动态表头导出excel

红框固定，绿框动态

引入依赖

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>3.1.1</version>
        </dependency>

工具类

import com.alibaba.excel.util.ListUtils;
import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.metadata.style.WriteFont;
import com.alibaba.excel.write.style.HorizontalCellStyleStrategy;
import com.mcsgis.saas.common.data.DynamicExcel;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.VerticalAlignment;

import java.util.List;

/**
 * @author: xianyu
 * @createDate: 2024/6/6
 * @description: 动态表头excel导出
 */
public class DynamicExcelUtil {

    /**
     * 设置表头
     *
     * @param dynamicExcel
     * @return
     */
    public static List<List<String>> head(DynamicExcel dynamicExcel) {
        List<List<String>> headTitles = ListUtils.newArrayList();
        String empty = " ";
        //表头可以根据实际情况进行修改
        List<String> fixedColumn = dynamicExcel.getFixedColumn();
        for (String s : fixedColumn) {
            headTitles.add(ListUtils.newArrayList(s));
        }

        //一级表头
        List<String> mealList = dynamicExcel.getMealList();
        //二级表头
        List<String> foodList = dynamicExcel.getFoodList();

        // 根据实际需要，决定要渲染多少列
        mealList.forEach(meal -> {
            foodList.forEach(food -> {
                headTitles.add(ListUtils.newArrayList(meal, food));
            });
        });
        return headTitles;
    }


    /**
     * 配置字体，表头背景等
     *
     * @return
     */
    public static HorizontalCellStyleStrategy setConfigure() {
        // 头的策略
        WriteCellStyle headWriteCellStyle = new WriteCellStyle();
        // 背景色
        headWriteCellStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());
        WriteFont headWriteFont = new WriteFont();
        // 加粗
        headWriteFont.setBold(true);
        headWriteCellStyle.setWriteFont(headWriteFont);

        // 内容的策略
        WriteCellStyle contentWriteCellStyle = new WriteCellStyle();
        // 字体策略
        WriteFont contentWriteFont = new WriteFont();
        // 字体大小
        //contentWriteFont.setFontHeightInPoints((short) 14);
        contentWriteCellStyle.setWriteFont(contentWriteFont);
        //边框
        //导出数据垂直居中
        contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
        //导出数据水平居中
        contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);
        contentWriteCellStyle.setBorderLeft(BorderStyle.THIN);
        contentWriteCellStyle.setBorderTop(BorderStyle.THIN);
        contentWriteCellStyle.setBorderRight(BorderStyle.THIN);
        contentWriteCellStyle.setBorderBottom(BorderStyle.THIN);

        //设置 自动换行
        contentWriteCellStyle.setWrapped(true);
        //设置
        // 这个策略是 头是头的样式 内容是内容的样式 其他的策略可以自己实现
        return new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);
    }
}

调用

    @GetMapping("load")
    public void downLoad(HttpServletResponse response) throws IOException {
        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
        response.setCharacterEncoding("utf-8");
        // 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系
        String fileName = URLEncoder.encode("按收费渠道", "UTF-8").replaceAll("\\+", "%20");
        response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + ".xlsx");
        ExcelWriter writer = EasyExcelFactory.write(response.getOutputStream())
                //列宽
                .registerWriteHandler(new SimpleColumnWidthStyleStrategy(16))
                .registerWriteHandler(new SimpleRowHeightStyleStrategy((short) 40, (short) 30))
                // 核心代码：表头和正文的样式在此
                .registerWriteHandler(DynamicExcelUtil.setConfigure())
                .build();

        // 动态添加表头，适用一些表头动态变化的场景
        WriteSheet sheet1 = new WriteSheet();
        sheet1.setSheetName("sheet001");
        sheet1.setSheetNo(0);

        DynamicExcel dynamicExcel = new DynamicExcel();
        //固定列
        List<String> fixedColumn = new ArrayList<>();
        fixedColumn.add("项目名称");
        fixedColumn.add("收费日期");

        //一级表头
        List<String> mealList = new ArrayList<>();
        mealList.add("线下-线下支付");
        mealList.add("线下微信扫码");
        mealList.add("微信小程序");
        mealList.add("PC微信");
        mealList.add("合计");

        //二级表头
        List<String> foodList = new ArrayList<>();
        foodList.add("实收金额");
        foodList.add("手续费金额");
        foodList.add("分账金额");
        foodList.add("实际到账金额");

        //内容
        List<List<Object>> contentList = new ArrayList<>();

        for (int i = 0; i < 10; i++) {
            List<Object> content = new ArrayList<>();
            content.add(1);
            content.add(2);
            content.add(3);
            content.add(4);
            content.add(5);
            content.add(6);
            content.add(7);
            content.add(8);
            content.add(9);
            content.add(10);
            content.add(11);
            content.add(12);
            content.add(13);
            content.add(14);
            content.add(15);
            content.add(16);
            content.add(17);
            content.add(18);
            content.add(19);
            content.add(20);
            content.add(21);
            content.add(22);

            contentList.add(content);
        }

        dynamicExcel.setFixedColumn(fixedColumn);
        dynamicExcel.setMealList(mealList);
        dynamicExcel.setFoodList(foodList);
        dynamicExcel.setContentList(contentList);

        // 创建一个表格，用于 Sheet 中使用
        WriteTable table = new WriteTable();
        table.setTableNo(1);
        // 核心代码：设置表头
        table.setHead(DynamicExcelUtil.head(dynamicExcel));
        // 写数据
        writer.write(dynamicExcel.getContentList(), sheet1, table);
        writer.finish();
    }

结果