(myThread == null) {
myThread = new Thread(this);
myThread.start();
public void getStart() {
Calendar now = Calendar.getInstance();
startTime = (now.get(Calendar.MINUTE) * 60) + now.get(Calendar.SECOND);
public void getEnd() {
Calendar now1 = Calendar.getInstance();
stopTime = (now1.get(Calendar.MINUTE) * 60) + now1.get(Calendar.SECOND);
totalTime = stopTime - startTime;
setLabel();
if(bestTime < totalTime) bestTime = totalTime;
public void setLabel() {
if((totalTime % 60) < 10) {
jLabel1.setText(""+totalTime/60+ ":0"+(totalTime % 60));
} else {
jLabel1.setText(""+totalTime/60 + ":"+(totalTime % 60));
if((bestTime % 60) < 10) {
jLabel3.setText(""+bestTime/60+ ":0"+(bestTime % 60));
} else {
jLabel3.setText(""+bestTime/60 + ":"+(bestTime % 60));
private void ButtonClicked(java.awt.event.ActionEvent evt) {
JButton temp = (JButton) evt.getSource();
if(temp.equals(jButton1)) {
start();
getStart();
if(temp.equals(jButton2)) {
getEnd();
myThread = null;
* @param args the command line arguments
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new StopWatch().setVisible(true);
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JPanel jPanel1;
// End of variables declaration
}Although I appreciate this information, it still doesn't actually solve the problem. I can't see an error in the logic (or the code). The fact that the formatting works most of the time suggests that the problem does not lie there. As well, I use the same basic code for other time related displays e.g. countdown timers where the user sets a maximum time and the computer stops when zero is reached. I haven't had an error is these programs.
For me, it is such a simple program and the room for errors seem small. I am guessing that I have misunderstood something about dates, but I obviously don't know.
Again, thank you for taking the time to look at the problem and post a reply.
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