使用javamail发送会议邀请

网上找了很多关于javamail发送会议请求的文章，终于成功了，没有使用ical4j，发送的outlook直接打开就是一个会议请求，而不是以附件的形式存在。具体的注意点在代码中以注释的形式标明。

DESCRIPTION中如果想换行，换行符为：=0D=0A

关于icalendar的规范，请看：https://rsync.tools.ietf.org/html/rfc5545

public class Email {private static String EMAIL_CONFIG = "email_config.properties";private Properties emailProp = new Properties();public Email() {InputStream is = getClass().getResourceAsStream("/"+EMAIL_CONFIG);try {emailProp.load(is);} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}private class EmailAuthenticator extends Authenticator {protected PasswordAuthentication getPasswordAuthentication() {String userId = emailProp.getProperty("userId", "");String password = emailProp.getProperty("password", "");return new PasswordAuthentication(userId, password);}}public void send() throws Exception {try {String fromEmail = emailProp.getProperty("fromEmail", "");String toEmail=emailProp.getProperty("toEmail", ""); Properties props = new Properties();try {props.put("mail.smtp.port", "587");props.put("mail.smtp.host", "smtp.gmail.com");props.put("mail.transport.protocol", "smtp");props.put("mail.smtp.auth", "true");props.put("mail.smtp.starttls.enable", "true");props.put("mail.smtp.ssl", "true");} catch (Exception e) {e.printStackTrace();}Session session;Authenticator authenticator = new EmailAuthenticator();session = Session.getInstance(props, authenticator);MimeMessage message = new MimeMessage(session);message.setFrom(new InternetAddress(fromEmail));message.addRecipient(Message.RecipientType.TO, new InternetAddress(toEmail));message.setSubject("Outlook Meeting Request Using JavaMail");StringBuffer buffer = new StringBuffer();buffer.append("BEGIN:VCALENDAR\n"+ "PRODID:-//Microsoft Corporation//Outlook 9.0 MIMEDIR//EN\n"+ "VERSION:2.0\n"+ "METHOD:REQUEST\n"+ "BEGIN:VEVENT\n"+ "ATTENDEE;ROLE=REQ-PARTICIPANT;RSVP=TRUE:MAILTO:"+toEmail+"\n"+ "ORGANIZER:MAILTO:"+toEmail+"\n"+ "DTSTART:20120302T060000Z\n"+ "DTEND:20120302T070000Z\n"+ "LOCATION:Conference room\n"+ "UID:"+UUID.randomUUID().toString()+"\n"//如果id相同的话，outlook会认为是同一个会议请求，所以使用uuid。+ "CATEGORIES:SuccessCentral Reminder\n"+ "DESCRIPTION:This the description of the meeting.<br>asd;flkjasdpfi\n\n"+ "SUMMARY:Test meeting request\n" + "PRIORITY:5\n"+ "CLASS:PUBLIC\n" + "BEGIN:VALARM\n"+ "TRIGGER:-PT15M\n" + "ACTION:DISPLAY\n"+ "DESCRIPTION:Reminder\n" + "END:VALARM\n"+ "END:VEVENT\n" + "END:VCALENDAR");BodyPart messageBodyPart = new MimeBodyPart();// 测试下来如果不这么转换的话，会以纯文本的形式发送过去，//如果没有method=REQUEST;charset=\"UTF-8\"，outlook会议附件的形式存在，而不是直接打开就是一个会议请求messageBodyPart.setDataHandler(new DataHandler(new ByteArrayDataSource(buffer.toString(), "text/calendar;method=REQUEST;charset=\"UTF-8\"")));Multipart multipart = new MimeMultipart();multipart.addBodyPart(messageBodyPart);message.setContent(multipart);Transport.send(message);} catch (MessagingException me) {me.printStackTrace();} catch (Exception ex) {ex.printStackTrace();}}public static void main(String[] args) {try {Email email = new Email();email.send();System.out.println("success");} catch (Exception e) {e.printStackTrace();}}}