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    1   package examples;
    2
    3   /* ====================================================================
    4    * The Apache Software License, Version 1.1
    5    *
    6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
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    9    * Redistribution and use in source and binary forms, with or without
    10   * modification, are permitted provided that the following conditions
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    14   *    notice, this list of conditions and the following disclaimer.
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    18   *    the documentation and/or other materials provided with the
    19   *    distribution.
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    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
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    25   *    Alternately, this acknowledgment may appear in the software itself,
    26   *    if and wherever such third-party acknowledgments normally appear.
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    54   * <http://www.apache.org/>;.
    55   */
    56
    57  import java.io.BufferedReader;
    58  import java.io.IOException;
    59  import java.io.Reader;
    60  import org.apache.commons.net.pop3.POP3Client;
    61  import org.apache.commons.net.pop3.POP3MessageInfo;
    62
    63  /****
    64   * This is an example program demonstrating how to use the POP3Client class.
    65   * This program connects to a POP3 server and retrieves the message
    66   * headers of all the messages, printing the From: and Subject: header
    67   * entries for each message.
    68   * <p>
    69   * Usage: messages <pop3 server hostname> <username> <password>
    70   * <p>
    71   ***/
    72  public final class messages
    73  {
    74
    75      public static final void printMessageInfo(BufferedReader reader, int id)
    76      throws IOException
    77      {
    78          String line, lower, from, subject;
    79
    80          from = "";
    81          subject = "";
    82
    83          while ((line = reader.readLine()) != null)
    84          {
    85              lower = line.toLowerCase();
    86              if (lower.startsWith("from: "))
    87                  from = line.substring(6).trim();
    88              else if (lower.startsWith("subject: "))
    89                  subject = line.substring(9).trim();
    90          }
    91
    92          System.out.println(Integer.toString(id) + " From: " + from +
    93                             "  Subject: " + subject);
    94      }
    95
    96      public static final void main(String[] args)
    97      {
    98          int message;
    99          String server, username, password;
    100         POP3Client pop3;
    101         Reader reader;
    102         POP3MessageInfo[] messages;
    103
    104         if (args.length < 3)
    105         {
    106             System.err.println(
    107                 "Usage: messages <pop3 server hostname> <username> <password>");
    108             System.exit(1);
    109         }
    110
    111         server = args[0];
    112         username = args[1];
    113         password = args[2];
    114
    115         pop3 = new POP3Client();
    116         // We want to timeout if a response takes longer than 60 seconds
    117         pop3.setDefaultTimeout(60000);
    118
    119         try
    120         {
    121             pop3.connect(server);
    122         }
    123         catch (IOException e)
    124         {
    125             System.err.println("Could not connect to server.");
    126             e.printStackTrace();
    127             System.exit(1);
    128         }
    129
    130         try
    131         {
    132             if (!pop3.login(username, password))
    133             {
    134                 System.err.println("Could not login to server.  Check password.");
    135                 pop3.disconnect();
    136                 System.exit(1);
    137             }
    138
    139             messages = pop3.listMessages();
    140
    141             if (messages == null)
    142             {
    143                 System.err.println("Could not retrieve message list.");
    144                 pop3.disconnect();
    145                 System.exit(1);
    146             }
    147             else if (messages.length == 0)
    148             {
    149                 System.out.println("No messages");
    150                 pop3.logout();
    151                 pop3.disconnect();
    152                 System.exit(1);
    153             }
    154
    155             for (message = 0; message < messages.length; message++)
    156             {
    157                 reader = pop3.retrieveMessageTop(messages[message].number, 0);
    158
    159                 if (reader == null)
    160                 {
    161                     System.err.println("Could not retrieve message header.");
    162                     pop3.disconnect();
    163                     System.exit(1);
    164                 }
    165
    166                 printMessageInfo(new BufferedReader(reader), messages[message].number);
    167             }
    168
    169             pop3.logout();
    170             pop3.disconnect();
    171         }
    172         catch (IOException e)
    173         {
    174             e.printStackTrace();
    175             System.exit(1);
    176         }
    177     }
    178 }
    179

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