Excel読み込みJXL

/**
 * jxl  Excel .
 * @author sakyone
 */
public class JxlExcelReader {

	/**
	 * @return  String[]  
	 */
	public List readExcel(InputStream in) {
		List lt = new ArrayList();
		Workbook wb = null;
		try {
			wb = Workbook.getWorkbook(in);
			Sheet[] sheets = wb.getSheets(); // 
			for (int i = 0; i < sheets.length; i++) {
				Sheet sheet = sheets[i];
				System.err.println("----------sheet"+i+" "+sheet.getRows()+" ------------");
				for (int j = 0; j < sheet.getRows(); j++) {
					
					Cell[] cells = sheet.getRow(j); // 
					if (cells != null && cells.length > 0) { // 
//						System.err.println("----------- "+cells.length+" ------------");
						String[] dataCells = new String[cells.length];
						for (int k = 0; k < cells.length; k++) {
							dataCells[k] = "" + cells[k].getContents(); // 
						}//column
						lt.add(dataCells);
					}
				}//one sheet
			}//xls file
		} catch (BiffException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (wb != null) {
				wb.close();
			}
		}

		return lt;
	}