CacheImagesFilter


1   /*
2    * WebSessionFilter
3    *
4    * A filter that recognizes return users who have
5    * chosen to have their login information remembered.
6    * Creates a valid WebSession object and
7    * passes it a contact to use to fill its information
8    *
9    */
10  package com.dotmarketing.filters;
11  
12  import java.io.IOException  ;
13  import java.util.GregorianCalendar  ;
14  
15  import javax.servlet.Filter  ;
16  import javax.servlet.FilterChain  ;
17  import javax.servlet.FilterConfig  ;
18  import javax.servlet.ServletException  ;
19  import javax.servlet.ServletRequest  ;
20  import javax.servlet.ServletResponse  ;
21  import javax.servlet.http.HttpServletResponse  ;
22  
23  public class CacheImagesFilter implements Filter   {
24  
25      public void destroy() {
26  
27      }
28  
29      public void doFilter(ServletRequest   req, ServletResponse   res, FilterChain   chain) throws IOException  ,
30              ServletException   {
31          HttpServletResponse   response = (HttpServletResponse  ) res;
32  
33          GregorianCalendar   expiration = new GregorianCalendar  ();
34          expiration.add(java.util.Calendar.MONTH, 1);
35          java.text.SimpleDateFormat   httpDate = new java.text.SimpleDateFormat  ("EEE, dd MMM yyyy HH:mm:ss z");
36  
37          response.setHeader("Expires", httpDate.format(expiration.getTime()));
38          response.setHeader("Cache-Control", "max-age=2592000");
39  
40          chain.doFilter(req, response);
41      }
42  
43      public void init(FilterConfig   config) throws ServletException   {
44  
45      }
46  }
47

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