Coverage report

  %line %branch
examples.echo
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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.io.OutputStreamWriter;
 23   
 import java.io.PrintWriter;
 24   
 import java.net.InetAddress;
 25   
 import java.net.SocketException;
 26   
 import org.apache.commons.net.EchoTCPClient;
 27   
 import org.apache.commons.net.EchoUDPClient;
 28   
 
 29   
 /***
 30   
  * This is an example program demonstrating how to use the EchoTCPClient
 31   
  * and EchoUDPClient classes.  This program connects to the default echo
 32   
  * service port of a specified server, then reads lines from standard
 33   
  * input, writing them to the echo server, and then printing the echo.
 34   
  * The default is to use the TCP port.  Use the -udp flag to use the UDP
 35   
  * port.
 36   
  * <p>
 37   
  * Usage: echo [-udp] <hostname>
 38   
  * <p>
 39   
  ***/
 40  0 
 public final class echo
 41   
 {
 42   
 
 43   
     public static final void echoTCP(String host) throws IOException
 44   
     {
 45  0 
         EchoTCPClient client = new EchoTCPClient();
 46   
         BufferedReader input, echoInput;
 47   
         PrintWriter echoOutput;
 48   
         String line;
 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 
         System.out.println("Connected to " + host + ".");
 54  0 
         input = new BufferedReader(class="keyword">new InputStreamReader(System.in));
 55  0 
         echoOutput =
 56   
             new PrintWriter(class="keyword">new OutputStreamWriter(client.getOutputStream()), true);
 57  0 
         echoInput =
 58   
             new BufferedReader(class="keyword">new InputStreamReader(client.getInputStream()));
 59   
 
 60  0 
         while ((line = input.readLine()) != null)
 61   
         {
 62  0 
             echoOutput.println(line);
 63  0 
             System.out.println(echoInput.readLine());
 64   
         }
 65   
 
 66  0 
         client.disconnect();
 67  0 
     }
 68   
 
 69   
     public static final void echoUDP(String host) throws IOException
 70   
     {
 71   
         int length, count;
 72   
         byte[] data;
 73   
         String line;
 74   
         BufferedReader input;
 75   
         InetAddress address;
 76   
         EchoUDPClient client;
 77   
 
 78  0 
         input = new BufferedReader(class="keyword">new InputStreamReader(System.in));
 79  0 
         address = InetAddress.getByName(host);
 80  0 
         client = new EchoUDPClient();
 81   
 
 82  0 
         client.open();
 83   
         // If we don't receive an echo within 5 seconds, assume the packet is lost.
 84  0 
         client.setSoTimeout(5000);
 85  0 
         System.out.println("Ready to echo to " + host + ".");
 86   
 
 87   
         // Remember, there are no guarantees about the ordering of returned
 88   
         // UDP packets, so there is a chance the output may be jumbled.
 89  0 
         while ((line = input.readLine()) != null)
 90   
         {
 91  0 
             data = line.getBytes();
 92  0 
             client.send(data, address);
 93  0 
             count = 0;
 94   
             do
 95   
             {
 96   
                 try
 97   
                 {
 98  0 
                     length = client.receive(data);
 99   
                 }
 100   
                 // Here we catch both SocketException and InterruptedIOException,
 101   
                 // because even though the JDK 1.1 docs claim that
 102   
                 // InterruptedIOException is thrown on a timeout, it seems
 103   
                 // SocketException is also thrown.
 104  0 
                 catch (SocketException e)
 105   
                 {
 106   
                     // We timed out and assume the packet is lost.
 107  0 
                     System.err.println(
 108   
                         "SocketException: Timed out and dropped packet");
 109  0 
                     break;
 110   
                 }
 111  0 
                 catch (InterruptedIOException e)
 112   
                 {
 113   
                     // We timed out and assume the packet is lost.
 114  0 
                     System.err.println(
 115   
                         "InterruptedIOException: Timed out and dropped packet");
 116  0 
                     break;
 117  0 
                 }
 118  0 
                 System.out.print(new String(data, 0, length));
 119  0 
                 count += length;
 120   
             }
 121  0 
             while (count < data.length);
 122   
 
 123  0 
             System.out.println();
 124   
         }
 125   
 
 126  0 
         client.close();
 127  0 
     }
 128   
 
 129   
 
 130   
     public static final void main(String[] args)
 131   
     {
 132   
 
 133  0 
         if (args.length == 1)
 134   
         {
 135   
             try
 136   
             {
 137  0 
                 echoTCP(args[0]);
 138   
             }
 139  0 
             catch (IOException e)
 140   
             {
 141  0 
                 e.printStackTrace();
 142  0 
                 System.exit(1);
 143  0 
             }
 144   
         }
 145  0 
         else if (args.length == 2 && args[0].equals("-udp"))
 146   
         {
 147   
             try
 148   
             {
 149  0 
                 echoUDP(args[1]);
 150   
             }
 151  0 
             catch (IOException e)
 152   
             {
 153  0 
                 e.printStackTrace();
 154  0 
                 System.exit(1);
 155  0 
             }
 156   
         }
 157   
         else
 158   
         {
 159  0 
             System.err.println("Usage: echo [-udp] <hostname>");
 160  0 
             System.exit(1);
 161   
         }
 162   
 
 163  0 
     }
 164   
 
 165   
 }
 166   
 

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