可以通过自定义Comparator和HashSet来实现多列检测重复行的功能。以下是示例代码：

import org.apache.poi.ss.usermodel.*;

import java.util.HashSet;
import java.util.Comparator;

public class ExcelRowComparator implements Comparator {
    private Workbook workbook;
    private int[] columnsToCompare;

    public ExcelRowComparator(Workbook workbook, int[] columnsToCompare) {
        this.workbook = workbook;
        this.columnsToCompare = columnsToCompare;
    }

    /**
     * Overrides the compare method of Comparator interface and implements
     * logic for comparing two rows based on multiple columns
     *
     * @param row1 The first row to compare
     * @param row2 The second row to compare
     * @return A negative integer, zero, or a positive integer as the first row
     * is less than, equal to, or greater than the second.
     */
    @Override
    public int compare(Row row1, Row row2) {
        // Compare values of specified columns in the two rows
        for (int i = 0; i < columnsToCompare.length; i++) {
            int columnToCompare = columnsToCompare[i];
            Cell cell1 = row1.getCell(columnToCompare);
            Cell cell2 = row2.getCell(columnToCompare);
            if (cell1 != null && cell2 != null) {
                int compareResult = compareCell(cell1, cell2);
                if (compareResult != 0) {
                    return compareResult;
                }
            }
        }
        return 0;
    }

    /**
     * Compares two cells based on the type of cell value
     *
     * @param cell1 The first cell to compare
     * @param cell2 The second cell to compare
     * @return A negative integer, zero, or a positive integer as the first cell
     * is less than, equal to, or greater than the second.
     */
    private int compareCell(Cell cell1, Cell cell2) {
        // Check cell type
        if (cell1.getCellType() == CellType.NUMERIC && cell2.getCellType() == CellType.NUMERIC) {
            return Double.compare(cell1.getNumericCellValue(), cell2.getNumericCellValue());
        } else