优化 - 热点页面缓存到redis

野性酷女 2022-12-03 13:11 177阅读 0赞

**【原始代码】**

@RequestMapping(value="/to_list", produces="text/html") 
    @ResponseBody
    public String list(HttpServletRequest request,
                       HttpServletResponse response,
                       Model model,
                       BaseUser user) {
    
        System.out.println("to_list 入参，用户信息：" + JSONObject.toJSONString(user));
    
        model.addAttribute("user", user);
    
        // 商品列表
        List<GoodsVo> goodsList =  goodsService.goodsVoList();
    
        model.addAttribute("goodsList", goodsList);
    
        return "goods_list";
    
    }

**【优化后代码】**

@RequestMapping(value="/to_list", produces="text/html")
    @ResponseBody
    public String goodsList(HttpServletRequest request,
                       HttpServletResponse response,
                       Model model,
                       BaseUser user) {
    
        System.out.println("to_list 入参，用户信息：" + JSONObject.toJSONString(user));
    
        model.addAttribute("user", user);
    
        // 商品列表
        List<GoodsVo> goodsList =  goodsService.goodsVoList();
    
        model.addAttribute("goodsList", goodsList);
    
        /**
         * 页面缓存处理 - 先查询缓存，确认缓存中是否有页面缓存
         */
        String html = redisService.get("goods_list", String.class);
    
        if(!StringUtils.isEmpty(html)) {
            return html;
        }
    
        // 如果缓存中没有页面，则开始手动渲染页面
        SpringWebContext ctx = new SpringWebContext(request,
                                                    response,
                                                    request.getServletContext(),
                                                    request.getLocale(),
                                                    model.asMap(),
                                                    applicationContext );
        //手动渲染
        html = thymeleafViewResolver.getTemplateEngine().process("goods_list", ctx);
    
        System.out.println("手动渲染得到的模板html = " + html);
    
        if(!StringUtils.isEmpty(html)) {
            redisService.set(null,"goods_list",html,60); // 缓存一分钟
        }
        return html;
    
    }