针对网页分类条目的动态加载，图为页面的Head部分。
//categoryListServlet准备分类数据ProductService service = new ProductService();List<Category> categoryList = service.findAllCategoryList();response.setContentType("text/html; charset=utf-8");Gson gson = new Gson();String json = gson.toJson(categoryList);response.getWriter().write(json);head.jsp异步加载js部分：
<script type="text/javascript"> ?????????//head.jsp加载完成后，ajax异步加载分类条 ?????????$(function(){ ???????????????????????????var content= ""; ?????????????$.post( ?????????????????????"${pageContext.request.contextPath}/categoryList", ?????????????????????function(data){ ?????????????????????????//[{"cid":"xxx","cname":"aaa"},{"cid":"xxx","cname":"aaa"}] ?????????????????????????for(var i=0;i<data.length;i++){ ?????????????????????????????content += "<li><a href=‘#‘>"+data[i].cname+"</a></li>"; ?????????????????????????} ?????????????????????????//将拼接好的类别，写入到页面 ?????????????????????????$("#categoryUI").html(content); ???????????????????????}, ?????????????????????"json" ?????????????); ???????????????????????}); ???????????????????????</script>缓存逻辑：
1.查询缓存中有无分类数据
2.有，直接查询缓存；
无，则通过hibernate查询，并添加到缓存中
3.将查询到的数据返回。
//查询缓存中有无分类数据，如果没有查询写入缓存Jedis jedis = JedisPoolUtils.getJedis();String categoryListJson = jedis.get("categoryListJson");if(categoryListJson == null){ ???System.out.println("缓存没有数据 查询数据库"); ???ProductService service = new ProductService(); ???List<Category> categoryList = service.findAllCategoryList(); ???Gson gson = new Gson(); ???categoryListJson = gson.toJson(categoryList); ???jedis.set("categoryListJson", categoryListJson);}//准备分类数据 ???response.setContentType("text/html; charset=utf-8");response.getWriter().write(categoryListJson);Ajax异步加载数据及Redis缓存
原文地址：https://www.cnblogs.com/zemul/p/10215978.html