上传一个文件，Spring MVC + CloudBees [英] Uploading a file, Spring MVC + CloudBees

问题描述

我曾经在Tomcat的本地服务器上工作过，现在我刚把应用程序部署到了CloudBees上。
除了将文件上传到服务器的目录之外，一切都很好。

我在控制器中有这样一段代码，

  @RequestMapping（/ main / admin / upload）
 public ModelAndView fileUploaded（
 @ModelAttribute （uploadedFile）FileUpload uploadedFile，
 final HttpServletRequest请求，
 final HttpServletResponse响应，BindingResult结果）{
 
 InputStream inputStream = null; 
 OutputStream outputStream = null; 
 String pdfDirectory = uploadedFile.getPdfDirectory（）; 
 MultipartFile file = uploadedFile.getFile（）; 
 String fileName = file.getOriginalFilename（）; 
 
尝试{
 inputStream = file.getInputStream（）; 
 
 String pdfFileDirectory = request.getSession（）.getServletContext（）
 .getRealPath（/）
 +resources\\pdf\\+ pdfDirectory +\\; 
文件newFile = new File（pdfFileDirectory + fileName）; 
 if（！newFile.exists（））{
 newFile.createNewFile（）; 
} 
 outputStream = new FileOutputStream（newFile）; 
 int read = 0; 
 byte [] bytes = new byte [1024]; （（read = inputStream.read（bytes））！= -1）{
 outputStream.write（bytes，0，read）; 
 
 while 
} 
} catch（IOException e）{
 e.printStackTrace（）; 
} 
 
返回新的ModelAndView（redirect：/ main / admin）; 
} 
  

我不确定这一行是否正常工作：

$ b $ $ p $ request.getSession（）。getServletContext（）。getRealPath（/）


我确定文件夹被创建，因为我已经在我的eclipse项目中手动添加了它们。我还在提取到CloudBees之前手动添加了一些文件到这些文件夹，这些文件是可以访问的，但是当我尝试使用上面的代码上传文件时，它不起作用。

b
$ b

重新部署/向外扩展的应用程序将从一个不同的节点开始，因此您不应该在那里存储文件。我们建议使用amazon S3（或相当的文件存储）进行存储，并使用本地（临时）文件系统作为临时缓存。

您可以使用系统。 getProperty（java.io.tempDir）获取配置的本地temp。

CloudBees还提供了两个不同的示例，可以帮助您将文件上传到亚马逊S3 - 你也可以使用Dropbox，Google Drive，..-。

• 蜜蜂商店ClickStart li>
  
• Amazon S3 ClickStart

更多信息 here 。

I have worked on local Tomcat's server and now I've just deployed my application to CloudBees. Everything works great apart from uploading a file to the server's directory.

I have such a piece of code in my controller, which worked for me on localhost:

@RequestMapping("/main/admin/upload")
public ModelAndView fileUploaded(
        @ModelAttribute("uploadedFile") FileUpload uploadedFile,
        final HttpServletRequest request,
        final HttpServletResponse response, BindingResult result) {

    InputStream inputStream = null;
    OutputStream outputStream = null;
    String pdfDirectory = uploadedFile.getPdfDirectory();
    MultipartFile file = uploadedFile.getFile();
    String fileName = file.getOriginalFilename();

    try {
        inputStream = file.getInputStream();

        String pdfFileDirectory = request.getSession().getServletContext()
                .getRealPath("/")
                + "resources\\pdf\\" + pdfDirectory + "\\";
        File newFile = new File(pdfFileDirectory + fileName);
        if (!newFile.exists()) {
            newFile.createNewFile();
        }
        outputStream = new FileOutputStream(newFile);
        int read = 0;
        byte[] bytes = new byte[1024];

        while ((read = inputStream.read(bytes)) != -1) {
            outputStream.write(bytes, 0, read);
        }
    } catch (IOException e) {
        e.printStackTrace();
    }

    return new ModelAndView("redirect:/main/admin");
}

I'm not sure if this line is working correctly:

request.getSession().getServletContext().getRealPath("/")

I'm sure folders are created, because I have added them manually in my eclipse project. I've also added manually some files to these folders before extracting to CloudBees and these files are accessible, but when I try to upload file using above code, it doesn't work.

解决方案

Filesystem is not persistent on the cloud, so it is NOT a good practice to upload files to the file system in the same way you on your hard disk.

Application being redeployed/scale-out will start on a distinct node, so you shouldn't store files there. We recommend to store using amazon S3 (or comparable file store) and use local ("ephemeral") filesystem as a temporary cache.

You can use System.getProperty("java.io.tempDir") to get the configured local temp.

CloudBees also provides two different examples which could help you to upload files to Amazon S3 -you can also use Dropbox, Google Drive,..-.

• Bees Shop ClickStart
• Amazon S3 ClickStart

More info here.

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