HSSFCell 读单元格的数据类型

String cellValue = "";  
        DecimalFormat df = new DecimalFormat("#");  
        switch (cell.getCellType()) {  
        case HSSFCell.CELL_TYPE_STRING:  
            cellValue = cell.getRichStringCellValue().getString().trim();  
            break;  
        case HSSFCell.CELL_TYPE_NUMERIC:  
            cellValue = df.format(cell.getNumericCellValue()).toString();  
            break;  
        case HSSFCell.CELL_TYPE_BOOLEAN:  
            cellValue = String.valueOf(cell.getBooleanCellValue()).trim();  
            break;  
        case HSSFCell.CELL_TYPE_FORMULA:  
            cellValue = cell.getCellFormula();  
            break;  
        default:  
            cellValue = "";  
        }