Server socket programming and thread

Question

hello,
briefly this is what i have sought out to do : the server waits for the client indefinitely,upon a client requesting for service by writing a service id into the socket, a new thread of the type id as read by the server which is a sub-class of the Server (main-class) is exec'd.
the problem as i understand is that the client can send as much of data as it desires to the server and the thread can read the data it receives by the clients.the server(thread) fails to write reply to the client;eventhough out.write() is successful;the client is blocked in read() indefinitely.is it because of the thread which runs at a different port the client does not know and the server is not redirecting response to the client.
how do i read what the server(thread) writes onto the socket from the clients.

Answer 1

thanks again,just check out this code please
public class Server extends Thread //create a multi-threaded server
    /* *Creates a new instance of Server  */
    String                           serverAddr=CodeServer.ServerRun.SERVER_IP_ADDR;
    int                              serverPortNum=CodeServer.ServerRun.SERVER_TCP_PORT;   
    ServerSocket                     sSock;
    Socket                           cSocket;
    int                              requestID=0;
    boolean                          debug=true;  
    InputStream                      in =null;
    OutputStream                     out=null;
    Server ()
    Server (Socket csocket)
        this.cSocket = csocket;
    /* start the server at specifed portNum */
    private void initialise ()
        try
            //start the server at serverPortNum
            sSock=new ServerSocket (serverPortNum);
        catch (IOException ex)
            ex.printStackTrace ();
        /* console output of status of server */
        if(debug==true)
            System.out.println ("Server waiting @ "+sSock);
    private void acceptRequest ()
        try
            this.cSocket=sSock.accept ();
            if(debug==true)
                System.out.println ("client socket @ "+cSocket);
        catch (IOException ex)
            ex.printStackTrace ();
    private void readRequestID ()
        /*step 1: determine the type of server before threading
         *a request the the type of server got by the request ID
         * number */       
        try
            in        =cSocket.getInputStream ();
            requestID =in.read ();
            out       =cSocket.getOutputStream ();
            if(debug==true)
                System.out.println ("accross the client:"+requestID);
        catch (IOException ex)
            ex.printStackTrace ();
    private void execThreadForRequest ()
        /*step 2: after requestID is received on the socket.
         *its time to decide the server to thread the control into.
        switch(requestID)
            case 1: //invoke the RegisterServer thread
                new CodeServer.Core.RegistrationServer (this.cSocket).start ();
                break;
            case 2: //invoke the ListingServer thread
                break;
            case 3: //invoke the MessageTransferServer thread
                break;
            case 4: //invoke the CallSetupServer thread
                break;
            case 5: //invoke the DisconnectServer thread
                break;
            case 6: //invoke the ChangeUserStatusServer thread
                break;
    public void run ()
        // client processing code here==super class does nothing here
    public static void main (String args[]) throws Exception
        Server s=new Server ();
        s.initialise ();
        /* start indefinitely the main server thread */
        while (true)
           /* accept() blocks the server for a request
              a new request is put into a thread for processing */
            s.acceptRequest (); //initialise the clientSocket
            s.readRequestID (); //get the actual requested service
            s.execThreadForRequest (); //start the actual server thread
/**registration service class;
*registers the IP address of the caller,callee and the status
*adds the caller to the hash table and updates status
class RegistrationServer extends Server
    Socket              cSocket;
    InetAddress         clientAddr;
    DataInputStream     inStream;
    DataOutputStream    outStream;
    //Socket s=new Socket()
    RegistrationServer (Socket cSocket)
        this.cSocket=cSocket;
        clientAddr =cSocket.getInetAddress ();
        try
            //init for reading status and custom message.
            inStream     =new DataInputStream (cSocket.getInputStream ());
            outStream    =new DataOutputStream (cSocket.getOutputStream ());
        catch (IOException ex)
            ex.printStackTrace ();
        if(CodeServer.ROO.DEBUG==true)
            System.out.println ("register server:"+cSocket
                               +" host ip:"+clientAddr.getHostName ());
    public void run ()
        int    status=0;
        String custMesg=null;
        try
            /* read the custom message */
            if(inStream.available ()>0)
                try
                    custMesg=inStream.readUTF ();
                    System.out.println (""+custMesg);
                catch(EOFException e)
                    e.printStackTrace ();
            else
                custMesg="";
        catch (IOException ex)
            ex.printStackTrace ();
            try
                       here is the problem, i found if i try reading accross the client             
                       i only receive a junk value 81 always */
                   outStream.write(1); //write success
                    outStream.flush();
            catch (IOException ex)
                ex.printStackTrace ();
}and with the client GUI :thanks for the help.please do find time to help me out with a suggestion or two on this code.