java - JAVA - Apache POI 批量修改 Excel 文件

Question

我正在运行一个修改大型 excel 文件的 java 应用程序。而且我正在经历需要进行更新的时间..

对于每个单元格，我正在根据更改运行更新作为休耕

  public boolean updateCellData(ColumnName, RowNum, Data){
    FileInputStream fis = new FileInputStream(path);
        Workbook    workbook = WorkbookFactory.create(fis);

        row =  getRow(rowNum-1);
            if (row == null){
                row = sheet.createRow(rowNum-1);
            }
            cell = row.getCell(colNum);
            if (cell == null){
                cell = row.createCell(colNum);
            }
            cell.setCellValue(data);
            fileOut = new FileOutputStream(path);
            workbook.write(fileOut);
            fileOut.close();
    }

我可以对我的代码进行任何优化吗？

Answer 1

打开excel一次，完成所有更新操作后关闭excel。

例子 ：

      FileInputStream fis =null;
     Workbook workbook=null;
    public void openWorkbook(){
         fis = new FileInputStream(path);
         workbook = WorkbookFactory.create(fis);
    }

    public boolean updateCellData(ColumnName, RowNum, Data){

            row =  getRow(rowNum-1);
                if (row == null){
                    row = sheet.createRow(rowNum-1);
                }
                cell = row.getCell(colNum);
                if (cell == null){
                    cell = row.createCell(colNum);
                }
                cell.setCellValue(data);
      }

    public void closeWorkbook(){
        fileOut = new FileOutputStream(path);
        workbook.write(fileOut);
        fileOut.close();
    }