什么时候用HttpServletRequest / Response之外的任何东西调用javax.servlet.Filter.doFilter（ServletRequest req，ServletResponse res）？ [英] When would javax.servlet.Filter.doFilter(ServletRequest req, ServletResponse res) be called with anything other than HttpServletRequest/Response?

问题描述

我多年来一直在编写servlet和过滤器，它总是让我感到烦恼 - 检查和转换 ServletRequest 和 ServletResponse 参数 HttpServletRequest 和 HttpServletResponse ，尤其是过滤器，因为没有标准 HttpFilter 基类为你做这件事 - 与servlet不同。

I've been writing servlets and filters for years and it is something that has always irked me a little - the checking and casting of ServletRequest and ServletResponse parameters to HttpServletRequest and HttpServletResponse, particularly with filters as there is no standard HttpFilter base class to do this for you - unlike servlets.

问题是 - 你何时会看到其他任何东西那个 HttpServletRequest / HttpServletResponse 被传递给你的servlet /过滤器，你该怎么办？

The question is - when would you ever see anything other that HttpServletRequest/HttpServletResponse being passed to your servlet/filter and what should you do if you do?

推荐答案

在一些尚未实现的世界中，除了HttpServlet之外还有其他servlet类型。

In some yet-to-be-realized world where there are other servlet types besides HttpServlets.

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