mailhelper.java

21天学通java的示例程序源代码

package ezmail;

import javax.mail.*;
import javax.mail.internet.*;
import java.text.SimpleDateFormat;

/**
 *  Utility class for sending/retrieving messages using the JavaMail API.
 *
 *  @author Chad (shod) Darby, [e-mail]
 */
public class MailHelper {

	/**
	 *  Sends a simple text e-mail message.
	 *
	 *  @param mail session the JavaMail session
	 *  @param from e-mail address of the sender
	 *  @param to e-mail address of the recipient
	 *  @param subject subject of the e-mail message
	 *  @param messageText the actual text of the message
	 *
	 *  @throws javax.mail.MessagingFormatException problems sending message
	 */
	public static void sendMessage(Session mailSession,
								   								 String from, String to,
								   								 String subject, String messageText)
	  throws MessagingException {

		// Construct the message
		System.out.println("Constructing message -  from=" + from + "  to=" + to);
		InternetAddress fromAddress = new InternetAddress(from);
		InternetAddress toAddress = new InternetAddress(to);

		MimeMessage testMessage = new MimeMessage(mailSession);
		testMessage.setFrom(fromAddress);
		testMessage.addRecipient(javax.mail.Message.RecipientType.TO, toAddress);
	    testMessage.setSentDate(new java.util.Date());
		testMessage.setSubject(subject);
		testMessage.setText(messageText);
		System.out.println("Message constructed");

		// Now send the message
		Transport.send(testMessage);
		System.out.println("Message sent!");
	}

	/**
	 *  Retrieve a list of messages from user's inbox
	 *
	 *  @param inbox the user's inbox
	 *
	 *  @throws javax.mail.MessagingFormatException problems retrieving messages
	 */
	public static Message[] getMessages(Session mailSession, UserInfo theUserInfo)
		throws MessagingException {

			String pop3host = theUserInfo.getPop3host();
			String user = theUserInfo.getUser();
			String password = theUserInfo.getPassword();

			// Retrieve and connect to the Store
			System.out.println("Connecting to message store: " + pop3host);
			Store msgStore = mailSession.getStore("pop3");
			msgStore.connect(pop3host, user, password);
			System.out.println("Connected!");

			// Retrieve the INBOX  folder
			Folder inbox = msgStore.getDefaultFolder().getFolder("INBOX");
			inbox.open(Folder.READ_ONLY);

			// Retrieve a list of messages
			Message[] theMessages = inbox.getMessages();
			FetchProfile profile = new FetchProfile();
			profile.add(FetchProfile.Item.ENVELOPE);
			inbox.fetch(theMessages, profile);

			// Close up shop
			inbox.close(false);
			msgStore.close();

			return theMessages;
	}

	/**
	 *  Retrieves a message from user's inbox
	 *
	 *  @param inbox the user's inbox
	 *  @param msgNum message number
	 *
	 *  @throws javax.mail.MessagingFormatException message number not found
	 */
	public static Message getMessage(Session mailSession, UserInfo theUserInfo,  int msgNum)
		throws MessagingException {

			Message theMessage = null;

			String pop3host = theUserInfo.getPop3host();
			String user = theUserInfo.getUser();
			String password = theUserInfo.getPassword();

			// Retrieve and connect to the Store
			System.out.println("Connecting to message store: " + pop3host);
			Store msgStore = mailSession.getStore("pop3");
			msgStore.connect(pop3host, user, password);
			System.out.println("Connected!");

			// Retrieve the INBOX  folder
			Folder inbox = msgStore.getDefaultFolder().getFolder("INBOX");
			inbox.open(Folder.READ_ONLY);

				if (msgNum <= inbox.getMessageCount()) {
					theMessage = inbox.getMessage(msgNum);
				}
				else {
					// Close up shop
					inbox.close(false);
					msgStore.close();
					throw new MessagingException("Message number not found");
				}

			return theMessage;
	}

	/**
	 *  Utility methodfor formatting a date
	 *
	 *  @param theDate date to format
	 */
	public static String formatDate(java.util.Date theDate) {
		String result = dateFormatter.format(theDate);
		return result;
	}

	/**
	 *  Utility object for formatting the date
	 */
	private static  SimpleDateFormat dateFormatter
     						= new SimpleDateFormat ("dd.MMM.yyyy hh:mm:ss a");

}