web应用怎么跳过某些Filter

在做的项目需要用到cas，而使用cas的话，需要在client的webapp的web.xml中配置好多个filter，但是需要兼容到老的逻辑，如果满足某些条件，就不走cas的filter，满足另外一些条件，只走cas的其中几个filter，那该怎么进行filter的相关配置呢？

从网上搜到了一片blog：http://blog.csdn.net/tandaly/article/details/8687671，里面讲述了两种方式。

第一种是给filter设置标识。我目前考虑，在自己项目中采取这种为filter加标识的方式：

publicclass FirstFilter implementsFilter {  
    //...  
   
    publicvoid doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)throwsIOException, ServletException {  
        servletRequest.setAttribute("executeSecondFilter",true);  
        //...  
        if(someReason)  
            servletRequest.setAttribute("executeSecondFilter",false); 
　　　　　　　servletRequest.setAttribute("executeThirdFilter",false);
　　　　　　　servletRequest.setAttribute("executeForthFilter",true); 
        filterChain.doFilter(servletRequest, servletResponse);  
    }  
}  
   
publicclass SecondFilter implementsFilter {  
    //..  
   
    publicvoid doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)throwsIOException, ServletException {  
        if(servletRequest.getAttribute("executeSecondFilter") == null|| !((Boolean) servletRequest.getAttribute("executeSecondFilter"))) {  
            filterChain.doFilter(servletRequest, servletResponse);  
        }  
        //...  
    }  
}  

publicclass ThirdFilter implementsFilter {  
    //..  
   
    publicvoid doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)throwsIOException, ServletException {  
        if(servletRequest.getAttribute("executeThirdFilter") == null|| !((Boolean) servletRequest.getAttribute("executeThirdFilter"))) {  
            filterChain.doFilter(servletRequest, servletResponse);  
        }  
        //...  
    }  
}

filterChain.doFilter（）的作用是跳转到filter链的下一个filter。