<filter>

         <description>过滤是否登陆</description>

         <filter-name>encodingFilter</filter-name>

         <filter-class>com.stxx.manager.filter.EncodingFilter</filter-class>

         <init-param>

             <description>配置白名单</description>

             <param-name>noCheck</param-name>

             <param-value>

                 /login.jsp,

                 /register.jsp

             </param-value>

         </init-param>

         <init-param>

             <description>过滤不成功转向地址</description>

             <param-name>redirectPath</param-name>

             <param-value>/login.jsp</param-value>

         </init-param>

     </filter>

     <filter-mapping>

         <filter-name>encodingFilter</filter-name>

         <url-pattern>*.jsp</url-pattern>

     </filter-mapping>

 import java.io.IOException;

 import java.util.ArrayList;

 import java.util.List;

 import javax.servlet.Filter;

 import javax.servlet.FilterChain;

 import javax.servlet.FilterConfig;

 import javax.servlet.ServletException;

 import javax.servlet.ServletRequest;

 import javax.servlet.ServletResponse;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import org.apache.commons.lang.StringUtils;

 import org.apache.log4j.Logger;

 /**

  * 登陆过滤 配置白名单、黑名单

  * @author zxf

  *

  */

 public class EncodingFilter implements Filter {

     Logger log = Logger.getLogger(EncodingFilter.class);

     private static final String NO_CHECK = "noCheck";

     private static final String REDIRECT_PATH = "redirectPath";

     private List<String> noCheckList = new ArrayList<String>();

     private String redirectPath = "/login.jsp";

     public void init(FilterConfig init) throws ServletException {

         log.info("初始化filter....");

         String noChecks = init.getInitParameter(NO_CHECK);

         if(StringUtils.isNotBlank(noChecks)){

             if(StringUtils.indexOf(noChecks,",")!=-){

                 for(String no : noChecks.split(",")){

                     noCheckList.add(StringUtils.trimToEmpty(no));

                 }

             }else{

                 noCheckList.add(noChecks);

             }

         }

         String path = init.getInitParameter(REDIRECT_PATH);

         if(StringUtils.isNotBlank(path)){

             redirectPath = path;

         }

     }

     private boolean check(String path) {

         if (noCheckList == null || noCheckList.size() <= )

             return false;

         for (String s : noCheckList) {

             if (path.indexOf(s) > -) {

                 return true;

             }

         }

         return false;

     }

     public void doFilter(ServletRequest arg0, ServletResponse arg1,

             FilterChain arg2) throws IOException, ServletException {

         HttpServletRequest request = (HttpServletRequest) arg0;

         HttpServletResponse response = (HttpServletResponse) arg1;

         log.info("被filter过滤.......");

         String contextpath = request.getContextPath();

         if("/".equals(contextpath)){contextpath="";}

         if(check(request.getRequestURI())){

             log.info("白名单");

             arg2.doFilter(request, response);

         }else{

             log.info("黑名单");

             response.sendRedirect(response.encodeURL(contextpath+redirectPath));

         }

     }

     public void destroy() {

         log.info("销毁filter....");

     }

 }