Listen socket
Hello,
Can a listen socket be used for multiple webservers? Is it necessary to have a listen socket for individual virtual server?
Multiple listen sockets can use the same IP address, but they must be listening on different ports.
Multiple listen sockets can use the same port as long as the IP addresses are different.
Please verify the doc section about this with what you want to make exactly ===>
http://docs.sun.com/source/819-0130/agvirtual.html#wp1011171
Similar Messages
-
Changes are not saved under 'listen sockets' - Webserver 6.1 SP2
Hi all,
I'm running Webserver 6.1 SP2 on Solaris 9 and face a strange behaviour when I make changes under 'Listen sockets'. I want to enable nearly everything regarding SSL2 and SSL3 to serve older IE browser versions.
My config is like
SSL Version 2 - [enabled]
Use the default set of SSL version 2 ciphers [enabled]
<here I check every checkbox>
<also with SSL Version 3 and TLS Ciphers>
Then I choose OK - "listen sockets edited" - Apply changes - the server gets restarted.
But when I view my changes again I see that
SSL Version 2 [enabled] ... (which is ok )
<but here all following checkboxes are disabled>
Mmmh, strange.
Because of that I still can't connect with IE5.0 SSL2, SSL3 enabled (simulating a customer with an older version).
The error log says "...SSLv2 is on, but no SSLv2 ciphers are enabled. SSLv2 connections will fail."
But the checkbox for SSL2 is enabled!
Someone else with this situation??
Greetings NickIt's an admin gui bug you are running into. The admin gui is not making the proper config changes into the server.xml for turning on the SSL2 ciphers.
Workaround: edit your server.xml file, find the line for SSLPARAMS and look for the ciphers for sslv2 and change all '-' signs to '+' to turn on the sslv2 ciphers. -
Listening socket class freezes my program
i originaly created a listening socket in my main gui class but everytime i execute it, my gui appears with no visible components inside and freezes. i am not able to close the gui window by clicking on the x button at teh top right hand corner.
i then removed my listening socket and made a new class altogether that listens to socket connection. i get the same problem when i execute both my gui and listening socket class. any suggestions?
heres my socket listening class
package icomm;
import java.net.*;
import java.io.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class listening {
/** Creates a new instance of listening */
public listening() {
public void listeningSocket()
ServerSocket server = null;
boolean listening = true;
try
//listen in port 4444;
server = new ServerSocket(14);
catch(IOException x)
JOptionPane.showMessageDialog(null, "cannot listen to port 4444", null, JOptionPane.ERROR_MESSAGE);
while(true)
ChatDialog w;
try
w = new ChatDialog(server.accept());
Thread t = new Thread(w);
w.setVisible(true);
t.start();
// server.close();
catch(IOException x)
JOptionPane.showMessageDialog(null, "could not open chat window", null, JOptionPane.ERROR_MESSAGE);
}and here is the code that launches the gui and the listening class from my login button..
//laod main gui
show_main_gui(text_username.getText());
//run listening socket
listening listen = new listening();
listen.listeningSocket();you do not need any thread for this - the socket will not block your frame. here is an example which works:
import java.net.ServerSocket;
import javax.swing.JFrame;
public class Sockframe extends JFrame{
public Sockframe(){
super("Socket using Application");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(100,100);
* @param args
public static void main(String[] args) {
// show new Frame
Sockframe f = new Sockframe();
f.setVisible(true);
try{
// do socket stuff
ServerSocket s = new ServerSocket(4567);
s.accept();
} catch(Exception exc){
exc.printStackTrace();
}Did you provide some default close operation for the frame? The frame needs this to know how to behave when the X-button os pressed. -
n SUN Webserver6.1, Listen socket(port) 80, 8080, and 8888 are
enabled. But after created some virtual servers, I would like to
dedicate port 8080 to one virtual server and port 8888 to another one.
But it seems that I cannot do this. Even in the server.xml file I saw
that port 8080 is only used by one virtual server, but this virtual
server still response to port 8888. Just wonder why? or say can I setup
that one virtue server is only response to one por and how?
Another question is: in the SUN Webserver 6.1 documentation, it says "
if you want to create a listen socket for IP-address-based virtual
servers, the IP address must be 0.0.0.0, ANY, any or INADDR_ANY,
meaning it listens on all IP address on that port."
Does that mean in an IP-based virutal server, cannot use a specific IP
when creating a listen socket? I am a bit confusing here. IP base
virtual server is that you need to specifiy an IP when creating listen
socket, isn't it?
Thanks for advice!You can define virtuals in your server.xml file manually. You can have one virtual listening to one or many ports(LS) and you can have several virtuals listening to the same port. And you can assign IP address to virtual as well.
