避免在 java 邮件 API 中封装邮件

Question

我编写了代码来检查邮件获取收件人计算他们的长度，并根据该计算将邮件转发到相同的 id，一切正常，但我的邮件作为附件转发。我不想要那个。我要转发简单的邮件。

不足之处请指教

public class CheckingMail {

  public static void main(String[] args) {

    String host = "mycompanyname.com";
       String mailStoreType = "pop3";
       String username = "myemailid.com"; 
       String password = "mypassword";
       check(host, mailStoreType, username, password);
  }

 public static void check(String host, String mailStoreType,String username, String password) {

  try {
     System.out.println("\n\n1 creating the properties field");
   //create properties field
        Properties properties = new Properties();
        properties.put("mail.pop3.host", host);   //The POP3 server to connect to.
        properties.put("mail.pop3.port", "995");
        properties.put("mail.pop3.starttls.enable", "true");

         // Get a Session
             Session emailSession = Session.getInstance(properties);
        System.out.println("\n\n2 Get a Session="+emailSession);
        System.out.println("\n\n3 create the POP3 store object and connect with the pop server");
      //create the POP3 store object and connect with the pop server
        Store store = emailSession.getStore("pop3s");
       // Store store = emailSession.getStore(mailStoreType);
        store.connect(host,username,password);
        System.out.println("\n\n4create the folder object and open it");
      //create the folder object and open it
        Folder emailFolder = store.getFolder("INBOX");
        emailFolder.open(Folder.READ_ONLY);
        System.out.println("\n\n5 retrieve the messages from the folder in an array and print it");
     // retrieve the messages from the folder in an array and print it
        Message[] messages = emailFolder.getMessages();
        System.out.println("messages.length---" + messages.length);
        System.out.println("\n before for loop");
        for (int i = 0, n = messages.length; i < n; i++) {
           Message message = messages[i];
           // MimeMessage message = new MimeMessage(emailSession);
            System.out.println("---------------------------------");
            System.out.println("Email Number =" + (i + 1));
            //System.out.println("To Recipients =" +  message.getRecipients(Message.RecipientType.TO));
            System.out.println("Subject = " + message.getSubject());
            System.out.println("From =" + message.getFrom()[0]);
           // System.out.println("Text =" + message.getContent().toString());
         /*=====================  To and CC starts here ===============================*/
            Address[] address;
               StringBuffer msg_buffer_to = new StringBuffer(50);
     // TO
     if ((address = message.getRecipients(Message.RecipientType.TO)) != null) {
      for (int j = 0; j < address.length; j++) {
       msg_buffer_to.append(address[j]);

       System.out.println("\t\t\tTO " + address[j]);


      }

     }
     StringBuffer msg_buffer_cc = new StringBuffer(50);
     // CC
     if ((address = message.getRecipients(Message.RecipientType.CC)) != null) {
      for (int j = 0; j < address.length; j++) {
       msg_buffer_cc.append(address[j]);

       System.out.println("\t\t\tCC " + address[j]);

      }

     }

     //counting the length here for both To and CC...


    System.out.println("\n\n\t total length is== "+(msg_buffer_to.length()+msg_buffer_cc.length())+"\n\n");

    /*************************************Merging of forward class***********************************************************/

     if((msg_buffer_to.length()+msg_buffer_cc.length())>100)
     {
      System.out.println("\n\t Address length crossed the limits\t\n");
      //forward mailing starts here 

     // Properties properties = new Properties();
        properties.put("mail.store.protocol", "pop3");
           properties.put("mail.pop3s.host", "mycompanyname.com");
           properties.put("mail.pop3s.port", "995");
           properties.put("mail.pop3.starttls.enable", "true");
           properties.put("mail.smtp.auth", "true"); 
           properties.put("smtp.starttls.enable", "true");
           properties.put("mail.smtp.host", "mycompanyname.com");
           properties.put("mail.smtp.port", "25");

               Session session = Session.getInstance(properties,new javax.mail.Authenticator() {  
           protected PasswordAuthentication getPasswordAuthentication() {  
               return new PasswordAuthentication("mymailid.com","mypassword");  
           }  
         });
      try{
       // session.setDebug(true);
             // Get a Store object and connect to the current host

             // Create a Folder object and open the folder
             Folder folder = store.getFolder("inbox");
             folder.open(Folder.READ_ONLY);

             if (messages.length != 0) {


                // Get all the mail ids from the message

                String from = InternetAddress.toString(message.getRecipients(Message.RecipientType.TO));
                if (from != null) {
                    System.out.println("From:"  + from);
                }

                String to = InternetAddress.toString(message.getRecipients(Message.RecipientType.TO));
                if (to != null) {
                   System.out.println("To: " + to);             
                }
                String subject = message.getSubject();
                if (subject != null) {
                   System.out.println("Subject: " + subject);
                }

                   Message forward = new MimeMessage(session);
                   // Fill in header

                   forward.setRecipients(Message.RecipientType.TO,InternetAddress.parse("mymailid.com"));
                   forward.setSubject("Fwd: " + message.getSubject());

                   forward.addFrom(InternetAddress.parse(from));
                   forward.setFrom(new InternetAddress("mymailid.com"));      

                   // Create the message part
                   MimeBodyPart messageBodyPart = new MimeBodyPart();
                   // Create a multipart message
                   Multipart multipart = new MimeMultipart();
                   // set content
                   messageBodyPart.setContent(message, "message/rfc822");
                   // Add part to multi part
                   multipart.addBodyPart(messageBodyPart);
                   // Associate multi-part with message
                   forward.setContent(multipart);
                   forward.saveChanges();
                   Transport.send(forward);
                   // Send the message by authenticating the SMTP server
                   // Create a Transport instance and call the sendMessage
                   System.out.println("message forwarded successfully....");
              //  }          // end if
          //  }


