servlet过滤器配置白名单、黑名单

 1 <filter>
 2         <description>过滤是否登陆</description>
 3         <filter-name>encodingFilter</filter-name>
 4         <filter-class>com.stxx.manager.filter.EncodingFilter</filter-class>
 5         <init-param>
 6             <description>配置白名单</description>
 7             <param-name>noCheck</param-name>
 8             <param-value>
 9                 /login.jsp,
10                 /register.jsp
11             </param-value>
12         </init-param>
13         <init-param>
14             <description>过滤不成功转向地址</description>
15             <param-name>redirectPath</param-name>
16             <param-value>/login.jsp</param-value>
17         </init-param>
18     </filter>
19     <filter-mapping>
20         <filter-name>encodingFilter</filter-name>
21         <url-pattern>*.jsp</url-pattern>
22     </filter-mapping>

 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 zxf
18  *
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<String> noCheckList = new ArrayList<String>();
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 }