java过滤器不起作用，请帮忙指导谢谢

Question

源代码（过滤时候登陆登陆）package com.nl.utils;
public class LoginFilter implements Filter  {
    public void destroy() {
    }    public void doFilter(ServletRequest arg0, ServletResponse arg1,
            FilterChain arg2) throws IOException, ServletException {
        // TODO Auto-generated method stub
        HttpServletRequest httpReq = (HttpServletRequest)arg0;
        SessionData sessionData = (SessionData)(httpReq.getSession().getAttribute(MgrConst.SESSION_KEY));
        if(sessionData == null){
            RequestDispatcher rd = httpReq.getSession().getServletContext().getRequestDispatcher("/home.do");
            rd.forward(arg0, arg1);
        }
        arg2.doFilter(arg0, arg1);
    }    public void init(FilterConfig arg0) throws ServletException {
        System.out.println("进来了");
    }
}xml配置
<filter>
    <filter-name>loginFilter</filter-name>
    <filter-class>com.nl.utils.LoginFilter</filter-class>
</filter>
<filter-mapping>
  <filter-name>loginFilter</filter-name>
  <servlet-name>*.do</servlet-name>
</filter-mapping>该配置放在了xml文件顶端位置调试发现每次都不走过滤器代码请大家指导下，谢谢

Answer 1

servlet-name>*.do</servlet-name>
换成
<url-pattern>/*</url-pattern> 

Answer 2

lz还是去看看filter的配置估计你对配置不了解

Answer 3

把
<servlet-name>*.do</servlet-name>
换成
<url-pattern>*.do</url-pattern>过滤.do结尾的url

Answer 4

<filter-mapping>
   <filter-name>loginFilter</filter-name>
   <url-pattern>*.do</url-pattern>
</filter-mapping>

Answer 5

无语 真是眼大无珠  连url-pattern都没看见，看来拷贝也要仔细啊谢谢大家帮忙