POI jar包和读取Excel的Demo(xls格式和xlsx格式)

POIjar包和读取Excel的Demo(xls格式和xlsx格式),需要引入的jar包有xmlbeans-2.6.0.jar,poi-3.9-20121203.jar,poi-excelant-3.9-20121203.jar,poi-ooxml-3.9-20121203.jar,poi-ooxml-schemas-3.9-20121203.jar,dom4j-1.6.1.jar