Re: Client blocks!

Hi,

The basic problem is that you are trying to read a line of text from
both the server and client at the same time without sending a line
first. I.e server starts by waiting for a line of text and the client
also starts by waiting for a line of text, hence it hangs...

I modified the programs slighly so that the client starts by sending a
line of text until the user enters a null or empty line, in which case
the client closes the stream and socket. In this case the server will
also close down, in a real application you probably want to start a new
worker thread for each acceted client connection....

Regards,
Martin Lansler

import java.io.*;
import java.net.*;

public class Client {

    public static void main(String[] args) {
        Socket socket = null;
        PrintWriter out = null;
        BufferedReader in = null;
        BufferedReader user = null;
        try {
            String fromServer, fromUser;

            // Connect to server.
            socket = new Socket("localhost", 4444);

            // Out channel.
            out = new PrintWriter(socket.getOutputStream());

            // In channel.
            in = new BufferedReader(new
InputStreamReader(socket.getInputStream()));

            // Input from user.
            user = new BufferedReader(new
InputStreamReader(System.in));

            while (out != null) {
                fromUser = user.readLine();

                if (fromUser != null && !"".equals(fromUser)) {
                    out.println(fromUser);
                    out.flush();
                    fromServer = in.readLine();
                    System.out.println(fromServer);
                } else {
                    out.close();
                    out = null;
                    socket.close();
                }
            }

        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }
}

import java.io.*;
import java.net.*;

public class Server {

    public static void main(String[] args) {

        ServerSocket serverSocket = null;
        Socket ss = null;
        BufferedReader in = null;
        PrintWriter out = null;

        try {
            serverSocket = new ServerSocket(4444);

            System.out.println("CRAP1");
            ss = serverSocket.accept();
            System.out.println("CRAP2");
            //
            in = new BufferedReader(new
InputStreamReader(ss.getInputStream()));
            out = new PrintWriter(ss.getOutputStream());

            String bob = null;

            while ((bob = in.readLine()) != null) {
                System.out.println("CRAP3");
                out.println(bob + " from server");
                out.flush();
                System.out.println(bob);
            }
            serverSocket.close();
        }

        catch (IOException e) {
            e.printStackTrace();
        }
    }

}

eksamor@yahoo.com wrote: