easyexcel导出2万条，每2000条导出一个sheet

后端接口

@GetMapping("/exportTrack")
	public void exportTrack(HttpServletResponse response) throws IOException {
		OutputStream out = null;
		try {
			out =  getOutputStream(response,"用户信息表",ExcelTypeEnum.XLSX);
			ExcelWriter writer = new ExcelWriter(out, ExcelTypeEnum.XLSX);
			List> list = cardlistService.selectAllCardList();
			List tdevicedtlVos = BeanUtils.mapsToBeans(list, CardlistExcelVO.class);
			List> partition = Lists.partition(tdevicedtlVos, 2000);
			for (int i = 0; i < partition.size(); i++) {
				com.alibaba.excel.metadata.Sheet sheet = new Sheet((i + 1), 0, CardlistExcelVO.class, "sheet" + (i + 1), null);
				writer.write(partition.get(i), sheet);
			}
			writer.finish();
		} finally {
			try {
				out.flush();
				out.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

	}

private OutputStream getOutputStream(HttpServletResponse response, String fileName,
										 ExcelTypeEnum excelTypeEnum) {
		try {
			// 设置响应输出的头类型
			if (Objects.equals(".xls", excelTypeEnum.getValue())) {
				//导出xls格式
				response.setContentType("application/vnd.ms-excel;charset=GBK");
			} else if (Objects.equals(".xlsx", excelTypeEnum.getValue())) {
				//导出xlsx格式
				response.setContentType(
						"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=GBK");
			}
			// 设置下载文件名称(注意中文乱码)
			response.addHeader("Content-Disposition",
					"attachment;filename=" + new String((fileName).getBytes("GB2312"), "ISO8859-1") + excelTypeEnum
							.getValue());
			response.addHeader("Pragma", "No-cache");
			response.addHeader("Cache-Control", "No-cache");
			response.setCharacterEncoding("utf8");
			return response.getOutputStream();
		} catch (IOException e) {
			log.error("EasyExcelUtil-->getOutputStream exception:", e);
		}
		return null;
	}

前端

（1）前端接口必须返回类型为responseType:‘blob’

export const exportTrack= (reqParams) => request({
  url: baseOtherUrl + '/SpecialAaccountBastionHost/exportBastionHost',
  method: 'post',
  responseType: 'blob',
  data: reqParams
});

（2）vue使用blob

exportBehaviorTrack: function () {
          
                exportTrack({key:value}).then(response => {
                    if (window.navigator.msSaveOrOpenBlob) {
                        // 兼容IE
                        const blob = new Blob([response]);
                        window.navigator.msSaveBlob(blob, "行为轨迹信息表.xls");
                    } else { // 处理返回的文件流
                        const blob = response.data
                        const link = document.createElement('a')
                        link.href = URL.createObjectURL(blob)
                        link.download = '行为轨迹信息表.xls'
                        document.body.appendChild(link)
                        link.click()
                        window.setTimeout(function () {
                            URL.revokeObjectURL(blob)
                            document.body.removeChild(link)
                        }, 0)
                    }
                })
        },

Java mapper

1、	List> selectAllCardList();

2、
		select * from  t_cardlist