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我之前问过我的问题,但我不清楚。所以我再次问我的问题,希望有人能理解我。我想为我的应用程序创建一个用户会话。因此,用户必须登录才能访问我的主页。为此,我创建了一个 Bean 和一个过滤器。我使用了JSF HTTP Session Login这个问题的答案来做到这一点。但userManager过滤器中的始终为空。我不知道如何将已连接用户的值放入此行。

UserManager userManager = (UserManager) req.getSession().getAttribute("userManager");

这里是过滤器。

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse res = (HttpServletResponse) response;
UserManager userManager = (UserManager) req.getSession().getAttribute("userManager");       
String loginURL = req.getContextPath() + "/index.jsf";

if (userManager == null && !userManager.isLoggedIn() && !req.getRequestURI().equals(loginURL)) {

    res.sendRedirect(loginURL);

} else {

    res.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // HTTP 1.1.
    res.setHeader("Pragma", "no-cache"); // HTTP 1.0.
    res.setDateHeader("Expires", 0); // Proxies.

    chain.doFilter(request, response);

}

当我把这个条件放在 if 中时!userManager.isLoggedIn(),我有一个标记,上面写着:

空指针访问:变量 userManager 在此位置只能为空,1 个快速修复可用,将 @SuppressWarnings 'null' 添加到 'doFilter()'

我试图添加它并执行,但出现错误java.lang.NullPointerException。我是JSF的初学者。拜托我需要你的帮忙。

 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/jsf-formulaire].[Faces Servlet]] "Servlet.service()" pour la servlet Faces Servlet a généré une exception: java.lang.NullPointerException
at com.citech.pointage.fe.bean.filters.SessionFilter.doFilter(SessionFilter.java:61) [:]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:274) [:6.1.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) [:6.1.0.Final]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [:6.1.0.Final]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [:6.1.0.Final]
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:181) [:6.1.0.Final]
at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.event(CatalinaContext.java:285) [:1.1.0.Final]
at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.invoke(CatalinaContext.java:261) [:1.1.0.Final]
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:88) [:6.1.0.Final]
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:100) [:6.1.0.Final]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:159) [:6.1.0.Final]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [:6.1.0.Final]
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) [:6.1.0.Final]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [:6.1.0.Final]
at org.jboss.web.tomcat.service.request.ActiveRequestResponseCacheValve.invoke(ActiveRequestResponseCacheValve.java:53) [:6.1.0.Final]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362) [:6.1.0.Final]
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [:6.1.0.Final]
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:654) [:6.1.0.Final]
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:951) [:6.1.0.Final]
at java.lang.Thread.run(Unknown Source) [:1.6.0_03]
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1 回答 1

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你的情况应该是:

if ((userManager == null || !userManager.isLoggedIn()) && 
    !req.getRequestURI().equals(loginURL)) // first && replaced by ||

现在您可以继续使用JSF HTTP Session Login了。验证用户的另一个选项是使用来自 jsf 元数据的 PreRenderView 事件,只需将其添加到您的页面中:

<f:metadata>
  <f:event type="preRenderView" listener="#{securityMB.checkLogIn}" />
</f:metadata>

还有你的托管bean:

@ManagedBean(name = "securityMB")
@RequestScoped
public class SecurityBean {
  @ManagedProperty(value = "#{userManager}")
  private UserManager userManager;
  String loginURL = "/index.jsf";
  public void checkLogIn() {
  if (userManager == null || !userManager.isLoggedIn()) {
    FacesContext.getCurrentInstance().getExternalContext().redirect(loginURL);
  }
  //getter and setter (userManager)
}
于 2013-07-03T19:41:46.203 回答