JavaMail的实现

今天研究了一下JavaMail,总算对它有了点新的认识.
需要两个包,mail.jar,activation.jar.
以下是实现代码:

package javamaildemo;

import java.io.IOException;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.AuthenticationFailedException;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

public class EmailUtil {
	
	//要发送Email地址
	private String mailTo;
	//Mail发送的起始地址
	private String mailFrom;
	//smtp的地址
	private String smtpHost;
	//是否采用debug模式
	private boolean debug = false;
	//邮件主题
	private String subject;
	//邮件内容
	private String msgContent;
	//邮件类型
	private String msgContentMimeType="text/html;charset=UTF-8";
	//邮件附件列表
	private List attachedFileList;
	//附件的位置
	private String messageBasePath;
	
	public EmailUtil()
	{
		super();
	}
	
	/*
	 * 填充Email内容,包括发件人,收件人,主题,主体,附件,发信日期
	 * @param Session,MimeMessage
	 */
	public void fillMail(Session session,MimeMessage msg)throws IOException, MessagingException
	{
		String fileName;
		Multipart mPart=new MimeMultipart();
		if(mailFrom != null)
		{
			msg.setFrom(new InternetAddress(mailFrom));
			System.out.println("发送人Email地址: " + mailFrom);
		}
		else
		{
			System.out.println("没有指定发送人邮件地址!");
			return;
		}
		
		if(mailTo !=null)
		{
			InternetAddress[] address = InternetAddress.parse(mailTo);
			msg.setRecipients(Message.RecipientType.TO, address);
			System.out.println("收件人Email地址: "+mailTo);
		}
		else
		{
			System.out.println("没有指定收件人邮件地址!");
			return;
		}
		msg.setSubject(subject);
		InternetAddress[] replyAddress = {new InternetAddress(mailFrom)};
		msg.setReplyTo(replyAddress);
		
		MimeBodyPart mBodyContent = new MimeBodyPart();
		if(msgContent != null)
		{
			mBodyContent.setContent(msgContent, msgContentMimeType);
		}
		else
		{
			mBodyContent.setContent("",msgContentMimeType);
		}
		mPart.addBodyPart(mBodyContent);
		
		if(attachedFileList != null)
		{
			for(Iterator i=attachedFileList.iterator();i.hasNext();)
			{
				fileName = (String)i.next();
				MimeBodyPart mBodyPart = new MimeBodyPart();
				FileDataSource fds = new FileDataSource(messageBasePath + fileName);
				System.out.println("Mail发送的附件为: "+messageBasePath + fileName);
				mBodyPart.setDataHandler(new DataHandler(fds));
				mBodyPart.setFileName(fileName);
				mPart.addBodyPart(mBodyPart);
			}
		}
		msg.setContent(mPart);
		msg.setSentDate(new Date());		
	}
	
	/*
	 * 发送Email,返回0表示邮件发送成功,返回3表示邮件发送失败
	 * @return int
	 */
	public int sendEmail() throws IOException,MessagingException
	{
		Properties props = System.getProperties();
		props.put("mail.smtp.host", smtpHost);
		props.put("mail.smtp.auth", "true");
		
		MailAuthenticator auth = new MailAuthenticator();
		Session session = Session.getInstance(props,auth);
		session.setDebug(debug);
		MimeMessage msg = new MimeMessage(session);
		
		Transport trans = null;
		try
		{
			fillMail(session,msg);
			trans = session.getTransport("smtp");
			try
			{
				trans.connect(smtpHost,auth.USER,auth.PASSWORD);
			}
			catch(AuthenticationFailedException e)
			{
				e.printStackTrace();
				System.out.println("连接邮件服务器错误!");
				return 3;
			}
			catch(MessagingException e)
			{
				System.out.println("连接邮件服务器错误!");
				return 3;
			}
			trans.send(msg);
			trans.close();
		}
		catch(MessagingException mex)
		{
			System.out.println("发送邮件失败!");
			mex.printStackTrace();
			Exception ex = null;
			if((ex=mex.getNextException())!=null)
			{
				System.out.println(ex.toString());
				ex.printStackTrace();
			}
			return 3;
		}
		finally
		{
			try{
				if(trans != null && trans.isConnected())
					trans.close();
			}catch(Exception e){
				System.out.println(e.toString());
			}
		}
		System.out.println("发送邮件成功!");
		return 0;
	}
	
	class MailAuthenticator extends Authenticator
	{
		private String USER="帐号";
		private String PASSWORD="密码";
		protected PasswordAuthentication getPasswordAuthentication() {
			return new PasswordAuthentication(USER,PASSWORD);
		}
	}

	public boolean isDebug() {
		return debug;
	}

	public void setDebug(boolean debug) {
		this.debug = debug;
	}

	public String getMailFrom() {
		return mailFrom;
	}

	public void setMailFrom(String mailFrom) {
		this.mailFrom = mailFrom;
	}

	public String getMailTo() {
		return mailTo;
	}

	public void setMailTo(String mailTo) {
		this.mailTo = mailTo;
	}

	public String getMsgContent() {
		return msgContent;
	}

	public void setMsgContent(String msgContent) {
		this.msgContent = msgContent;
	}

	public String getSmtpHost() {
		return smtpHost;
	}

	public void setSmtpHost(String smtpHost) {
		this.smtpHost = smtpHost;
	}

	public String getSubject() {
		return subject;
	}

	public void setSubject(String subject) {
		this.subject = subject;
	}

	public String getMsgContentMimeType() {
		return msgContentMimeType;
	}

	public void setMsgContentMimeType(String msgContentMimeType) {
		this.msgContentMimeType = msgContentMimeType;
	}

	public List getAttachedFileList() {
		return attachedFileList;
	}

	public void setAttachedFileList(List attachedFileList) {
		this.attachedFileList = attachedFileList;
	}

	public String getMessageBasePath() {
		return messageBasePath;
	}

	public void setMessageBasePath(String messageBasePath) {
		this.messageBasePath = messageBasePath;
	}
}