如何在JSF的会话范围内获取和设置对象? [英] How do I get and set an object in session scope in JSF?

问题描述

我只需要在JSF应用程序的会话范围内保留一个对象.我在哪里定义会话变量，以及如何从视图文件或支持bean中获取和设置会话变量?

I need to persist just one object in session scope of my JSF application. Where do I define a session variable, and how do I get and set it from either a view file or backing bean?

推荐答案

两种常用方法:

• 将其存储在

  再后来:

  SomeObject yourVariable = (SomeObject) sessionMap.get("somekey");
  

• 或者，使其成为您在@RequestScoped bean中注入的@SessionScoped bean的属性.

• Or, make it a property of a @SessionScoped bean which you inject in your @RequestScoped bean.

  sessionBean.setSomeVariable(yourVariable);
  

  再后来:

  SomeObject yourVariable = sessionBean.getSomeVariable();
  

  您可以通过@Inject将@Named @SessionScoped转换为@Named @RequestScoped.

  @Inject
  private SessionBean sessionBean;
  

  或者，如果您尚未使用CDI，则可以通过@ManagedProperty将@ManagedBean @SessionScoped转换为@ManagedBean @RequestScoped.

  Or, if you're not using CDI yet, you can get a @ManagedBean @SessionScoped into a @ManagedBean @RequestScoped via @ManagedProperty.

  @ManagedProperty("#{sessionBean}")
  private SessionBean sessionBean; // +getter+setter
  

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