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我想使用poi將我的excel文件的所有單元格設置爲某種顏色。但是,我一直在爲空白單元格獲取空指針異常。這是我到目前爲止:excel poi:將前景色應用於空白單元格
HSSFWorkbook workBook = new HSSFWorkbook();
HSSFCellStyle whiteFG = workBook.createCellStyle();
whiteFG.setFillForegroundColor(HSSFColor.AQUA.index);
whiteFG.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
//each row has 20 columns
int numColumns = 20;
for (int colNum = 0 ; colNum < numColumns ; colNum++){
HSSFCell cell = row.getCell((short)colNum);
if (cell != null){
cell.setCellStyle(whiteFG);
}
else if ("".equals(cell.getStringCellValue())){
cell.setCellStyle(whiteFG);
}
else() {
cell.setCellStyle(whiteFG);
}
任何意見,我怎麼可以給空白單元格上色?