Roller4.0.1的Filter

Roller使用了一些自己的Filter

   <!-- 从名称上看，是安全性配置，这个是acegi的配置文件定义 -->  
   <context-param>  
       <param-name>contextConfigLocation</param-name>  
       <param-value>/WEB-INF/security.xml</param-value>  
   </context-param>  
     
   <!--  这个就是struts2的配置 ，struts2的Filter要放在最前面。以前项目中，前面放了其他的Filter，造成struts的ValueStack有问题， 页面用struts2标签获取不到元素   -->
   <filter>  
       <filter-name>struts2</filter-name>  
       <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>  
   </filter>  
     
  <!-- 要使用struts2上传，要配置这个filter，否则会有一些不知名的错误发生。同样struts的filter放在最前面 -->  
   <!-- This is really strange, but for some reason it's needed to prevent  some problems with the file uploads not working intermittently -->  
   <filter>  
       <filter-name>struts2-cleanup</filter-name>  
       <filter-class>org.apache.struts2.dispatcher.ActionContextCleanUp</filter-class>  
   </filter>  
     
<!-- acegi安全组件的filter，通过这个进行权限管理 -->  
   <filter>  
       <filter-name>securityFilter</filter-name>  
       <filter-class>org.acegisecurity.util.FilterToBeanProxy</filter-class>  
       <init-param>  
           <param-name>targetClass</param-name>  
           <param-value>org.acegisecurity.util.FilterChainProxy</param-value>  
       </init-param>  
   </filter>  
     
   <!-- 调试用的Filter，简单的记录request、response等信息，只是作为记录使用， 在正式的使用中可以去掉 -->  
   <filter>  
       <filter-name>DebugFilter</filter-name>  
       <filter-class>org.apache.roller.weblogger.ui.core.filters.DebugFilter</filter-class>  
   </filter>  
     
   <!-- 在处理结束后，检验一下是否Persistence Session都释放掉了。这个是一个增强的作用，保证处理结束后，Weblogger都被释放掉了 -->  
   <filter>  
       <filter-name>PersistenceSessionFilter</filter-name>  
       <filter-class>org.apache.roller.weblogger.ui.core.filters.PersistenceSessionFilter</filter-class>  
   </filter>  
     
   <!-- 检查系统是否准备好了： 有weblogger、数据库安装情况 。这个是对系统运行的基础进行一个检查    -->  
   <filter>  
       <filter-name>BootstrapFilter</filter-name>  
       <filter-class>org.apache.roller.weblogger.ui.core.filters.BootstrapFilter</filter-class>  
   </filter>  
     
   <!-- 压缩      
    Most app servers support compression, if yours doesn't then use this one,  
   but don't forget to uncomment the mapping below too.  
   <filter>  
       <filter-name>CompressionFilter</filter-name>  
       <filter-class>org.apache.roller.weblogger.ui.core.filters.CompressionFilter</filter-class>  
   </filter>  
   -->  
  
    <!-- 请求的Request可能会被一系列的RequestMapper进行检查，可能会隐含的被转到不同的处理地点   ？  -->  
   <filter>  
       <filter-name>RequestMappingFilter</filter-name>  
       <filter-class>org.apache.roller.weblogger.ui.rendering.filters.RequestMappingFilter</filter-class>  
   </filter>  
     
    <!-- 一个特殊的初始化Filter，在第一次请求发送的时候，确保有机会获取运行时的一些信息    ?   -->  
   <filter>  
       <filter-name>InitFilter</filter-name>  
       <filter-class>org.apache.roller.weblogger.ui.core.filters.InitFilter</filter-class>  
   </filter>  
     
   <!-- IP限制的Filter : 这个没有什么好说的，禁止某些IP访问。 通过在配置文件中的 ipbanlist.file定义的文件来进行限制，这个文件每一行一个IP地址，通过和request.getRemoteAddr()来进行比较  
   -->  
   <filter>  
       <filter-name>IPBanFilter</filter-name>  
       <filter-class>org.apache.roller.weblogger.ui.core.filters.IPBanFilter</filter-class>  
   </filter>  
     
   <!-- 提供安全登陆，确保登陆urls使用https ？   -->  
   <filter>  
       <filter-name>SchemeEnforcementFilter</filter-name>  
       <filter-class>org.apache.roller.weblogger.ui.core.filters.SchemeEnforcementFilter</filter-class>  
   </filter>  
     
   <!-- 所有请求的入口，保证请求用UTF-8编码。这个通常是处理链上的第一个和最后一个。 Roller要求的编码方式是UTF-8，在进行处理之前进行保证  
    -->  
   <filter>  
       <filter-name>CharEncodingFilter</filter-name>  
       <filter-class>org.apache.roller.weblogger.ui.core.filters.CharEncodingFilter</filter-class>  
   </filter>  

