Converting XLS to CSV files Using Java

package com.simplecode.excel;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Iterator;

import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;

class XlstoCSV
{
static void xls(File inputFile, File outputFile)
{
	// For storing data into CSV files
	StringBuffer data = new StringBuffer();
	try
	{
	FileOutputStream fos = new FileOutputStream(outputFile);

	// Get the workbook object for XLS file
	HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(inputFile));
	// Get first sheet from the workbook
	HSSFSheet sheet = workbook.getSheetAt(0);
	Cell cell;
	Row row;

	// Iterate through each rows from first sheet
	Iterator rowIterator = sheet.iterator();
	while (rowIterator.hasNext())
	{
		row = rowIterator.next();
		// For each row, iterate through each columns
		Iterator 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');
		}
	}

	fos.write(data.toString().getBytes());
	fos.close();
	}
	catch (FileNotFoundException e)
	{
		e.printStackTrace();
	}
	catch (IOException e)
	{
		e.printStackTrace();
	}
	}

	public static void main(String[] args)
	{
		File inputFile = new File("C:\\test.xls");
		File outputFile = new File("C:\\output.csv");
		xls(inputFile, outputFile);
	}
}