Convert csv to xls/xlsx using Apache poi?

I need to convert csv to xls/xlsx in my project? How can i do that? Can anyone post me some examples? I want to do it with Apache poi. I also need to create a cell from java side.

You can try following method to create xlsx file using apache-poi.

public static void csvToXLSX() {
    try {
        String csvFileAddress = "test.csv"; //csv file address
        String xlsxFileAddress = "test.xlsx"; //xlsx file address
        XSSFWorkbook workBook = new XSSFWorkbook();
        XSSFSheet sheet = workBook.createSheet("sheet1");
        String currentLine=null;
        int RowNum=0;
        BufferedReader br = new BufferedReader(new FileReader(csvFileAddress));
        while ((currentLine = br.readLine()) != null) {
            String str[] = currentLine.split(",");
            RowNum++;
            XSSFRow currentRow=sheet.createRow(RowNum);
            for(int i=0;i<str.length;i++){
                currentRow.createCell(i).setCellValue(str[i]);
            }
        }

        FileOutputStream fileOutputStream =  new FileOutputStream(xlsxFileAddress);
        workBook.write(fileOutputStream);
        fileOutputStream.close();
        System.out.println("Done");
    } catch (Exception ex) {
        System.out.println(ex.getMessage()+"Exception in try");
    }
}