java – JSF PrettyFaces导致过滤链 – ‘破解’

2022-07-24 20:38:27

首先,在处理我的问题之前,我将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：

> page.xhtml：用于生成我的请求/回复(以启动过滤)
> Pretty Faces：用于根据客户的需要重新定义URL
> FirstFilter：在Pretty Faces之前执行(在此体育场内进行测试)
> ThirdFilter：在Pretty Faces之后执行(在此体育场内进行测试)
> web.xml：定义完整Filter Chain的行为

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
}

web.xml中

<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>

情况

调用localhost：8080 / page.xhtml(因此不激活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

题

是什么原因导致我的链条不完整？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有什么问题吗,我错过了一个调度员吗？

提前致谢.

解决方法:

您的调度程序设置不正确.让我解释一下会发生什么：

对/ page的请求进入并由FirstFilter首先处理.之后,PrettyFaces拦截请求并将其转发到/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.

如果您还要对转发的请求应用过滤器,则必须添加< dispatcher> FORWARD< / dispatcher>到过滤器配置.

这也是您通常必须调整第三方过滤器(如MyFaces Tomahawk / PrimeFaces等)的调度程序设置的原因.请参阅常见问题解答中的问题2：

http://ocpsoft.org/prettyfaces/#section-16

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