Got a problem with my Chatting-Room program, please help me if you can.

Question

There is one bug in the code (should be just one), but I couldn't find it, I even recoded the whole thing, after I recoded the code, the same problem seems still there. I just can't find where the problem is. So I hope someone here can help me, thank you very much.
First, I made a Server and a Client. Server has 5 classes, and Client has 2 classes. My intention is that all the clients(running on other computers) will connect to the server (which is my laptop), and then they can communicate with each other. For example, if person A typed "Hello", person B and person C's computers will receive this message and display it.
The problem is that several clients can connect to the server (My laptop), but if one person type something, other people won't receive the message, it's blank on their screens. Maybe there is a problem when server receiving the message. So this is the problem I want to solve.
I have the code down there, here is a brife description what each class mainly does.
First class of Server is for connecting client, this class is named Server. Everytime a client is connected, the Server class calls the second class to store the client's information (which is its IP address), the second class is named People.
Third class is named Receiver, it is for receiving the massage from any one of the clients, then stores the message to a static field variable in Fourth class, fourth class is named Saying.
Fifth class of Server is named Sender, it is for sending the massage to the client, that message is the one that stored in Saying.
The First class of client is named Client, it prints any message that the server send to it.
The Second class of client is named SendFromClient, it wait for user to type something, and then send the message to the server, so server's Receiver class hopefully will get it and store it to the field variable in the Saying class.
Here is all the codes:
Server Class:
import java.net.*;
import java.io.*;
import java.util.*;
public class Server
     public static void main(String[] args)
          /*port number*/
          final int port = 41333;
          /*welcome messages:*/
          System.out.println("This is FriendlyJ 1.0 running");
          System.out.println("Listening on ports 41333");
          try
               /*Clear the ArrayList*/
               People clear = new People();
               clear.IPs.clear();
               /*Create a server socket that will accept any connection on this port*/
               ServerSocket ss = new ServerSocket(port);
               /*keep getting clients*/
               while(true)
                    /*connect with one client at a time*/
                    Socket s = ss.accept();
                    PrintWriter out = new PrintWriter(s.getOutputStream(),true);
                    Scanner in = new Scanner(s.getInputStream());
                    /*indicate one establish of connection*/
                    System.out.println("One connection estabolished!");
                    /*two classes, one foe receiving, one for sending*/
                    Receiver receive = new Receiver(in);
                    Thread ty = new Thread(receive);
                    Sender send = new Sender(out, s);
                    Thread yt = new Thread(send);
                    ty.start();
                    yt.start();
                    /*add IP to ArrayList*/
                    clear.storing(s.getInetAddress().toString());
                    out.println("There are " + clear.IPs.size() + " people online;");
                    System.out.println("Connected to " + s.getInetAddress().toString());
          catch (Exception e)
               System.out.println("System exception");
}People Class:
import java.util.*;
public class People
     ArrayList<String> IPs = new ArrayList<String>();
     /*A method for storing IPs*/
     public void storing(String IP)
          IPs.add(IP);
}Receiver Class:
import java.util.*;
public class Receiver implements Runnable
     final private Scanner in;
     /*Constructor to get the scanner*/
     public Receiver(Scanner abc)
          in = abc;
     public void run()
          Saying say = new Saying();
          try
               while(true)
                    /*waiting for input from client, then give it to Saying*/
                    say.setSaying(in.nextLine());
          catch (Exception e)
               e.printStackTrace();
}Saying Class:
public class Saying
     static String saying = "";
     public void setSaying(String a)
          saying = a;
     public String getSaying()
          return saying;
     public void resetSaying()
          saying = "";
     public int getlength()
          return saying.length();
}Sender Class:
import java.io.*;
import java.net.*;
public class Sender implements Runnable
     final private PrintWriter out;
     final private Socket s;
     public Sender(PrintWriter abcd, Socket abcde)
          out = abcd;
          s = abcde;
     public void run()
          out.println("Feel free to chat.");
          int count;
          Saying says = new Saying();
          try
          while(!s.isClosed())
               count = says.getlength();
               if(count>0)
                    out.println(says.getSaying());
                    says.resetSaying();
          /*disconnect with the client*/
          s.close();
          System.out.println("Connection with " + s.getInetAddress().toString() + " is closed.");
          catch (IOException e)
               System.out.println("Network error!");
}Client Class:
import java.util.*;
import java.net.*;
import java.io.*;
public class Client
     public static void main(String[] args)
          Socket sc;
          System.out.println("Welcome to FriendlyJ IM program");
          System.out.println("Connecting to the server...");
          int port = 41333;
          /*A variable for storing IP address of Server*/
          InetAddress ip;
          try
               ip = InetAddress.getByName("192.168.1.68");
               sc = new Socket(ip, port);
               System.out.println("Connected with Server");
               Scanner in = new Scanner(sc.getInputStream());
               PrintWriter out = new PrintWriter(sc.getOutputStream());
               /*a thread for sending message to the server*/
               sendFromClient sendin = new sendFromClient(out);
               Thread sending = new Thread(sendin);
               sending.start();
               /*display welcome message*/
               System.out.println(in.nextLine());
               /*displaying how many people are online now*/
               System.out.println(in.nextLine());
               while(true)
                    /*print out the message sent by the server*/
                    System.out.println(in.nextLine());
          catch(UnknownHostException e)
               System.out.println("Couldn't find the host!");
          catch(IOException e)
               System.out.println("Network error!");
          catch (Exception e)
               e.printStackTrace();
}SendFromClient Class:
import java.io.*;
import java.util.*;
public class sendFromClient implements Runnable
     private PrintWriter send;
     public sendFromClient(PrintWriter sendto)
          send = sendto;
     public void run()
          Scanner sc = new Scanner(System.in);
          while(true)
               /*get a message, then send to the server*/
               send.println(sc.nextLine());
That's all, thank you for helping!
Edited by: stdioJ on Oct 31, 2007 3:58 PM

Answer 1

Hi pgeuens ,
I tried it ...but it didn't work for me.
I changed my .jsp like this
<%@ page language="java" %>
<%@ taglib uri="/tags/struts-html" prefix="html"%>
<html:form action="Registration.do">
UserName:<html:text property="username"/><br>
enter password:<htnl:password property="password1"/><br>
re-enter password:<html:password property="password2"/><br>
<html:submit value="Register"/>
</html:form>And i changed that web.xml like..
<taglib>
    <taglib-uri>/tags/struts-html</taglib-uri>
    <taglib-location>/WEB-INF/struts-html.tld</taglib-location>
  </taglib>Now I am getting an error like ......."File "/WEB-INF/struts-html.tld"not found.
Hi Ashish
I didn't find struts-form.tld in WEB-INF folder.But all the remaining file all there.
Again I downloaded that struts1.2.9 ...in that also i couldn't find struts-form.tld file(except this remaining are there).
Please tell me, if there any other ways....
Thanks,
kona.