getmail.java

基于java开发的邮件系统

package com.tapando.mail;

//发邮件   
import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;
import java.io.*;

public class GetMail {
	public static String receive(String popServer, String popUser,
			String popPassword) {
		String mailContent = "";
		Store store = null;
		Folder folder = null;
		try {
			Properties props = System.getProperties();
			Session session = Session.getDefaultInstance(props, null);
			store = session.getStore("pop3");
			store.connect(popServer, popUser, popPassword);
			folder = store.getDefaultFolder();
			if (folder == null)
				throw new Exception("No     default     folder");
			folder = folder.getFolder("INBOX");
			if (folder == null)
				throw new Exception("No     POP3     INBOX");
			folder.open(Folder.READ_ONLY);
			Message[] msgs = folder.getMessages();
			for (int msgNum = 0; msgNum < msgs.length; msgNum++) {
				mailContent = mailContent + getMessage(msgs[msgNum])
						+ "\n\n\n\n";
			}
		} catch (Exception ex) {
			ex.printStackTrace();
		} finally {
			try {
				if (folder != null)
					folder.close(false);
				if (store != null)
					store.close();
			} catch (Exception ex2) {
				ex2.printStackTrace();
			}
		}
		return mailContent;
	}

	public static String getMessage(Message message) {
		String mailContent = null;
		try {
			String from = ((InternetAddress) message.getFrom()[0])
					.getPersonal();
			if (from == null)
				from = ((InternetAddress) message.getFrom()[0]).getAddress();
			mailContent = "FROM:     " + from;
			String subject = message.getSubject();
			mailContent = mailContent + "\n" + "SUBJECT:     " + subject;
			Part messagePart = message;
			Object content = messagePart.getContent();
			if (content instanceof Multipart) {
				messagePart = ((Multipart) content).getBodyPart(0);
				mailContent = mailContent + "\n"
						+ "[     Multipart     Message     ]";
			}
			mailContent = mailContent + "\n" + "CONTENT:     "
					+ content.toString();
			String contentType = messagePart.getContentType();
			mailContent = mailContent + "\n" + "CONTENT:" + contentType;
			if (contentType.startsWith("text/plain")
					|| contentType.startsWith("text/html")) {
				InputStream is = messagePart.getInputStream();
				BufferedReader reader = new BufferedReader(
						new InputStreamReader(is));
				String thisLine = reader.readLine();
				while (thisLine != null) {
					mailContent = mailContent + "\n" + thisLine;
					thisLine = reader.readLine();
				}
			}
		} catch (Exception ex) {
			ex.printStackTrace();
		}
		return mailContent;
	}
}