commons-fileupload和Liferay带来的麻烦

Question

我正在尝试定制Liferay Web Form portlet以接受文件上传，除了将文件附加到要发送的电子邮件之外，我已经完成了几乎所有的工作。

从表单中获取字段：

public void saveData(ActionRequest actionRequest, ActionResponse actionResponse) {

...

File uploadedFile = null;

...

Map<String,String> fieldsMap = new LinkedHashMap<String,String>();

// Create a FileItemFactory for disk-based file items
DiskFileItemFactory factory = new DiskFileItemFactory(1073741824, new File("/temp"));

// Create a new file upload handler
PortletFileUpload upload = new PortletFileUpload(factory);
upload.setSizeMax(67108864);

// Parse the request
List<FileItem> items = upload.parseRequest(actionRequest); 

int i = 1;

Iterator iter = items.iterator();

// Throw away the hidden field, don't need it
FileItem dud = (FileItem)iter.next();

while (iter.hasNext()) {

    FileItem item = (FileItem)iter.next();

    String fieldLabel = preferences.getValue(
        "fieldLabel" + i, StringPool.BLANK);

    String fieldType = preferences.getValue(
            "fieldType" + i, StringPool.BLANK);

    if (Validator.isNull(fieldLabel)) {
        break;
    }

    if(!fieldType.equals("file")) {
        String fieldValue = item.getString();
        fieldsMap.put(fieldLabel, fieldValue);
    } else {
        String fieldName = item.getName();
        uploadedFile = new File(fieldName);
        item.write(uploadedFile);
    }
        i++;
}
...

     if(sendAsEmail) {
         emailSuccess = sendEmail(fieldsMap, preferences, uploadedFile);
     }
}

然后是邮件的构造和发送：

protected boolean sendEmail(Map<String, String> fieldsMap, PortletPreferences preferences, File uploadedFile) {

    MailMessage mailMessage = new MailMessage(fromAddress, toAddress, subject, body, false);

    if(uploadedFile != null) { // i.e., there was 'file' field up above
        mailMessage.addAttachment(uploadedFile);
    }

    MailServiceUtil.sendEmail(mailMessage);


    if(uploadedFile != null) {
       uploadedFile.delete();
    }

}

尝试处理文件上传并将文件附加到消息时，我收到以下控制台错误：

16:09:49,597 ERROR [MailEngine:489] IOException while sending message
16:09:49,598 ERROR [MailEngine:154] java.io.FileNotFoundException: helpdesk_.png (No such file or directory)

我的DiskFileItemFactory配置是否正确？我能做错什么呢？

谢谢。

Answer 1

看起来MailServiceUtil子系统派生了一个线程来执行电子邮件的实际发送，而不是等待它返回(因此称为线程)。因此，在调用MailServiceUtil.sendEmail()之后，我立即删除了要附加的文件，然后才真正有机会发送它！

我将研究某种类型的MailServiceUtil包装器，我可以将文件对象传递给它，然后一旦它实际发送，就执行删除操作。

Answer 2

您可以尝试使用MailEngine.send方法吗

send( InternetAddress from，InternetAddress[] to，InternetAddress[] cc，InternetAddress[] bcc，InternetAddress[] bulkAddresses，String subject，String body，boolean htmlFormat，InternetAddress[] replyTo，String messageId，String inReplyTo，File[] attachments)

即使你解决了这个问题，我也不确定MailEngineUtil.sendEmail是否会工作，因为你已经发现它会发送到总线上，然后一个监听器会被调用(我想是它的MailMessageListener)，即使你把它添加到mailMessage中，它也不会读取attachement。