XSSFWorkbook读取excel2007

我使用XSSFWorkbook操作excel2007的时候怎么报找不到类，是不是少了包？
严重: Servlet.service() for servlet StaffIpRestrictServlet threw exception
java.lang.ClassNotFoundException: org.openxmlformats.schemas.spreadsheetml.x2006.main.CTSheet
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
at com.ztesoft.sysw.service.StaffIpRestrictServlet.filePathToArrayListEx(StaffIpRestrictServlet.java:194)
at com.ztesoft.sysw.service.StaffIpRestrictServlet.doGet(StaffIpRestrictServlet.java:85)
at com.ztesoft.sysw.service.StaffIpRestrictServlet.doPost(StaffIpRestrictServlet.java:50)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:864)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1665)
at java.lang.Thread.run(Thread.java:619)