在Java中將文件附加到電子郵件

Question

我想知道我在這里做錯了什么（我想念的是什么）。 我的電子郵件確實發送了，但是沒有附件。 我發送的文件簡稱為“ log”。 如您所見，我在這里嘗試了多種方法，我也一步一步地嘗試了它們，但是它們都不起作用：

            MimeMessage message = new MimeMessage(session);
            MimeBodyPart emailAttachment = new MimeBodyPart();
            Multipart multipart = new MimeMultipart();
            int len = build.getLogFile().getPath().length();
            //I have verified that "file" provides the right path
            String file = build.getLogFile().getPath().substring(0, (len-3));
            String fileName = "log";
            DataSource source = new FileDataSource(file);
            emailAttachment.setDataHandler(new DataHandler(source));
            //I know this .attachFile is not needed but I added it when nothing was working
            emailAttachment.attachFile(build.getLogFile());
            emailAttachment.setFileName(fileName);
            multipart.addBodyPart(emailAttachment);
            message.setContent(multipart);  
            message.setFrom(adminAddress);
            message.setText(builder.toString());
            message.setSentDate(new Date());


            mailSender.send(message);

謝謝

Answer 1

使用此代碼=>

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;

public class SendFileEmail
 {
 public static void main(String [] args)
{


  String to = "abcd@gmail.com";

  String from = "web@gmail.com";

  String host = "localhost";

  Properties properties = System.getProperties();

  properties.setProperty("mail.smtp.host", host);

  Session session = Session.getDefaultInstance(properties);

  try{

     MimeMessage message = new MimeMessage(session);

     message.setFrom(new InternetAddress(from));

     message.addRecipient(Message.RecipientType.TO,
                              new InternetAddress(to));

     message.setSubject("This is the Subject Line!");

     BodyPart messageBodyPart = new MimeBodyPart();

     messageBodyPart.setText("This is message body");

     Multipart multipart = new MimeMultipart();

     multipart.addBodyPart(messageBodyPart);

     messageBodyPart = new MimeBodyPart();
     String filename = "file.txt";
     DataSource source = new FileDataSource(filename);
     messageBodyPart.setDataHandler(new DataHandler(source));
     messageBodyPart.setFileName(filename);
     multipart.addBodyPart(messageBodyPart);


     message.setContent(multipart );


     Transport.send(message);
     System.out.println("Sent message successfully....");
  }catch (MessagingException mex) {
     mex.printStackTrace();
   }
}
}