Question

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，或者像代理一样执行，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一样完成它。

使用servlet / jsp实现这一目标的任何方便方法？

由于

Answer 1

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。

@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());
}

这有什么机会你想听到什么？

@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());
}

Answer 2

int BUFF_SIZE = 1024;
byte[] buffer = new byte[BUFF_SIZE];
File fileMp3 = new File("C:\Users\Ajay\*.mp3");
FileInputStream fis = new FileInputStream(fileMp3);
response.setContentType("audio/mpeg");
response.setHeader("Content-Disposition", "filename=\"hoge.txt\"");
response.setContentLength((int) fileMp3.length());
OutputStream os = response.getOutputStream();

try {
    int byteRead = 0;
    while ((byteRead = fis.read()) != -1) {
       os.write(buffer, 0, byteRead);

    }
    os.flush();
} catch (Exception excp) {
    downloadComplete = "-1";
    excp.printStackTrace();
} finally {
    os.close();
    fis.close();
}

Java servlet读取文件并将其作为响应发送

2 个答案: