java之邮件发送

java实现邮件发送的方法很多，这里提供一种：

1.mail实体类

public class Mail {
	public String host = "";
	public String from="";
	public String password = "";
	public List<String> to=new ArrayList<String>();//目标邮件地址
	public List<File> att=new ArrayList<File>();//附件
	public String context;
	public String title;
	public String fromname;
	public Boolean hassend;
    
	/**
	 * 
	 * @param host 邮件键服务器
	 * @param from  发送邮件地址
	 * @param pwd   密码
	 * @param title 标题
	 * @param context 内容,html格式
	 */
	@SuppressWarnings("static-access")
	public Mail(String host,String from,String pwd,String title,String context){
		this.host=host;
		this.from=from;
		this.password=pwd;
		this.context=context;
		this.fromname=context;
		this.title=title;
		this.hassend = false;
	}

	/**
	 * 添加目标地址
	 * @param s
	 */
	public void addTarget(String s)throws NullPointerException,ParseException{
		this.to.add(s);
	}
	/**
	 * 添加附件
	 * @param s
	 */
    public boolean addAttach(String s){
		File f=new File(s);
		return this.addAttach(f);
	}
	/**
	 * 添加附件
	 * @param f
	 * @throws FileNotFoundException
	 */
    public boolean addAttach(File f){
		if(f.exists()&&f.isFile()){
			this.att.add(f);
			return true;
		}else{
			return false;
		}
	}
	
	/**
	 * 邮件内容
	 * @param context
	 */
	public void setContext(String context) {
		this.context = context;
	}
	/**
	 * 邮件标题
	 * @param title
	 */
	public void setTitle(String title) {
		this.title = title;
	}

2.具体实现方法

public void sendmail(Mail mail){
		if(mail.hassend) return;
		Integer status = 1;
		try{
			Properties props = new Properties();
			props.put("mail.smtp.host", mail.host);
			props.put("mail.smtp.auth", "true");

			Session mailSession = Session.getDefaultInstance(props);
			Message newMessage = new MimeMessage(mailSession);
			newMessage.setFrom(new InternetAddress(mail.from));
			
			for(String toa:mail.to){
			   newMessage.addRecipient(Message.RecipientType.TO,new InternetAddress(toa));
			}
			
			MailcapCommandMap mc = (MailcapCommandMap) CommandMap.getDefaultCommandMap();
        	        mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html");
        	        mc.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml");
        	        mc.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain");
        	        mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed");
        	        mc.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822");
        	        CommandMap.setDefaultCommandMap(mc);
       
			Multipart multipart = new MimeMultipart();
			
			BodyPart html=new MimeBodyPart();
 			html.setContent(mail.context, "text/html;charset=gbk"); 
			multipart.addBodyPart(html);
		        for(File s:mail.att){
				MimeBodyPart messageBodyPart = new MimeBodyPart();
				DataSource source = new FileDataSource(s);
				messageBodyPart.setDataHandler(new DataHandler(source));
				String FileName =  MimeUtility.encodeText(s.getName());
				 messageBodyPart.setFileName(FileName);
				multipart.addBodyPart(messageBodyPart);
		        }
			newMessage.setContent(multipart);
			newMessage.setSubject(mail.title);
			newMessage.setSentDate(new java.util.Date());
			//newMessage.setText(this.context);
			
			SMTPTransport t = (SMTPTransport) mailSession.getTransport("smtp");
			try{
				t.connect(mail.host, mail.from, mail.password);
				t.sendMessage(newMessage, newMessage.getAllRecipients());
			}catch(Exception e){
			    e.printStackTrace();
				status = 2;
			}finally{
				t.close();
				for(File f : mail.att)
					f.deleteOnExit();
			}
		        } catch (MessagingException e) {
			   e.printStackTrace();
			   status = 2; 
		        } catch (UnsupportedEncodingException e) {
			   e.printStackTrace();
			   status = 2;
		       } finally{
			   mail.hassend = true;
			   String maillist = "";
			   for(String m : mail.to)
				maillist += m + ";";
		}
	}