使用EasyExcel根据模板导出文件方式

@Slf4j
@Component
public class ExportUtil {
    public static final String TEMPLATE_ROOT_PATH = "template";
    public static final String EXCEL_POSTFIX = "." + CommonConst.EXCEL_TYPE_XLSX;
    // ...
}

public static void downloadExcelByTemplate(String templatePath, String fileName, 
                                         List<?> list, Object obj) {
    String templateFileName = TEMPLATE_ROOT_PATH + File.separator + templatePath;
    download(fileName + EXCEL_POSTFIX, outputStream -> {
        try (ExcelWriter excelWriter = EasyExcel.write(outputStream)
                .withTemplate(ExportUtil.class.getClassLoader()
                .getResourceAsStream(templateFileName)).build()) {
            WriteSheet writeSheet = EasyExcel.writerSheet().build();
            FillConfig fillConfig = FillConfig.builder().forceNewRow(Boolean.TRUE).build();
            excelWriter.fill(list, fillConfig, writeSheet);
            excelWriter.fill(obj, fillConfig, writeSheet);
        } catch (Exception e) {
            log.error("Writing template failed:{}", e.getMessage());
            throw new BusinessException(BusinessExceptionEnum.EXPORT_FAILED);
        }
    });
}

public static void download(String fileName, Consumer<ServletOutputStream> write) {
    HttpServletResponse response = getHttpServletResponse(fileName);
    ServletOutputStream outputStream;
    try {
        outputStream = response.getOutputStream();
    } catch (IOException e) {
        log.error("Failed to read response and write stream:{}", e.getMessage());
        throw new BusinessException(BusinessExceptionEnum.EXPORT_FAILED);
    }
    write.accept(outputStream);
}

@SneakyThrows
public static HttpServletResponse getHttpServletResponse(String fileName) {
    ServletRequestAttributes servletRequestAttributes = 
        (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
    if (servletRequestAttributes == null || servletRequestAttributes.getResponse() == null) {
        log.error("Unable to obtain HttpServletResponse.");
        throw new BusinessException(BusinessExceptionEnum.EXPORT_FAILED);
    }
    HttpServletResponse res = servletRequestAttributes.getResponse();
    res.setContentType("application/octet-stream; charset=" + StandardCharsets.UTF_8);
    res.setHeader("Content-disposition", "attachment;filename=" + 
        URLEncoder.encode(fileName, StandardCharsets.UTF_8) + ";" + 
        "filename*=utf-8''" + URLEncoder.encode(fileName, StandardCharsets.UTF_8));
    return res;
}

// 准备数据
UserInfo userInfo = new UserInfo("张三", "技术部");
List<Order> orders = Arrays.asList(
    new Order("订单001", new Date(), 2999.0),
    new Order("订单002", new Date(), 3999.0)
);

// 执行导出
ExportUtil.downloadExcelByTemplate("user_template.xlsx", "用户订单", orders, userInfo);