web.xml过滤器链序列

Question

我需要帮助弄清楚为什么我的过滤器对*.jsf请求以这种方式链接：

滤波器1->滤波器3->滤波器2-

对于*.jsp请求（所需的链），采用这种方式：

过滤器1->过滤器2->过滤器3

<filter>
    <display-name>filter1</display-name>
    <filter-name>filter1</filter-name>
    <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter>
    <display-name>filter2</display-name>
    <filter-name>filter2</filter-name>
    <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter>
    <display-name>filter3</display-name>
    <filter-name>filter3</filter-name>
    <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>

<filter-mapping>
    <filter-name>filter1</filter-name>
    <url-pattern>*.jsf</url-pattern>
    <url-pattern>*.jsp</url-pattern>
    <dispatcher>REQUEST</dispatcher>
</filter-mapping>
<servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>*.jsf</url-pattern>
</servlet-mapping>  
<filter-mapping>
    <filter-name>filter2</filter-name>
    <servlet-name>Faces Servlet</servlet-name>
    <dispatcher>FORWARD</dispatcher>
    <dispatcher>INCLUDE</dispatcher>
    <dispatcher>REQUEST</dispatcher>
    <dispatcher>ERROR</dispatcher>
</filter-mapping>
<filter-mapping>
    <filter-name>filter2</filter-name>      
    <url-pattern>*.jsp</url-pattern>    
</filter-mapping>
<filter-mapping>
    <filter-name>filter3</filter-name>
    <url-pattern>*.jsp</url-pattern>
    <url-pattern>*.jsf</url-pattern>
    <dispatcher>REQUEST</dispatcher>
</filter-mapping>

Answer 1

最初的问题是由过滤器优先于FacesServlet引起的。尽管filter2是一个过滤器，但它也与FacesServlet相关联，因此在所有其他过滤器之后执行。为了抵消这一点，我将FacesServlet与我链中的最后一个过滤器filter3相关联。

通过以下映射，.jsp和.jsf现在都按所需顺序执行：filter1->filter2->filter3-

<filter-mapping>
    <filter-name>filter1</filter-name>
    <url-pattern>*.jsf</url-pattern>
    <url-pattern>*.jsp</url-pattern>
    <dispatcher>REQUEST</dispatcher>
</filter-mapping>
<filter-mapping>
    <filter-name>filter2</filter-name>      
    <url-pattern>*.jsp</url-pattern>    
    <url-pattern>*.jsf</url-pattern>    
</filter-mapping>
<filter-mapping>
    <filter-name>filter3</filter-name>
    <url-pattern>*.jsp</url-pattern> <!-- only .jsp since .jsf will be picked up by faces servlet/filter combo -->
    <dispatcher>REQUEST</dispatcher>
</filter-mapping>
<servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>*.jsf</url-pattern> 
</servlet-mapping>  
<filter-mapping> <!-- this gets picked up last because of filter vs. servlet precedence, not because of position in web.xml -->
    <filter-name>filter3</filter-name> 
    <servlet-name>Faces Servlet</servlet-name>
    <dispatcher>FORWARD</dispatcher>
    <dispatcher>INCLUDE</dispatcher>
    <dispatcher>REQUEST</dispatcher>
    <dispatcher>ERROR</dispatcher>
</filter-mapping>