以下 Java 代码用于将文件附加到电子邮件。我想发送multiple通过电子邮件归档附件。任何建议，将不胜感激。
public class SendMail {
public SendMail() throws MessagingException {
String host = "smtp.gmail.com";
String Password = "mnmnn";
String from = "[email protected]";
String toAddress = "[email protected]";
String filename = "C:/Users/hp/Desktop/Write.txt";
// Get system properties
Properties props = System.getProperties();
props.put("mail.smtp.host", host);
props.put("mail.smtps.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
Session session = Session.getInstance(props, null);
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress(from));
message.setRecipients(Message.RecipientType.TO, toAddress);
message.setSubject("JavaMail Attachment");
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setText("Here's the file");
Multipart multipart = new MimeMultipart();
multipart.addBodyPart(messageBodyPart);
messageBodyPart = new MimeBodyPart();
DataSource source = new FileDataSource(filename);
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(filename);
multipart.addBodyPart(messageBodyPart);
message.setContent(multipart);
try {
Transport tr = session.getTransport("smtps");
tr.connect(host, from, Password);
tr.sendMessage(message, message.getAllRecipients());
System.out.println("Mail Sent Successfully");
tr.close();
} catch (SendFailedException sfe) {
System.out.println(sfe);
}
}
}`
好吧，自从我完成 JavaMail 工作以来已经有一段时间了，但看起来您可以多次重复此代码：
DataSource source = new FileDataSource(filename);
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(filename);
multipart.addBodyPart(messageBodyPart);
例如，您可以编写一个方法来执行此操作：
private static void addAttachment(Multipart multipart, String filename)
{
DataSource source = new FileDataSource(filename);
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(filename);
multipart.addBodyPart(messageBodyPart);
}
然后从您的主代码中，只需调用：
addAttachment(multipart, "file1.txt");
addAttachment(multipart, "file2.txt");
etc
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