javaWeb页面实现下载

jsp页面发送请求，后台实现指定路径下的文件，在浏览器上完成下载功能。
@RequestMapping(value = "downloadFile")
public void downloadFile(HttpServletResponse response) throws Exception {
    BufferedInputStream bis = null;
    BufferedOutputStream bos = null;
    InputStream is = null;
    String zipFileName = "test.zip";
    String zipFilePath = "D:\";
    File file = new File(zipFilePath + zipFileName);
    try {
        is = new FileInputStream(file);
        response.reset();
        response.setContentType("application/x-msdownload");
        response.setHeader("Content-Length", String.valueOf(file.length()));
        response.setHeader(
                "Content-disposition",
                "attachment; filename="
                        + new String(zipFileName.getBytes("GBK"),
                        "ISO8859-1"));
        bis = new BufferedInputStream(is);
        bos = new BufferedOutputStream(response.getOutputStream());
        byte[] buff = new byte[2048];
        int bytesRead;
        while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
            bos.write(buff, 0, bytesRead);
        }
    } catch (Exception e) {
        e.printStackTrace();
        response.setContentType("text/html");
        response.getWriter().print("download failed");
    } finally {
        try {
            if (is != null)
                is.close();
            if (bis != null)
                bis.close();
            if (bos != null)
                bos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}