Ajax的请求在struts2中怎么实现跳转

Question

我前台用的ext，所有请求都是Ajax的请求，然后我后台用的struts，配置了一个全局的权限拦截器。如果未登录就自动跳转到登陆界面。也配置了全局的跳转。

/login.jsp

但是因为是Ajax的请求，所以界面并不跳转。但是都可以在后台输出跳转
2010-05-13 17:05:49,281 DEBUG (org.apache.struts2.dispatcher.ServletRedirectResult:57) - Redirecting to finalLocation /graduation/login.jsp
用firedebug也有跳转到login.jsp的一个get方法。
后来想在拦截器里面直接用后台的代码跳转。
HttpServletRequest req = (HttpServletRequest) ctx.get(StrutsStatics.HTTP_REQUEST);
HttpServletResponse resp = (HttpServletResponse) ctx.get(StrutsStatics.HTTP_RESPONSE);
resp.sendRedirect(req.getContextPath()+"/login.jsp");

或者是 req.getRequestDispatcher("/login.jsp").forward(req, resp);
但是都会在后台报错：严重: Servlet.service() for servlet default threw exception
java.lang.IllegalStateException
at org.apache.catalina.connector.ResponseFacade.sendError(ResponseFacade.java:407)
at org.apache.struts2.dispatcher.Dispatcher.sendError(Dispatcher.java:770)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:505)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
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:233)
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:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
请教高手啦、、、、、

Answer 1

由于你的请求都是采用Ajax的, 所以每次发起ajax请求, 虽然拦截器判断出未登录跳转到登录页面, 那么, [b]这次ajax请求的结果就是这个页面(具体的说, 这次请求返回的就是登录页面的源代码),[/b] 所以浏览器不会发生跳转. 通过在请求完成事件处理函数中判断返回的文本是不是登录页面的源码(比如检查返回值中是否包含

用户登录, 这个和登录页面有关了), 如果包含, 则top.location.href='登录页面的url'