java excel類

1.單元格各種型數據讀取

1.1 基本類型

處理的Excel數據包括字符型數據，數字、日期、公式等。

下面是單元格類型說明：

2實例
解析excel中數據，要求轉換爲文本方式存儲
2.1 寫一個excel解析的抽象類

public abstract class ExcelParser {

private String fileName;
        private InputStream inputStream;
    
        private final static String excel2003L = ".xls";//2003- 版本的excel
        private final static String excel2007U = ".xlsx";//2007+ 版本的excel
    
        protected final static DecimalFormat decimalFormat = new DecimalFormat("0");
        protected final static SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy/MM/dd");
    
        protected final static String[] columnStr = new String[]{
                "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"
        };
           protected OrderExcelParser(String fileName, InputStream inputStream) {
            this.fileName = fileName;
            this.inputStream = inputStream;
        }
    
        protected Workbook getWorkbook() throws Exception {
            try {
                String fileType = fileName.substring(fileName.lastIndexOf("."));
                if (excel2003L.equals(fileType)) {
                    return new HSSFWorkbook(inputStream); //2003-
                } else if (excel2007U.equals(fileType)) {
                    return new XSSFWorkbook(inputStream); //2007+
                } else {
                    throw new Exception();
                }
            } catch (Exception e) {
                throw new Exception("解析的文件格式有誤！");
            }
        }
    
        protected abstract void parseTitles(int rowIndex) throws Exception;
    
        protected String getCellStringValue(Cell cell) throws Exception {
            String cellValue = "";
            if (cell == null) {
                return cellValue;
            } else if (cell.getCellType() == Cell.CELL_TYPE_STRING) {
                cellValue = cell.getStringCellValue();
            } else if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
                if (HSSFDateUtil.isCellDateFormatted(cell)) {
                    double d = cell.getNumericCellValue();
                    Date date = HSSFDateUtil.getJavaDate(d);
                    cellValue = simpleDateFormat.format(date);
                } else {
                    cellValue = decimalFormat.format((cell.getNumericCellValue()));
                }
            } else if (cell.getCellType() == Cell.CELL_TYPE_BLANK) {
                cellValue = "";
            } else if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {
                cellValue = String.valueOf(cell.getBooleanCellValue());
            } else if (cell.getCellType() == Cell.CELL_TYPE_ERROR) {
                cellValue = "";
            } else if (cell.getCellType() == Cell.CELL_TYPE_FORMULA) {
                cellValue = cell.getCellFormula();
            }
           
            return cellValue.trim();
        }
    }