用java语言，写一段easypoi导出为excel的示例，要求自定义列名，列数随着字段值name的数据的个数增多

好的，我可以为你提供相关的示例代码：

// 导出excel
public static void exportExcel(List<User> userList, HttpServletResponse response) {
    try {
        // 定义excel文件名
        String fileName = "userList_" + DateFormatUtils.format(new Date(), "yyyyMMddHHmmss") + ".xlsx";
        response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
        response.setContentType("application/vnd.ms-excel");

        // 自定义列名
        List<CustomerExcelProperty> excelProperties = new ArrayList<>();
        int i = 0;
        for (String name : userList.get(0).getName().split(",")) {
            CustomerExcelProperty excelProperty = new CustomerExcelProperty();
            excelProperty.setIndex(++i);
            excelProperty.setName(name);
            excelProperty.setMethod("getName");
            excelProperties.add(excelProperty);
        }

        // 设置excel字段信息
        List<ExcelExportEntity> exportFields = excelProperties.stream().map(property -> {
            ExcelExportEntity exportEntity = new ExcelExportEntity(property.getName(), property.getName());
            exportEntity.setMethod(property.getMethod());
            exportEntity.setFormat(property.getFormat());
            exportEntity.setWidth(16);
            exportEntity.setHeight(14);
            exportEntity.setReplace(null);
            exportEntity.setMergeVertical(false);
            exportEntity.setMergeHorizontal(false);
            exportEntity.setWrap(false);
            exportEntity.setShrinkToFit(false);
            exportEntity.setOrderNum(property.getIndex());
            return exportEntity;
        }).collect(Collectors.toList());

        // 执行导出
        Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams("用户信息", "用户信息"), exportFields, userList);
        OutputStream outputStream = response.getOutputStream();
        workbook.write(outputStream);
        outputStream.flush();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

// 用户实体类
public class User {
    private String name;
    private Integer age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

// 自定义列属性类
public class CustomerExcelProperty {
    private int index;
    private String name;
    private String method;
    private String format;

    public int getIndex() {
        return index;
    }

    public void setIndex(int index) {
        this.index = index;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getMethod() {
        return method;
    }

    public void setMethod(String method) {
        this.method = method;
    }

    public String getFormat() {
        return format;
    }

    public void setFormat(String format) {
        this.format = format;
    }
}

希望这个示例可以帮助到你！