For example with YourServerIP listening to 4 ports you can do the following:
<LS id="ls1" ip="YourServerIP" port="8088" security="off" servername="YourServerName" defaultvs="YourDefaultVS"/>
<LS id="ls2" ip="YourServerIP" port="8089" security="off" servername="YourServerName" defaultvs="YourDefaultVS"/>
<LS id="ls3" ip="YourServerIP" port="8080" security="off" servername="YourServerName" defaultvs="VS3"/>
<LS id="ls4" ip="YourServerIP" port="80" security="off" servername="YourServerName" defaultvs="VS5"/>
<VSCLASS id="vsclass1" objectfile="obj.conf">
<VS id="YourDefaultVS" connections="ls1 ls2" mime="mime1" aclids="acl1" urlhosts="www.YourURL.com">
<PROPERTY name="docroot" value="/PathToYourDocumentRoot1"/>
<USERDB id="default"/>
</VS>
<VS id="VS3" connections="ls3" mime="mime1" aclids="acl1" urlhosts="www.AnotherURL.com">
<PROPERTY name="docroot" value="/PathToYourDocumentRoot2"/>
<USERDB id="default"/>
</VS>
<VS id="VS4" connections="ls4" mime="mime1" aclids="acl1" urlhosts="YourServerIP">
<PROPERTY name="docroot" value="/PathToYourDocumentRoot3"/>
<USERDB id="default"/>
</VS>
<VS id="VS5" connections="ls4" mime="mime1" aclids="acl1" urlhosts="www.YetAnotherURL.com YetAnotherURL.com">
<PROPERTY name="docroot" value="/PathToYourDocumentRoot4"/>
<USERDB id="default"/>
</VS>
<VS id="VS6" connections="ls4" mime="mime1" aclids="acl1" urlhosts="www.AsManyURLsAsNeddedSeparatedBySpace.com">
<PROPERTY name="docroot" value="/PathToYourDocumentRoot5"/>
<USERDB id="default"/>
</VS>
</VSCLASS>
Hope it helps.
Alexander aka ttalex -
Cann't enable security on listen socket
I create a listen socket on port 6666. I would like to enable security on this port. But the pull down menu of the "security" menu at "add Listen Socket" page only has "disable". why? how to fix it?
Actually all the listen sockets cannot enable security. only has "disable" to choose
Thanks for advice!Did you already create the security database and install a certificate? You may need a cert database with certs installed before you try to enable security on the listen sockets. Here are the docs:
http://docs.sun.com/source/819-0130-10/agcert.html
Thanks
Manish -
Remote debug listening socket failure
I am getting the following error when starting Weblogic with remote debugging enabled:
Error [4] in accept() call!
err:: Interrupted system call
Socket transport failed to init.
dt_socket transport error; accept failed, rc = -1
My java startup parameters include:
-Xdebug -Xnoagent -Xms64m -Xmx64m -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,server=y,address=3998
,suspend=n
I am using JDK1.2.2 and am running with the JDK opposed to JRE which I understand
is required when trying to remote debug with 1.2. I have $JPDA/lib/sparc in my
LD_LIBRARY_PATH and jpda.jar in my classpath.
Can anyone help please?Problem resolved, thanks.
"Moby" <[email protected]> wrote:
>
I am getting the following error when starting Weblogic with remote debugging
enabled:
Error [4] in accept() call!
err:: Interrupted system call
Socket transport failed to init.
dt_socket transport error; accept failed, rc = -1
My java startup parameters include:
-Xdebug -Xnoagent -Xms64m -Xmx64m -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,server=y,address=3998
,suspend=n
I am using JDK1.2.2 and am running with the JDK opposed to JRE which
I understand
is required when trying to remote debug with 1.2. I have $JPDA/lib/sparc
in my
LD_LIBRARY_PATH and jpda.jar in my classpath.
Can anyone help please? -
Stop a socket listening thread?
Hi all,
I'm a newbie at java socket programming, and i have a problem in implementing realibility over UDP.
This is the pseudocode of my program.
class ChatProtocol
DatagramSocket socket;
Thread alwaysListeningSocket;
public ChatProtocol(parameter)
// Some setting up
] this.alwaysListeningSocket = this;
public void run()
DatagramPacket packet = new DatagramPacket(parameter);
socket.receive(packet);
. // Process the incoming messages
public void send(message)
// Chunking the message into datagramPackets[]
// Thread for listening for acknowledgement for each will-be-sent packets
Thread ackListener = new Thread(new Runnable()
public void run()
DatagramPacket ackPacket = new DatagramPacket(parameter);
socket.receive(ackPacket);
. // Processing the acknowledgement
ackListener.start(); // Start listening for ack
for (int i = 0; i < datagramPackets.length; i++)
socket.send( datagramPacktes[i] );
. // Another process
}I have an always listening socket in my program, which is done by invoking socket.receive() inside a thread
And i have a send method, which will send messages thorugh the same socket.
The problem is, i have to listen for acknowledgement for each sent packets through the same socket.
This is done by invoking socket.receive(), but if i want to invoke this method, i have to stop the previous thread first.
Is this possible, since stop() method in Thread class is deprecated?So you can't predict the ordering of ACKs and other messages. You can't even predict the ordering of ACKs even if there are np other messagesI have a sequence number put into the datagram packets.
This is the format of my packets.
Packet length 16 bytes, consist of :
- Packet type, 1 byte (This will determine if the packets is a message or an ack).
- Sequence number, 1 byte.
- Payload 14 bytes.
If the receiving socket receive a wrong type of packets (ack instead of message, vica versa), the receiver thread will just drop it.
And in both cases why start another thread to receive the ACK instead of receiving it in the thread that did the send()? This makes even less sense.By 'receiving it in the thread that did the send()', do you mean that i should put it in the send() method block?
I pressume that an ack may come before the process finish sending the messages. I put it into a thread so that the process can receive ack while sending another messages.
It is not important though, because the number of packets that will be sent is relatively small. Should i just change it?
