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这是我使用的模板index.xhtml：

<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:ui="http://java.sun.com/jsf/facelets">
<h:head>
    <title><ui:insert name="title">Default title</ui:insert></title>
    <h:outputStylesheet library="default" name="css/style.css" />
</h:head>
<h:body>
    <div id="wrapper" style="width: 800px; align: center">
        <div id="header">
            <div style="float: left">
                <h:graphicImage library="default"
                    name="img/032-ivan-the-terrible-theredlist.jpg" />
            </div>
            <h:form id="loginForm" rendered="#{sessionScope.user == null}">
                    Username: <h:inputText id="username"
                    value="#{userController.user.username}" />
                    Password: <h:inputSecret id="password"
                    value="#{userController.user.password}" />
              <h:commandButton value="Login" action="#{userController.login}" />
            </h:form>
            <h:commandButton value="Logout" action="#{userController.logout}"
                rendered="#{sessionScope.user != null}" />
            <h:outputLink target="register.xhtml"
                rendered="#{sessionScope.user == null}">Register</h:outputLink>
            <h:outputText rendered="#{sessionScope.user != null}"
                value="You are logged in as #{sessionScope.user.username}" />
        </div>
        <div id="menu" style="clear: both">Menu</div>
        <div id="content">
            <ui:insert name="content">Default content</ui:insert>
        </div>
        <div id="footer">Footer</div>
    </div>
</h:body>
</html>

这是用户控制器。注册和登录工作正常 - 但注销不会为我的生活工作。

@ManagedBean
@ViewScoped
public class UserController {

    // http://stackoverflow.com/a/10691832/281545
    private User user;
    @EJB // do not inject stateful beans !
    private UserService service;

    public User getUser() {
        return user;
    }

    @PostConstruct
    void init() {
        // http://stackoverflow.com/questions/3406555/why-use-postconstruct
        user = new User();
    }

    public String login() {
        FacesContext context = FacesContext.getCurrentInstance();
        try {
            System.out.println("Pass :" + user.getPassword());
            user = service.find(user.getUsername(), user.getPassword());
            context.getExternalContext().getSessionMap().put("user", user);
            return "/index.xhtml?faces-redirect=true";
        } catch (NoResultException e) {
            context.addMessage(null, new FacesMessage(
                FacesMessage.SEVERITY_ERROR, "Unknown login, please try again",
                null));
            return null;
        }
    }

    public String register() {
        FacesContext context = FacesContext.getCurrentInstance();
        user = service.register(user);
        if (user.getIduser() == 0) {
            context.addMessage(null, new FacesMessage(
                FacesMessage.SEVERITY_ERROR, "Registration failed", null));
            return null;
        }
        context.getExternalContext().getSessionMap().put("user", user);
        return "/index.xhtml?faces-redirect=true";
    }

    public String logout() {
        FacesContext.getCurrentInstance().getExternalContext()
            .invalidateSession();
        return "/index.xhtml?faces-redirect=true";
    }
}

因此，当登录按钮将我重定向到索引并显示我的登录名并注册将我发送到以新注册用户身份登录的索引时，当我点击注销按钮时，我只能盯着You are logged in as <username>. 应用内只有索引页面和注册页面

编辑：index.xhtml：

<ui:composition template="/WEB-INF/xhtml/template.xhtml"
    xmlns="http://www.w3.org/1999/xhtml"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:ui="http://java.sun.com/jsf/facelets">
    <ui:define name="title">All Times Classics - Welcome</ui:define>
    <ui:define name="content">
        <h1 style="text-align: center">Welcome to All Times Classics</h1>
        You can <a href="register.xhtml">Register</a> if you want to enjoy all
             the goodies we have to offer.
    </ui:define>
</ui:composition>
4

1 回答 1

2

问题是你<h:commandButton> 必须在里面<h:form>才能工作。在这里检查：

<h:form id="loginForm" rendered="#{sessionScope.user == null}">
    Username: <h:inputText id="username" value="#{userController.user.username}" />
    Password: <h:inputSecret id="password" value="#{userController.user.password}" />
    <h:commandButton value="Login" action="#{userController.login}" />
</h:form>
<!-- needs to be enclosed by <h:form> -->
<h:form>
<h:commandButton value="Logout" action="#{userController.logout}"
    rendered="#{sessionScope.user != null}" />
</h:form>

您可以在此处查看解释：未调用 commandButton/commandLink/ajax 操作/侦听器方法或未更新输入值，原因 1。

于 2014-02-07T17:36:46.100 回答