JSF 2.0简单的登录页面 [英] JSF 2.0 Simple login page

问题描述

我需要限制访问应用程序的一部分。为了访问那一部分，用户需要登录。我有一个表在我的数据库称为用户，用用户名和密码散列，以及一个包含两个输入和一个提交登录表单。但是，我不知道我应该使用哪些类/ mathids登录用户（我假设有在JSF此功能的支持）。此外，据我知道，我需要编辑我的web.xml中支持的鉴别。可能有人提出一个典型的解决方案，而我需要，以获得该功能（链接，价值大大AP preciated的教程）做的一般步骤是什么？

I need to restrict the access to a part of the application. In order to access that part, user needs to log in. I have a table in my database called User, with usernames and hashed passwords and a login form that consists of two inputs and a submit. However, I don't know which classes/mathids should I use to log in the user (I assume that there is a support for this functionality in jsf). Also, as far as I know, I need to edit my web.xml to support the authentification. Could someone propose a typical solutions and general steps that I need to do in order to get that functionality (links, tutorials of a value greatly appreciated)?

我也想知道我怎么限制访问如果人不在，所以当在直接链接到一个页面的用户类型，他将被重定向到一个主登录页面登录另一个页面。

i also wonder how do I limit the access to another page if the person is not logged in so when the user types in the direct link to a page, he will be redirected to a main login page.

感谢您事先的任何帮助。
GREM。

Thanks in advance for any help. Grem.

推荐答案

您可以使用Servlet 3.0中引入了HttpServletRequest的API：

You could use the HttpServletRequest API introduced in Servlet 3.0:

    /**
     * Performs authentication via HttpServletRequest API
     */
    public String login(String username, String password) throws IOException {
        try {
            getRequest().login(username, password);
            this.user = userDao.find(username);
        } catch (ServletException e) {
            JsfUtil.addErrorMessage(JsfUtil.getStringResource("loginFailed"));
            return null;
        }
        return "/index?faces-redirect=true";
    }

    public String logout() throws ServletException {
        this.user = null;
        FacesContext.getCurrentInstance().getExternalContext().invalidateSession();
        if (isAuthenticated())
           getRequest().logout();
        return "logout";
    }

    public boolean isAuthenticated() {
        return getRequest().getUserPrincipal() != null;
    }

    public static HttpServletRequest getRequest() {
        Object request = FacesContext.getCurrentInstance().getExternalContext().getRequest();
        return request instanceof HttpServletRequest
                ? (HttpServletRequest) request : null;
    }

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