A simple filter comes to mind:
| package filter;
|
| import java.io.IOException;
| import java.util.ArrayList;
| import java.util.Enumeration;
| import javax.servlet.Filter;
| import javax.servlet.FilterChain;
| import javax.servlet.FilterConfig;
| import javax.servlet.ServletException;
| import javax.servlet.ServletRequest;
| import javax.servlet.ServletResponse;
| import javax.servlet.http.HttpServletResponse;
|
| /** A servlet filter that simply adds all header specified in its config
| to replies the filter is mapped to. An example would be to set the cache
| control max age:
|
| <filter>
| <filter-name>CacheControlFilter</filter-name>
| <filter-class>filter.ReplyHeaderFilter</filter-class>
| <init-param>
| <param-name>Cache-Control</param-name>
| <param-value>max-age=3600</param-value>
| </init-param>
| </filter>
|
| <filter-mapping>
| <filter-name>CacheControlFilter</filter-name>
| <url-pattern>/images/*</url-pattern>
| </filter-mapping>
| <filter-mapping>
| <filter-name>CacheControlFilter</filter-name>
| <url-pattern>*.js</url-pattern>
| </filter-mapping>
|
|
| @author [EMAIL PROTECTED]
| @version $Revison:$
| */
| public class ReplyHeaderFilter implements Filter
| {
| String[][] replyHeaders = {{}};
|
| public void init(FilterConfig config)
| {
| Enumeration names = config.getInitParameterNames();
| ArrayList tmp = new ArrayList();
| while( names.hasMoreElements() )
| {
| String name = (String) names.nextElement();
| String value = config.getInitParameter(name);
| String[] pair = {name, value};
| tmp.add(pair);
| }
| replyHeaders = new String[tmp.size()][2];
| tmp.toArray(replyHeaders);
| }
|
| public void doFilter(ServletRequest request, ServletResponse response,
| FilterChain chain)
| throws IOException, ServletException
| {
| // Apply the headers
| HttpServletResponse httpResponse = (HttpServletResponse) response;
| for(int n = 0; n < replyHeaders.length; n ++)
| {
| String name = replyHeaders[n][0];
| String value = replyHeaders[n][1];
| httpResponse.addHeader(name, value);
| }
| chain.doFilter(request, response);
| }
|
| public void destroy()
| {
| }
| }
|
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