我想在向收件人發送電子郵件時包含附件。我已經能夠設置和獲取附件，但是當從 Javaxmail 調用 attachFile 方法時出現錯誤。此代碼是使用 javax 庫用 Java 編寫的。一切似乎都很好，但失敗了。我也嘗試過添加編碼，但結果相同。當調用 attachFile 方法時，此代碼失敗。attachPart.attachFile(f); // fails here...try {Message msg = new MimeMessage(propsSess);msg.setFrom(new InternetAddress(this.defaultSenderAddress));setRecipient(msg, this.sendTo, "to");msg.setSubject(this.subject);msg.setContent(this.bodyHtml, "text/html");msg.setHeader("X-Mailer", "Java Agent");msg.setSentDate(new Date());if (!this.bodyAttach.isEmpty()) {    BodyPart messageText = new MimeBodyPart();    messageText.setText(this.bodyHtml);    Multipart multipart = new MimeMultipart();    multipart.addBodyPart(messageText);    // adds attachments     for (int index = 0; index < this.bodyAttach.size(); index++) {        MimeBodyPart attachPart = new MimeBodyPart();        try {            System.out.println(this.bodyAttach.get(index)); // shows only 1st attachments            File f = new File(this.bodyAttach.get(index));            attachPart.attachFile(f); // fails here...        } catch (IOException ex) {            ex.printStackTrace();        }        multipart.addBodyPart(attachPart);    }    // sets the multi-part as e-mail's content    msg.setContent(multipart);}SMTPTransport transport = (SMTPTransport) propsSess.getTransport("smtp");transport.connect(this.smtpServerAddress, null, null);if (transport.isConnected()) {    transport.sendMessage(msg, msg.getAllRecipients());    transport.close();    this.processMessage.add("success");}} catch (Exception e) {this.processMessage.add(databaseTitle + ": SmtpMail bean: Message or SMTPTransport error");return false;}