Java:在服务器上下文外部下载文件 [英] Java : download file outside server context

问题描述

我需要在服务器上下文外部的目录中保存文件并下载文件. 我正在使用Apache Tomacat 我可以在应用程序的webapps目录中存在的目录中执行此操作

I need to save a file and download file in directory outside server context. I am using Apache Tomacat I am able to do this in directory present in webapps directory of application

如果我的目录结构如下，

If my directory structure is as follows,

--src
--WebContent
    -- uploaddir
         -- myfile.txt

然后我就可以简单地下载了.

Then I am able to download in by simply.

      <a href="uploaddir/myfile.txt" target="_blank">download</a>

但是，问题是文件在其他目录中时说d:\\uploadedfile\\myfile.txt

But, problem is when file is in some other directory say d:\\uploadedfile\\myfile.txt

然后我将无法下载它，因为资源不在上述服务器上下文中.

then I wont be able to download it, as resource is not in server context as above.

我有uuid映射的文件路径， 喜欢，

I have file path to uuid mapping, like,

d:\\uploadedfiles\\myfile.txt <-> some_uuid

然后，我要下载文件，请点击以下链接

then I want file should be downloaded, on click of following,

   <a href="filedownloadservlet?ref_file=some_uuid">download</a>

因此，当文件不在服务器环境中时，如何使文件可下载， 我听说过getResourceAsStream()方法可以做到这一点，但是可能有人会用简单的代码片段来帮助我实现这一点吗?

So, How to make file downloadable when it is outside the server context, I heard about getResourceAsStream() method which would do this , But would any one help me on how to do this, probably with simple code snippet?

推荐答案

在这里我找到了答案，

 response.setContentType("application/msword");
 response.setHeader("Content-Disposition","attachment;filename=downloadname.doc");
 File file=new File("d:\\test.doc");
 InputStream is=new FileInputStream(file);
 int read=0;
 byte[] bytes = new byte[BYTES_DOWNLOAD];
 OutputStream os = response.getOutputStream();
 while((read = is.read(bytes))!= -1){
  os.write(bytes, 0, read);
 }
 os.flush();
 os.close();

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