日历邀请包含图像的HTML正文

1 回答

• 0

  Try using the below code which contains a method to attach inline images along with email invitations and normal attachments just adjust the code according to your need

  private String senderAddress = "YOUR EMAIL ADDRESS";
      private final String password = "YOUR EMAIL PASSWORD";
      public static SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd'T'HHmm'00'");
      public static SimpleDateFormat dateParser = new SimpleDateFormat("dd-MM-yyyy HH:mm");
      public static SimpleDateFormat dateFormater = new SimpleDateFormat("dd-MM-yyyy");
  
      public String getSenderAddress() {
          return senderAddress;
      }
  
      public String getPassword() {
          return password;
      }
  
      public Session getMailSession() {
  
          Properties props = new Properties();
          props.put("mail.smtp.host", "smtp.gmail.com");
          props.put("mail.smtp.port", "587");
          props.put("mail.smtp.auth", "true");
          props.put("mail.smtp.starttls.enable", "true");
  
          return Session.getInstance(props, new javax.mail.Authenticator() {
              protected PasswordAuthentication getPasswordAuthentication() {
                  return new PasswordAuthentication(getSenderAddress(), getPassword());
              }
          });
      }
  
      public String newSend(Invitation invitation, String methodType)  {
  
          String UID = null;
  
          // register the text/calendar mime type
          MimetypesFileTypeMap mimetypes = (MimetypesFileTypeMap) MimetypesFileTypeMap.getDefaultFileTypeMap();
          mimetypes.addMimeTypes("text/calendar ics ICS");
  
          // register the handling of text/calendar mime type
          MailcapCommandMap mailcap = (MailcapCommandMap) MailcapCommandMap.getDefaultCommandMap();
          mailcap.addMailcap("text/calendar;; x-java-content-handler=com.sun.mail.handlers.text_plain");
  
          MimeMessage message = new MimeMessage(getMailSession());
          try {
              message.setFrom(new InternetAddress(senderAddress));
              message.setSubject(invitation.getSubject());
              message.addRecipient(Message.RecipientType.TO, new InternetAddress(invitation.getTo()));
  
              Multipart multipart = new MimeMultipart("mixed");
              invitation.setDescription(getHtmlWithEncodedImages(multipart,invitation));
  
              Multipart mpMixedAlternative = newChild(multipart, "alternative");
  
              // html part
              BodyPart messageBodyPart = buildHtmlTextPart(invitation);
              mpMixedAlternative.addBodyPart(messageBodyPart);
  
              // Add part two, the calendar
              BodyPart calendarPart = buildCalendarPart(invitation, methodType);
              calendarPart.setDisposition(BodyPart.INLINE);
              mpMixedAlternative.addBodyPart(calendarPart);
  
              addAttachment(multipart);
              // Put the multipart in message
              message.setContent(multipart);
  
              // send the message
              Transport transport = getMailSession().getTransport("smtp");
              transport.connect();
  
  
              transport.sendMessage(message, message.getAllRecipients());
  
              transport.close();
              UID = invitation.getTo() + "" + invitation.getStartdate().toString() + "" + invitation.getStarttime();
          } catch (Exception e) {
              //TODO logger log exception
          }
          return UID;
      }
  
      private void addAttachment(Multipart multipart) {
  
          MimeBodyPart mbpAttachment = new MimeBodyPart();
  
          File file=new File("C:/users/ishan.juneja/Desktop/temp.txt");
          DataSource datasource=new FileDataSource(file);
          try {
              mbpAttachment.setDataHandler(new DataHandler(datasource));
              mbpAttachment.setDisposition(BodyPart.ATTACHMENT);
  
              mbpAttachment.setFileName("temp.txt");
              multipart.addBodyPart(mbpAttachment);
          } catch (MessagingException e) {
              // TODO logger log exception
          }
  
  
      }
  
      public String uploadImage(MultipartFile file){
  
          byte[] bytes;
          try {
              String path = System.getProperty("catalina.home");
              File dir = new File(path+"/tmpFiles");
              if(!dir.isDirectory()){
                  dir.mkdir();
                  }
              bytes = file.getBytes();
              File serverfile = new File(dir.getAbsolutePath()+"/"+file.getName()+Math.random()+".png");
              BufferedOutputStream stream = new BufferedOutputStream(new FileOutputStream(serverfile));
              stream.write(bytes);
              stream.close();
  
              System.out.println("file uploaded "+serverfile.getAbsolutePath());
  
              String hostname="Unknown";
              try {
                  hostname = InetAddress.getLocalHost().getHostName();
              } catch (UnknownHostException e1) {
                  e1.printStackTrace();
              }
  
  
              return "{\"location\" : \"http://"+hostname+":8080/emailinvitation/image/path/"+serverfile.getName()+"\"}";
  
