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我尝试将单元格值从工作表复制到另一个文件的工作表Apache POI。两个XLSM文件具有相同的列，但顺序不同。我初始化第一个文件如下：

File file = new File(GlobalVariables.XLSM);
FileInputStream inputStream = new FileInputStream(file);
XSSFWorkbook workbook = XSSFWorkbookFactory.createWorkbook(inputStream);
XSSFSheet sheet = workbook.getSheetAt(0);
XSSFRow row = sheet.getRow(recordcount+4);
Cell cell;

之后我在这个文件中设置了一些单元格：

cell = row.getCell(0);
cell.setCellValue(recordcount+1);
cell = row.getCell(2);
originalDir = originalDir.substring(originalDir.indexOf('\\', 2));
cell.setCellValue(originalDir);

第二个文件，我需要从中将值复制到第一个文件：

File prevfile = new File(PrevResXLS);
FileInputStream prevInputStream = new FileInputStream(prevfile);
XSSFWorkbook prevworkbook = XSSFWorkbookFactory.createWorkbook(prevInputStream);
XSSFSheet prevsheet = prevworkbook.getSheetAt(0);
XSSFRow prevrow = prevsheet.getRow(0);
Cell prevCell;

有一个标志，在这种情况下设置为 1，因此满足条件。我正在寻找以前的值，它属于同一个文件，所以需要复制到第一个。

if(GlobalVariables.PrevRES != 0){
    File prevfile = new File(PrevResXLS);
    FileInputStream prevInputStream = new FileInputStream(prevfile);
    XSSFWorkbook prevworkbook = XSSFWorkbookFactory.createWorkbook(prevInputStream);
    XSSFSheet prevsheet = prevworkbook.getSheetAt(0);
    XSSFRow prevrow = prevsheet.getRow(0);
    Cell prevCell;

    try {
        for (Row r : prevsheet) {
            if (r.getRowNum() == 0) continue;
            if (r.getCell(1).toString().equals(trans_filename)) {
                cell = prevrow.getCell(21);
                cell.setCellValue(r.getCell(21 - 13).toString());
                cell = prevrow.getCell(22);
                cell.setCellValue(r.getCell(22 - 13).toString());
                cell = prevrow.getCell(23);
                cell.setCellValue(r.getCell(23 - 13).toString());
                cell = prevrow.getCell(24);
                cell.setCellValue(r.getCell(24 - 13).toString());
                cell = prevrow.getCell(25);
                cell.setCellValue(r.getCell(25 - 13).toString());
                cell = prevrow.getCell(26);
                cell.setCellValue(r.getCell(26 - 13).toString());
                cell = prevrow.getCell(27);
                cell.setCellValue(r.getCell(27 - 13).toString());
                cell = prevrow.getCell(28);
                cell.setCellValue(r.getCell(28 - 13).toString());
                cell = prevrow.getCell(29);
                cell.setCellValue(r.getCell(29 - 13).toString());
                cell = prevrow.getCell(30);
                cell.setCellValue(r.getCell(30 - 13).toString());
                cell = prevrow.getCell(31);
                cell.setCellValue(r.getCell(31 - 13).toString());
                cell = prevrow.getCell(32);
                cell.setCellValue(r.getCell(32 - 13).toString());
                cell = prevrow.getCell(33);
                cell.setCellValue(r.getCell(33 - 13).toString());
            }
        }
        prevInputStream.close();
    } catch (NullPointerException e) {
        System.out.print("NPE");
    }
} 
    FileOutputStream fileOut=new FileOutputStream(GlobalVariables.XLSM);
    workbook.write(fileOut);
    fileOut.close();

执行成功，用新值修改文件，但没有将任何内容复制到第一个文件。

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