Roller自己提供的几个Filter：

１.DebugFilter：　

　　org.apache.roller.weblogger.ui.core.filters.DebugFilter

２.PersistenceSessionFilter：

　　org.apache.roller.weblogger.ui.core.filters.PersistenceSessionFilter

３. BootstrapFilter ：

　　org.apache.roller.weblogger.ui.core.filters.BootstrapFilter

　　其实这个也只有在安装的时候管用，正常运行起来就不需要了

４.RequestMappingFilter：

　　org.apache.roller.weblogger.ui.rendering.filters.RequestMappingFilter

５.InitFilter：

　　org.apache.roller.weblogger.ui.core.filters.InitFilter

６.IPBanFilter：

　　org.apache.roller.weblogger.ui.core.filters.IPBanFilter

　　这个简单，只需要知道ＩＰｂａｎ的配置，以及配置文件如何写即可

７.SchemeEnforcementFilter

　　org.apache.roller.weblogger.ui.core.filters.SchemeEnforcementFilter

８.CharEncodingFilter：
    org.apache.roller.weblogger.ui.core.filters.CharEncodingFilter

Filter-Mapping如下：

    <!-- ******************************************
         Filter mappings - order IS important here.  
         ****************************************** -->
    
    <!--
     NOTE: Wherever "dispatcher" elements are specified in the filter mappings, they are
     required for Servlet API 2.4 containers, such as Tomcat 5+ and Resin 3+, but should be
     commented out for Servlet API 2.3 containers, like Tomcat 4.x and Resin 2.x.
    -->
    
    <!-- This filter ensures that the request encoding is set to UTF-8 before any 
     other processing forces request parsing using a default encoding.
    Note: Any filters preceding this one MUST not cause request parsing. -->
    <filter-mapping>
        <filter-name>CharEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
        <dispatcher>REQUEST</dispatcher>
        <dispatcher>FORWARD</dispatcher>
    </filter-mapping>
    
    <!-- Ip Banning is mapped for comment and trackbacks only.
    Note: this filter does nothing if an ip ban list is not configured. -->
    <filter-mapping>
        <filter-name>IPBanFilter</filter-name>
        <url-pattern>/roller-ui/rendering/comment/*</url-pattern>
        <dispatcher>FORWARD</dispatcher>
    </filter-mapping>
    <filter-mapping>
        <filter-name>IPBanFilter</filter-name>
        <url-pattern>/roller-ui/rendering/trackback/*</url-pattern>
        <dispatcher>FORWARD</dispatcher>
    </filter-mapping>
    
    <!-- Scheme enforcement.  Only here until we get Acegi scheme enforcement working -->
    <filter-mapping>
        <filter-name>SchemeEnforcementFilter</filter-name>
        <url-pattern>/*</url-pattern>
        <dispatcher>REQUEST</dispatcher>
    </filter-mapping>
    
    <!-- Acegi Security filters - controls secure access to different parts of Roller -->
    <filter-mapping>
        <filter-name>securityFilter</filter-name>
        <url-pattern>/*</url-pattern>
        <dispatcher>REQUEST</dispatcher>
        <dispatcher>FORWARD</dispatcher>
    </filter-mapping>
    
    <filter-mapping>
        <filter-name>BootstrapFilter</filter-name>
        <url-pattern>/*</url-pattern>
        <dispatcher>REQUEST</dispatcher>
    </filter-mapping>
    
    <!-- Map everything to the PersistenceSessionFilter.
    NOTE: Any filters preceding this one MUST NOT use persistence sessions.-->
    <filter-mapping>
        <filter-name>PersistenceSessionFilter</filter-name>
        <url-pattern>/*</url-pattern>
        <dispatcher>REQUEST</dispatcher>
    </filter-mapping>
    
    <!-- Init filter.  performs some initialization on first request -->
    <filter-mapping>
        <filter-name>InitFilter</filter-name>
        <url-pattern>/*</url-pattern>
        <dispatcher>REQUEST</dispatcher>
    </filter-mapping>
    
    <!-- Request mapping.  this is what allows the urls to work -->
    <filter-mapping>
        <filter-name>RequestMappingFilter</filter-name>
        <url-pattern>/*</url-pattern>
        <dispatcher>REQUEST</dispatcher>
    </filter-mapping>
    
    <!-- 
    Most app servers support compression, if yours doesn't then use this one,
    but don't forget to uncomment the filter definition above too.
    <filter-mapping>
        <filter-name>CompressionFilter</filter-name>
        <url-pattern>/roller-ui/rendering/page/*</url-pattern>
        <dispatcher>FORWARD</dispatcher>
    </filter-mapping>
    <filter-mapping>
        <filter-name>CompressionFilter</filter-name>
        <url-pattern>/roller-ui/rendering/feed/*</url-pattern>
        <dispatcher>FORWARD</dispatcher>
    </filter-mapping>
    -->
    
    <!-- Struts2 -->
    <filter-mapping>
        <filter-name>struts2-cleanup</filter-name>
        <url-pattern>/*</url-pattern>
        <dispatcher>REQUEST</dispatcher>
        <dispatcher>FORWARD</dispatcher>
    </filter-mapping>
    
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
        <dispatcher>REQUEST</dispatcher>
        <dispatcher>FORWARD</dispatcher>
    </filter-mapping>
    
    
    <!-- Context Listeners -->
	<!-- 控制session的启动和关闭 -->
    <listener>
        <listener-class>org.apache.roller.weblogger.ui.core.RollerSession</listener-class>
    </listener>
    
	<!-- 初始化Roller web application/context -->
    <listener>
        <listener-class>org.apache.roller.weblogger.ui.core.RollerContext</listener-class>
    </listener>
    
	<!-- Tile的一个监听器 -->
    <listener>
        <listener-class>org.apache.tiles.web.startup.TilesListener</listener-class>
    </listener>