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    1   package examples;
    2
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    56
    57  import java.io.IOException;
    58  import java.net.InetAddress;
    59  import java.net.UnknownHostException;
    60  import org.apache.commons.net.FingerClient;
    61
    62  /****
    63   * This is an example of how you would implement the finger command
    64   * in Java using NetComponents.  The Java version is much shorter.
    65   * But keep in mind that the Unix finger command reads all sorts of
    66   * local files to output local finger information.  This program only
    67   * queries the finger daemon.
    68   * <p>
    69   * The -l flag is used to request long output from the server.
    70   * <p>
    71   ***/
    72  public final class finger
    73  {
    74
    75      public static final void main(String[] args)
    76      {
    77          boolean longOutput = false;
    78          int arg = 0, index;
    79          String handle, host;
    80          FingerClient finger;
    81          InetAddress address = null;
    82
    83          // Get flags.  If an invalid flag is present, exit with usage message.
    84          while (arg < args.length && args[arg].startsWith("-"))
    85          {
    86              if (args[arg].equals("-l"))
    87                  longOutput = true;
    88              else
    89              {
    90                  System.err.println("usage: finger [-l] [[[handle][@<server>]] ...]");
    91                  System.exit(1);
    92              }
    93              ++arg;
    94          }
    95
    96
    97          finger = new FingerClient();
    98          // We want to timeout if a response takes longer than 60 seconds
    99          finger.setDefaultTimeout(60000);
    100
    101         if (arg >= args.length)
    102         {
    103             // Finger local host
    104
    105             try
    106             {
    107                 address = InetAddress.getLocalHost();
    108             }
    109             catch (UnknownHostException e)
    110             {
    111                 System.err.println("Error unknown host: " + e.getMessage());
    112                 System.exit(1);
    113             }
    114
    115             try
    116             {
    117                 finger.connect(address);
    118                 System.out.print(finger.query(longOutput));
    119                 finger.disconnect();
    120             }
    121             catch (IOException e)
    122             {
    123                 System.err.println("Error I/O exception: " + e.getMessage());
    124                 System.exit(1);
    125             }
    126
    127             return ;
    128         }
    129
    130         // Finger each argument
    131         while (arg < args.length)
    132         {
    133
    134             index = args[arg].lastIndexOf("@");
    135
    136             if (index == -1)
    137             {
    138                 handle = args[arg];
    139                 try
    140                 {
    141                     address = InetAddress.getLocalHost();
    142                 }
    143                 catch (UnknownHostException e)
    144                 {
    145                     System.err.println("Error unknown host: " + e.getMessage());
    146                     System.exit(1);
    147                 }
    148             }
    149             else
    150             {
    151                 handle = args[arg].substring(0, index);
    152                 host = args[arg].substring(index + 1);
    153
    154                 try
    155                 {
    156                     address = InetAddress.getByName(host);
    157                 }
    158                 catch (UnknownHostException e)
    159                 {
    160                     System.err.println("Error unknown host: " + e.getMessage());
    161                     System.exit(1);
    162                 }
    163             }
    164
    165             System.out.println("[" + address.getHostName() + "]");
    166
    167             try
    168             {
    169                 finger.connect(address);
    170                 System.out.print(finger.query(longOutput, handle));
    171                 finger.disconnect();
    172             }
    173             catch (IOException e)
    174             {
    175                 System.err.println("Error I/O exception: " + e.getMessage());
    176                 System.exit(1);
    177             }
    178
    179             ++arg;
    180             if (arg != args.length)
    181                 System.out.print("\n");
    182         }
    183     }
    184 }
    185

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