是否可以添加到请求的可用参数（HttpServletRequest） [英] Is it possible to add to the available parameters of a request (HttpServletRequest)

问题描述

我想拦截过滤器/ servlet中的请求并向其添加一些参数。但是，请求不会公开'setParameter'方法，并且操作时参数map会抛出一个错误，说明它已被锁定。我可以尝试一种替代方案吗？

I want to intercept a request in a filter/servlet and add a few parameters to it. However, the request does not expose a 'setParameter' method and the parameter map when manipulated throws an error saying it is locked. Is there an alternative I can try?

推荐答案

子类 HttpServletRequestWrapper 并覆盖 getParameter 方法。该类的描述如下：

Subclass HttpServletRequestWrapper and override the getParameter methods. The description of this class reads:

提供HttpServletRequest接口的便捷实现，该接口可由希望调整请求的开发人员进行子类化。 Servlet。

Provides a convenient implementation of the HttpServletRequest interface that can be subclassed by developers wishing to adapt the request to a Servlet.

在过滤器中，将请求包装在子类的实例中。

In the filter, wrap the request in an instance of your subclass.

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