Servlet 过滤器 url 映射 [英] Servlet filter url mapping

问题描述

如何将过滤器映射到 URL 的根?我正在使用 Tomcat 7.0.2 并将应用程序部署为 ROOT.war.欢迎页面是 sign_in.xhtml.我想在客户端发送对站点根目录的请求(即仅域名)或客户端请求 sign_in.xhtml 时运行过滤器.这是我目前所拥有的:

How can a filter be mapped to the root of a URL? I'm using Tomcat 7.0.2 and deploying an application as ROOT.war. The welcome page is sign_in.xhtml. I would like to run a filter whenever the client sends a request for the root of the site (i.e. the domain name only), or when the the client requests sign_in.xhtml. Here is what I have so far:

  <filter>
        <filter-name>My filter</filter-name>
        <filter-class>com.myApp.myFilter</filter-class>        
    </filter>
    <filter-mapping>
        <filter-name>My filter</filter-name>
        <url-pattern>/sign_in.xhtml</url-pattern>
    </filter-mapping>

直接请求sign_in.xhtml，成功调用过滤器，但不知道如何获取root调用过滤器的请求.根据 Servlet 规范(3.0 版)

Requests for sign_in.xhtml directly, successfully invoke the filter, but I'm not sure how to get requests for the root to invoke the filter. According to the Servlet spec (version 3.0)

<url-pattern>/</url-pattern>

映射到默认 servlet，空字符串映射到根.这是规范中的相关部分:

maps to the default servlet, and an empty string maps to the root. Here's the relevant section from the spec:

"空字符串 ("") 是一种特殊的 URL 模式，它精确地映射到应用程序的上下文根，即 http://host:port//形式的请求.在这种情况下，路径信息是/"，servlet 路径和上下文路径是空字符串(")."

"The empty string ("") is a special URL pattern that exactly maps to the application's context root, i.e., requests of the form http://host:port//. In this case the path info is ’/’ and the servlet path and context path is empty string ("")."

但是，以下两种 url 模式都会导致 Tomcat 抛出异常.

However, both of the following url patterns cause Tomcat to throw an exception.

<url-pattern></url-pattern>
<url-pattern>""</url-pattern>

如果有人能对此有所了解，我将不胜感激.谢谢.

I would really appreciate it if someone could shed some light on this. Thank You.

安德鲁

推荐答案

/ 应该适用于根目录上的请求.你试了吗?

The <url-pattern>/</url-pattern> should work for requests on the root. Did you try it?

如果您的意图更多地是过滤所有请求，那么您应该使用<url-pattern>/*</url-pattern>.

If your intent is more to filter all requests, then you should use <url-pattern>/*</url-pattern>.

更新:为了排除一个和另一个，我在 Tomcat 7 上测试了 / 的 url-pattern(同时使用 web.xml 和 @WebFilter(urlPatterns={"/"})) 并且它确实没有按预期工作.然而，/ 的 url-pattern 在 Tomcat 6 (Servlet 2.5) 和 Glassfish v3 (Servlet 3.0) 上按预期工作.我怀疑 Tomcat 7 中存在错误，因此我报告了 issue 49914关于这个.

Update: To exclude one and other, I tested the url-pattern of / at Tomcat 7 (using both web.xml and @WebFilter(urlPatterns={"/"})) and it indeed didn't work as expected. The url-pattern of / however works as expected on Tomcat 6 (Servlet 2.5) and also on Glassfish v3 (Servlet 3.0). I suspect a bug in Tomcat 7, so I've reported issue 49914 about this.

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