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)

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>