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| 1 | +/* | |
| 2 | + * Copyright (c) 1995, 2000, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | +package sun.net; | |
| 26 | + | |
| 27 | +import java.io.*; | |
| 28 | +import java.net.Socket; | |
| 29 | +import java.net.ServerSocket; | |
| 30 | + | |
| 31 | +/** | |
| 32 | + * This is the base class for network servers. To define a new type | |
| 33 | + * of server define a new subclass of NetworkServer with a serviceRequest | |
| 34 | + * method that services one request. Start the server by executing: | |
| 35 | + * <pre> | |
| 36 | + * new MyServerClass().startServer(port); | |
| 37 | + * </pre> | |
| 38 | + */ | |
| 39 | +public class NetworkServer implements Runnable, Cloneable { | |
| 40 | + /** Socket for communicating with client. */ | |
| 41 | + public Socket clientSocket = null; | |
| 42 | + private Thread serverInstance; | |
| 43 | + private ServerSocket serverSocket; | |
| 44 | + | |
| 45 | + /** Stream for printing to the client. */ | |
| 46 | + public PrintStream clientOutput; | |
| 47 | + | |
| 48 | + /** Buffered stream for reading replies from client. */ | |
| 49 | + public InputStream clientInput; | |
| 50 | + | |
| 51 | + /** Close an open connection to the client. */ | |
| 52 | + public void close() throws IOException { | |
| 53 | + clientSocket.close(); | |
| 54 | + clientSocket = null; | |
| 55 | + clientInput = null; | |
| 56 | + clientOutput = null; | |
| 57 | + } | |
| 58 | + | |
| 59 | + /** Return client connection status */ | |
| 60 | + public boolean clientIsOpen() { | |
| 61 | + return clientSocket != null; | |
| 62 | + } | |
| 63 | + | |
| 64 | + final public void run() { | |
| 65 | + if (serverSocket != null) { | |
| 66 | + Thread.currentThread().setPriority(Thread.MAX_PRIORITY); | |
| 67 | + // System.out.print("Server starts " + serverSocket + "\n"); | |
| 68 | + while (true) { | |
| 69 | + try { | |
| 70 | + Socket ns = serverSocket.accept(); | |
| 71 | +// System.out.print("New connection " + ns + "\n"); | |
| 72 | + NetworkServer n = (NetworkServer)clone(); | |
| 73 | + n.serverSocket = null; | |
| 74 | + n.clientSocket = ns; | |
| 75 | + new Thread(n).start(); | |
| 76 | + } catch(Exception e) { | |
| 77 | + System.out.print("Server failure\n"); | |
| 78 | + e.printStackTrace(); | |
| 79 | + try { | |
| 80 | + serverSocket.close(); | |
| 81 | + } catch(IOException e2) {} | |
| 82 | + System.out.print("cs="+serverSocket+"\n"); | |
| 83 | + break; | |
| 84 | + } | |
| 85 | + } | |
| 86 | +// close(); | |
| 87 | + } else { | |
| 88 | + try { | |
| 89 | + clientOutput = new PrintStream( | |
| 90 | + new BufferedOutputStream(clientSocket.getOutputStream()), | |
| 91 | + false, "ISO8859_1"); | |
| 92 | + clientInput = new BufferedInputStream(clientSocket.getInputStream()); | |
| 93 | + serviceRequest(); | |
| 94 | + // System.out.print("Service handler exits | |
| 95 | + // "+clientSocket+"\n"); | |
| 96 | + } catch(Exception e) { | |
| 97 | + // System.out.print("Service handler failure\n"); | |
| 98 | + // e.printStackTrace(); | |
| 99 | + } | |
| 100 | + try { | |
| 101 | + close(); | |
| 102 | + } catch(IOException e2) {} | |
| 103 | + } | |
| 104 | + } | |
| 105 | + | |
| 106 | + /** Start a server on port <i>port</i>. It will call serviceRequest() | |
| 107 | + for each new connection. */ | |
| 108 | + final public void startServer(int port) throws IOException { | |
| 109 | + serverSocket = new ServerSocket(port, 50); | |
| 110 | + serverInstance = new Thread(this); | |
| 111 | + serverInstance.start(); | |
| 112 | + } | |
| 113 | + | |
| 114 | + /** Service one request. It is invoked with the clientInput and | |
| 115 | + clientOutput streams initialized. This method handles one client | |
| 116 | + connection. When it is done, it can simply exit. The default | |
| 117 | + server just echoes it's input. It is invoked in it's own private | |
| 118 | + thread. */ | |
| 119 | + public void serviceRequest() throws IOException { | |
| 120 | + byte buf[] = new byte[300]; | |
| 121 | + int n; | |
| 122 | + clientOutput.print("Echo server " + getClass().getName() + "\n"); | |
| 123 | + clientOutput.flush(); | |
| 124 | + while ((n = clientInput.read(buf, 0, buf.length)) >= 0) { | |
| 125 | + clientOutput.write(buf, 0, n); | |
| 126 | + } | |
| 127 | + } | |
| 128 | + | |
| 129 | + public static void main(String argv[]) { | |
| 130 | + try { | |
| 131 | + new NetworkServer ().startServer(8888); | |
| 132 | + } catch (IOException e) { | |
| 133 | + System.out.print("Server failed: "+e+"\n"); | |
| 134 | + } | |
| 135 | + } | |
| 136 | + | |
| 137 | + /** | |
| 138 | + * Clone this object; | |
| 139 | + */ | |
| 140 | + public Object clone() { | |
| 141 | + try { | |
| 142 | + return super.clone(); | |
| 143 | + } catch (CloneNotSupportedException e) { | |
| 144 | + // this shouldn't happen, since we are Cloneable | |
| 145 | + throw new InternalError(); | |
| 146 | + } | |
| 147 | + } | |
| 148 | + | |
| 149 | + public NetworkServer () { | |
| 150 | + } | |
| 151 | +} | |