      }// end if

         catch(Exception e) {
           e.printStackTrace();  
     }

     }

         }

      //close the store and folder objects
        System.out.println("\n\n6 close the store and folder objects");    
        emailFolder.close(false);
        store.close();
        } catch (MessagingException e){
           e.printStackTrace();
        } catch (Exception e){
           e.printStackTrace();
        }
 }
 }![enter image description here](https://i.stack.imgur.com/EPe3t.jpg)

Answer 1

抱歉，我来晚了发布完整的解决方案，用于根据字符长度转发邮件作为文本邮件而不是附加邮件。将此视为已接受的答案。希望能达到目的。

public class CheckingMail {
     public static void main(String[] args) {
           String host = "mycompanyname.com";
           String mailStoreType = "pop3";
           String username = "myemailid.com"; 
           String password = "mypassword";
           check(host, mailStoreType, username, password);
      }

    public static void check(String host, String mailStoreType,String username, String password) {
    try {
         System.out.println("\n\n1 creating the properties field");
            Properties properties = new Properties();
            properties.put("mail.pop3.host", host);   //The POP3 server to connect to.
            properties.put("mail.pop3.port", "995");
            properties.put("mail.pop3.starttls.enable", "true");

            Session emailSession = Session.getInstance(properties);
            System.out.println("\n\n2 Get a Session="+emailSession);
            System.out.println("\n\n3 create the POP3 store object and connect with the pop server");

            Store store = emailSession.getStore("pop3s");
            store.connect(host,username,password);
            System.out.println("\n\n4create the folder object and open it");
            Folder emailFolder = store.getFolder("INBOX");
            emailFolder.open(Folder.READ_ONLY);
            System.out.println("\n\n5 retrieve the messages from the folder in an array and print it");
            Message[] messages = emailFolder.getMessages();
            System.out.println("messages.length---" + messages.length);
            System.out.println("\n before for loop");
            for (int i = 0, n = messages.length; i < n; i++) {
               Message message = messages[i];
               System.out.println("Email Number =" + (i + 1));
               System.out.println("Subject = " + message.getSubject());
               System.out.println("From =" + message.getFrom()[0]);
               Address[] address;
               StringBuffer msg_buffer_to = new StringBuffer(50);

         if ((address = message.getRecipients(Message.RecipientType.TO)) != null) {
          for (int j = 0; j < address.length; j++) {
           msg_buffer_to.append(address[j]);
           System.out.println("\t\t\tTO " + address[j]);
          }
         }
         StringBuffer msg_buffer_cc = new StringBuffer(50);
         if ((address = message.getRecipients(Message.RecipientType.CC)) != null) {
          for (int j = 0; j < address.length; j++) {
           msg_buffer_cc.append(address[j]);
           System.out.println("\t\t\tCC " + address[j]);
          }
         }
        System.out.println("\n\n\t total length is== "+(msg_buffer_to.length()+msg_buffer_cc.length())+"\n\n");

         if((msg_buffer_to.length()+msg_buffer_cc.length())>100)
         {
          System.out.println("\n\t Address length crossed the limits\t\n");
               properties.put("mail.store.protocol", "pop3");
               properties.put("mail.pop3s.host", "mycompanyname.com");
               properties.put("mail.pop3s.port", "995");
               properties.put("mail.pop3.starttls.enable", "true");
               properties.put("mail.smtp.auth", "true"); 
               properties.put("smtp.starttls.enable", "true");
               properties.put("mail.smtp.host", "mycompanyname.com");
               properties.put("mail.smtp.port", "25");
              Session session = Session.getInstance(properties,new javax.mail.Authenticator() {  
               protected PasswordAuthentication getPasswordAuthentication() {  
                   return new PasswordAuthentication("mymailid.com","mypassword");  
               }  
             });
           try{
                 Folder folder = store.getFolder("inbox");
                 folder.open(Folder.READ_ONLY);
                 if (messages.length != 0) {
                    String from = InternetAddress.toString(message.getRecipients(Message.RecipientType.TO));
                    if (from != null) {
                        System.out.println("From:"  + from);
                    }

                    String to = InternetAddress.toString(message.getRecipients(Message.RecipientType.TO));
                    if (to != null) {
                       System.out.println("To: " + to);             
                    }
                    String subject = message.getSubject();
                    if (subject != null) {
                       System.out.println("Subject: " + subject);
                    }
                       Message forward = new MimeMessage(session);
                       forward.setRecipients(Message.RecipientType.TO,InternetAddress.parse("mymailid.com"));
                       forward.setSubject("Fwd: " + message.getSubject());
                       forward.addFrom(InternetAddress.parse(from));
                       forward.setFrom(new InternetAddress("mymailid.com"));      
                       MimeBodyPart messageBodyPart = new MimeBodyPart();
                       Multipart multipart = new MimeMultipart();
                       messageBodyPart.setContent(message.getContent(), "message/rfc822");
                       multipart.addBodyPart(messageBodyPart);
                       forward.setContent(multipart);
                       forward.saveChanges();
                       Transport.send(forward);
                       System.out.println("message forwarded successfully....");
                      }
             catch(Exception e) {
               e.printStackTrace();  
         }
         }
             }

            System.out.println("\n\n6 close the store and folder objects");    
            emailFolder.close(false);
            store.close();
            } catch (MessagingException e){
               e.printStackTrace();
            } catch (Exception e){
               e.printStackTrace();
            }
     }
     }

避免在 java 邮件 API 中封装邮件

Avoiding encapsulated mail in java mail API

java

email

jakarta-mail

email-attachments