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 + ";";}}