Java servlet读取文件并将其作为响应发送 [英] Java servlet read a file and send it as response

问题描述

我正在尝试编写一个servlet，它将从远程位置读取（下载）文件并简单地将其作为响应发送，或者像代理一样，以隐藏实际文件的下载。我来自PHP背景，我可以像调用 file_get_contents 一样。

I'm trying to write a servlet which will read (download) file from a remote location and simply send it as response, acting more-or-less like a proxy to hide the actual file from getting downloaded. I'm from a PHP background where I can do it as simply as calling file_get_contents.

使用servlet / jsp实现这一目标的任何方便方法？

Any handy way to achieve this goal using servlet/jsp?

谢谢

推荐答案

这个怎么样？
FileUtils（Commons IO 2.5-SNAPSHOT API）

示例
/ src_directory_path /是远程服务器的安装目录。

example /src_directory_path/ is mount directory of remote server.

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
    throws ServletException, IOException {
    resp.setContentType("application/octet-stream");
    resp.setHeader("Content-Disposition", "filename=\"hoge.txt\"");
    File srcFile = new File("/src_directory_path/hoge.txt");
    FileUtils.copyFile(srcFile, resp.getOutputStream());
}

您有什么想听到的吗？

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
  InputStream in = new URL( "http://remote.file.url" ).openStream();
  IOUtils.copy(in, response.getOutputStream());
}

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