java - Spring MVC session 属性访问

Question

在 spring 3.0 下有什么方法可以访问 HttpSession 而不将其包含在方法签名中？我真正想做的是能够从可以为空的 HttpSession 中传递值。

类似这样的:

@RequestMapping("/myHomePage")
public ModelAndView show(UserSecurityContext ctx) {}

而不是这个:

@RequestMapping("/myHomePage")
public ModelAndView show(HttpSession session) {
      UserSecurityContext ctx = (UserSecurityContext) session.getAttribute("userSecurityCtx");
}

Answer 1

@uthark 提到的 @SessionAttribute 注释不适合这个任务 - 我也认为是，但是 bit of reading否则显示:

Session attributes as indicated using this annotation correspond to a specific handler's model attributes, getting transparently stored in a conversational session. Those attributes will be removed once the handler indicates completion of its conversational session. Therefore, use this facility for such conversational attributes which are supposed to be stored in the session temporarily during the course of a specific handler's conversation.

For permanent session attributes, e.g. a user authentication object, use the traditional session.setAttribute method instead. Alternatively, consider using the attribute management capabilities of the generic WebRequest interface.

换句话说，@SessionAttribute 用于在 session 中存储 session MVC 模型对象(而不是将它们存储为请求属性)。它不适用于任意 session 属性。正如您所发现的，它仅在 session 属性始终存在时才有效。

我不知道任何其他选择，我认为你被 HttpSession.getAttribute()

所困扰