文件下载

    /**
     * 文件下载
     * 
     * @param response
     * @param file
     */
    public static void downLoad(HttpServletResponse response, File file) {
        if (file.exists()) {
            response.setContentType("application/vnd.ms-excel;charset=UTF-8");
            response.setCharacterEncoding("UTF-8");
            byte[] buffer = new byte[1024];
            try (OutputStream os = response.getOutputStream();
                    FileInputStream fis = new FileInputStream(file);
                    BufferedInputStream bis = new BufferedInputStream(fis);) {
                response.setHeader("Content-Disposition",
                        "attachment;fileName=" + java.net.URLEncoder.encode(file.getName(), "UTF-8"));
                int i = bis.read(buffer);
                while (i != -1) {
                    os.write(buffer,0,i);
                    i = bis.read(buffer);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }