Java用附件中的文件发送电子邮件

Question

我想用java发送附件中的文件。 我有两个类，其中一个指定文件位置，第二个类用作工具类发送电子邮件 因此，当我执行第一个类时，它不会发送电子邮件。

第一类：

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 = "[email protected]"; 
    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("[email protected]")); 
     message.setRecipients(Message.RecipientType.TO, 
       InternetAddress.parse("[email protected]")); 
     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(); 
    } 
    } 
} 

而第二类：

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); 
    } 
} 

没有错误，但没有发送的文件。 请任何帮助，谢谢

Answer 1

您的代码是错误的。如果你从某个地方复制它，原件也是错的，或者你错了。这是你想要什么：

Message message = new MimeMessage(session); 
    message.setFrom(new InternetAddress("[email protected]")); 
    message.setRecipients(Message.RecipientType.TO, 
      InternetAddress.parse("[email protected]")); 
    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

你的代码看起来不错。实际上，我几乎使用完全相同的代码来发送带有附件的消息。您应该查看是否需要向Transport添加身份验证，并使用主机，端口，身份验证ID和身份验证传递进行连接。另外，请检查是否有防火墙阻止带附件的消息（令人难以置信的常见问题）。

如果你看看这个帖子Stack Overflow post on sending multiple attachments

你会看到，几乎同样的事情做，它给出了如何与验证发送消息的例子。