Thanks for your posting and using the Aspose.Cells for Java.
Please download the latest version:
Aspose.Cells for Java 7.1.0
and replace the old aspose.cells jar file with the newer one: Aspose.Cells for Java v18.104.22.168
It seems the fonts used by your chinese characters cannot be found
automatically by our components. Please use
Cells.setFontDir()/setFontDirs()/setFontFiles() to specify the correct
font path so those characters can be rendered properly.
If the problem still does not resolve, then provide us your source xls/xlsx file.
It’s good to know, your problem is resolved now. Thanks for posting your sample code.
If you have any other questions, feel free to post here. We will help you asap.