public class PyFilter extends Object implements javax.servlet.Filter
javax.servlet.Filter, and to
 insert them in your servlet container's filter chain, like any Java Filter.
 Example:
/WEB-INF/filters/HeaderFilter.py:
 from javax.servlet import Filter
 # Module must contain a class with the same name as the module
 # which in turn must implement javax.servlet.Filter
 class HeaderFilter (Filter):
   def init(self, config):
       self.header = config.getInitParameter('header')
   def doFilter(self, request, response, chain):
       response.setHeader(self.header, "Yup")
       chain.doFilter(request, response)
 
 web.xml:
 <!-- Initialize the Jython runtime -->
   <listener>
       <listener-class>org.python.util.PyServletInitializer</listener-class>
       <load-on-startup>1</load-on-startup>
   </listener>
 <!-- Declare a uniquely-named PyFilter -->
 <filter>
  <filter-name>HeaderFilter</filter-name>
  <filter-class>org.python.util.PyFilter</filter-class>
  <!-- The special param __filter__ gives the context-relative path to the Jython source file -->
  <init-param>
    <param-name>__filter__</param-name>
    <param-value>/WEB-INF/pyfilter/HeaderFilter.py</param-value>
  </init-param>
  <!-- Other params are passed on the the Jython filter -->
  <init-param>
    <param-name>header</param-name>
    <param-value>X-LookMaNoJava</param-value>
  </init-param>
 </filter>
 <filter-mapping>
  <filter-name>HeaderFilter</filter-name>
  <url-pattern>/*</url-pattern>
 </filter-mapping>
 | Modifier and Type | Field and Description | 
|---|---|
| static String | FILTER_PATH_PARAM | 
| Constructor and Description | 
|---|
| PyFilter() | 
| Modifier and Type | Method and Description | 
|---|---|
| void | destroy() | 
| void | doFilter(javax.servlet.ServletRequest request,
        javax.servlet.ServletResponse response,
        javax.servlet.FilterChain chain) | 
| void | init(javax.servlet.FilterConfig config) | 
public static final String FILTER_PATH_PARAM
public void doFilter(javax.servlet.ServletRequest request,
                     javax.servlet.ServletResponse response,
                     javax.servlet.FilterChain chain)
              throws IOException,
                     javax.servlet.ServletException
doFilter in interface javax.servlet.FilterIOExceptionjavax.servlet.ServletExceptionpublic void init(javax.servlet.FilterConfig config)
          throws javax.servlet.ServletException
init in interface javax.servlet.Filterjavax.servlet.ServletExceptionpublic void destroy()
destroy in interface javax.servlet.Filter