How do I apply a servlet filter when serving an HTML page directly?

问题

First off, I'm using Google AppEngine and Guice, but I suspect my problem is not related to these.

When the user connect to my (GWT) webapp, the URL is a direct html page. For example, in development mode, it is: http://127.0.0.1:8888/Puzzlebazar.html?gwt.codesvr=127.0.0.1:9997. Now, I setup my web.xml in the following way:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
 version="2.5">
 <display-name>PuzzleBazar</display-name>

 <!-- Default page to serve -->
 <welcome-file-list>
  <welcome-file>Puzzlebazar.html</welcome-file>
 </welcome-file-list>


 <filter>
  <filter-name>guiceFilter</filter-name>
  <filter-class>com.google.inject.servlet.GuiceFilter</filter-class>
 </filter>

 <filter-mapping>
  <filter-name>guiceFilter</filter-name>
  <url-pattern>/*</url-pattern>
 </filter-mapping>

 <!--
  This Guice listener hijacks all further filters and servlets. Extra
  filters and servlets have to be configured in your
  ServletModule#configureServlets() by calling
  serve(String).with(Class<? extends HttpServlet>) and
  filter(String).through(Class<? extends Filter)
 -->
 <listener>
  <listener-class>com.puzzlebazar.server.guice.MyGuiceServletContextListener
  </listener-class>
 </listener>

</web-app>

And my appengine-web.xml is:

<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
    <application>puzzlebazaar</application>
    <version>1</version>
    <sessions-enabled>true</sessions-enabled>

    <!-- Configure java.util.logging -->
    <system-properties>
        <property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>     
    </system-properties>

</appengine-web-app>

Since I'm using Guice, I have to configure extra filters in my ServletModule, where I do this:

filter("*.html").through( SecurityCookieFilter.class );

But my SecurityCookieFilter.doFilter is never called. I tried things like "*.html*" or <url-pattern>*</url-pattern> but to no avail. Any idea how I should do this?

回答1:

You've probably configured html files to be served up as static content in your appengine-web.xml. Static file serving doesn't involve your app at all, so you can't filter the output.

回答2:

If your need happens to be (like mine) to make GAE add certain http response headers for static HTML files, you can do this by declaring them as static resource in appengine-web.xml like this:

<static-files>
  <include path="/my_static-files" >
    <http-header name="Access-Control-Allow-Origin" value="http://example.org" />
  </include>
</static-files>

I found this in the GAE documentation

来源：https://stackoverflow.com/questions/2770323/how-do-i-apply-a-servlet-filter-when-serving-an-html-page-directly

标签

google-app-engine

Tomcat

gwt

servlets

Guice