Mega Code Archive
Implements a multithreaded server that listens to port 8189 and echoes back all client input
<![CDATA[
/*
This program is a part of the companion code for Core Java 8th ed.
(http://horstmann.com/corejava)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;
/**
This program implements a multithreaded server that listens to port 8189 and echoes back
all client input.
@author Cay Horstmann
@version 1.20 2004-08-03
*/
public class ThreadedEchoServer
{
public static void main(String[] args )
{
try
{
int i = 1;
ServerSocket s = new ServerSocket(8189);
while (true)
{
Socket incoming = s.accept();
System.out.println("Spawning " + i);
Runnable r = new ThreadedEchoHandler(incoming);
Thread t = new Thread(r);
t.start();
i++;
}
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
/**
This class handles the client input for one server socket connection.
*/
class ThreadedEchoHandler implements Runnable
{
/**
Constructs a handler.
@param i the incoming socket
@param c the counter for the handlers (used in prompts)
*/
public ThreadedEchoHandler(Socket i)
{
incoming = i;
}
public void run()
{
try
{
try
{
InputStream inStream = incoming.getInputStream();
OutputStream outStream = incoming.getOutputStream();
Scanner in = new Scanner(inStream);
PrintWriter out = new PrintWriter(outStream, true /* autoFlush */);
out.println( "Hello! Enter BYE to exit." );
// echo client input
boolean done = false;
while (!done && in.hasNextLine())
{
String line = in.nextLine();
out.println("Echo: " + line);
if (line.trim().equals("BYE"))
done = true;
}
}
finally
{
incoming.close();
}
}
catch (IOException e)
{
e.printStackTrace();
}
}
private Socket incoming;
}
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