0

我有一个注销链接，如下所示：

    <h:form>
       <div>
         <h:commandButton value="Logout" action="#{Bean.logOut}" />
       </div>
    </h:form>

以及对应的注销方法：

 public String logOut()throws Exception{
        FacesContext facesContext = FacesContext.getCurrentInstance();
        HttpSession httpSession = (HttpSession)facesContext.getExternalContext().getSession(false);
        httpSession.invalidate();
        return "pretty:index?faces-redirect=true";
    }

当我单击注销按钮时，它工作正常，但是当我尝试转发登录页面时出现接缝，它不起作用，并且出现类似错误

java.lang.IllegalStateException: Cannot call sendRedirect() after the response has been committed
at org.apache.catalina.connector.ResponseFacade.sendRedirect(ResponseFacade.java:483)
at javax.servlet.http.HttpServletResponseWrapper.sendRedirect(HttpServletResponseWrapper.java:138)
at javax.servlet.http.HttpServletResponseWrapper.sendRedirect(HttpServletResponseWrapper.java:138)
at com.test.Bean.onErrorHome(Bean.java:262)
at com.test.Bean.<init>(Bean.java:51)
at com.test.service.BeanList.<init>(BeanList.java:84)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at java.lang.Class.newInstance0(Class.java:374)
at java.lang.Class.newInstance(Class.java:327)
at com.sun.faces.mgbean.BeanBuilder.newBeanInstance(BeanBuilder.java:188)
at com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:102)
at com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:409)
at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:269)
at com.sun.faces.el.ManagedBeanELResolver.resolveBean(ManagedBeanELResolver.java:244)
at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:116)
at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:72)
at org.apache.el.parser.AstValue.getTarget(AstValue.java:94)
at org.apache.el.parser.AstValue.getType(AstValue.java:82)
at org.apache.el.ValueExpressionImpl.getType(ValueExpressionImpl.java:176)
at com.ocpsoft.pretty.faces.util.FacesElUtils.getExpectedType(FacesElUtils.java:50)
at com.ocpsoft.pretty.faces.beans.ParameterInjector.injectQueryParams(ParameterInjector.java:125)
at com.ocpsoft.pretty.faces.beans.ParameterInjector.injectParameters(ParameterInjector.java:55)
at com.ocpsoft.pretty.faces.event.PrettyPhaseListener.afterPhase(PrettyPhaseListener.java:102)
at com.sun.faces.lifecycle.Phase.handleAfterPhase(Phase.java:189)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:107)
at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:116)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:145)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:690)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:477)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:402)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329)
at com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:137)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:200)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)

我该如何解决这个问题。请帮我 。提前致谢 。

4

2 回答 2

1

查看在sendRedirect错误时刻调用的堆栈跟踪：

at javax.servlet.http.HttpServletResponseWrapper.sendRedirect(HttpServletResponseWrapper.java:138)
at com.test.Bean.onErrorHome(Bean.java:262)
at com.test.Bean.<init>(Bean.java:51)
at com.test.service.BeanList.<init>(BeanList.java:84)

您在注销后重定向到的页面显然是BeanList在其构造函数中引用另一个Bean实例，该实例是在其构造函数onErrorHome()方法被调用中手动构造的，即调用HttpServletResponse#sendRedirect().

我不确定你们都在那里做什么，但考虑到这个问题，它肯定做得不对。您基本上是在页面忙于生成 HTML 输出时尝试重定向。该 HTML 的一部分已经发送到网络浏览器（即响应已经提交）。

你有 2 个选择：

  1. 将该逻辑移至servlet 过滤器。

  2. 在事件期间而不是在构造函数中执行onErrorHome()作业。preRenderView

    <f:event type="preRenderView" listener="#{beanList.init}" />

    在 JSF 开始呈现/生成/发送 HTML 输出之前调用此方法，因此您可以自由地将响应更改为不同的目标，而不会冒IllegalStateException: response already committed错误的风险。

也可以看看：

于 2013-06-24T12:10:51.100 回答
-1

At end of function you can call getSession again with true value for re create the session.

     public String logOut()throws Exception{
            FacesContext facesContext = FacesContext.getCurrentInstance();
            HttpSession httpSession = (HttpSession)facesContext.getExternalContext().getSession(false);
            httpSession.invalidate();
            return "pretty:index?faces-redirect=true";
            httpSession = (HttpSession)facesContext.getExternalContext().getSession(true);
            return "pretty:index?faces-redirect=true";
        }
于 2013-09-09T00:40:17.067 回答