POI Java将xlsx转换为CSV逗号和双引号

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

import java.io.*;

public class XlsxToCsvConverter {
    public static void convert(String xlsxFilePath, String csvFilePath) throws IOException {
        Workbook workbook = new XSSFWorkbook(new FileInputStream(xlsxFilePath));
        Sheet sheet = workbook.getSheetAt(0);
        FileWriter csvWriter = new FileWriter(csvFilePath);

        for (Row row : sheet) {
            for (Cell cell : row) {
                switch (cell.getCellType()) {
                    case STRING:
                        csvWriter.append("\"").append(cell.getStringCellValue()).append("\",");
                        break;
                    case NUMERIC:
                        csvWriter.append(String.valueOf(cell.getNumericCellValue())).append(",");
                        break;
                    case BOOLEAN:
                        csvWriter.append(String.valueOf(cell.getBooleanCellValue())).append(",");
                        break;
                    case BLANK:
                        csvWriter.append(",");
                        break;
                    default:
                        csvWriter.append(",");
                }
            }
            csvWriter.append("\n");
        }

        csvWriter.flush();
        csvWriter.close();
        workbook.close();
    }

    public static void main(String[] args) {
        try {
            convert("input.xlsx", "output.csv");
            System.out.println("Conversion completed successfully.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}