easyexcel模板导出并且公式自动计算的方法

	ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
	EasyExcel.write(outputStream).withTemplate(filestream).sheet().doFill(templateMap);
	byte[] data = outputStream.toByteArray();
	ByteArrayInputStream inputStream = new ByteArrayInputStream(data);

	try {
		// 将字节数组转换为 XSSFWorkbook
		XSSFWorkbook workbook = new XSSFWorkbook(inputStream);
		// 创建工作表
		Sheet sheet = workbook.getSheet("模板");
		// 获取公式求值器
		FormulaEvaluator evaluator = workbook.getCreationHelper().createFormulaEvaluator();

		// 计算所有公式
		for (Row row : sheet) {
			for (Cell cell : row) {
				if (cell.getCellType() == CellType.FORMULA.getCode()) {
					evaluator.evaluateInCell(cell);
				}
			}
		}
		// 写入响应体
		response.setContentType("application/vnd.ms-excel");
		response.setHeader("Content-Disposition", "attachment; filename=yourFile.xlsx");
		workbook.write(response.getOutputStream());
		response.getOutputStream().flush();
	} catch (IOException e) {
		throw new RuntimeException(e);
	}

前端下载二进制文件

exportEleConsume(params: any) {

const url = /api/energy/report/exportYddhtjb?date=${params.date}&&deviceCategory=${params.deviceCategory};

this.http.request('GET', url, { responseType: 'blob', observe: 'response' }).subscribe(res => {

const blob = new Blob([res.body!], { type: 'application/octet-stream' });

saveAs(blob, decodeURI('电能数据采集.xls'));

});

}