    View Javadoc
    1   package examples;
    2
    3   /* ====================================================================
    4    * The Apache Software License, Version 1.1
    5    *
    6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
    7    * reserved.
    8    *
    9    * Redistribution and use in source and binary forms, with or without
    10   * modification, are permitted provided that the following conditions
    11   * are met:
    12   *
    13   * 1. Redistributions of source code must retain the above copyright
    14   *    notice, this list of conditions and the following disclaimer.
    15   *
    16   * 2. Redistributions in binary form must reproduce the above copyright
    17   *    notice, this list of conditions and the following disclaimer in
    18   *    the documentation and/or other materials provided with the
    19   *    distribution.
    20   *
    21   * 3. The end-user documentation included with the redistribution,
    22   *    if any, must include the following acknowledgment:
    23   *       "This product includes software developed by the
    24   *        Apache Software Foundation (http://www.apache.org/)."
    25   *    Alternately, this acknowledgment may appear in the software itself,
    26   *    if and wherever such third-party acknowledgments normally appear.
    27   *
    28   * 4. The names "Apache" and "Apache Software Foundation" and
    29   *    "Apache Commons" must not be used to endorse or promote products
    30   *    derived from this software without prior written permission. For
    31   *    written permission, please contact apache@apache.org.
    32   *
    33   * 5. Products derived from this software may not be called "Apache",
    34   *    nor may "Apache" appear in their name, without
    35   *    prior written permission of the Apache Software Foundation.
    36   *
    37   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
    38   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    39   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    40   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
    41   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    42   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    43   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
    44   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    45   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    46   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
    47   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    48   * SUCH DAMAGE.
    49   * ====================================================================
    50   *
    51   * This software consists of voluntary contributions made by many
    52   * individuals on behalf of the Apache Software Foundation.  For more
    53   * information on the Apache Software Foundation, please see
    54   * <http://www.apache.org/>;.
    55   */
    56
    57  import java.io.BufferedReader;
    58  import java.io.IOException;
    59  import java.io.InputStreamReader;
    60  import java.io.InterruptedIOException;
    61  import java.io.OutputStreamWriter;
    62  import java.io.PrintWriter;
    63  import java.net.InetAddress;
    64  import java.net.SocketException;
    65  import org.apache.commons.net.EchoTCPClient;
    66  import org.apache.commons.net.EchoUDPClient;
    67
    68  /****
    69   * This is an example program demonstrating how to use the EchoTCPClient
    70   * and EchoUDPClient classes.  This program connects to the default echo
    71   * service port of a specified server, then reads lines from standard
    72   * input, writing them to the echo server, and then printing the echo.
    73   * The default is to use the TCP port.  Use the -udp flag to use the UDP
    74   * port.
    75   * <p>
    76   * Usage: echo [-udp] <hostname>
    77   * <p>
    78   ***/
    79  public final class echo
    80  {
    81
    82      public static final void echoTCP(String host) throws IOException
    83      {
    84          EchoTCPClient client = new EchoTCPClient();
    85          BufferedReader input, echoInput;
    86          PrintWriter echoOutput;
    87          String line;
    88
    89          // We want to timeout if a response takes longer than 60 seconds
    90          client.setDefaultTimeout(60000);
    91          client.connect(host);
    92          System.out.println("Connected to " + host + ".");
    93          input = new BufferedReader(new InputStreamReader(System.in));
    94          echoOutput =
    95              new PrintWriter(new OutputStreamWriter(client.getOutputStream()), true);
    96          echoInput =
    97              new BufferedReader(new InputStreamReader(client.getInputStream()));
    98
    99          while ((line = input.readLine()) != null)
    100         {
    101             echoOutput.println(line);
    102             System.out.println(echoInput.readLine());
    103         }
    104
    105         client.disconnect();
    106     }
    107
    108     public static final void echoUDP(String host) throws IOException
    109     {
    110         int length, count;
    111         byte[] data;
    112         String line;
    113         BufferedReader input;
    114         InetAddress address;
    115         EchoUDPClient client;
    116
    117         input = new BufferedReader(new InputStreamReader(System.in));
    118         address = InetAddress.getByName(host);
    119         client = new EchoUDPClient();
    120
    121         client.open();
    122         // If we don't receive an echo within 5 seconds, assume the packet is lost.
    123         client.setSoTimeout(5000);
    124         System.out.println("Ready to echo to " + host + ".");
    125
    126         // Remember, there are no guarantees about the ordering of returned
    127         // UDP packets, so there is a chance the output may be jumbled.
    128         while ((line = input.readLine()) != null)
    129         {
    130             data = line.getBytes();
    131             client.send(data, address);
    132             count = 0;
    133             do
    134             {
    135                 try
    136                 {
    137                     length = client.receive(data);
    138                 }
    139                 // Here we catch both SocketException and InterruptedIOException,
    140                 // because even though the JDK 1.1 docs claim that
    141                 // InterruptedIOException is thrown on a timeout, it seems
    142                 // SocketException is also thrown.
    143                 catch (SocketException e)
    144                 {
    145                     // We timed out and assume the packet is lost.
    146                     System.err.println(
    147                         "SocketException: Timed out and dropped packet");
    148                     break;
    149                 }
    150                 catch (InterruptedIOException e)
    151                 {
    152                     // We timed out and assume the packet is lost.
    153                     System.err.println(
    154                         "InterruptedIOException: Timed out and dropped packet");
    155                     break;
    156                 }
    157                 System.out.print(new String(data, 0, length));
    158                 count += length;
    159             }
    160             while (count < data.length);
    161
    162             System.out.println();
    163         }
    164
    165         client.close();
    166     }
    167
    168
    169     public static final void main(String[] args)
    170     {
    171
    172         if (args.length == 1)
    173         {
    174             try
    175             {
    176                 echoTCP(args[0]);
    177             }
    178             catch (IOException e)
    179             {
    180                 e.printStackTrace();
    181                 System.exit(1);
    182             }
    183         }
    184         else if (args.length == 2 && args[0].equals("-udp"))
    185         {
    186             try
    187             {
    188                 echoUDP(args[1]);
    189             }
    190             catch (IOException e)
    191             {
    192                 e.printStackTrace();
    193                 System.exit(1);
    194             }
    195         }
    196         else
    197         {
    198             System.err.println("Usage: echo [-udp] <hostname>");
    199             System.exit(1);
    200         }
    201
    202     }
    203
    204 }
    205

This page was automatically generated by Maven