Question

我正在尝试创建一个可以处理附件的简单javamail应用程序，但每当我发送电子邮件时它都会显示“java.io.FileNotFoundException：fileName”。上传我已经验证的文件没有问题，但它无法提取上传文件的绝对路径。我使用html表单发送多部分表单数据。以下是我的java代码：

将帖子MailApp.java：

@WebServlet("/EmailSendingServlet")
@MultipartConfig(fileSizeThreshold=58576, maxFileSize=20848820, maxRequestSize=418018841)

public class MailApp extends HttpServlet {
private String host;
private String port;

private static final String SAVE_DIR = "uploadFiles";

public void init() {
    host = "smtp.gmail.com";
    port = "587";    }

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String recipient = null;
    String subject = null;
    String content = null;
    String user = null;
    String pass = null;
    String fileName = null;

 // gets absolute path of the web application
    String appPath = request.getServletContext().getRealPath("");
    // constructs path of the directory to save uploaded file
    String savePath = appPath + File.separator + SAVE_DIR;

    // creates the save directory if it does not exists
    File fileSaveDir = new File(savePath);
    if (!fileSaveDir.exists()) {
        fileSaveDir.mkdir();
    }

    for( Part p : request.getParts() ) {
        if( "uploaded_file".equals(p.getName()) ) {
             fileName = extractFileName(p);
            // refines the fileName in case it is an absolute path
            fileName = new File(fileName).getName();
            p.write(savePath + File.separator + fileName);
        }
       else if( "recipient".equals(p.getName()) ) {recipient = request.getParameter("recipient");}
       else if( "subject".equals(p.getName()) ) {subject = request.getParameter("subject");}
        if( "content".equals(p.getName()) ) {content = request.getParameter("content");}
       else if( "user".equals(p.getName()) ) {user = request.getParameter("user");}
       else if( "pass".equals(p.getName()) ) {pass =request.getParameter("pass");}

    }
String resultMessage = "";


    try {            
        SendMail.sendEmail(host, port, user, pass, recipient, subject, content, fileName);
        resultMessage = "The e-mail was sent successfully";
    } catch (Exception ex) {
        ex.printStackTrace();
        resultMessage = "There were an error: " + ex.getMessage();
    } 
    finally {
        request.setAttribute("Message", resultMessage);
        getServletContext().getRequestDispatcher("/iml.jsp").forward(
                request, response);
    }
}
private String extractFileName(Part part) {
    String contentDisp = part.getHeader("content-disposition");
    String[] items = contentDisp.split(";");
    for (String s : items) {
        if (s.trim().startsWith("filename")) {
            return s.substring(s.indexOf("=") + 2, s.length()-1);
        }
    }
    return "";
}}

SendMail.java：

public class SendMail 
{ 
   public static void sendEmail(String host, String port,
            final String userName, final String password, String toAddress,
            String subject, String message,String fileName) throws AddressException,
            MessagingException {


        // sets SMTP server properties
        Properties properties = new Properties();
        properties.put("mail.smtp.host", host);
        properties.put("mail.smtp.port", port);
        properties.put("mail.smtp.auth", "true");
        properties.put("mail.smtp.starttls.enable", "true");

        // creates a new session with an authenticator
        Authenticator auth = new Authenticator() {
            public PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(userName, password);
            }
        };

        Session session = Session.getInstance(properties, auth);

        // creates a new e-mail message
        Message msg = new MimeMessage(session);

        msg.setFrom(new InternetAddress(userName));
        InternetAddress[] toAddresses = { new InternetAddress(toAddress) };
        msg.setRecipients(Message.RecipientType.TO, toAddresses);
        msg.setSubject(subject);
        msg.setSentDate(new Date());

        MimeBodyPart messageBodyPart = new MimeBodyPart();
        messageBodyPart.setContent(message, "text/html");

        // creates multi-part
        Multipart multipart = new MimeMultipart();
        DataSource source = new FileDataSource(fileName);
        messageBodyPart.setDataHandler(new DataHandler(source));
        messageBodyPart.setFileName(fileName);
        multipart.addBodyPart(messageBodyPart);


        // sets the multi-part as e-mail's content
        msg.setContent(multipart);

   try{     // sends the e-mail
        Transport.send(msg);
   }
   catch (Exception ex) {
       ex.printStackTrace();
   }
}
}

请帮我解决它

Answer 1

您需要创建一个目录来保存上传的文件
您需要为文件
您需要使用以下方法将上传到您保存的文件的文件写入：
```
filePart.write(FULL_FILE_PATH);
```
您可以关注this链接

Answer 2

好，我在这里错了...... 保存（写作）时你正在做

p.write(savePath + File.separator + fileName);

但是在调用“sendEmail”时，您只发送“fileName”，不应该是“savePath + File.separator + fileName”吗？

无法在JavaMail App中找到上载文件的绝对路径

2 个答案: