求助！poi实现word预览 抛出classNOTfound异常

严重: Servlet.service() for servlet MVC threw exception
java.lang.ClassNotFoundException: org.apache.poi.hwpf.extractor.WordExtractor
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1647)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1493)
at com.runsi.notice.web.TransmitFile.yuLan(TransmitFile.java:90)
at com.runsi.notice.web.NoticeController.yulan(NoticeController.java:299)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.frameworkset.web.servlet.handler.annotations.HandlerMethodInvoker.doInvokeMethod(HandlerMethodInvoker.java:261)
at org.frameworkset.web.servlet.handler.annotations.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
at org.frameworkset.web.servlet.handler.HandlerUtils.invokeHandlerMethod(HandlerUtils.java:2564)
at org.frameworkset.web.servlet.handler.annotations.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:298)
at org.frameworkset.web.servlet.handler.annotations.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:274)
at org.frameworkset.web.servlet.DispatchServlet.doDispatch(DispatchServlet.java:792)
at org.frameworkset.web.servlet.DispatchServlet.doService(DispatchServlet.java:649)
at org.frameworkset.web.servlet.DispatchServlet.processRequest(DispatchServlet.java:421)
at org.frameworkset.web.servlet.DispatchServlet.doGet(DispatchServlet.java:1593)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
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 com.frameworkset.common.filter.CharsetEncodingFilter.doFilter(CharsetEncodingFilter.java:93)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
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.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:722)



Word poi 异常 预览 web
[解决办法]
找不到类，明显的缺少jar包啊，，我没用过poi ，可以网上看看别人是怎么实现的
http://www.cnblogs.com/hongten/archive/2012/02/22/java2poi.html
jar包：
http://download.csdn.net/detail/lanlei226/731405


[解决办法]
jar包版本不对么
[解决办法]
poi-scratchpad-3.9-20121203.jar

是你自己没把包放进去吧
poi3.9的压缩包里一眼就看到了