java 使用流下載文件代碼

    public HttpServletResponse download(String path, HttpServletResponse response) {

        try {

            // path是指欲下載的文件的路徑。

            File file = new File(path);

            // 取得文件名。

            String filename = file.getName();

            // 取得文件的后綴名。

            String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();


        // 以流的形式下載文件。  
        InputStream fis = new BufferedInputStream(new FileInputStream(path));  
        byte[] buffer = new byte[fis.available()];  
        fis.read(buffer);  
        fis.close();  
        // 清空response  
        response.reset();  
        // 設置response的Header  
        response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));  
        response.addHeader("Content-Length", "" + file.length());  
        OutputStream toClient = new BufferedOutputStream(response.getOutputStream());  
        response.setContentType("application/octet-stream");  
        toClient.write(buffer);  
        toClient.flush();  
        toClient.close();  
    } catch (IOException ex) {  
        ex.printStackTrace();  
    }  
    return response;  
}  </pre>