public void downExcelModel(HttpServletRequest request, HttpServletResponse response) throws IOException{
    java.io.OutputStream o = response.getOutputStream();
    byte b[] = new byte[500];
    File fileLoad = new File(request.getRealPath("/WEB-INF/"+"/page/back/tps/上传模板.xlsx"));
    response.reset();
    response.setContentType("application/vnd.ms-excel");
    response.setHeader("content-disposition","attachment; filename=模板.xlsx");
    long fileLength = fileLoad.length();
    String length1 = String.valueOf(fileLength);
    response.setHeader("Content_Length", length1);
    FileInputStream in = new FileInputStream(fileLoad);
    int n;
    while ((n = in.read(b)) != -1) {
        o.write(b, 0, n);
    }
    in.close();
    o.close();
}