So, rethink. I would say that your always-listening socket should listen in a single thread for all messages, and notify sending threads about the acknowledgements some other way, e.g. via some data structure. You need that anyway to overcome the lack of ordering among ACKs. You need to associate each sent message that has an ACK outstanding with the thread that sent it, and when it arrives, notify that thread; have the sending thread wait(), almost certainly with a timeout, for that notification, and resend if necessary, adjusting the data structure appropriately so that a late ACK to the previous send is ignored. Or whatever is appropriate to your application protocol.I'll try to redesign my protocol. Thanks for the tips !
I'm not very good at English. Sorry if i misunderstood you in some way. -
A beginner in socket programming
Ok I am been stuck on this program for the whole day trying to figure out why I cannot connect to my server computer using sockets and threads.
I am trying to implement a instant messenger program where each user acts has both client/server. Each client creates a listening socket and all use a common port number, (in this case port 4444).
If client 1 wants to interact with client 2, client 1 query�s my MySQL database for their status. Now if their status is online, retrieve their current ip address. So far so good. My program does not with no problem.
Now comes the painful part. Now that client 1 knows client 2 is online and has his/hers ip, the next step is to connect to client 2�s listening socket using their ip and the port number 4444. Now after connecting to that socket, a new chat dialog gui is suppose to open from the client 2�s side. This new chat dialog gui (jframe) is a thread so that if other users wishes to interact with client 2, another new chat dialog thread will appear!
But in my case nope! Has soon as client 1 tries to establish a connection with client 2, boom. Error, connection refused: connect!!
Now I been searching through Google trying to understand what this means and so far I found null� now I posted before asking what that means and someone told me it means that I forgot to close the sockets and input, output streams. But how can I close it when I cannot even establish a connection with client 2??
Things I have tried:
I tried inputting myself, the actual ip of client 2 and guess what� no luck
I tried the client 2�s computer name, and same thing!
I tried to create a whole new main class just so that I can open and close the sockets and input/output stream and nope, no luck at all..
Now that you have a good understanding of my program. Here comes the code:
I�l start with the user_window, which is the main menu as you call it: this jframe once opened, is suppose to create a server socket to listen for connections. If a connection is made, load the chatdialog gui thread�
* user_window.java
* Created on 10 February 2006, 11:50
package icomm;
import java.sql.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.net.*;
import java.io.*;
* @author jonathan
public class user_window extends javax.swing.JFrame implements WindowListener {
protected String crnt_user;
protected String crnt_ip;
protected String dummy = "";
/** Creates new form user_window */
public user_window() {
initComponents();
listeningSocket();
addWindowListener( this );
public user_window(String users_name)
initComponents();
addWindowListener( this );
this.crnt_user = users_name;
private void exit()
MySQL_queries offline = new MySQL_queries();
offline.off_status(crnt_user);
JOptionPane.showMessageDialog(null, "you are about to close the program " + crnt_user, null, JOptionPane.ERROR_MESSAGE);
MySQL_queries query = new MySQL_queries();
query.off_status(crnt_user);
query.reset_ip(crnt_user);
System.exit(0);
public void windowClosing(WindowEvent e)
exit();
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
// <editor-fold defaultstate="collapsed" desc=" Generated Code ">
private void initComponents() {
try {
Buddie_list =(javax.swing.JTree)java.beans.Beans.instantiate(getClass().getClassLoader(), "icomm.user_window_Buddie_list");
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (java.io.IOException e) {
e.printStackTrace();
label = new javax.swing.JLabel();
demo = new javax.swing.JButton();
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
Close = new javax.swing.JMenuItem();
jMenu2 = new javax.swing.JMenu();
profile = new javax.swing.JMenuItem();
jMenu3 = new javax.swing.JMenu();
getContentPane().setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
getContentPane().add(Buddie_list, new org.netbeans.lib.awtextra.AbsoluteConstraints(10, 30, 230, 310));
getContentPane().add(label, new org.netbeans.lib.awtextra.AbsoluteConstraints(90, 390, -1, -1));
demo.setText("talk to shienna");
demo.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
demoActionPerformed(evt);
getContentPane().add(demo, new org.netbeans.lib.awtextra.AbsoluteConstraints(10, 360, -1, -1));
jMenu1.setText("File");
jMenu1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jMenu1ActionPerformed(evt);
Close.setLabel("Close");
Close.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
CloseActionPerformed(evt);
jMenu1.add(Close);
jMenuBar1.add(jMenu1);
jMenu2.setText("Option");
profile.setText("Edit Profile");
profile.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
profileActionPerformed(evt);
jMenu2.add(profile);
jMenuBar1.add(jMenu2);
jMenu3.setText("Help");
jMenuBar1.add(jMenu3);
setJMenuBar(jMenuBar1);
pack();
// </editor-fold>
private void demoActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
ChatDialog_c chatting = new ChatDialog_c(crnt_user, dummy);
chatting.setTitle("I-comm");
chatting.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
chatting.setSize(360, 500);
chatting.getSize();
chatting.setLocation(420,200);
chatting.setVisible(true);
