001 /*
002 * Copyright 2001-2005 The Apache Software Foundation
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016 package examples;
017
018 import java.io.IOException;
019 import java.net.InetAddress;
020 import java.net.UnknownHostException;
021 import org.apache.commons.net.FingerClient;
022
023 /***
024 * This is an example of how you would implement the finger command
025 * in Java using NetComponents. The Java version is much shorter.
026 * But keep in mind that the Unix finger command reads all sorts of
027 * local files to output local finger information. This program only
028 * queries the finger daemon.
029 * <p>
030 * The -l flag is used to request long output from the server.
031 * <p>
032 ***/
033 public final class finger
034 {
035
036 public static final void main(String[] args)
037 {
038 boolean longOutput = false;
039 int arg = 0, index;
040 String handle, host;
041 FingerClient finger;
042 InetAddress address = null;
043
044 // Get flags. If an invalid flag is present, exit with usage message.
045 while (arg < args.length && args[arg].startsWith("-"))
046 {
047 if (args[arg].equals("-l"))
048 longOutput = true;
049 else
050 {
051 System.err.println("usage: finger [-l] [[[handle][@<server>]] ...]");
052 System.exit(1);
053 }
054 ++arg;
055 }
056
057
058 finger = new FingerClient();
059 // We want to timeout if a response takes longer than 60 seconds
060 finger.setDefaultTimeout(60000);
061
062 if (arg >= args.length)
063 {
064 // Finger local host
065
066 try
067 {
068 address = InetAddress.getLocalHost();
069 }
070 catch (UnknownHostException e)
071 {
072 System.err.println("Error unknown host: " + e.getMessage());
073 System.exit(1);
074 }
075
076 try
077 {
078 finger.connect(address);
079 System.out.print(finger.query(longOutput));
080 finger.disconnect();
081 }
082 catch (IOException e)
083 {
084 System.err.println("Error I/O exception: " + e.getMessage());
085 System.exit(1);
086 }
087
088 return ;
089 }
090
091 // Finger each argument
092 while (arg < args.length)
093 {
094
095 index = args[arg].lastIndexOf("@");
096
097 if (index == -1)
098 {
099 handle = args[arg];
100 try
101 {
102 address = InetAddress.getLocalHost();
103 }
104 catch (UnknownHostException e)
105 {
106 System.err.println("Error unknown host: " + e.getMessage());
107 System.exit(1);
108 }
109 }
110 else
111 {
112 handle = args[arg].substring(0, index);
113 host = args[arg].substring(index + 1);
114
115 try
116 {
117 address = InetAddress.getByName(host);
118 }
119 catch (UnknownHostException e)
120 {
121 System.err.println("Error unknown host: " + e.getMessage());
122 System.exit(1);
123 }
124 }
125
126 System.out.println("[" + address.getHostName() + "]");
127
128 try
129 {
130 finger.connect(address);
131 System.out.print(finger.query(longOutput, handle));
132 finger.disconnect();
133 }
134 catch (IOException e)
135 {
136 System.err.println("Error I/O exception: " + e.getMessage());
137 System.exit(1);
138 }
139
140 ++arg;
141 if (arg != args.length)
142 System.out.print("\n");
143 }
144 }
145 }
146