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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * You should have received a copy of the GNU General Public License version
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package sun.net;

import java.io.*;
import java.net.Socket;
import java.net.ServerSocket;

This is the base class for network servers. To define a new type of server define a new subclass of NetworkServer with a serviceRequest method that services one request. Start the server by executing:
     new MyServerClass().startServer(port);
/** * This is the base class for network servers. To define a new type * of server define a new subclass of NetworkServer with a serviceRequest * method that services one request. Start the server by executing: * <pre> * new MyServerClass().startServer(port); * </pre> */
public class NetworkServer implements Runnable, Cloneable {
Socket for communicating with client.
/** Socket for communicating with client. */
public Socket clientSocket = null; private Thread serverInstance; private ServerSocket serverSocket;
Stream for printing to the client.
/** Stream for printing to the client. */
public PrintStream clientOutput;
Buffered stream for reading replies from client.
/** Buffered stream for reading replies from client. */
public InputStream clientInput;
Close an open connection to the client.
/** Close an open connection to the client. */
public void close() throws IOException { clientSocket.close(); clientSocket = null; clientInput = null; clientOutput = null; }
Return client connection status
/** Return client connection status */
public boolean clientIsOpen() { return clientSocket != null; } public final void run() { if (serverSocket != null) { Thread.currentThread().setPriority(Thread.MAX_PRIORITY); // System.out.print("Server starts " + serverSocket + "\n"); while (true) { try { Socket ns = serverSocket.accept(); // System.out.print("New connection " + ns + "\n"); NetworkServer n = (NetworkServer)clone(); n.serverSocket = null; n.clientSocket = ns; new Thread(null, n, "NetworkServer", 0, false).start(); } catch(Exception e) { System.out.print("Server failure\n"); e.printStackTrace(); try { serverSocket.close(); } catch(IOException e2) {} System.out.print("cs="+serverSocket+"\n"); break; } } // close(); } else { try { clientOutput = new PrintStream( new BufferedOutputStream(clientSocket.getOutputStream()), false, "ISO8859_1"); clientInput = new BufferedInputStream(clientSocket.getInputStream()); serviceRequest(); // System.out.print("Service handler exits // "+clientSocket+"\n"); } catch(Exception e) { // System.out.print("Service handler failure\n"); // e.printStackTrace(); } try { close(); } catch(IOException e2) {} } }
Start a server on port port. It will call serviceRequest() for each new connection.
/** Start a server on port <i>port</i>. It will call serviceRequest() for each new connection. */
public final void startServer(int port) throws IOException { serverSocket = new ServerSocket(port, 50); serverInstance = new Thread(null, this, "NetworkServer", 0, false); serverInstance.start(); }
Service one request. It is invoked with the clientInput and clientOutput streams initialized. This method handles one client connection. When it is done, it can simply exit. The default server just echoes it's input. It is invoked in it's own private thread.
/** Service one request. It is invoked with the clientInput and clientOutput streams initialized. This method handles one client connection. When it is done, it can simply exit. The default server just echoes it's input. It is invoked in it's own private thread. */
public void serviceRequest() throws IOException { byte buf[] = new byte[300]; int n; clientOutput.print("Echo server " + getClass().getName() + "\n"); clientOutput.flush(); while ((n = clientInput.read(buf, 0, buf.length)) >= 0) { clientOutput.write(buf, 0, n); } } public static void main(String argv[]) { try { new NetworkServer ().startServer(8888); } catch (IOException e) { System.out.print("Server failed: "+e+"\n"); } }
Clone this object;
/** * Clone this object; */
public Object clone() { try { return super.clone(); } catch (CloneNotSupportedException e) { // this shouldn't happen, since we are Cloneable throw new InternalError(e); } } public NetworkServer () { } }