apache poi将一种样式应用于不同的工作簿

Question

我试图将一种单元格样式应用于不同的woekbooks。它运行良好，当我将它应用到第一个工作簿时，但是当我试图用第二个和下一个工作簿来完成时 - 没有应用样式并引发以下异常。

Exception in thread "Thread-3" java.lang.IllegalArgumentException: This Style does not belong to the supplied Workbook Stlyes Source. Are you trying to assign a style from one workbook to the cell of a differnt workbook? 
    at org.apache.poi.xssf.usermodel.XSSFCellStyle.verifyBelongsToStylesSource(XSSFCellStyle.java:118) 
    at org.apache.poi.xssf.usermodel.XSSFCell.setCellStyle(XSSFCell.java:500) 
    at CoreLayer.ExportManager.ExcelExproter.applyStyle(ExcelExproter.java:224) 
    at CoreLayer.ExportManager.ExcelExproter.groupSchedule(ExcelExproter.java:47) 
    at UILayer.ExportDialog$ExportWorker.run(ExportDialog.java:111) 
    at java.lang.Thread.run(Thread.java:722) 

下面的代码被用于：

public void professorSchedule(Professor professor) { 
     Workbook wb = new XSSFWorkbook(); 
     Sheet sheet = wb.createSheet(TextConstants.SCHEDULE); 
     String safeName = WorkbookUtil.createSafeSheetName(professor.toString() + ".xlsx"); 

     LinkedHashMap<ScheduleSlot, Lesson> professorSchedule = data.getSchedule().getProfessorSchedule(professor); 
     fillProfessorSchedule(sheet, professorSchedule); 

     applyStyle(wb, sheet); 
     try { 
      FileOutputStream fileOutputStream = new FileOutputStream(settings.getSchedulesPath() + safeName); 
      wb.write(fileOutputStream); 
      fileOutputStream.close(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
    } 

    private void applyStyle(Workbook wb, Sheet sheet) { 
     CellStyle style = wb.createCellStyle(); 
     style.setWrapText(true); 

     int columnNumber = 0; 
     sheet.autoSizeColumn(columnNumber); 
     for (Row row : rows) { 
      for (Cell cell : row) { 
       cell.setCellStyle(style); 
       sheet.setColumnWidth(columnNumber++, 5000); 
      } 
     } 
    } 

谢谢大家提前！

Answer 1

您不能这样做，CellStyle对象特定于一个工作簿。它们是相当深刻的对象，并且大部分风格都保存在工作簿中，因此您不能重复使用。你甚至会得到一个有用的例外，它向你解释了这一点！

您需要做的是使用cloneStyleFrom(CellStyle)方法来复制样式的细节。例如：

Workbook wb = WorkbookFactory.create(new File("existing.xls")); 
CellStyle origStyle = wb.getCellStyleAt(1); // Or from a cell 

Workbook newWB = new XSSFWorkbook(); 
Sheet sheet = newWB.createSheet(); 
Row r1 = sheet.createRow(0); 
Cell c1 = r1.createCell(0); 

CellStyle newStyle = newWB.createCellStyle(); 
newStyle.cloneStyleFrom(origStyle); 
c1.setCellStyle(newStyle); 

newWB.write(new FileOutpuStream("new.xlsx"));