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。 我正在经历更新发生的时间..

对于每个单元格，我根据作为休耕的更改运行更新

  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

在所有更新操作完成后关闭excel，打开excel一次。

示例：

      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();
    }