下载Excel模板

前端调用：
function downExcel() {
window.location = __ctx + “/exportTmpl?fileName=SAMPlatformTmpl.xlsx”;
}
后台代码：

/**
	 * 导出(或下载模板)
	 * 文件存放路径为：main/resources/template/files/
	 * Build后路径为：main/webapp/WEB-INF/classes/template/files/
	 *
	 * @param response
	 * @param path 文件路径，默认 template/files/
	 * @param fileName 导出 excel 的文件名, 含后缀
	 * @throws Exception
	 */
	@RequestMapping("exportTmpl")
	@ResponseBody
	public void exportTmpl(HttpServletResponse response, String path, String fileName) throws Exception {
		response.setHeader("Content-Disposition", "attachment;filename=" + new String(fileName.getBytes("utf-8"), "iso8859-1"));
		response.setContentType("application/ynd.ms-excel;charset=UTF-8");
		String filePath = StringUtil.isEmpty(path)?"template/files/":path;
		InputStream is = getClass().getClassLoader().getResourceAsStream(filePath + fileName);
		OutputStream out = response.getOutputStream();
		byte[] b = new byte[1024];
		int len;
		while ((len = is.read(b)) != -1) {
			out.write(b,0,len);
		}
		out.flush();
		out.close();
		is.close();
	}```