Java Web应用程序会话变量

Question

如何在会话变量登录后将当前用户的信息存储在会话变量中？ 登录后，需要在整个Web应用程序中访问此数据。

这是我到目前为止：

User.java

@Named
@Table
@Entity
@SessionScoped
public class User implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name = "id")
    private long id;

    @Column(name = "firstname")
    private String firstname;

    @Column(name = "lastname")
    private String lastname;

    @Column(name="username")
    private String username;

    @Column(name = "password")
    private String password;

    public User() {}
...

UserData.java

@Named
@RequestScoped
public class UserData implements Serializable {

    private static final long serialVersionUID = 1L;
    SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
    Session session = null;
    Transaction tx = null;
    List<User> users;
    String username;
    String password;

    public String getUsername() {
        return username;
    }
    public String getPassword() {
        return password;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public void setPassword(String password) {
        this.password = password;
    }

    public UserData() {
        try {
            this.session = sessionFactory.openSession();
        }
        catch(Exception e) {
            e.printStackTrace();
        }
    }

public void login() {
    System.out.println("Authorize: Username: " + this.username + " Password: " + this.password);

    Query query = session.createQuery("from User U where U.username = :username and U.password = :password");
    query.setParameter("username", this.username);
    query.setParameter("password", this.password);
    System.out.println(query.list());
}

返回了正确的用户对象，但我不知道如何在用户的会话数据中保存用户对象。

我正在使用的技术（如果有帮助）：

• 过冬
• MySQL的
• JPA
• JSF
• Wildfly

Answer 1

由于您的User类由@Named批注管理，因此只需在要使用它的类中注入其实例即可访问当前用户：

@Inject
private User user;

另一种解决方案是使用这样的代码：

FacesContext context = FacesContext.getCurrentInstance();
User user = context.getApplication().evaluateExpressionGet(context, "#{user}", User.class);