模块4之使用redis实现页面缓存

简介

　　手动渲染页面，然后将页面添加到redis服务器中，做成页面缓存的功能。SpringWebContext-->thymeleafViewResolver.getTemplateEngine().process();

@RequestMapping(value = "/to_list",produces = "text/html")                                                          //produces+@ResponseBody：产生特定类型的相应
    @ResponseBody
    public String goodsList(Model model, MiaoshaUser user, HttpServletRequest request, HttpServletResponse response){

        String html = redisService.get(GoodsPrefix.getGoodsList,"",String.class);                                  //自动渲染
        if (!StringUtils.isEmpty(html)){
            return html;
        }


        List<GoodsVo> goodslist = miaoshaGoodsService.getGoodsList();                                                   //手动渲染
        model.addAttribute("goodslist",goodslist);
        SpringWebContext ctx = new SpringWebContext(request,response,request.getServletContext(),request.getLocale(),
                model.asMap(),applicationContext);
        html = thymeleafViewResolver.getTemplateEngine().process("goods_list",ctx);
        if (!StringUtils.isEmpty(html)) {
            redisService.set(GoodsPrefix.getGoodsList,"",html);
        }
        return html;
    }