Coverage report

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examples.chargen
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 1   
 /*
 2   
  * Copyright 2001-2005 The Apache Software Foundation
 3   
  *
 4   
  * Licensed under the Apache License, Version 2.0 (the "License");
 5   
  * you may not use this file except in compliance with the License.
 6   
  * You may obtain a copy of the License at
 7   
  *
 8   
  *     http://www.apache.org/licenses/LICENSE-2.0
 9   
  *
 10   
  * Unless required by applicable law or agreed to in writing, software
 11   
  * distributed under the License is distributed on an "AS IS" BASIS,
 12   
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 13   
  * See the License for the specific language governing permissions and
 14   
  * limitations under the License.
 15   
  */
 16   
 package examples;
 17   
 
 18   
 import java.io.BufferedReader;
 19   
 import java.io.IOException;
 20   
 import java.io.InputStreamReader;
 21   
 import java.io.InterruptedIOException;
 22   
 import java.net.InetAddress;
 23   
 import java.net.SocketException;
 24   
 import org.apache.commons.net.CharGenTCPClient;
 25   
 import org.apache.commons.net.CharGenUDPClient;
 26   
 
 27   
 /***
 28   
  * This is an example program demonstrating how to use the CharGenTCPClient
 29   
  * and CharGenUDPClient classes.  This program connects to the default
 30   
  * chargen service port of a specified server, then reads 100 lines from
 31   
  * of generated output, writing each line to standard output, and then
 32   
  * closes the connection.  The UDP invocation of the program sends 50
 33   
  * datagrams, printing the reply to each.
 34   
  * The default is to use the TCP port.  Use the -udp flag to use the UDP
 35   
  * port.
 36   
  * <p>
 37   
  * Usage: chargen [-udp] <hostname>
 38   
  * <p>
 39   
  ***/
 40  0 
 public final class chargen
 41   
 {
 42   
 
 43   
     public static final void chargenTCP(String host) throws IOException
 44   
     {
 45  0 
         int lines = 100;
 46   
         String line;
 47  0 
         CharGenTCPClient client = new CharGenTCPClient();
 48   
         BufferedReader chargenInput;
 49   
 
 50   
         // We want to timeout if a response takes longer than 60 seconds
 51  0 
         client.setDefaultTimeout(60000);
 52  0 
         client.connect(host);
 53  0 
         chargenInput =
 54   
             new BufferedReader(class="keyword">new InputStreamReader(client.getInputStream()));
 55   
 
 56   
         // We assume the chargen service outputs lines, but it really doesn't
 57   
         // have to, so this code might actually not work if no newlines are
 58   
         // present.
 59  0 
         while (lines-- > 0)
 60   
         {
 61  0 
             if ((line = chargenInput.readLine()) == null)
 62  0 
                 break;
 63  0 
             System.out.println(line);
 64   
         }
 65   
 
 66  0 
         client.disconnect();
 67  0 
     }
 68   
 
 69   
     public static final void chargenUDP(String host) throws IOException
 70   
     {
 71  0 
         int packets = 50;
 72   
         byte[] data;
 73   
         InetAddress address;
 74   
         CharGenUDPClient client;
 75   
 
 76  0 
         address = InetAddress.getByName(host);
 77  0 
         client = new CharGenUDPClient();
 78   
 
 79  0 
         client.open();
 80   
         // If we don't receive a return packet within 5 seconds, assume
 81   
         // the packet is lost.
 82  0 
         client.setSoTimeout(5000);
 83   
 
 84  0 
         while (packets-- > 0)
 85   
         {
 86  0 
             client.send(address);
 87   
 
 88   
             try
 89   
             {
 90  0 
                 data = client.receive();
 91   
             }
 92   
             // Here we catch both SocketException and InterruptedIOException,
 93   
             // because even though the JDK 1.1 docs claim that
 94   
             // InterruptedIOException is thrown on a timeout, it seems
 95   
             // SocketException is also thrown.
 96  0 
             catch (SocketException e)
 97   
             {
 98   
                 // We timed out and assume the packet is lost.
 99  0 
                 System.err.println("SocketException: Timed out and dropped packet");
 100  0 
                 continue;
 101   
             }
 102  0 
             catch (InterruptedIOException e)
 103   
             {
 104   
                 // We timed out and assume the packet is lost.
 105  0 
                 System.err.println(
 106   
                     "InterruptedIOException: Timed out and dropped packet");
 107  0 
                 continue;
 108  0 
             }
 109  0 
             System.out.write(data);
 110  0 
             System.out.flush();
 111   
         }
 112   
 
 113  0 
         client.close();
 114  0 
     }
 115   
 
 116   
 
 117   
     public static final void main(String[] args)
 118   
     {
 119   
 
 120  0 
         if (args.length == 1)
 121   
         {
 122   
             try
 123   
             {
 124  0 
                 chargenTCP(args[0]);
 125   
             }
 126  0 
             catch (IOException e)
 127   
             {
 128  0 
                 e.printStackTrace();
 129  0 
                 System.exit(1);
 130  0 
             }
 131   
         }
 132  0 
         else if (args.length == 2 && args[0].equals("-udp"))
 133   
         {
 134   
             try
 135   
             {
 136  0 
                 chargenUDP(args[1]);
 137   
             }
 138  0 
             catch (IOException e)
 139   
             {
 140  0 
                 e.printStackTrace();
 141  0 
                 System.exit(1);
 142  0 
             }
 143   
         }
 144   
         else
 145   
         {
 146  0 
             System.err.println("Usage: chargen [-udp] <hostname>");
 147  0 
             System.exit(1);
 148   
         }
 149   
 
 150  0 
     }
 151   
 
 152   
 }
 153   
 

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