通过Filter设置HTTP hander中的cache-control

  <filter>  <filter-name>cache-control</filter-name>  <filter-class>com.hibtest6.filter.CacheControl</filter-class>  <init-param>  <param-name>.css</param-name>  <param-value>520</param-value>  </init-param>  <init-param>  <param-name>.gif</param-name>  <param-value>520</param-value>  </init-param>  <init-param>  <param-name>.js</param-name>  <param-value>520</param-value>  </init-param>  </filter>  <filter-mapping>  <filter-name>cache-control</filter-name>  <url-pattern>*.css</url-pattern>  </filter-mapping>  <filter-mapping>  <filter-name>cache-control</filter-name>  <url-pattern>*.gif</url-pattern>  </filter-mapping>  <filter-mapping>  <filter-name>cache-control</filter-name>  <url-pattern>*.js</url-pattern>  </filter-mapping>

public class CacheControl implements Filter{private Map map = new HashMap<String, Long>();public void destroy() {System.out.println("destroy");}public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {HttpServletRequest httpServletRequest = (HttpServletRequest) request;String requestUri = httpServletRequest.getRequestURI();//SSH2/js/easyui.cssString cache = httpServletRequest.getHeader("cache-Control");if(requestUri.lastIndexOf(".")!=-1){String str = requestUri.substring(requestUri.lastIndexOf(".") , requestUri.length());Long strValue = (Long) map.get(str);if(strValue!=null){HttpServletResponse httpServletResponse = (HttpServletResponse) response;httpServletResponse.setHeader("Cache-Control", "max-age="+strValue);httpServletResponse.setDateHeader("Expires", System.currentTimeMillis()+strValue*1000);response = httpServletResponse;}}chain.doFilter(request, response);}public void init(FilterConfig filterConfig) throws ServletException {Enumeration enumeration = filterConfig.getInitParameterNames();while(enumeration.hasMoreElements()){String eleName = (String) enumeration.nextElement();if(eleName==null || eleName==""){continue;}String eleValue = filterConfig.getInitParameter(eleName);Long eleValueLong = Long.parseLong(eleValue); if(eleValueLong>0){map.put(eleName, eleValueLong);}}System.out.println(map);System.out.println("init");}}