ajax请求或者页面需要缓存，代码如下

缓存页面代码

 1 private void setClientCache(HttpServletResponse response, int maxAgeSec)
 2     {
 3         long maxAgeMill = maxAgeSec * 1000L;
 4         Date now = new Date();
 5         response.setHeader("Cache-Control", "max-age=" + maxAgeSec);
 6         response.addDateHeader("Last-Modified", now.getTime());
 7         response.addDateHeader("Expires", now.getTime() + maxAgeMill);
 8     }