如何使用java从给定列中的excel中提取唯一记录

import java.io.FileInputStream;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ExcelUniqueRecordsExtractor {
    public static void main(String[] args) {
        String filePath = "path/to/your/excel/file.xlsx";
        int columnIndex = 2; // 从0开始计数的列索引

        try (FileInputStream fis = new FileInputStream(filePath);
             Workbook workbook = new XSSFWorkbook(fis)) {

            Sheet sheet = workbook.getSheetAt(0); // 选择第一个工作表

            Set<String> uniqueRecords = new HashSet<>();

            for (Row row : sheet) {
                Cell cell = row.getCell(columnIndex);
                if (cell != null) {
                    uniqueRecords.add(cell.getStringCellValue());
                }
            }

            for (String record : uniqueRecords) {
                System.out.println(record);
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}