详情代码

实体类

@Data
public class ComplexHeadData {@ExcelProperty({"主标题", "字符串标题"})private String string;@ExcelProperty({"主标题", "日期标题"})private Date date;@ExcelProperty({"主标题", "数字标题"})private Double doubleData;
}

Controller层

@RestController
@RequestMapping("/ex/test")
public class DemoMergeDataController {@GetMapping("/getTestDemo")public R getTestDemo(HttpServletResponse response) throws IOException {//        extracted(response);// 定义导出的Excel文件名String fileName = "ComplexHeadData.xlsx";// 设置响应的内容类型为二进制流，这是文件下载的标准设置response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);// 设置响应头的Content-Disposition，使用"attachment"指示浏览器这是一个需要下载的文件，
// 并使用URLEncoder对文件名进行编码处理，确保文件名的兼容性跨平台和浏览器response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=" + URLEncoder.encode(fileName, String.valueOf(StandardCharsets.UTF_8)));EasyExcel.write(response.getOutputStream(),ComplexHeadData.class).sheet().doWrite(data());return R.success();}//写入数据生成private List<ComplexHeadData> data() {List<ComplexHeadData> list = new ArrayList<ComplexHeadData>();for (int i = 0; i < 10; i++) {ComplexHeadData data = new ComplexHeadData();data.setString("字符串" + i);data.setDate(new Date());data.setDoubleData(0.56);list.add(data);}return list;}

测试