cómo convertir Excel a CSV mediante programación en el ejemplo de código Java

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Ejemplo: convertir Excel a CSV en Java

import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.util.Iterator;import org.apache.commons.io.FilenameUtils;import org.apache.poi.hssf.usermodel.HSSFWorkbook;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 classXlsxtoCSV

    static void xlsx(File inputFile, File outputFile)// For storing data into CSV files
        StringBuffer data = new StringBuffer();try
            FileOutputStream fos = new FileOutputStream(outputFile);// Get the workbook objectfor XLSX file
            FileInputStream fis = new FileInputStream(inputFile);
            Workbook workbook = null;

            String ext = FilenameUtils.getExtension(inputFile.toString());if(ext.equalsIgnoreCase("xlsx"))
                workbook = new XSSFWorkbook(fis);elseif(ext.equalsIgnoreCase("xls"))
                workbook = new HSSFWorkbook(fis);// Get first sheet from the workbook

            int numberOfSheets = workbook.getNumberOfSheets();
            Row row;
            Cell cell;// Iterate through each rows from first sheet

            for(int i =0; i < numberOfSheets; i++)
                Sheet sheet = workbook.getSheetAt(0);
                Iterator<Row> rowIterator = sheet.iterator();while(rowIterator.hasNext())
                    row = rowIterator.next();// For each row, iterate through each columns
                    Iterator<Cell> cellIterator = row.cellIterator();while(cellIterator.hasNext())

                        cell = cellIterator.next();

                        switch (cell.getCellType())
                        case Cell.CELL_TYPE_BOOLEAN:
                            data.append(cell.getBooleanCellValue()+",");break;
                        case Cell.CELL_TYPE_NUMERIC:
                            data.append(cell.getNumericCellValue()+",");break;
                        case Cell.CELL_TYPE_STRING:
                            data.append(cell.getStringCellValue()+",");break;

                        case Cell.CELL_TYPE_BLANK:
                            data.append(""+",");break;
                        default:
                            data.append(cell +",");
                    data.append('n');// appending new line after each row
                
            fos.write(data.toString().getBytes());
            fos.close(); catch (Exception ioe)
            ioe.printStackTrace();// testing the application

    public static void main(String[] args)//int i=0;// reading filefrom desktop
        File inputFile = new File(".//src//test//resources//yourExcel.xls");//provide your path
        // writing excel data to csv
        File outputFile = new File(".//src//test//resources//yourCSV.csv");//provide your path
        xlsx(inputFile, outputFile);
        System.out.println("Conversion of "+ inputFile +" to flat file: "+ outputFile +" is completed");

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