In one of my project,I need extract from an text file ,excel content.When extract excel from that file and process it with Apache POI ,I have the following error:
"java.io.IOException: Invalid header signature; read 0x210000778C09010A, expected 0xE11AB1A1E011CFD0
at org.apache.poi.poifs.storage.HeaderBlockReader.<init>(HeaderBlockReader.java:120)"
Why?