如何通过java删除excel文件中的空白列？

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import java.io.*;

public static void deleteBlankColumns(String filePath, String sheetName) throws IOException {
    FileInputStream fileInputStream = new FileInputStream(filePath);
    Workbook workbook = new XSSFWorkbook(fileInputStream);
    Sheet sheet = workbook.getSheet(sheetName);
    
    int lastRowNum = sheet.getLastRowNum();
    int lastCellNum = sheet.getRow(0).getLastCellNum();
    
    for (int i = 0; i < lastCellNum; i++) {
        boolean isBlankColumn = true;
        for (int j = 0; j <= lastRowNum; j++) {
            Row row = sheet.getRow(j);
            Cell cell = row.getCell(i, Row.MissingCellPolicy.CREATE_NULL_AS_BLANK);
            if (cell.getCellType() != CellType.BLANK) {
                isBlankColumn = false;
                break;
            }
        }
        if (isBlankColumn) {
            for (int j = 0; j <= lastRowNum; j++) {
                Row row = sheet.getRow(j);
                Cell cell = row.getCell(i);
                row.removeCell(cell);
            }
        }
    }
    
    FileOutputStream fileOutputStream = new FileOutputStream(filePath);
    workbook.write(fileOutputStream);
    fileOutputStream.close();
    workbook.close();
    fileInputStream.close();
}

public static void main(String[] args) {
    String filePath = "path/to/your/excel/file.xlsx";
    String sheetName = "Sheet1";
    
    try {
        deleteBlankColumns(filePath, sheetName);
        System.out.println("空白列删除成功！");
    } catch (IOException e) {
        e.printStackTrace();
    }
}