Expires filter ver. 1.4

This is a Java servlet filter (as per Servlet API 2.3). This filter lets you define Expires and max-age headers for your output pages. So with this filter you will be able to define a caching time for your pages. The page will be cached until that time expires.

How to use it:

a) download expflt.jar and save it in WEB-INF/lib

b) describe this filter in your web.xml file. There are two one optional parameters. Parameter expires describes a caching time for your pages in seconds. By default it is 3600 (1 hour).
 


<filter>
  <filter-name>ExpiresFilter</filter-name>
  <filter-class>com.cj.expire.ExpiresFilter</filter-class>
</filter>

or
 


<filter>
  <filter-name>ExpiresFilter</filter-name>
  <filter-class>com.cj.expire.ExpiresFilter</filter-class>
  <init-param>
   <param-name>expires</param-name>
   <param-value>1800</param-value>
  </init-param>
</filter>

Also you may exclude some of your files from the processing. Parameter exclude contains a commas separated list of files excluded from the processing. E.g.:
 


<filter>
  <filter-name>ExpiresFilter</filter-name>
  <filter-class>com.cj.expire.ExpiresFilter</filter-class>
  <init-param>
    <param-name>exclude</param-name>
    <param-value>/main.htm</param-value>
  </init-param>
</filter>

c) describe a mapping for this filter in web.xml.
 


<filter-mapping>
  <filter-name>ExpiresFilter</filter-name>
  <url-pattern>*.gif</url-pattern>
</filter-mapping>

in this case filter will be on for the each .gif file. This trick lets you cache images for your web application.

   For downloading:

    Filter:  expflt.jar
 

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