利用 Servlet 下載檔案儲存(不以應用程式開啟)

//於 Servlet 設定 ContentType 與 Header，讓瀏覽器知道不要以應用程式開啟 

// Set the headers.
res.setContentType("application/x-download");
res.setHeader("Content-Disposition", "attachment; filename=" + filename);

// Send the file.
OutputStream out = res.getOutputStream(  );
returnFile(filename, out);  

//returnFile 實作內容

public static void returnFile(String filename, OutputStream out)
                             throws FileNotFoundException, IOException {
    InputStream in = null;
    try {
      in = new BufferedInputStream(new FileInputStream(filename));
      byte[  ] buf = new byte[4 * 1024];  // 4K buffer
      int bytesRead;
      while ((bytesRead = in.read(buf)) != -1) {
        out.write(buf, 0, bytesRead);
      }
    }
    finally {
      if (in != null) in.close(  );
    }
  } 

參考網址：

http://onjava.com/pub/a/onjava/excerpt/jebp_3/index1.html?page=2

http://onjava.com/pub/a/onjava/excerpt/jebp_3/index3.html