My simple chat server does not send messages to connected clients

Question

Hi!
I´m developing a chat server. But I can not get it work. My client seems to make a connection to it, but my server does not send the welcome message it is supposed to send when a client connects. Why not?
removedEdited by: Roxxor on Nov 24, 2008 10:36 AM

Answer 1

Ok, I solved my previous problem and now I have got a new really annoying one.
This is a broadcasting server which meand it can handle multiple clients and when one client sends a message to the server, the server should broadcast the message to all connected clients. It almost works, except that the server just sends the message back to the last connected client. The last connected client seems to steal the PrintStream() from the other clients. How can I solve that?
import java.io.*;
import javax.microedition.io.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.lang.Character;
import java.io.OutputStream;
import java.util.Vector;
public class ChatServer extends MIDlet implements CommandListener, Runnable
     private Display disp;
     private Vector connection = new Vector();          
     private TextField tf_port = new TextField("Port: ", "", 32, 2);               
     private Form textForm = new Form("Messages");
     private Form start_serverForm = new Form("Start server", new Item[] {  tf_port });
     private Command mExit = new Command("Exit", Command.EXIT, 0);
     private Command mStart = new Command("Start", Command.SCREEN, 0);
     private Command mDisconnect = new Command("Halt server", Command.EXIT, 0);
     ServerSocketConnection ssc;
     SocketConnection sc;
     PrintStream out;
     public ChatServer()
          start_serverForm.addCommand(mExit);
          start_serverForm.addCommand(mStart);
          start_serverForm.setCommandListener(this);
          tf_port.setMaxSize(5);
          textForm.addCommand(mDisconnect);
          textForm.setCommandListener(this);
     public void startApp()
          disp = Display.getDisplay(this);
          disp.setCurrent(start_serverForm);
     public void pauseApp()
     public void destroyApp(boolean unconditional)
     public void commandAction(Command c, Displayable s)
          if(c == mExit)
               destroyApp(false);
               notifyDestroyed();
          else if(c == mStart)
               Thread tr = new Thread(this);
               tr.start();
          else if(c == mDisconnect)
               try
                    sc.close();                              
               catch(IOException err) { System.out.println("IOException error: " + err.getMessage()); }
               destroyApp(false);
               notifyDestroyed();
     public void run()
          try
               disp.setCurrent(textForm);
               ssc = (ServerSocketConnection)Connector.open("socket://:2000");
               while(true)               
                    sc = (SocketConnection) ssc.acceptAndOpen();     
                    connection.addElement(sc);                                                  
                    out = new PrintStream(sc.openOutputStream());
                    textForm.append(sc.getAddress() + " has connected\n");
                    ServerToClient stc = new ServerToClient(sc);
                    stc.start();
          catch(IOException err) { System.out.println("IOException error: " + err.getMessage()); }
          catch(NullPointerException err) { System.out.println("NullPointerException error: " + err.getMessage()); }
     class ServerToClient extends Thread
          String message;
          InputStream in;
          SocketConnection sc;
          ServerToClient(SocketConnection sc)
               this.sc = sc;
          public void run()
               try
                    in = sc.openInputStream();
                    int ch;
                    while((ch = in.read())!= -1)                         
                         System.out.print((char)ch);
                         char cha = (char)ch;                              
                         String str = String.valueOf(cha);                    
                         out.print(str);
                         //broadcast(str);
                         textForm.append(str);                              
                    in.close();
                    //out.close();
                       sc.close();
               catch(IOException err) { System.out.println("IOException error: " + err.getMessage()); }
}