当session中用户名不存在时转向login页面怎么做（使用Struts1标签）

AbsurdLife 2012-02-07 11:13:31

我直接使用forward标签结果报如下异常：

ServletException in:/page/jsp/template/template2.jsp] javax.servlet.jsp.JspException: Exception forwarding for name GotoLoginPageWhenSessionFailed: java.lang.IllegalStateException: Error: Attempt to clear a buffer that's already been flushed' javax.servlet.ServletException: javax.servlet.jsp.JspException: Exception forwarding for name GotoLoginPageWhenSessionFailed: java.lang.IllegalStateException: Error: Attempt to clear a buffer that's already been flushed at org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:855) at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:784) at org.apache.jsp.page.jsp.template.template2_jsp._jspService(template2_jsp.java:234) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:384) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:687) at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:590) at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:505) at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968) at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:614) at org.apache.struts.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:138) at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:152) at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:138) at org.apache.struts.taglib.tiles.InsertTag.doInclude(InsertTag.java:756) at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:881) at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:473) at org.apache.jsp.page.jsp.task.tododone.index_jsp._jspx_meth_tiles_005finsert_005f0(index_jsp.java:128) at org.apache.jsp.page.jsp.task.tododone.index_jsp._jspService(index_jsp.java:68) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:384) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:687) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:469) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:403) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301) at org.apache.struts.chain.commands.servlet.PerformForward.handleAsForward(PerformForward.java:113) at org.apache.struts.chain.commands.servlet.PerformForward.perform(PerformForward.java:96) at org.apache.struts.chain.commands.AbstractPerformForward.execute(AbstractPerformForward.java:54) at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51) at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190) at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304) at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190) at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913) at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449) at javax.servlet.http.HttpServlet.service(HttpServlet.java:690) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:75) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) 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:228) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445) at java.lang.Thread.run(Thread.java:619) Caused by: javax.servlet.jsp.JspException: Exception forwarding for name GotoLoginPageWhenSessionFailed: java.lang.IllegalStateException: Error: Attempt to clear a buffer that's already been flushed at org.apache.struts.taglib.logic.ForwardTag.doForward(ForwardTag.java:127) at org.apache.struts.taglib.logic.ForwardTag.doEndTag(ForwardTag.java:107) at org.apache.jsp.page.jsp.template.template2_jsp._jspx_meth_logic_005fforward_005f0(template2_jsp.java:398) at org.apache.jsp.page.jsp.template.template2_jsp._jspx_meth_logic_005fnotPresent_005f0(template2_jsp.java:370) at org.apache.jsp.page.jsp.template.template2_jsp._jspService(template2_jsp.java:134) ... 61 more

具体该如何处理请大家教我。

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