导出excel，后端返回文档流。前后端代码

后端代码，方便查看，放在一起了

/**
	 * 导出报名表
	 */
	@Log("导出报名表")
	@GetMapping( "/export")
	@ResponseBody
	@RequiresPermissions("platform:activity:export")
	public void export(HttpServletResponse response,@RequestParam("id") Integer id) throws Exception {
		SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
		List list = activityService.listEnrollInfo(id);
		if (list == null || list.get(0).getEnrollNum() == 0) {
			throw new Exception("报名人数为0，无法导出！");
		}
		response.reset();
		response.setCharacterEncoding("utf-8");
		String fileName = list.get(0).getActivityName()+"报名信息";
		XSSFWorkbook wb = new XSSFWorkbook();
		XSSFSheet sheet = wb.createSheet(fileName);
		XSSFRow row = null;
		row = sheet.createRow(0);//创建第一个单元格
		row.setHeight((short) (400));

		row.createCell(0).setCellValue("活动名称");
		row.createCell(1).setCellValue("报名人数");
		row.createCell(2).setCellValue("学员姓名");
		row.createCell(3).setCellValue("城市");
		row.createCell(4).setCellValue("手机号");
		row.createCell(5).setCellValue("邮箱");
		row.createCell(6).setCellValue("备注");

		for (int i = 0; i < list.size(); i++) {
			row = sheet.createRow(i + 1);
			ActivityEnrollInfo devmonitorData = list.get(i);
			row.createCell(0).setCellValue(devmonitorData.getActivityName());
			row.createCell(1).setCellValue(devmonitorData.getEnrollNum());
			row.createCell(2).setCellValue(devmonitorData.getName());
			row.createCell(3).setCellValue(devmonitorData.getCity());
			row.createCell(4).setCellValue(devmonitorData.getMobile());
			row.createCell(5).setCellValue(devmonitorData.getEmail());
		}
		sheet.setDefaultRowHeight((short) (400));
		//列宽自适应
		for (int i = 0; i <= 13; i++) {
			sheet.autoSizeColumn(i);
		}
		response.setContentType("application/vnd.ms-excel;charset=utf-8");
		OutputStream os = null;
		try {
			os = response.getOutputStream();
			response.addHeader("Content-disposition", "attachment;filename=" + fileName + "-" + simpleDateFormat.format(new Date()) + ".xlsx");//默认Excel名称
			wb.write(os);
			os.flush();
			os.close();
			return;
		} catch (IOException e) {
			e.printStackTrace();
		}
		return;
	}

前端代码

因为是返回文档流，采用window.open(urls); 的方式下载excel。注意这种方式需要后台是支持get请求