您的位置: 首页  >  技术问答  >  如何在应用程序上使用新的用户登录名创建新会话?

如何在应用程序上使用新的用户登录名创建新会话?

分类: 技术问答 • 2022-07-23 23:52:41
问题描述：

新用户登录应用程序后，如何在JSF 2.0中创建新会话?

How can I create a new session in JSF 2.0 as soon as a new User logs in on the application?

答

您不需要.精心设计的webapp毫无意义. servletcontainer已经进行了会话管理.只需将已登录的用户放在会话范围内即可.

You don't need to. It makes in well designed webapps no sense. The servletcontainer does already the session management. Just put the logged-in user in the session scope.

@ManagedBean
@RequestScoped
public class LoginController {

    private String username;
    private String password;

    @EJB
    private UserService userService;

    public String login() {
        User user = userService.find(username, password);
        FacesContext context = FacesContext.getCurrentInstance();

        if (user == null) {
            context.addMessage(null, new FacesMessage("Unknown login, try again"));
            username = null;
            password = null;
            return null;
        } else {
            context.getExternalContext().getSessionMap().put("user", user);
            return "userhome?faces-redirect=true";
        }
    }

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

    // ...
}

在同一会话的所有页面以及其他bean的@ManagedProperty中，登录用户都可以作为#{user}来使用.

The logged-in user will be available as #{user} in all pages throughout the same session and also in @ManagedProperty of other beans.

但是，注销后，使会话无效更为有意义.这也将破坏所有会话作用域的bean.您可以使用 ExternalContext#invalidateSession() .

On logout, however, it makes more sense to invalidate the session. This will trash all session scoped beans as well. You can use ExternalContext#invalidateSession() for this.

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

另请参见:

相关推荐