          } catch (IOException e) {
          }
  
          return "{\"location\":\"http://localhost:8080/emailinvitation/image/path/unknown.png\"}";
      }
  
      private Multipart newChild(Multipart parent, String alternative) {
          MimeMultipart child = new MimeMultipart(alternative);
          MimeBodyPart mbp = new MimeBodyPart();
          try {
              parent.addBodyPart(mbp);
              mbp.setContent(child);
          } catch (MessagingException e) {
              // TODO logger log exception
          }
  
          return child;
      }
  
      private BodyPart buildCalendarPart(Invitation invitation, String methodType) throws Exception {
  
          Date date1 = dateParser.parse(dateFormater.format(invitation.getStartdate()) + " " + invitation.getStarttime());
          String startDate = timeZoneToUTC(invitation, date1);
  
          Date date2 = dateParser.parse(dateFormater.format(invitation.getEnddate()) + " " + invitation.getEndtime());
          String endDate = timeZoneToUTC(invitation, date2);
  
          BodyPart calendarPart = new MimeBodyPart();
  
  
          String calendarContent = "BEGIN:VCALENDAR\n" + "METHOD:" + methodType + "\n" + "PRODID: BCP - Meeting\n"
                  + "VERSION:2.0\n" + "X-WR-TIMEZONE:" + invitation.getTimezone() + "\n" + "BEGIN:VEVENT\n" + "DTSTAMP:"
                  + startDate + "Z\n" + "DTSTART:" + startDate + "Z\n" + "DTEND:" + endDate + "Z\n"
                  + "SUMMARY:test request\n" + "UID:" + invitation.getTo() + "" + startDate + "\n"
                  + "ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=FALSE:MAILTO:" + invitation.getTo() + "\n"
                  + "ORGANIZER:MAILTO:" + senderAddress + "\n" + "LOCATION:Test\n"  + "SEQUENCE:0\n"
                  + "PRIORITY:5\n" + "CLASS:PUBLIC\n" + "STATUS:CONFIRMED\n" + "TRANSP:OPAQUE\n" + "BEGIN:VALARM\n"
                  + "ACTION:DISPLAY\n" + "DESCRIPTION:REMINDER\n" + "TRIGGER;RELATED=START:-PT00H15M00S\n"
                  + "END:VALARM\n" + "END:VEVENT\n" + "END:VCALENDAR";
  
          calendarPart.addHeader("Content-Class", "urn:content-classes:calendarmessage");
          calendarPart.setContent(calendarContent, "text/calendar;method=" + methodType);
  
          return calendarPart;
      }
  
      private BodyPart buildHtmlTextPart(Invitation invitation) {
  
          MimeBodyPart descriptionPart = new MimeBodyPart();
          String content = invitation.getDescription();
          try {
              descriptionPart.setContent(content, "text/html; charset=utf-8");
          } catch (MessagingException e) {
              // TODO logger log exception
  
          }
          return descriptionPart;
      }
  
      private void addImages(Multipart parent,String filename)  {
  
          MimeBodyPart mbpAttachment = new MimeBodyPart();
  
          try {
  
              File file = new File("C:\\apache-tomcat-8.5.24\\tmpFiles\\"+filename);
              FileDataSource ds = new FileDataSource(file);
              mbpAttachment.setDataHandler(new DataHandler(ds));
              mbpAttachment.setDisposition(BodyPart.INLINE);
              mbpAttachment.setHeader("Content-ID", filename);
              mbpAttachment.setFileName(filename);
              parent.addBodyPart(mbpAttachment);
          } catch (Exception e) {
              //TODO logger log exception
  
          }
  
  
      }
  
      private String timeZoneToUTC(Invitation invitation, Date date) {
          ZoneId zone = ZoneId.of(invitation.getTimezone());
  
          String date1 = dateParser.format(date);
  
          DateTimeFormatter fmt = DateTimeFormatter.ofPattern("dd-MM-yyyy HH:mm").withZone(zone);
  
          ZonedDateTime utc = ZonedDateTime.parse(date1, fmt).withZoneSameInstant(ZoneId.of("UTC"));
  
          Timestamp sqlTs = Timestamp.valueOf(utc.toLocalDateTime());
  
          return dateFormat.format(sqlTs);
      }
  
      public String getHtmlWithEncodedImages(Multipart parent,Invitation invitation) {
  
          String temp = invitation.getDescription();
          String html="<html><body>"+invitation.getDescription()+"</body></html>";
          Document document = Jsoup.parse(html);
          Elements allElements=document.body().getElementsByTag("img");
          for (Element element : allElements) {
              String elementstring=element.toString();
              String tempfilename = elementstring.substring(elementstring.indexOf("file"));
              String filename=tempfilename.substring(0,tempfilename.indexOf('"'));
              temp=temp.replace(elementstring.substring(elementstring.indexOf('"'), elementstring.lastIndexOf('"')),"\"cid:"+filename);
  
              addImages(parent, filename);
          }
          System.out.println("--++--"+temp);
          return temp;
      }
  

  回复于 2024-05-16T21:36:47+08:00