Java export excel line break

When export excel, if the original contains characters \ n characters, excel generated distortion generated _0040_ words, if the \ n is a replacement, excel not recognized as newline

excel recognized char (10) as line breaks:

 

　　actDesc = actDesc.trim().replaceAll("\n", String.valueOf((char)10));

　　// ------------------------- case do not replace, or recommended in "String.valueOf ((char) 10)" add back " "---------------------------------------

　　dataMap.put(key,"(阶段) (" +reportInfo.get("startDate") + " ～ " + reportInfo.get("startDate") + ") "  + String.valueOf((char)10) + "");