谢谢提示
但是我现在改了还是不行帮忙在看看代码错误信息如下
JSP页面:
Stringpath=request.getContextPath（）;
StringbasePath=request.getScheme（）+”:”+request.getServerName（）+”:”+request.getServerPort（）+path+””;
%>
-W3CDTDHTML4.01TransitionalEN”>
“>
MyJSPadvrub.jspstartingpage<title>
<p></p>
<h1>
<br>提出技术难点
<h1>
</h1></h1><p>姓名:</p>
<p>技术难点:</p>
<p>serv类:<br>1.<br>packagecom.yourcompany.serv;</p>
<p>publicclassAdvrub{<br>privateintid;<br>privateStringusername;<br>privateStringcontene;</p>
<p>publicintgetId（）{<br>returnid;<br>}<br>publicvoidsetId（intid）{<br>this.id=id;<br>}<br>publicStringgetUsername（）{<br>returnusername;<br>}<br>publicvoidsetUsername（Stringusername）{<br>this.username=username;<br>}<br>publicStringgetContene（）{<br>returncontene;<br>}<br>publicvoidsetContene（Stringcontene）{<br>this.contene=contene;<br>}</p>
<p>}</p>
<p>2.<br>packagecom.yourcompany.serv;</p>
<p>importjava.sql.Connection;<br>importjava.sql.ResultSet;<br>importjava.sql.SQLException;<br>importjava.sql.Statement;</p>
<p>importjavax.naming.InitialContext;<br>importjavax.naming.NamingException;<br>importjavax.sql.DataSource;</p>
<p>publicclassAdvrubManager{<br>publicintadvrub（Stringusername,Stringcontent）throwsSQLException{<br>得到数据源<br>DataSourceds=null;</p>
<p>try{<br>InitialContextctx;<br>ctx=newInitialContext（）;<br>ds=（DataSource）ctx.lookup（”java:compenvjdbcpgsql”）;<br>}catch（NamingExceptione）{<br>e.printStackTrace（）;<br>}</p>
<p>intmaxId=0;<br>Connectionconn=ds.getConnection（）;<br>Statementstmt=conn.createStatement（）;<br>ResultSetrs=stmt.executeQuery（”selectmax（id）fromadvrub”）;<br>if（rs.next（））<br>maxId=rs.getInt（1）;</p>
<p>maxId++;</p>
<p>StringBuffersb=newStringBuffer（）;<br>sb.append（”insertintoadvrubvalues（”）;<br>sb.append（maxId）;<br>sb.append（”,”）;<br>sb.append（username）;<br>sb.append（”,”）;<br>sb.append（content）;<br>sb.append（”）”）;</p>
<p>运行insert语句，插入表中一条记录，rtn将返回1<br>intrtn=stmt.executeUpdate（sb.toString（））;<br>if（rtn==1）插入数据成功<br>returnmaxId;<br>else插入数据失败<br>return-1;<br>}</p>
<p>}</p>
<p>action:<br>packagecom.yourcompany.struts.action;</p>
<p>importjava.sql.SQLException;</p>
<p>importjavax.servlet.http.HttpServletRequest;<br>importjavax.servlet.http.HttpServletResponse;</p>
<p>importorg.apache.struts.action.ActionForm;<br>importorg.apache.struts.action.ActionForward;<br>importorg.apache.struts.action.ActionMapping;<br>importorg.apache.struts.actions.MappingDispatchAction;</p>
<p>importcom.yourcompany.struts.form.AdvrubForm;<br>importcom.yourcompany.serv.AdvrubManager;<br>importcom.yourcompany.serv.Advrub;</p>
<p>publicclassAdvrubActionextendsMappingDispatchAction{</p>
<p>publicActionForwardadvrub（ActionMappingmapping,ActionFormform,<br>HttpServletRequestrequest,HttpServletResponseresponse）throwsSQLException{</p>
<p>AdvrubFormsf=（AdvrubForm）form;</p>
<p>AdvrubManagersm=newAdvrubManager（）;</p>
<p>sm.advrub（sf.getUsername（）,sf.getContten（））;</p>
<p>returnmapping.findForward（”success”）;</p>
<p>}</p>
<p>}</p>
<p>form:</p>
<p>packagecom.yourcompany.struts.form;</p>
<p>importjavax.servlet.http.HttpServletRequest;</p>
<p>importorg.apache.struts.action.ActionErrors;<br>importorg.apache.struts.action.ActionMapping;</p>
<p>publicclassAdvrubFormextendsActionForm{</p>
<p>privateintid;<br>privateStringusername;<br>privateStringcontent;</p>
<p>publicintgetId（）{<br>returnid;<br>}</p>
<p>publicvoidsetId（intid）{<br>this.id=id;<br>}</p>
<p>publicStringgetUsername（）{<br>returnusername;<br>}<br>publicvoidsetUsername（Stringusername）{<br>this.username=username;<br>}</p>
<p>publicStringgetContten（）{<br>returncontent;<br>}<br>publicvoidsetContent（Stringcontene）{<br>this.content=content;<br>}<br>}</p>
<p>错误信息：<br>2007-10-2414:20:30org.apache.struts.util.RequestUtilscreateActionForm<br>警告:NoFormBeanConfigfoundunderAdvrubForm<br>2007-10-2414:20:30org.apache.struts.action.RequestProcessorprocessException<br>警告:UnhandledExceptionthrown:classjava.lang.NullPointerException<br>2007-10-2414:20:30org.apache.catalina.core.StandardWrapperValveinvoke<br>严重:Servlet.service（）forservletactionthrewexception<br>java.lang.NullPointerException<br>atcom.yourcompany.struts.action.AdvrubAction.Advrub（AdvrubAction.java:31）<br>atsun.reflect.NativeMethodAccessorImpl.invoke0（NativeMethod）<br>atsun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:39）<br>atsun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:25）<br>atjava.lang.reflect.Method.invoke（Method.java:585）<br>atorg.apache.struts.actions.DispatchAction.dispatchMethod（DispatchAction.java:274）<br>atorg.apache.struts.actions.DispatchAction.execute（DispatchAction.java:194）<br>atorg.apache.struts.actions.MappingDispatchAction.execute（MappingDispatchAction.java:169）<br>atorg.apache.struts.action.RequestProcessor.processActionPerform（RequestProcessor.java:419）<br>atorg.apache.struts.action.RequestProcessor.process（RequestProcessor.java:224）<br>atorg.apache.struts.action.ActionServlet.process（ActionServlet.java:1194）<br>atorg.apache.struts.action.ActionServlet.doPost（ActionServlet.java:432）<br>atjavax.servlet.http.HttpServlet.service（HttpServlet.java:710）<br>atjavax.servlet.http.HttpServlet.service（HttpServlet.java:803）<br>atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:290）<br>atorg.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）<br>atorg.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:233）<br>atorg.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:175）<br>atorg.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:128）<br>atorg.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:102）<br>atorg.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:109）<br>atorg.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:263）<br>atorg.apache.coyote.http11.Http11Processor.process（Http11Processor.java:844）<br>atorg.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process（Http11Protocol.java:584）<br>atorg.apache.tomcat.util.net.JIoEndpoint$Worker.run（JIoEndpoint.java:447）<br>atjava.lang.Thread.run（Thread.java:595）</p>
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