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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 | } | ||