首先,在处理我的问题之前,我会向您介绍我的测试用例。 我的基本Maven Web应用程序中有一些组件:
我将分享重要组件的代码。
漂亮-config.xml中
<url-mapping id="page">
<pattern value="/page" />
<view-id value="/page.xhtml" />
</url-mapping>
FirstFilter.java
@WebFilter
public class FirstFilter implements Filter {
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
System.out.println("FirstFilter, request: " +
((HttpServletRequest)request).getRequestURL().toString());
chain.doFilter(request, response);
System.out.println("FirstFilter, response");
}
// override init and destroy
}
ThirdFilter.java
@WebFilter
public class ThirdFilter implements Filter {
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
System.out.println("ThirdFilter, request: " +
((HttpServletRequest)request).getRequestURL().toString());
chain.doFilter(request, response);
System.out.println("ThirdFilter, response");
}
// override init and destroy
}
的web.xml
<filter>
<filter-name>FirstFilter</filter-name>
<filter-class>nl.mhoogeveen.nl.rootapplication.FirstFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>FirstFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>Pretty Filter</filter-name>
<filter-class>testingapplications.filterchaining.PrettyFilter</filter-class>
<async-supported>true</async-supported>
</filter>
<filter-mapping>
<filter-name>Pretty Filter</filter-name>
<url-pattern>/*</url-pattern>
<dispatcher>FORWARD</dispatcher>
<dispatcher>REQUEST</dispatcher>
<dispatcher>ERROR</dispatcher>
<dispatcher>ASYNC</dispatcher>
</filter-mapping>
<filter>
<filter-name>ThirdFilter</filter-name>
<filter-class>testingapplications.filterchaining.ThirdFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>ThirdFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
场合
调用localhost:8080 / page.xhtml(因此不会激活Pretty Faces重定向)
INFO: FirstFilter, request: http://localhost:8080/page.xhtml
INFO: ThirdFilter, request: http://localhost:8080/page.xhtml
INFO: ThirdFilter, response
INFO: FirstFilter, response
调用localhost:8080 / page(从而激活Pretty Faces重定向)
INFO: FirstFilter, request: http://localhost:8080/page
INFO: FirstFilter, response
问题
导致我的链条不完整的原因是什么?它不会被切断,因为我仍然得到我对FirstFilter的回复。它似乎永远不会达到ThirdFilter。
我的web.xml
有什么问题,我错过了dispatcher
吗?
提前致谢。
答案 0 :(得分:7)
您的调度程序设置不正确。让我解释一下会发生什么:
/page
的请求进来,并由FirstFilter
首先处理。之后,PrettyFaces拦截请求并将其转发给/page.xhtml
。此转发的请求作为新请求处理,因此再次考虑过滤器链。但是,您的过滤器没有任何调度程序设置,这与设置<dispatcher>REQUEST</dispatcher>
相同。在此配置中,过滤器仅应用于常规请求,但不应用于转发请求。
如果您还想对转发的请求应用过滤器,则必须将<dispatcher>FORWARD</dispatcher>
添加到过滤器配置中。
这也是您通常必须调整第三方过滤器(如MyFaces Tomahawk / PrimeFaces等)的调度员设置的原因。请参阅常见问题解答中的问题2: