Map<String, List<PortReportResultVo>> relayLinkAndPortMap = new HashMap<>(); 遍历这个map，value为要导出的数据，都在一个sheet页中分分成多块内容，每块内容的表头可以自定义为2行，用easyExcel实现详细代码

可以使用 EasyExcel 的 write 方法来实现将数据导出到 Excel 表格中，代码如下：

// 遍历 map
for (Map.Entry<String, List<PortReportResultVo>> entry : relayLinkAndPortMap.entrySet()) {
    String sheetName = entry.getKey(); // sheet 名称
    List<PortReportResultVo> dataList = entry.getValue(); // 要导出的数据

    // 自定义表头
    List<List<String>> head = new ArrayList<>();
    List<String> head0 = new ArrayList<>();
    head0.add("表头1-1");
    head0.add("表头1-2");
    head0.add("表头1-3");
    head.add(head0);
    List<String> head1 = new ArrayList<>();
    head1.add("表头2-1");
    head1.add("表头2-2");
    head1.add("表头2-3");
    head.add(head1);

    // 写入 Excel
    EasyExcel.write(fileName)
            .sheet(sheetName)
            .head(head)
            .registerWriteHandler(new CustomCellWriteHandler()) // 自定义单元格样式
            .doWrite(dataList);
}

需要自定义单元格样式时，可以实现 CustomCellWriteHandler 接口，代码如下：

public class CustomCellWriteHandler implements WriteHandler {

    @Override
    public void beforeSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {

    }

    @Override
    public void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {
        // 设置第 1 行的单元格样式
        writeSheetHolder.getSheet().getRow(0).getCell(0).setCellStyle(getCellStyle(writeWorkbookHolder.getWorkbook()));
        writeSheetHolder.getSheet().getRow(0).getCell(1).setCellStyle(getCellStyle(writeWorkbookHolder.getWorkbook()));
        writeSheetHolder.getSheet().getRow(0).getCell(2).setCellStyle(getCellStyle(writeWorkbookHolder.getWorkbook()));

        // 设置第 2 行的单元格样式
        writeSheetHolder.getSheet().getRow(1).getCell(0).setCellStyle(getCellStyle(writeWorkbookHolder.getWorkbook()));
        writeSheetHolder.getSheet().getRow(1).getCell(1).setCellStyle(getCellStyle(writeWorkbookHolder.getWorkbook()));
        writeSheetHolder.getSheet().getRow(1).getCell(2).setCellStyle(getCellStyle(writeWorkbookHolder.getWorkbook()));
    }

    @Override
    public void afterRowCreate(WriteSheetHolder writeSheetHolder, WriteRowHolder writeRowHolder) {

    }

    @Override
    public void afterCellCreate(WriteSheetHolder writeSheetHolder, WriteRowHolder writeRowHolder, WriteCellHolder writeCellHolder) {

    }

    @Override
    public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteRowHolder writeRowHolder, WriteCellHolder writeCellHolder) {

    }

    private CellStyle getCellStyle(Workbook workbook) {
        CellStyle cellStyle = workbook.createCellStyle();
        cellStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());
        cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        cellStyle.setAlignment(HorizontalAlignment.CENTER);
        cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
        return cellStyle;
    }
}