1、web.xml配置

1 
     
       2         
      
       过滤是否登陆
       3         
      
       encodingFilter
       4         
      
       com.stxx.manager.filter.EncodingFilter
       5         
      
        6             
       
        配置白名单
        7             
       
        noCheck
        8             
       
         9                 /login.jsp,10                 /register.jsp11             
       12         
      13         
      
       14             
       
        过滤不成功转向地址
       15             
       
        redirectPath
       16             
       
        /login.jsp
       17         
      18     
     19     
     
      20         
      
       encodingFilter
      21         
      
       *.jsp
      22     
     

 

2、创建过滤器

1 import java.io.IOException; 2 import java.util.ArrayList; 3 import java.util.List; 4 import javax.servlet.Filter; 5 import javax.servlet.FilterChain; 6 import javax.servlet.FilterConfig; 7 import javax.servlet.ServletException; 8 import javax.servlet.ServletRequest; 9 import javax.servlet.ServletResponse;10 import javax.servlet.http.HttpServletRequest;11 import javax.servlet.http.HttpServletResponse;12 import org.apache.commons.lang.StringUtils;13 import org.apache.log4j.Logger;14 15 /**16  * 登陆过滤 配置白名单、黑名单17  * @author zxf18  *19  */20 public class EncodingFilter implements Filter {21     22     Logger log = Logger.getLogger(EncodingFilter.class);23     24     private static final String NO_CHECK = "noCheck";25     private static final String REDIRECT_PATH = "redirectPath";26     private List
     
       noCheckList = new ArrayList
      
       ();27     private String redirectPath = "/login.jsp";28 29     public void init(FilterConfig init) throws ServletException {30         log.info("初始化filter....");31         String noChecks = init.getInitParameter(NO_CHECK);32         if(StringUtils.isNotBlank(noChecks)){33             if(StringUtils.indexOf(noChecks,",")!=-1){34                 for(String no : noChecks.split(",")){35                     noCheckList.add(StringUtils.trimToEmpty(no));36                 }37             }else{38                 noCheckList.add(noChecks);39             }40         }41         String path = init.getInitParameter(REDIRECT_PATH);42         if(StringUtils.isNotBlank(path)){43             redirectPath = path;44         }45     }46     47     private boolean check(String path) {48         if (noCheckList == null || noCheckList.size() <= 0)49             return false;50         for (String s : noCheckList) {51             if (path.indexOf(s) > -1) {52                 return true;53             }54         }55         return false;56     }57 58     public void doFilter(ServletRequest arg0, ServletResponse arg1,59             FilterChain arg2) throws IOException, ServletException {60         HttpServletRequest request = (HttpServletRequest) arg0;61         HttpServletResponse response = (HttpServletResponse) arg1;62         log.info("被filter过滤.......");63         String contextpath = request.getContextPath();64         if("/".equals(contextpath)){contextpath="";}65         if(check(request.getRequestURI())){66             log.info("白名单");67             arg2.doFilter(request, response);68         }else{69             log.info("黑名单");70             response.sendRedirect(response.encodeURL(contextpath+redirectPath));71         }72     }73 74     public void destroy() {75         log.info("销毁filter....");76     }77 78 }