JavaMail 入门（收发邮件）

package mail;

import java.io.File;
import java.util.ArrayList;
import java.util.Date;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Authenticator;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.NoSuchProviderException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;
import javax.mail.internet.MimeMessage.RecipientType;

/*******************************************************************************
 * @author hanwesley java Mail exaple
 */
public class Email {
    private static String context;

    public void setContext(String context) {
	this.context = context;
    }

    public static String getContext() {
	return context;
    }

    public ArrayList<MimeBodyPart> getAttachmentMultipart(String[] ss)
	    throws Exception {
	ArrayList<MimeBodyPart> parts = null;
	if (ss != null && ss.length > 0) {
	    int filesize = 0;
	    for (String s : ss) {
		File f = new File(s);
		filesize += f.length();
		if (filesize > 1 * 1024 * 1024) {
		    throw new Exception("attarch maxed!");
		}
		parts = new ArrayList<MimeBodyPart>();
		for (int i = 0; i < ss.length; i++) {
		    MimeBodyPart mbp = new MimeBodyPart();
		    FileDataSource fds = new FileDataSource(ss[i]);
		    mbp.setDataHandler(new DataHandler(fds));
		    mbp.setFileName(MimeUtility.encodeText(fds.getName(),
			    "GB2312", "B"));
		    parts.add(mbp);
		}
	    }
	}
	return parts;
    }

    public Session getSession() {
	Properties prop = new Properties();
	prop.put("mail.transport.protocol", "smtp");
	prop.put("mail.smtp.host", "smtp.163.com");
	prop.put("mail.smtp.port", 25);
	prop.put("mail.from", "[email protected]");
	prop.put("mail.smtp.auth", "true");
	Session session = null;// JavaMail核心类 一个会话
	session = Session.getDefaultInstance(prop, new Authenticator() {
	    protected PasswordAuthentication getPasswordAuthentication() {
		return new PasswordAuthentication("[email protected]",
			"123456");
	    }
	});
	// session=Session.getDefaultInstance(prop,null);
	session.setDebug(true);
	return session;
    }

    public void sendMessage(Message msg) throws Exception {

	Transport transport = getSession().getTransport();
	try {
	    // msg.setc
	    transport.connect();
	    // transport.connect("smtp.163.com", 25,
	    // "[email protected]","123456");
	    transport.send(msg);
	} catch (MessagingException e) {
	    e.printStackTrace();
	} finally {
	    try {
		transport.close();
	    } catch (MessagingException e) {
		e.printStackTrace();
	    }
	}
    }
    
    public void receiveMessage() throws Exception{
	Session session=getSession();
	Store store=session.getStore("pop3");
	store.connect("pop.163.com", "[email protected]", "123456");
	Folder inbox=store.getFolder("INBOX");
	inbox.open(Folder.READ_ONLY);
	Message msg=inbox.getMessage(1);
	System.out.println(msg.getSubject());
    }
    
    public void testSendMessager() throws Exception {
	Session session = getSession();
	
	Message msg = new MimeMessage(session);
	msg.setFrom();
	msg.setSubject("hello,world");
	String s = "[email protected],[email protected]";
	msg.setRecipients(RecipientType.TO, InternetAddress.parse(s));
	msg.setRecipient(RecipientType.CC, new InternetAddress(
		"[email protected]"));
	// msg.setText("");
	msg.setSentDate(new Date());
	String[] arr = new String[] { "d:\\two.txt" };
	Multipart mp = new MimeMultipart("mixed");
	MimeBodyPart mbp = new MimeBodyPart();
	mbp.setContent("it's a JavaMail example!<br/>hehe",
		"text/html;charset=GB2312");
	mp.addBodyPart(mbp);
	ArrayList<MimeBodyPart> mbparr = getAttachmentMultipart(arr);
	for (MimeBodyPart mb : mbparr) {
	    mp.addBodyPart(mb);
	}
	msg.setContent(mp);
	sendMessage(msg);

    }
    public static void main(String[] args) throws Exception {
	Email email = new Email();
	email.receiveMessage();
    }
}