private void CloseActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
private void demo1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
private void show_chat_window()
ChatDialog chat_gui = new ChatDialog();
chat_gui.setTitle("chat");
chat_gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
chat_gui.setSize(366, 480);
chat_gui.getSize();
chat_gui.setLocation(420,200);
chat_gui.setVisible(true);// TODO add your handling code here:
private void log_offActionPerformed(java.awt.event.ActionEvent evt) {
private void locate_ip()
try
InetAddress a;
a = InetAddress.getLocalHost(); //get ip addrees
this.crnt_ip = a.getHostAddress(); //then store it in this variable
catch(UnknownHostException e)
JOptionPane.showMessageDialog(null, "Error, cant detect localhost", null, JOptionPane.ERROR_MESSAGE);
public void windowActivated(WindowEvent e) {}
public void windowClosed(WindowEvent e) {}
public void windowDeactivated(WindowEvent e) {}
public void windowDeiconified(WindowEvent e) {}
public void windowIconified(WindowEvent e) {}
public void windowOpened(WindowEvent e)
locate_ip();
MySQL_queries new_ip = new MySQL_queries();
new_ip.update_ip(crnt_user, crnt_ip);
JOptionPane.showMessageDialog(null,"hello " + crnt_user + " your ip is" + crnt_ip, null, JOptionPane.ERROR_MESSAGE);
private void listeningSocket()
ServerSocket serverSocket = null;
boolean listening = true;
try
//listen in port 4444;
serverSocket = new ServerSocket(4444);
catch(IOException x)
JOptionPane.showMessageDialog(null, "cannot listen to port 4444", null, JOptionPane.ERROR_MESSAGE);
while(listening)
try
ChatDialog chat = new ChatDialog(serverSocket.accept());
catch(IOException x)
JOptionPane.showMessageDialog(null, "could not open chat window", null, JOptionPane.ERROR_MESSAGE);
private void jMenu1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
private void profileActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
* @param args the command line arguments
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new user_window().setVisible(true);
Now for the chatdialog class: I forgot to mention that I have two versions of this class. One that is a thread and the other makes a connection to a thread, hope that makes sence�
package icomm;
import java.net.*;
import java.io.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class ChatDialog_c extends javax.swing.JFrame implements WindowListener {
protected String messege;
private Socket socket = null;
protected String ip2;
private PrintWriter out = null;
private BufferedReader in = null;
private String user_name;
private String status;
/** Creates new form ChatDialog_c */
public ChatDialog_c()
initComponents();
addWindowListener( this );
public ChatDialog_c(String ip1)
initComponents();
addWindowListener( this );
this.ip2 = ip1;
//OptionPane.showMessageDialog(null, "error in closing sockdswdset " + ip2, null, JOptionPane.ERROR_MESSAGE);
public ChatDialog_c(String user, String status)
initComponents();
addWindowListener( this );
this.user_name = user;
public void windowClosing(WindowEvent e)
public void windowActivated(WindowEvent e) {}
public void windowClosed(WindowEvent e) {
try
in.close();
out.close();
socket.close();
catch(IOException x)
x.printStackTrace();
JOptionPane.showMessageDialog(null, "error in closing socket " + x.getMessage() + ip2, null, JOptionPane.ERROR_MESSAGE);
public void windowDeactivated(WindowEvent e) {}
public void windowDeiconified(WindowEvent e) {}
public void windowIconified(WindowEvent e) {}
public void windowOpened(WindowEvent e)
MySQL_queries get_ip = new MySQL_queries();
this.ip2 = get_ip.find_client(user_name);
JOptionPane.showMessageDialog(null, user_name + ip2, null, JOptionPane.ERROR_MESSAGE);
//create socket connection
try
socket = new Socket ("Shienna", 4444);
out = new PrintWriter(socket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
catch(UnknownHostException x)
x.printStackTrace();
JOptionPane.showMessageDialog(null, "unknown " + x.getMessage() + ip2, null, JOptionPane.ERROR_MESSAGE);
catch(IOException x)
x.printStackTrace();
JOptionPane.showMessageDialog(null, "2 " + x.getMessage(), null, JOptionPane.ERROR_MESSAGE);
try
in.close();
out.close();
socket.close();
catch(IOException x)
x.printStackTrace();
JOptionPane.showMessageDialog(null, "error in closing socket " + x.getMessage() + ip2, null, JOptionPane.ERROR_MESSAGE);
while(true)
try
String line = in.readLine();
convo_txt.append(line);
catch(IOException x)
x.printStackTrace();
JOptionPane.showMessageDialog(null, "3 " + x.getMessage(), null, JOptionPane.ERROR_MESSAGE);
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
// <editor-fold defaultstate="collapsed" desc=" Generated Code ">
private void initComponents() {
jScrollPane1 = new javax.swing.JScrollPane();
convo_txt = new javax.swing.JTextArea();
jScrollPane2 = new javax.swing.JScrollPane();
txt_messege = new javax.swing.JTextArea();
send = new javax.swing.JButton();
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
jMenu2 = new javax.swing.JMenu();
getContentPane().setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jScrollPane1.setViewportView(convo_txt);
getContentPane().add(jScrollPane1, new org.netbeans.lib.awtextra.AbsoluteConstraints(10, 20, 220, 280));
txt_messege.setLineWrap(true);
jScrollPane2.setViewportView(txt_messege);
getContentPane().add(jScrollPane2, new org.netbeans.lib.awtextra.AbsoluteConstraints(10, 330, 220, 70));
send.setText("Send");
send.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
sendActionPerformed(evt);
getContentPane().add(send, new org.netbeans.lib.awtextra.AbsoluteConstraints(10, 420, -1, -1));
jMenu1.setText("File");
jMenu1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jMenu1ActionPerformed(evt);
jMenuBar1.add(jMenu1);
jMenu2.setText("Option");
jMenuBar1.add(jMenu2);
setJMenuBar(jMenuBar1);
pack();
// </editor-fold>
private void sendActionPerformed(java.awt.event.ActionEvent evt) {
