网站前端 - 控制response的响应头

   使用java开发，一般我们可以通过filter来控制某些内容添加不同的响应头。
   以下的示例示例了如何为不同类型的文件添加不同的Cache-Control。
 

    public class ResponseHeaderFilter implements Filter {  
        FilterConfig fc;   
      
        public void doFilter(ServletRequest req, ServletResponse res,  
                FilterChain chain) throws IOException, ServletException {  
            HttpServletResponse response = (HttpServletResponse) res;  
            // set the provided HTTP response parameters  
            for (Enumeration e = fc.getInitParameterNames(); e.hasMoreElements();) {  
                String headerName = (String) e.nextElement();  
                response.addHeader(headerName, fc.getInitParameter(headerName));  
            }  
            // pass the request/response on  
            chain.doFilter(req, response);  
        }   
      
        public void init(FilterConfig filterConfig) {  
            this.fc = filterConfig;  
        }   
      
        public void destroy() {  
            this.fc = null;  
        }   
      
    }  


web.xml中的配置

     
            NoCache  
            apis.server.common.util.ResponseHeaderFilter  
             
                Cache-Control  
                no-cache, must-revalidate  
             
         
         
            CacheForWeek  
            apis.server.common.util.ResponseHeaderFilter  
             
                Cache-Control  
                max-age=604800, public  
             
         
      
     
            NoCache  
            *.do  
         
         
            CacheForWeek  
            /images/*  
         
         
            CacheForWeek  
            /img/*  
         
         
            CacheForWeek  
            /icons/*  
         
         
            CacheForWeek  
            /ext/*  
         
         
            CacheForWeek  
            *.js  
         
         
            CacheForWeek  
            *.css