SpringBoot 1.5+Thymeleaf+redis实现

思路

现在redis中查询是否有缓存的页面代码，如果有就直接返回redis中存储的包含页面数据的页面代码。如果redis中没有的话，就查询一次数据库，并生成包含页面数据的html代码，存储的redis数据库并返回给浏览器。

存储在redis中的html代码.png

核心代码：

 //    手动渲染带数据的模板页面
        SpringWebContext springWebContext = new SpringWebContext(request, response, request.getServletContext(), request.getLocale(), model.asMap(), applicationContext);
        html = thymeleafViewResolver.getTemplateEngine().process("goods_list", springWebContext);

Demo.java

package cn.sitcat.Controller;

import cn.sitcat.domain.MiaoshaUser;
import cn.sitcat.redis.GoodsKey;
import cn.sitcat.redis.RedisService;
import cn.sitcat.service.GoodsService;
import cn.sitcat.vo.GoodsVo;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.thymeleaf.spring4.context.SpringWebContext;
import org.thymeleaf.spring4.view.ThymeleafViewResolver;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;


/**
 * @author Hiseico
 * @create 2018-08-09 下午5:47
 * @desc 商品页面
 **/
@Controller
@RequestMapping("/goods")
public class GoodsController {
    @Autowired
    GoodsService goodsService;
    @Autowired
    RedisService redisService;
    @Autowired
    ThymeleafViewResolver thymeleafViewResolver;
    @Autowired
    ApplicationContext applicationContext;


    @RequestMapping(value = "/to_list", produces = "text/html")
    @ResponseBody
    public String toList(HttpServletRequest request, HttpServletResponse response, Model model, MiaoshaUser user) {
        if (user == null) {
            return "login";
        }
        model.addAttribute("user", user);

        /**
         * 有缓存的情况
         */

        //现查询页面及页面数据是否缓存到redis  取缓存
        String html = redisService.get(GoodsKey.getGoodsList, "", String.class);
        if (!StringUtils.isEmpty(html)) {
            return html;
        }

        /**
         * 没缓存的情况
         */
        //查询商品列表
        List<GoodsVo> list = goodsService.goodsVoList();
        model.addAttribute("goodsList", list);

        //    当缓存中没有数据的时候 手动渲染
        SpringWebContext springWebContext = new SpringWebContext(request, response, request.getServletContext(), request.getLocale(), model.asMap(), applicationContext);
        html = thymeleafViewResolver.getTemplateEngine().process("goods_list", springWebContext);
        if (!StringUtils.isEmpty(html)) {
            redisService.set(GoodsKey.getGoodsList, "", html);
        }
        return html;
    }

    @RequestMapping(value = "/to_detail/{goodsId}", produces = "text/html") //返回html
    @ResponseBody
    public String detail(HttpServletResponse response, HttpServletRequest request, Model model, MiaoshaUser user, @PathVariable("goodsId") long goodsId) {
        if (user == null) {
            return "login";
        }
        model.addAttribute("user", user);

        /**
         * 有缓存的情况
         */

        //现查询页面及页面数据是否缓存到redis  取缓存
        String html = redisService.get(GoodsKey.getGoodsDetail, ""+goodsId, String.class);
        if (!StringUtils.isEmpty(html)) {
            return html;
        }



        /**
         * 没缓存的情况
         */
        GoodsVo goods = goodsService.getGoodsVoByGoodsId(goodsId);
        model.addAttribute("goods", goods);
        //秒杀开始结束时间，getTime转换为毫秒
        long startAt = goods.getStartDate().getTime();
        long endAt = goods.getEndDate().getTime();
        long now = System.currentTimeMillis();

        int miaoshaStatus = 0;//还没开始为0  已经结束为2  进行中为1
        int remainSeconds = 0;//计算还有多少秒开始

        if (now < startAt) {//秒杀还没开始，倒计时
            miaoshaStatus = 0;
            remainSeconds = (int) ((startAt - now) / 1000);
        } else if (now > endAt) {//秒杀已经结束
            miaoshaStatus = 2;
            remainSeconds = -1;
        } else {//秒杀进行中
            miaoshaStatus = 1;
            remainSeconds = 0;
        }
        model.addAttribute("miaoshaStatus", miaoshaStatus);
        model.addAttribute("remainSeconds", remainSeconds);

        //    当缓存中没有数据的时候 手动渲染
        SpringWebContext springWebContext = new SpringWebContext(request, response, request.getServletContext(), request.getLocale(), model.asMap(), applicationContext);
        html = thymeleafViewResolver.getTemplateEngine().process("goods_detail", springWebContext);
        if (!StringUtils.isEmpty(html)) {
            redisService.set(GoodsKey.getGoodsDetail, ""+goodsId, html);
        }
        return html;
    }
}