String text = txt_messege.getText();
out.println();
txt_messege.setText(new String(""));
convo_txt.append(text);
private void jMenu1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
* @param args the command line arguments
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new ChatDialog_c().setVisible(true);
}///////////////////////chat dialog thread/////////////////////
package icomm;
import java.net.*;
import java.io.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class ChatDialog extends javax.swing.JFrame implements WindowListener, Runnable {
protected String messege;
private Socket client_user = null;
/** Creates new form ChatDialog */
public ChatDialog()
initComponents();
addWindowListener( this );
public ChatDialog(String txt_messege)
initComponents();
addWindowListener( this );
this.messege = txt_messege;
public ChatDialog(Socket user)
initComponents();
addWindowListener( this );
this.client_user = user;
public void run()
BufferedReader in = null;
PrintWriter out = null;
String error = "error has occured ";
String messege = null;
try
//create input and output streams
in = new BufferedReader(new InputStreamReader (client_user.getInputStream()));
out = new PrintWriter(client_user.getOutputStream(), true);
while(true)
//read messege sent by user
messege = in.readLine();
//send data back to user
out.println(messege);
//append data on the text field
convo_txt.append(messege + "\n");
//chat_gui.setVisible(true);
//-=inputs = new ChatDialog(messege);
//out.close();
//in.close();
//client_user.close();
catch (IOException e)
//error messege
e.printStackTrace();
JOptionPane.showMessageDialog(null, error + e.getMessage(), null, JOptionPane.ERROR_MESSAGE);
}If I can sort this problem out I would of completed the main part of my program. I have spent days on this and hope that anyone of you guys can take the time out and help me with my current situation. Thanksupdate:
i have managed to sort out the connection refused
i know have anotehr problem: both client2 program freezes as soon as client 1 tries to initiate a connection to client 2!!!!!!!!
when client 2 logs into teh system. it freezes as soon as i press the button! but when client 1 attempts to conenct to client 2, client 2's program stops freezing and the chatdialog comes up showing nothing and freezes! my chadialog is suppose to show a file menu i made but it doesnt,. both clients freezes at this point. no error messeges occur... -
Problem displaying text in console after creating socket
Hi guys,
I'm trying to combine 2 invididual parts of a project I'm working on, but I am having problems intregating it all together.
I am using sockets to connect to 1 computer so it's using client server architecture. Whilst I am able to create and connect using the socket, my program is failing to print on the console. I would like to find out what I have done wrong, and get it working.
Server code:
import java.io.*;
import java.net.*;
import javax.swing.JOptionPane;
class Server
public static void main (String []args) throws IOException
try
Server();
catch (IOException ex)
public static void Server () throws IOException
ServerSocket serverSocket=null;
int portNo=4500;
System.out.println("Starting");
try
serverSocket=new ServerSocket(portNo);
catch (IOException ex)
System.err.println("Could not create socket on port" +portNo);
System.exit(1);
System.out.println("Socket listening");
Socket clientSocket=null;
try
clientSocket=serverSocket.accept();
catch (IOException ex)
System.out.println("Accept failed");
System.exit(1);
PrintWriter out= new PrintWriter(clientSocket.getOutputStream(), true);
BufferedReader in=new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
Board board1=new Board();
Protocol game=new Protocol();
boolean gameStart=true;
while (gameStart)
String originMove=JOptionPane.showInputDialog(null,"Origin Move","Enter in origin of piece",JOptionPane.QUESTION_MESSAGE);
byte [] originMoveByte=new byte[originMove.length()];
originMoveByte=originMove.getBytes();
System.out.println(originMoveByte);
out.close();
in.close();
clientSocket.close();
serverSocket.close();
class Board
boolean gameStart=true;
public static String [] [] Board()
String coordinates[] [] = new String [8] [8];
for (byte i=0;i<8;i++)
for (byte j=0;j<8;j++)
if ((i%2!=0)&&(j%2!=0))
coordinates[i] [j]="#";
else if ((i%2!=0)&&(j%2==0))
coordinates[i] [j]=" ";
else if ((i%2==0)&&(j%2!=0))
coordinates[i] [j]=" ";
else
coordinates[i] [j]="#";
coordinates[0][0]="R";
coordinates[0][1]="N";
coordinates[0][2]="B";
coordinates[0][3]="Q";
coordinates[0][4]="K";
coordinates[0][5]="B";
coordinates[0][6]="N";
coordinates[0][7]="R";
for (int i=0;i<8;i++)
coordinates[1]="P";
coordinates[7][0]="r";
coordinates[7][1]="n";
coordinates[7][2]="b";
coordinates[7][3]="q";
coordinates[7][4]="k";
coordinates[7][5]="b";
coordinates[7][6]="n";
coordinates[7][7]="r";
for (int i=0;i<8;i++)
coordinates[6][i]="p";
printBoard(coordinates);
return coordinates;
public static void update (String coordinates [] [])
printBoard(coordinates);
public static void printBoard(String coordinates[] [])
for (int i=0;i<8;i++)
for (int j=0;j<8;j++)
System.out.print(coordinates[i][j]);
System.out.println();
}Cheers,
BenSorry guys, I got a follow up problem :(
U:\Server\Server.java:126: incompatible types
found : java.lang.String[][]
required: java.io.PrintWriter
out=game.Protocol(coordinates,originMove,destinationMove);
^
1 error
Process completed.What needs changing? Btw, coordinates is the 2D String array
Cheers,
Ben -
Send html page (with images) using sockets
I am trying to implement http and am coding this using sockets. So it is a simple client-server set up where the browser queries my server for a webpage and it should be shown. The html itself is fine, but I can't get any of the images to show up! All of my messages give me a status "200 OK" for the images, so I cant understand what my problem is!
