jsp 设置缓存 图片缓存 js缓存 css缓存
package com.elink.control;import java.io.*;import java.util.*;import javax.servlet.*;import javax.servlet.http.*;import com.elink.util.*;/** * @author liubj */public class BusiCacheFilter implements Filter{ private FilterConfig config = null; private HashMap expiresMap = new HashMap(); public void init(FilterConfig filterConfig) { this.config = filterConfig; expiresMap.clear(); Enumeration names = config.getInitParameterNames(); while( names.hasMoreElements() ) { try { String name = (String)names.nextElement(); String value = config.getInitParameter( name ); Integer expire = Integer.valueOf( value ); expiresMap.put( name, expire ); } catch( Exception ex) { } } } public void doFilter( ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest req = (HttpServletRequest) request; HttpServletResponse res = (HttpServletResponse) response; String uri = req.getRequestURI(); String ext = null; int dot = uri.lastIndexOf("."); if( dot != -1 ) { ext = uri.substring( dot+1 ); } setResponseHeader( res, uri, ext ); chain.doFilter(request, response); } public void destroy() { } protected FilterConfig getFilterConfig() { return (config); } private void setResponseHeader( HttpServletResponse response, String uri, String ext ) { if( ext!= null && ext.length() > 0 ) { Integer expires = (Integer)expiresMap.get(ext); if( expires != null ) { LogUtil.logDebug( uri + ".Expires: "+ expires.intValue()); if( expires.intValue() > 0 ) { response.setHeader("Cache-Control","max-age="+expires.intValue()); //HTTP 1.1 } else { response.setHeader("Cache-Control","no-cache"); response.setHeader("Pragma","no-cache"); //HTTP 1.0 response.setDateHeader ("Expires", 0 ); } } } }}?
web.xml
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<filter> <filter-name>busicachefilter</filter-name> <filter-class>com.elink.control.BusiCacheFilter</filter-class> <init-param> <param-name>js</param-name> <param-value>3600</param-value> </init-param> <init-param> <param-name>gif</param-name> <param-value>3600</param-value> </init-param> <init-param> <param-name>jpg</param-name> <param-value>3600</param-value> </init-param> <init-param> <param-name>css</param-name> <param-value>3600</param-value> </init-param> </filter> <filter-mapping> <filter-name>busicachefilter</filter-name> <url-pattern>*.js</url-pattern> </filter-mapping> <filter-mapping> <filter-name>busicachefilter</filter-name> <url-pattern>*.gif</url-pattern> </filter-mapping> <filter-mapping> <filter-name>busicachefilter</filter-name> <url-pattern>*.jpg</url-pattern> </filter-mapping> <filter-mapping> <filter-name>busicachefilter</filter-name> <url-pattern>*.css</url-pattern> </filter-mapping>
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