Map<String, List<PortReportResultVo>> relayLinkAndPortMap = devPortReportByEs.getRelayLinkAndPortMap(); 遍历这个map，key为表头，value为数据，在一个sheet页中用easyExcel实现，导包也展示

好的，你可以参考以下代码实现：

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.metadata.BaseRowModel;
import com.alibaba.excel.metadata.Sheet;
import com.alibaba.excel.support.ExcelTypeEnum;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class ExcelUtil {

    /**
     * 导出到Excel
     *
     * @param outputStream 输出流
     * @param dataMap      数据集合，key为表头，value为数据
     * @throws IOException
     */
    public static void exportExcel(OutputStream outputStream, Map<String, List<PortReportResultVo>> dataMap) throws IOException {
        List<PortReportResultVo> dataList = new ArrayList<>();
        for (Map.Entry<String, List<PortReportResultVo>> entry : dataMap.entrySet()) {
            // 添加表头
            PortReportResultVo header = new PortReportResultVo();
            header.setPortCode(entry.getKey());
            dataList.add(header);

            // 添加数据
            List<PortReportResultVo> list = entry.getValue();
            dataList.addAll(list);
        }

        // 导出Excel
        EasyExcel.write(outputStream, PortReportResultVo.class)
                .excelType(ExcelTypeEnum.XLSX)
                .sheet("Sheet1")
                .doWrite(dataList);
    }

    /**
     * 导出到文件
     *
     * @param filePath 文件路径
     * @param dataMap  数据集合，key为表头，value为数据
     * @throws IOException
     */
    public static void exportExcel(String filePath, Map<String, List<PortReportResultVo>> dataMap) throws IOException {
        try (OutputStream outputStream = new FileOutputStream(filePath)) {
            exportExcel(outputStream, dataMap);
        }
    }

    /**
     * 导出到文件
     *
     * @param filePath 文件路径
     * @param dataMap  数据集合，key为表头，value为数据
     * @throws IOException
     */
    public static void exportExcel(String filePath, Map<String, List<PortReportResultVo>> dataMap, String sheetName) throws IOException {
        try (OutputStream outputStream = new FileOutputStream(filePath)) {
            exportExcel(outputStream, dataMap, sheetName);
        }
    }

    /**
     * 导出到Excel
     *
     * @param outputStream 输出流
     * @param dataMap      数据集合，key为表头，value为数据
     * @param sheetName    sheet页名称
     * @throws IOException
     */
    public static void exportExcel(OutputStream outputStream, Map<String, List<PortReportResultVo>> dataMap, String sheetName) throws IOException {
        List<PortReportResultVo> dataList = new ArrayList<>();
        for (Map.Entry<String, List<PortReportResultVo>> entry : dataMap.entrySet()) {
            // 添加表头
            PortReportResultVo header = new PortReportResultVo();
            header.setPortCode(entry.getKey());
            dataList.add(header);

            // 添加数据
            List<PortReportResultVo> list = entry.getValue();
            dataList.addAll(list);
        }

        // 导出Excel
        Sheet sheet = new Sheet(1, 0, PortReportResultVo.class);
        sheet.setSheetName(sheetName);
        EasyExcel.write(outputStream, PortReportResultVo.class)
                .excelType(ExcelTypeEnum.XLSX)
                .sheet(sheet)
                .doWrite(dataList);
    }

}

/**
 * Excel行数据类
 */
class PortReportResultVo extends BaseRowModel {

    @ExcelProperty(value = "端口编码", index = 0)
    private String portCode;

    @ExcelProperty(value = "端口名称", index = 1)
    private String portName;

    @ExcelProperty(value = "设备编码", index = 2)
    private String deviceCode;

    @ExcelProperty(value = "设备名称", index = 3)
    private String deviceName;

    // 省略getter/setter方法
}

其中，PortReportResultVo类为Excel行数据类，用于存储一行数据。ExcelUtil类中的exportExcel方法可以将Map<String, List<PortReportResultVo>>数据导出为一个Excel文件。你可以根据需要修改ExcelUtil类中的代码，并添加相应的依赖包，比如：

<dependencies>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>easyexcel</artifactId>
        <version>2.2.4</version>
    </dependency>
</dependencies>