在过去的几天里,我一直在为网络应用程序的登录部分而苦苦挣扎。我已经可以使用 tomcat 上的 JDBCRealm 成功验证用户身份(通过从 sql 服务器数据库读取用户)。现在我想发送某种反馈当用户的帐户被阻止或凭据不正确时,这就是我现在陷入困境的地方。
我想用这个:
try {
request.login(request.getParameter("user"), request.getParameter("pass"));
} catch (ServletException se) {
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Wrong Username/Password combination"));
log(se.getMessage());
}
但 FacesContext.getCurrentInstance() 总是返回 null..
经过一些研究后,我发现请求必须来自位于 /faces 中的页面,以便调用 FacesServlet 并初始化 FacesContext(至少我是这么理解的)。
因此,我将登录页面移至网页文件夹内名为 faces 的新文件夹中。但现在每次我尝试调用 login.xhtml 页面时,都会收到此错误:
/login.xhtml Not Found in ExternalContext as a Resource
这是堆栈跟踪:
com.sun.faces.context.FacesFileNotFoundException: /login.xhtml Not Found in ExternalContext as a Resource
at com.sun.faces.facelets.impl.DefaultFaceletFactory.resolveURL(DefaultFaceletFactory.java:232)
at com.sun.faces.facelets.impl.DefaultFaceletFactory.resolveURL(DefaultFaceletFactory.java:273)
at com.sun.faces.facelets.impl.DefaultFaceletFactory.getFacelet(DefaultFaceletFactory.java:201)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.buildView(FaceletViewHandlingStrategy.java:764)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:100)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:410)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:964)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:304)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
即使我直接在浏览器中输入 URL,也会收到此错误。
我将 Netbeans 7.1 与 Apache Tomcat 7 一起使用(顺便说一句,这很痛苦,因为我遇到了很多 PermGen 内存不足异常 -.-)
任何有关如何解决此问题的帮助将不胜感激。