Also, is the status and header lines supposed to be shown in the browser? I didnt think so but it keeps showing up when I query a webpage.
Please help!
import java.io.* ;
import java.net.* ;
import java.util.* ;
public final class WebServer
public static void main(String argv[]) throws Exception
// Set the port number.
int port = 8888;
// Establish the listen socket.
ServerSocket ssocket = new ServerSocket(port);
// Establish client socket
Socket csocket = null;
// Process HTTP service requests in an infinite loop.
while (true)
// Listen for a TCP connection request.
// (note: this blocks until connection is made)
csocket = ssocket.accept();
// Construct an object to process the HTTP request message.
HttpRequest request = new HttpRequest(csocket);
// Create a new thread to process the request.
Thread thread = new Thread(request);
// Start the thread.
thread.start();
final class HttpRequest implements Runnable
final static String CRLF = "\r\n";
Socket socket;
// Constructor
public HttpRequest(Socket socket) throws Exception
this.socket = socket;
// Implement the run() method of the Runnable interface.
public void run()
try
processRequest();
catch (Exception e)
System.out.println(e);
private static void sendBytes(FileInputStream fis, OutputStream os)
throws Exception
// Construct a 1K buffer to hold bytes on their way to the socket.
byte[] buffer = new byte[1024];
int bytes = 0;
// Copy requested file into the socket's output stream.
while((bytes = fis.read(buffer)) != -1 ) {
os.write(buffer, 0, bytes);
os.flush();
private static String contentType(String fileName)
fileName = fileName.toLowerCase();
if(fileName.endsWith(".htm") || fileName.endsWith(".html")) {
return "text/html";
if(fileName.endsWith(".jpg") || fileName.endsWith(".jpeg") ) {
return "image/jpeg";
if(fileName.endsWith(".gif")) {
return "image/gif";
return "application/octet-stream";
private void processRequest() throws Exception
// Get a reference to the socket's input and output streams.
InputStream is = socket.getInputStream();
DataOutputStream os = new DataOutputStream(socket.getOutputStream());
// Set up input stream filters.
InputStreamReader ir = new InputStreamReader(is);
BufferedReader br = new BufferedReader(ir);
// Get the request line of the HTTP request message.
String requestLine = br.readLine();
// Display the request line.
System.out.println();
System.out.println(requestLine);
// Get and display the header lines.
String headerLine = null;
while ((headerLine = br.readLine()).length() != 0)
System.out.println(headerLine);
// Extract the filename from the request line.
StringTokenizer tokens = new StringTokenizer(requestLine);
tokens.nextToken(); // skip over the method, which should be "GET"
String fileName = tokens.nextToken();
// Prepend a "." so that file request is within the current directory.
fileName = "C:\\CSM\\Networking\\Project1" + fileName;
// Open the requested file.
FileInputStream fis = null;
boolean fileExists = true;
try {
fis = new FileInputStream(fileName);
} catch (FileNotFoundException e) {
fileExists = false;
// Construct the response message.
String statusLine = null;
String contentTypeLine = null;
String entityBody = null;
if (fileExists) {
statusLine = "200 OK" + CRLF;
contentTypeLine = "Content-type: " +
contentType( fileName ) + CRLF
+ "Content-length: " + fis.available() + CRLF;
else {
statusLine = "404 Not Found" + CRLF;
contentTypeLine = "Content-type: text/html" + CRLF;
entityBody = "<HTML>" +
"<HEAD><TITLE>Not Found</TITLE></HEAD>" +
"<BODY>Not Found</BODY></HTML>";
// Send the status line.
os.writeBytes(statusLine);
System.out.println(statusLine);
// Send the content type line.
os.writeBytes(contentTypeLine);
System.out.println(contentTypeLine);
// Send a blank line to indicate the end of the header lines.
os.writeBytes(CRLF);
// Send the entity body.
if (fileExists)
sendBytes(fis, os);
fis.close();
// file does not exist
else
os.writeBytes(entityBody);
// Close streams and socket.
os.flush();
os.close();
br.close();
socket.close();
}ok. i figured it out. STUPID mistake. i forgot to include "HTTP/1.1" in my status line!!!
-
Socket Programing in J2ME - Confused with Sun Sample Code
Hai Everybody,
I have confused with sample code provided by Sun Inc , for the demo of socket programming in J2ME. I found the code in the API specification of J2ME. The code look like :-
// Create the server listening socket for port 1234
ServerSocketConnection scn =(ServerSocketConnection) Connector.open("socket://:1234");
where Connector.open() method return an interface Connection which is the base interface of ServerSocketConnection. I have confused with this line , is it is possible to cast base class object to the derived class object?
Plese help me in this regards
Thanks in advance
SulfikkarThere is nothing to be confused about. The Connector factory creates an implementation of one of the extentions of the Connection interface and returns it.
For a serversocket "socket://<port>" it will return an implementation of the ServerSocketConnection interface. You don't need to know what the implementation looks like. You'll only need to cast the Connection to a ServerSocketConnection . -
Simple Webserver SocketException: socket write error
I'm stuck and need some help solving this problem.
