MultiJabberServer.java

package com.e2u.net;
//: c15:MultiJabberServer.java
// A server that uses multithreading
// to handle any number of clients.
import java.io.*;
import java.net.*;

class ServeOneJabber extends Thread
{
	private Socket socket;
	private BufferedReader in;
	private PrintWriter out;

	public ServeOneJabber(Socket s) throws IOException
	{
		socket = s;
		in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
		// Enable auto-flush:
		out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket
			.getOutputStream())), true);
		// If any of the above calls throw an
		// exception, the caller is responsible for
		// closing the socket. Otherwise the thread
		// will close it.
		start(); // Calls run()
	}

	public void run()
	{
		try
		{
			while(true)
			{
				String str = in.readLine();
				if(str.equals("END"))
					break;
				System.out.println("Echoing: " + str);
				out.println(str);
			}
			System.out.println("closing...");
		}
		catch(IOException e)
		{
			System.err.println("IO Exception");
		}
		finally
		{
			try
			{
				socket.close();
			}
			catch(IOException e)
			{
				System.err.println("Socket not closed");
			}
		}
	}
}

public class MultiJabberServer
{
	static final int PORT = 40023;

	public static void main(String[] args) throws IOException
	{
		ServerSocket s = new ServerSocket(PORT);
		System.out.println("Server Started");
		try
		{
			while(true)
			{
				// Blocks until a connection occurs:
				Socket socket = s.accept();
				try
				{
					new ServeOneJabber(socket);
				}
				catch(IOException e)
				{
					// If it fails, close the socket,
					// otherwise the thread will close it:
					socket.close();
				}
			}
		}
		finally
		{
			s.close();
		}
	}
} // /:~