Spring MVC:控制器之间共享@SessionAttributes? [英] Spring MVC: @SessionAttributes shared among controllers?

问题描述

我有一个用于搜索和结果列表的抽象控制器支持类:

I have an abstract controller support class for searches and result lists:

@Controller
@SessionAttributes("query")
public abstract class SearchController<Q extends SearchQuery> {
    @RequestMapping
    public String performSearch(@ModelAttribute("query") Q query) {
        ....
    }

    @ModelAttribute("query")
    public abstract Q createDefaultSearchQuery();
}

几个实际的搜索控制器扩展了该基类.

Several actual search controllers extend this base class.

在访问了一个控制器(例如，使用BookSearchQuery implements SearchQuery的/searchBooks.html)之后，查询已正确存储在会话中，可用于后续请求.

After having accessed one of the controllers (say /searchBooks.html using BookSearchQuery implements SearchQuery) the query is correctly stored in the session, available for subsequent requests.

但是，当我访问另一个控制器(例如使用AuthorSearchQuery implements SearchQuery的/searchAuthors.html)时，来自上一个请求(BookSearchQuery)的查询仍用于新控制器，从而导致稍后出现ClassCastException.

However, when I access another controller (say /searchAuthors.html using AuthorSearchQuery implements SearchQuery) the query from the last request (BookSearchQuery) is still being used for the new controller causing a ClassCastException later on.

我尝试将@SessionAttribute注释从支持类移至实现类，但无济于事.

I have tried moving the @SessionAttribute annotation from the support class to the implementation classes, to no avail.

我在做错什么吗?或者这是设计使然?我该怎么办?

Is there something I'm doing wrong or is this by design? What can I do?

非常感谢！

推荐答案

使用@SessionAttributes，这些对象将以相同的名称存储在HttpSession中，并且可以从不同的控制器进行访问(共享).因此，Spring的行为正确.

Using @SessionAttributes this objects will be stored in your HttpSession with the same name and they will be accessible (shared) from different controllers. So, Spring is acting correctly.

我认为在您的方案中，最好的方法是在每个子类("BookQuery"，"AutorQuery"，...)中重命名此属性.一点也不优雅:(

I think the best approach in your scenario is rename this attribute in every subclass ("BookQuery", "AutorQuery", ...). Not very elegant at all :(

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