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我发送不带附件的电子邮件的代码工作正常。但是当我尝试发送带有附件的电子邮件时，我收到一条错误消息

'C:\Temp\test.txt（系统找不到指定的文件）'代码如下：' 

  package com.abe.test;
    import java.util.Properties;
    import javax.mail.*;
    import javax.activation.*;
    import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;


public class TestJavaMail {

    /**
     * @param args
     */

    public static void main(String[] args) {

        final String username = "from@gmail.com";
        final String password = "xxxx";

        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("from@gmail.com"));
            message.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse("to@gmail.com"));
            message.setSubject("Testing Subject 1");
            message.setText("PFA");
            MimeBodyPart messageBodyPart = new MimeBodyPart();

            Multipart multipart = new MimeMultipart();

            messageBodyPart = new MimeBodyPart();

            String file = "C:\\Temp";
            String fileName = "test.txt";
            DataSource source = new FileDataSource(file);

            messageBodyPart.setDataHandler(new DataHandler(source));
            messageBodyPart.setFileName(fileName);
            multipart.addBodyPart(messageBodyPart);

            message.setContent(multipart);

            System.out.println("Sending");

            Transport.send(message);

            System.out.println("Done");

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

我是否需要设置任何 ClassPATH 或其他任何东西才能使文件附件正常工作？

谢谢

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