Question

struts2 中导入excel

在判断文件类型的时候
public Workbook createWorkBook(InputStream is) throws IOException{
if(excelFileFileName.toLowerCase().endsWith("xls")){
returnnew HSSFWorkbook(is);
}
if(excelFileFileName.toLowerCase().endsWith("xlsx")){
returnnew XSSFWorkbook(is);
}
returnnull;
}
报错：cannot convert from HSSFWorkbook to Workbook

Answer 1

public Workbook createWorkBook(InputStream is) throws IOException{

这个方法的返回值和你实际的返回值不统一啊
returnnew HSSFWorkbook(is);