When I try to get the 404 message with the webserver, I get this in the output console:
"HttpRequest - java.net.SocketException: Connection reset by peer: socket write error"
I have found the part that makes the problem, but I can't find a solution.
I hope someone can help me with this!
try
outputStream.writeBytes(entityBody);
import java.io.*;
import java.net.*;
import java.util.*;
public final class WebServer
public static void main(String[] args) throws Exception
//Port number
int port = 8080;
// Establish the listen socket.
ServerSocket webSocket = new ServerSocket(port);
// Process HTTP service requests in an infinite loop.
while(true)
// Listen for a TCP connection request
Socket tcpSocket = webSocket.accept();
HttpRequest httpRequest = new HttpRequest(tcpSocket);
Thread thread = new Thread(httpRequest);
thread.start();
import java.io.*;
import java.net.*;
import java.util.*;
public class HttpRequest implements Runnable
final static String CRLF = "\r\n";
private Socket socket;
private String path = "public_html/";
public HttpRequest(Socket socket)
this.socket = socket;
public void run()
try
processReguest();
catch(Exception ex)
System.err.println(ex);
private void processReguest() throws Exception
// Get a reference to the socket's input and output streams.
InputStreamReader inputReader = new InputStreamReader(socket.getInputStream());
DataOutputStream outputStream = new DataOutputStream(socket.getOutputStream());
BufferedReader buffReader = new BufferedReader(inputReader);
String requestLine = buffReader.readLine();
System.out.println();
System.out.println(requestLine);
String headerLine = null;
while((headerLine = buffReader.readLine()).length() != 0)
System.out.println(headerLine);
// Extract the filename from the request line
StringTokenizer tokens = new StringTokenizer(requestLine);
tokens.nextToken();
String fileName = tokens.nextToken();
//Prepend a "." so that the file request is within the current directory
fileName = path + "." + fileName;
//Open the request file
FileInputStream fileInputStream = null;
boolean fileExists = true;
try
fileInputStream = new FileInputStream(fileName);
catch(FileNotFoundException ex)
fileExists = false;
//Construct the response message.
String statusLine = null;
String connection = null;
String contentLength = null;
String contentTypeLine = null;
String entityBody = null;
String contentType = contentType(fileName);
if(!requestLine.startsWith("GET") && !requestLine.startsWith("HEAD"))
statusLine = "HTTP/1.0 405 Method Not Allowed" + CRLF;
contentLength = "Content-Length: 0" + CRLF;
connection = "Connection: close" + CRLF;
contentTypeLine = "Content-type: " + "text/html" + CRLF;
entityBody = "<HTML><HEAD><TITLE>405 - Method Not Allowed</TITLE></HEAD><BODY>405 - Method Not Allowed</BODY></HTML>";
fileInputStream = null;
fileExists = false;
else if(fileExists && !contentType.equals("application/octet-stream"))
statusLine = "HTTP/1.0 200 OK" + CRLF;
contentTypeLine = "Content-type: " + contentType(fileName) + CRLF;
connection = "Connection: close" + CRLF;
contentLength = "Content-Length: " + Integer.toString(fileInputStream.available()) + CRLF;
else if(fileExists && contentType.equals("application/octet-stream"))
statusLine = "HTTP/1.0 415 Unsupported Media Type" + CRLF;
contentLength = "Content-Length: 0" + CRLF;
connection = "Connection: close" + CRLF;
contentTypeLine = "Content-type: " + "text/html" + CRLF;
entityBody = "<HTML><HEAD><TITLE>415 - Unsupported Media Type</TITLE></HEAD><BODY>415 - Unsupported Media Type</BODY></HTML>";
fileInputStream = null;
fileExists = false;
else
statusLine = "HTTP/1.0 404 Bad Request" + CRLF;
contentLength = "Content-Length: 0" + CRLF;
connection = "Connection: close" + CRLF;
contentTypeLine = "Content-type: " + "text/html" + CRLF;
entityBody = "<HTML><HEAD><TITLE>404 - Not Found</TITLE></HEAD><BODY>404 - Not Found</BODY></HTML>";
// Send the status line
outputStream.writeBytes(statusLine);
// Send the connection status
outputStream.writeBytes(connection);
// Send the Content-Length
outputStream.writeBytes(contentLength);
// Send the content type line
outputStream.writeBytes(contentTypeLine);
//Send a blank line to indicate the end of the header lines.
outputStream.writeBytes(CRLF);
// Send the enity body
if(fileExists)
//Den här funkar??
sendBytes(fileInputStream, outputStream);
fileInputStream.close();
else
try
outputStream.writeBytes(entityBody);
catch(SocketException ex)
System.out.println(ex);
socket.close();
inputReader.close();
outputStream.close();
buffReader.close();
private void sendBytes(FileInputStream fileInputStream, DataOutputStream outputStream) throws IOException
//Construct a 1k buffer to hold bytes on their way to the socket
byte[] buffer = new byte[1024];
int bytes = 0;
// Copy request file inte socket's output stream
while((bytes = fileInputStream.read(buffer)) != -1)
outputStream.write(buffer,0, bytes);
private String contentType(String fileName)
if(fileName.endsWith(".htm") || fileName.endsWith(".html"))
return "text/html";
else if(fileName.endsWith(".jpg") || fileName.endsWith(".jpeg"))
return "image/jpeg";
else if(fileName.endsWith(".gif"))
return "image/gif";
else if(fileName.endsWith(".png"))
return "image/png";
else if(fileName.endsWith(".txt"))
return "text/plain";
return "application/octet-stream";
}You've told the client that the content length is zero bytes so I presume it closes the connection as soon as it finishes receiving headers. It depends what client you're using of course but that seems reasonable behaviour...
