Java用附件中的文件發送電子郵件

Question

我想用java發送附件中的文件。 我有兩個類，其中一個指定文件位置，第二個類用作工具類發送電子郵件 因此，當我執行第一個類時，它不會發送電子郵件。

第一類：

public class SendFile { 
    private static String[] args; 

    public static void sendEmail(File filetosend) throws IOException, Exception{ 

    //public static void main(String[] args) throws IOException { 

    final String username = "email0@gmail.com"; 
    final String password = "password"; 

    Properties props = new Properties(); 
    props.put("mail.smtp.auth", true); 
    props.put("mail.smtp.starttls.enable", true); 
    props.put("mail.smtp.host", "smtp.gmail.com"); 
    props.put("mail.smtp.port", "587"); 

    Session session = Session.getInstance(props, 
      new javax.mail.Authenticator() { 
       protected PasswordAuthentication getPasswordAuthentication() { 
        return new PasswordAuthentication(username, password); 
       } 
      }); 

    try { 

     Message message = new MimeMessage(session); 
     message.setFrom(new InternetAddress("email0@gmail.com")); 
     message.setRecipients(Message.RecipientType.TO, 
       InternetAddress.parse("email0@gmail.com")); 
     message.setSubject("Attach file Test from Netbeans"); 
     message.setText("PFA"); 

     MimeBodyPart messageBodyPart = new MimeBodyPart(); 

     Multipart multipart = new MimeMultipart(); 

     messageBodyPart = new MimeBodyPart(); 

     //String filetosend = ("c:\\file.txt"); 

     DataSource source = new FileDataSource(filetosend); 
     System.out.println("The filetosend is ="+filetosend); 

     messageBodyPart.setDataHandler(new DataHandler(source)); 
     System.out.println("The source is ="+source); 

     messageBodyPart.attachFile(filetosend); 
     System.out.println("The file name is ="+messageBodyPart.getFileName()); 

     multipart.addBodyPart(messageBodyPart); 
     System.out.println("The message body part is ="+messageBodyPart); 

     message.setContent(multipart); 
     System.out.println("The message multi part is ="+multipart); 


     System.out.println("Sending"); 

     Transport.send(message); 
     System.out.println("The message is ="+message); 

     System.out.println("Done"); 

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

而第二類：

import java.io.File; 
import java.io.IOException; 

public class Test { 

    public static void main(String[] args) throws Exception { 

    } 
    File file; 
    public void Test() throws IOException, Exception{ 
     System.out.println("Sending the file..."); 
     File filetosend = new File("c:\\file.txt"); 
     SendFile.sendEmail(filetosend); 
    } 
} 

沒有錯誤，但沒有發送的文件。 請任何幫助，謝謝

Answer 1

您的代碼是錯誤的。如果你從某個地方複製它，原件也是錯的，或者你錯了。這是你想要什麼：

Message message = new MimeMessage(session); 
    message.setFrom(new InternetAddress("email0@gmail.com")); 
    message.setRecipients(Message.RecipientType.TO, 
      InternetAddress.parse("email0@gmail.com")); 
    message.setSubject("Attach file Test from Netbeans"); 

    MimeBodyPart messageBodyPart = new MimeBodyPart(); 
    messageBodyPart.setText("PFA"); 

    attachmentBodyPart = new MimeBodyPart(); 

    System.out.println("The filetosend is ="+filetosend); 
    System.out.println("The source is ="+source); 

    attachmentBodyPart.attachFile(filetosend); 
    System.out.println("The file name is ="+attachmentBodyPart.getFileName()); 

    Multipart multipart = new MimeMultipart(); 
    multipart.addBodyPart(messageBodyPart); 
    multipart.addBodyPart(attachmentBodyPart); 

    message.setContent(multipart); 
    System.out.println("The message multi part is ="+multipart); 

    System.out.println("Sending"); 

    Transport.send(message); 

Answer 2

你的代碼看起來不錯。實際上，我幾乎使用完全相同的代碼來發送帶有附件的消息。您應該查看是否需要向Transport添加身份驗證，並使用主機，端口，身份驗證ID和身份驗證傳遞進行連接。另外，請檢查是否有防火牆阻止帶附件的消息（令人難以置信的常見問題）。

如果你看看這個帖子Stack Overflow post on sending multiple attachments

你會看到，幾乎同樣的事情做，它給出瞭如何與驗證發送消息的例子。