java JavaFx在邮件中以附件形式发送临时excel文件

Question

我想在邮件中将excel文件作为附件发送
当我使用物理文件时，一切都很好，但当我将其用作临时文件时，我得到了这个例外

javax.mail.MessagingException: IOException while sending message;        
java.io.FileNotFoundException: 2019-03-02.xls (Le fichier spécifié est introuvable)

创建临时文件时，使用以下代码：

//....
    try {//create temp file here
            file = File.createTempFile(today,".xlsx");
        } catch (IOException ex) {
            Logger.getLogger(Writer.class.getName()).log(Level.SEVERE, null, ex);
        }
            try (FileOutputStream fileOut = new FileOutputStream(file)) {
                workbook.write(fileOut);
//.....

但当我使用像这样的普通文件时，效果非常好：

try (FileOutputStream fileOut = new FileOutputStream(today+".xlsx")) {
            workbook.write(fileOut);

有什么解决办法吗

或者对如何在不保存的情况下发送excel文件有何建议

编辑：这里是完全例外

javax.mail.MessagingException: IOException while sending message;
  nested exception is:
    java.io.FileNotFoundException: 2019-03-02.xls (Le fichier spécifié est introuvable)
    at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:625)
    at rapport.rapportc.sendMail(rapportc.java:113)
    at rapport.rapportc.envoyer(rapportc.java:60)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
    at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
    at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
    at javafx.event.Event.fireEvent(Event.java:198)
    at javafx.scene.Node.fireEvent(Node.java:8413)
    at javafx.scene.control.Button.fire(Button.java:185)
    at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
    at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
    at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
    at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
    at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
    at javafx.event.Event.fireEvent(Event.java:198)
    at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
    at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
    at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
    at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:381)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:417)
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416)
    at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
    at com.sun.glass.ui.View.notifyMouse(View.java:937)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.FileNotFoundException: 2019-03-02.xls (Le fichier spécifié est introuvable)
    at java.io.FileInputStream.open0(Native Method)
    at java.io.FileInputStream.open(FileInputStream.java:195)
    at java.io.FileInputStream.<init>(FileInputStream.java:138)
    at javax.activation.FileDataSource.getInputStream(FileDataSource.java:97)
    at javax.activation.DataHandler.writeTo(DataHandler.java:305)
    at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1350)
    at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:845)
    at javax.mail.internet.MimeMultipart.writeTo(MimeMultipart.java:361)
    at com.sun.mail.handlers.multipart_mixed.writeTo(multipart_mixed.java:85)
    at javax.activation.ObjectDataContentHandler.writeTo(DataHandler.java:889)
    at javax.activation.DataHandler.writeTo(DataHandler.java:317)
    at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1350)
    at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1683)
    at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:585)
    ... 60 more

EDIT2:这是我用来发送带有附件的电子邮件的功能

private void sendMail(){

        try{
        String host ="smtp.gmail.com" ;
        String user = "send@gmail.com";
        String pass = "pwd";
        String to = "recieve@gmail.com";
        String from = "send@gmail.com";
        String subject = "sending day : "+today; // today is a string variable for today's date
        String messageText = "msg";
        boolean sessionDebug = false;

        Properties props = System.getProperties();

        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.port", "587");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.required", "true");

        java.security.Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
        Session mailSession = Session.getDefaultInstance(props, null);
        mailSession.setDebug(sessionDebug);
        Message msg = new MimeMessage(mailSession);
        msg.setFrom(new InternetAddress(from));
        InternetAddress[] address = {new InternetAddress(to)};
        msg.setRecipients(Message.RecipientType.TO, address);
        msg.setSubject(subject); msg.setSentDate(new Date());
        msg.setText(messageText);
        Multipart emailContent = new MimeMultipart();
        MimeBodyPart textBodyPart = new MimeBodyPart();
        textBodyPart.setText("");
        MimeBodyPart excelAttach = new MimeBodyPart();
        String path = today+".xls"; // here where i put the excel file to be send
        excelAttach.attachFile(path);
        emailContent.addBodyPart(textBodyPart);
        emailContent.addBodyPart(excelAttach);
        msg.setContent(emailContent);

        Transport transport=mailSession.getTransport("smtp");
        transport.connect(host, user, pass);
        transport.sendMessage(msg, msg.getAllRecipients());
        transport.close();
        System.out.println("message send successfully");

    }catch(IOException | MessagingException ex)
    {
        alert.alert.showErrorMessage(ex);
        return;
    }
}

Ps:当我发送物理文件时，一切正常

我想发送excel文件而不使用临时文件或其他方式保存它

Answer 1

如果更改此选项，您可以获得更详细的异常消息：

excelAttach.attachFile(path);

为此：

excelAttach.attachFile(new File(path).getAbsolutePath());

问题是您对文件的行为做出了两个错误的假设。创建临时文件

所有操作系统都使用一组随机字符创建临时文件，以确保该文件是唯一的。当您执行file = File.createTempFile(today, ".xlsx")操作时，不是创建名为2019-03-02.xls的文件，而是创建名为/tmp/2019-03-02jxl9BZ.xls的文件。因此，当您附加2019-03-02.xls时，您附加的是一个不存在的文件，这就是异常告诉您的

第二个问题是您正在传递一个相对文件名相对文件名总是相对于Java进程的当前目录进行解析。这意味着2019-03-02.xls与/home/vgr/2019-03-02.xls相同，如果您恰好从/home/vgr目录运行。但临时文件从未在该位置创建，因此，再次尝试附加一个不存在的文件。（相对文件不是Java概念；几十年来，它们一直是操作系统的基本组成部分。）

解决方案是在字段中保留file（如果您还没有这样做），并将其传递给attachFile方法：

excelAttach.attachFile(file);