Go语言视频零基础入门到精通

javalearner

简单的防盗链过滤器代码，保护cwb目录和dir2目录下的zip文件不被盗链。

一、web.xml文件 <?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">  <display-name>Welcome to Tomcat</display-name>
<description>
   Welcome to Tomcat
</description>
<filter>
   <filter-name>SecurityFilter</filter-name>
   <filter-class>example.SecurityFilter</filter-class>
</filter>  <filter-mapping>
   <filter-name>SecurityFilter</filter-name>
   <url-pattern>/dir2/*</url-pattern>
</filter-mapping>
<filter-mapping>
   <filter-name>SecurityFilter</filter-name>
   <url-pattern>/cwb/*</url-pattern>
</filter-mapping>  <Servlet>
   <servlet-name>log4j-init</servlet-name>
   <servlet-class>example.Log4jInit</servlet-class>
   <init-param>
     <param-name>log4j</param-name>
     <param-value>WEB-INF/log4j.properties</param-value>
   </init-param>
<load-on-startup>1</load-on-startup>
</servlet>  </web-app> 二、过滤器代码

1. 
   
2. package example;
   
3. import javax.servlet.Filter;
   
4. import javax.servlet.FilterConfig;
   
5. import javax.servlet.ServletRequest;
   
6. import javax.servlet.ServletResponse;
   
7. import javax.servlet.FilterChain;
   
8. import javax.servlet.ServletException;
   
9. import javax.servlet.http.*;
   
10. import java.io.IOException;
    
11. import java.util.Iterator;
    
12. import java.util.Set;
    
13. import java.util.HashSet;
    
14. import org.apache.log4j.*;
    
15. public class SecurityFilter implements Filter {
    
16.        
    
17.         private static final String JAVA3Z_URL = "http://www.java3z.com/cwbwebhome/index.html";
    
18.         private static final String K_URL="http://www.xxx.com/index.html";
    
19.        
    
20.        
    
21.       private Logger logger = Logger.getLogger("this.SecurityFilter");
    
22.        
    
23.        
    
24.        
    
25.         /**
    
26.          * Initializes the Filter.
    
27.          */
    
28.         public void init(FilterConfig filterConfig) throws ServletException {
    
29.                
    
30.                
    
31.         }
    
32.        
    
33.         /**
    
34.          * Standard doFilter object.
    
35.          */
    
36.         public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
    
37.                         throws IOException, ServletException {
    
38.           //logger.info("doFilter");
    
39.          HttpServletRequest req1=(HttpServletRequest)req;
    
40.          HttpServletResponse res1=(HttpServletResponse)res;
    
41.           String contextPath = req1.getContextPath();       
    
42.           String requestUri = req1.getRequestURI();
    
43.           //logger.info("requestUri = " + requestUri);
    
44.          String referer=req1.getHeader("Referer");
    
45.          
    
46.          if(referer!=null&&referer.indexOf("www.java3z.com") < 0&&referer.indexOf("www.xxx.com") < 0){
    
47.             
    
48.                 if(requestUri.indexOf("cwb")!=-1){
    
49.                  res1.sendRedirect(JAVA3Z_URL);
    
50.               }else{
    
51.                   res1.sendRedirect(K_URL);
    
52.               }
    
53.          }else{
    
54.                    chain.doFilter(req, res);
    
55.                 }
    
56.         }
    
57.        
    
58.         public void destroy() {}
    
59.        
    
60.         }
    

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源码下载：http://file.javaxxz.com/2014/10/2/023819875.zip

yj16888

很好的例子，感谢分享