-
Re: is it possible to program with Sockets with the Internet as a network.
I am working with socket programming.
During the Christams holidays I will need to do some programming at home.
Is it possible to program with sockets on a home PC using Windows with only the Internet as a network?yes it is
I am also working on an application that uses sockets at the moment, and I asked help a lot by these days ;)
Maybe I can help you from what I've learned..
here is a basic:
create server socket:
ServerSocket server = new ServerSocket(4444);
4444 is the port on which the socket is listening
Socket socket = new Socket("127.0.0.1",4444);
127.0.0.1 is a local IP adress to connect to and 4444 is the port number to connect to. That considers that the server and the connecting client are both on the same PC, but then you can use other IPs ;)
Hope it helps -
Implementing sockets and threads in a jframe gui program
Hi, I am trying to find a solution to a problem I am having designing my instant messenger application.
I am creating listening sockets and threads for each client logged into the system. i want to know if there is a way to listen to other clients request from the main gui and then if another client tries to establish a connection with me for example, a thread is created for that client and then my chat gui opens automatically has soon has the other client sends his or hers first text message to me.
I am relatively new at socket programming has I am currently studying along this area. I know how to create threads and sockets but I am having trouble finding out a solution to my problem. Here is the code that I have done so far for the listening method from my main gui, and the thread class of what I have done so far.
listening socket:
private void listeningSocket()
ServerSocket serverSocket = null;
boolean listening = true;
try
//listen in port 4444;
serverSocket = new ServerSocket(4444);
catch(IOException x)
JOptionPane.showMessageDialog(null, "cannot listen to port 4444", null, JOptionPane.ERROR_MESSAGE);
while(listening)
client_thread w;
try
w = new client_thread(serverSocket.accept(), jTextArea1);
Thread t = new Thread(w);
t.start();
catch(IOException x)
JOptionPane.showMessageDialog(null, "error, cannot start new thread", null, JOptionPane.ERROR_MESSAGE);
}thread class:
import java.io.*;
import java.net.*;
import javax.swing.*;
import java.sql.*;
import java.awt.event.*;
* @author jonathan
public class client_thread extends Thread
//define new socket object
private Socket client_user = null;
private JTextArea textArea;
public client_thread(Socket client_user, JTextArea textArea)
this.client_user = client_user;
this.textArea = textArea;
public void run()
BufferedReader in = null;
PrintWriter out = null;
String error = "error has occured, messege was not sent";
String messege = null;
try
//create input and output streams
in = new BufferedReader(new InputStreamReader (client_user.getInputStream()));
out = new PrintWriter(client_user.getOutputStream(), true);
while(true)
//read messege sent by user
messege = in.readLine();
//display messege in textfield
out.println(messege);
textArea.append(messege);
catch (IOException e)
//error messege
JOptionPane.showMessageDialog(null, error, null, JOptionPane.ERROR_MESSAGE);
}Seems like all you need to do is create a new dialog for each socket that is established. Your current design looks like it will attempt to use the same textarea for all the sockets.
I would say in your thread class do the following:
MyConversationDialog dialog = new MyConversationDialog();
while(true)
//read messege sent by user
messege = in.readLine();
//display messege in textfield
out.println(messege);
dialog.setVisible (true);
dialog.addMessage (message);
} -
How to stop B2B listener polling when SOA server in Admin Mode
Hi ,
I recently came across this situation like my B2B FTP listener is polling and deleting file when my SOA server is Admin Mode.
Can anyone help me to stop that polling when server is in Admin Mode ?
Thanks,
Sabathanks for quick reply...
the "catch (IOException e) {... } " block in Server already catches this exception, and as there is no other code but printing the exception, the method run() is quitted (no need to terminate the loop). However, the thread is NOT terminated even after that. To make it sure, I added a public variable and accessed it from Handler at the end of the code, after sd.resetSock(); !!!
You told that it doesn't stop because of the way I coded it, isn't it the traditional way of setting a listener socket? If no, may be recoding the listener would be much better...
Maybe you are looking for
-
The drive had been working on my mbp until recently. Now, it does not even show up in disk utility. The problem began when I changed the drive to GPT with Paragon's Partition Manager. After this problemn occurred, I used Paragon Partition Manager
-
<b>Dear All, I am learning SRM.SRM 5.0 Ides has been installed in my system. I try to login through browser link. As per the below step I got the browser link.</b> Go to transaction SICF Search Service Name BBPSTART Right click the BBPSTART and Te
-
No matter what i try i cannot get Photoshop or Bridge to open Camera Raw Filters, how do i fix this?
no matter what i try i cannot get Photoshop or Bridge to open Camera Raw Filters, how do i fix this? I have windows 8 and ive tried everything i can to open it but it refuses to let me.
-
No action instance for path /userRegistration could be created ?
Hi All, I am getting the following error: No action instance for path /userRegistration could be created stack trace is as: va:268) at org.apache.struts.action.ActionServlet.process(ActionServlet.java: 2) at org.apache.struts.action.A
-
Recovering using backup controlfile
Hello, When we do database recovery (not until some time in the past, but until "now") using binary backup of controlfile why do we need to open it with resetlogs? The scenario is: we have all the datafiles, archived redo and online redo logs, but al