FileDocCategorySizeDatePackage
messages.javaAPI DocApache Commons NET 1.4.1 API4077Sat Dec 03 10:05:48 GMT 2005examples

messages

public final class messages extends Object
This is an example program demonstrating how to use the POP3Client class. This program connects to a POP3 server and retrieves the message headers of all the messages, printing the From: and Subject: header entries for each message.

Usage: messages

Fields Summary
Constructors Summary
Methods Summary
public static final voidmain(java.lang.String[] args)

        int message;
        String server, username, password;
        POP3Client pop3;
        Reader reader;
        POP3MessageInfo[] messages;

        if (args.length < 3)
        {
            System.err.println(
                "Usage: messages <pop3 server hostname> <username> <password>");
            System.exit(1);
        }

        server = args[0];
        username = args[1];
        password = args[2];

        pop3 = new POP3Client();
        // We want to timeout if a response takes longer than 60 seconds
        pop3.setDefaultTimeout(60000);

        try
        {
            pop3.connect(server);
        }
        catch (IOException e)
        {
            System.err.println("Could not connect to server.");
            e.printStackTrace();
            System.exit(1);
        }

        try
        {
            if (!pop3.login(username, password))
            {
                System.err.println("Could not login to server.  Check password.");
                pop3.disconnect();
                System.exit(1);
            }

            messages = pop3.listMessages();

            if (messages == null)
            {
                System.err.println("Could not retrieve message list.");
                pop3.disconnect();
                System.exit(1);
            }
            else if (messages.length == 0)
            {
                System.out.println("No messages");
                pop3.logout();
                pop3.disconnect();
                System.exit(1);
            }

            for (message = 0; message < messages.length; message++)
            {
                reader = pop3.retrieveMessageTop(messages[message].number, 0);

                if (reader == null)
                {
                    System.err.println("Could not retrieve message header.");
                    pop3.disconnect();
                    System.exit(1);
                }

                printMessageInfo(new BufferedReader(reader), messages[message].number);
            }

            pop3.logout();
            pop3.disconnect();
        }
        catch (IOException e)
        {
            e.printStackTrace();
            System.exit(1);
        }
public static final voidprintMessageInfo(java.io.BufferedReader reader, int id)

        String line, lower, from, subject;

        from = "";
        subject = "";

        while ((line = reader.readLine()) != null)
        {
            lower = line.toLowerCase();
            if (lower.startsWith("from: "))
                from = line.substring(6).trim();
            else if (lower.startsWith("subject: "))
                subject = line.substring(9).trim();
        }

        System.out.println(Integer.toString(id) + " From: " + from +
                           "  Subject: " + subject);