JSF 中的条件重定向

问题描述

限时删除！！

是否有内置机制可以有条件地重定向到另一个视图?如果他/她已经登录，我希望用户从登录页面重定向到主页".

is there a build-in mechanism to conditionally redirect to another view? I want the user to be redirected from the login page to the "home page" if he/she is already logged in.

我已经有两种基本方法，但对于第一种我不知道如何实现，第二种是一种肮脏的解决方法.

I already have two basic approaches, but for the first I have no idea how to achieve and the second is sort of a dirty workaround.

1. 添加 <meta http-equiv="Refresh" content="0; URL=home.jsf"/> 并让它有条件地呈现(EL : #{login.loggedIn})
2. 添加一个 <h:panelGroup/> ，它也将有条件地呈现，包含一些执行重定向的 JavaScript.

1. Add <meta http-equiv="Refresh" content="0; URL=home.jsf" /> and let it be rendered conditionally (EL : #{login.loggedIn})
2. Add a <h:panelGroup /> which will also be conditionally rendered, containing some JavaScript doing the redirect.

有没有办法实现 1 甚至是另一种更优雅的解决方案?:-)

Is there a way to achieve 1 or even another, more elegant solution? :-)

谢谢

推荐答案

你可以使用 为此.

You could use <f:event type="preRenderView"> for this.

例如

<f:event type="preRenderView" listener="#{login.checkAlreadyLoggedin}" />

与

public void checkAlreadyLoggedin() throws IOException {
    if (isLoggedIn()) {
        ExternalContext ec = FacesContext.getCurrentInstance().getExternalContext();
        ec.redirect(ec.getRequestContextPath() + "/home.xhtml");
    }
}

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