使用java操作Excel文件

使用java操作Excel文件(4)     public HSSFSheet getSheet(File f)
    { //得到一个sheet对象。

        HSSFWorkbook wb = null;
        POIFSFileSystem xlsf = null;
        try
        {
            xlsf = new POIFSFileSystem(new FileInputStream(f));
            wb = new HSSFWorkbook(xlsf);
        }
        catch (IOException ex)
        {
            System.err.println("错误：文件流输入有误。");
            ex.printStackTrace();
        }
        HSSFSheet sheet = wb.getSheetAt(0);
        return sheet;
    }

//-----------------------------------
    public String[][] outresult()
    {
        int length[] = outresultlength();
        String result[][] = new String[length[0]][length[1]];

        int lastrow = sheet.getLastRowNum()+1;
        for (int i = 0; i < lastrow; i++)
        {
            HSSFRow row = sheet.getRow(i);
            int lastcell = row.getLastCellNum();
            for (int j = 0; j < lastcell; j++)
            {