public class LoginedFilter implements Filter {
   
   /**
    * 排除的地址
    */
   private Map<String, Boolean> ignore;
   /**
    * 排除的后缀
    */
   private Map<String, Boolean> ignoreExt;
   
   /**
    * <b>功能描述：</b>实现接口,登录验证<br>
    * <b>修订记录：</b><br>
 
    */
   @Override
   public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException,
         ServletException {
      HttpServletRequest request = (HttpServletRequest)arg0;
      HttpServletResponse response = (HttpServletResponse) arg1;

      String a =  request.getRequestURI();

      String ss =  request.getRequestURI().replaceFirst(request.getContextPath(), "");

      String address = request.getRequestURI().replaceFirst(request.getContextPath(), "").substring(1);

      String ext = "";
      if(address.lastIndexOf(".") > 0) {
         ext = address.substring(address.lastIndexOf(".") + 1);
      }
      if(address.indexOf("/") != -1) {
         address = address.substring(address.indexOf("/") + 1, address.length());
      }


      if(null == this.ignore.get(address) && null == this.ignoreExt.get(ext)) {
         HttpSession session = request.getSession();
         // 如果session为空，则跳转到登录页面。
//       if(null == session.getAttribute("user") || session.isNew()) {
               response.sendRedirect(request.getContextPath()+"/index");
               return ;
         //}
      }
      arg2.doFilter(arg0, arg1);

   }

   @Override
   public void init(FilterConfig config) throws ServletException {
      // 初始化排除列表
      if(null == this.ignore) {
         this.ignore = new HashMap<String, Boolean>();
      }
      if(null == this.ignoreExt) {
         this.ignoreExt = new HashMap<String, Boolean>();
      }
      // 读取web.xml中的配置列表，装入Map对象，排除内容为Key，Value为true。
      String ignoreConfig = config.getInitParameter("ignore");
      String[] ignoreConfigArray = ignoreConfig.split(",");
      for(String string : ignoreConfigArray) {
         this.ignore.put(string.trim(), true);
      }
      String ignoreExtConfig = config.getInitParameter("ignoreExt");
      String[] ignoreExtConfigArray = ignoreExtConfig.split(",");
      for(String string : ignoreExtConfigArray) {
         this.ignoreExt.put(string.trim(), true);
      }
   }

   @Override
   public void destroy() {
      // 销毁时清除排除列表
      this.ignore.clear();
      this.ignore = null;
      this.ignoreExt.clear();
      this.ignoreExt = null;
   }

//下面是web.xml 配置

<filter>
  <filter-name>urlfilter</filter-name>
  <filter-class>com.payease.chains.order.common.Filter.LoginedFilter</filter-class>
  <init-param>
    <description>排除过滤的前缀</description>
    <param-name>ignore</param-name>
    <param-value>index,chains,main,fund,order,fundDetail,orderList,logout,OmsUpload,merchant,upload,main1,main2</param-value>
  </init-param>
  <init-param>
    <description>排除过滤的后缀</description>
    <param-name>ignoreExt</param-name>
    <param-value>js,css,jpg,gif,png,bmp,jpeg,ico</param-value>
  </init-param>
</filter>
<filter-mapping>
  <filter-name>urlfilter</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
  <filter-name>urlfilter</filter-name>
  <url-pattern>/**</url-pattern>
</filter-mapping>

spring 过滤器- 过滤登陆请求路径（过滤静态资源跳转到登陆页面)