谷粒商城购物车(三十八)

236 - 247

让人感兴趣的就是线程隔离和拦截器一起用，还有一个就是添加购物车后进行重定向。思路的话，就是临时用户和登录用户的那块逻辑不要忘了，实时增加删减购物车都要对redis进行操作。

ThreadLocal可以查看之前的博客：https://www.cnblogs.com/dalianpai/p/12623044.html

具体的代码如下：

/**
 * @author WGR
 * @create 2020/7/22 -- 16:06
 */
public class CartInterceptor implements HandlerInterceptor {

    public static ThreadLocal<UserInfoVo> threadLocal = new ThreadLocal<>();

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        UserInfoVo userInfoVo = new UserInfoVo();
        HttpSession session = request.getSession();
        MemberRespVo memberRespVo = (MemberRespVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
        if(memberRespVo !=null){
            userInfoVo.setUserId(memberRespVo.getId());
        }

        Cookie[] cookies = request.getCookies();
        if(cookies !=null && cookies.length>0){
            for (Cookie cookie:cookies){
                String name = cookie.getName();
                if(name.equals(CartConstant.TEMP_USER_COOKIE_NAME)){
                    userInfoVo.setUserKey(cookie.getValue());
                    userInfoVo.setTempUser(true);
                }
            }
        }

        if(StringUtils.isBlank(userInfoVo.getUserKey())){
            userInfoVo.setUserKey(UUID.randomUUID().toString());
        }
        threadLocal.set(userInfoVo);
        return true;
    }


    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserInfoVo userInfoVo = threadLocal.get();
        if(!userInfoVo.isTempUser()){
            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME, userInfoVo.getUserKey());
            cookie.setDomain("gulimall.com");
            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT);
            response.addCookie(cookie);
        }

    }
}

web层

/**
 * @author WGR
 * @create 2020/7/22 -- 16:56
 */
@Controller
public class CartController {

    @Autowired
    CartService cartService;

    @GetMapping("/deleteItem")
    public String deleteItem(@RequestParam("skuId") Long skuId){
        cartService.deleteItem(skuId);
        return "redirect:http://cart.gulimall.com/cart.html";
    }

    @GetMapping("/checkCount")
    public String checkCount(@RequestParam("skuId") Long skuId,@RequestParam("num")Integer num){
        cartService.checkCount(skuId,num);
        return "redirect:http://cart.gulimall.com/cart.html";
    }

    @GetMapping("/checkItem")
    public String checkItem(@RequestParam("skuId") Long skuId,@RequestParam("check")Integer check){
        cartService.checkItem(skuId,check);
        return "redirect:http://cart.gulimall.com/cart.html";
    }

    @GetMapping("/cart.html")
    public String cartListPage(Model model) throws ExecutionException, InterruptedException {
        UserInfoVo userInfoVo = CartInterceptor.threadLocal.get();
        Cart cart =  cartService.getCart();
        model.addAttribute("cart",cart);
        return "cartList";
    }

    @GetMapping("/addToCart")
    public  String addToCart(@RequestParam("skuId") Long skuId, @RequestParam("num") Integer num,
                             RedirectAttributes ra) throws ExecutionException, InterruptedException {
       cartService.addToCart(skuId,num);
        ra.addAttribute("skuId",skuId);
        return "redirect:http://cart.gulimall.com/addToCartSuccess.html";
    }

    @GetMapping("/addToCartSuccess.html")
    public String addToCartSuccess(@RequestParam("skuId") Long skuId,Model model){
      CartItem cartItem  = cartService.getCartItem(skuId);
      model.addAttribute("item",cartItem);
      return "success";
    }

}

service

/**
 * @author WGR
 * @create 2020/7/22 -- 16:56
 */
@Controller
public class CartController {

    @Autowired
    CartService cartService;

    @GetMapping("/deleteItem")
    public String deleteItem(@RequestParam("skuId") Long skuId){
        cartService.deleteItem(skuId);
        return "redirect:http://cart.gulimall.com/cart.html";
    }

    @GetMapping("/checkCount")
    public String checkCount(@RequestParam("skuId") Long skuId,@RequestParam("num")Integer num){
        cartService.checkCount(skuId,num);
        return "redirect:http://cart.gulimall.com/cart.html";
    }

    @GetMapping("/checkItem")
    public String checkItem(@RequestParam("skuId") Long skuId,@RequestParam("check")Integer check){
        cartService.checkItem(skuId,check);
        return "redirect:http://cart.gulimall.com/cart.html";
    }

    @GetMapping("/cart.html")
    public String cartListPage(Model model) throws ExecutionException, InterruptedException {
        UserInfoVo userInfoVo = CartInterceptor.threadLocal.get();
        Cart cart =  cartService.getCart();
        model.addAttribute("cart",cart);
        return "cartList";
    }

    @GetMapping("/addToCart")
    public  String addToCart(@RequestParam("skuId") Long skuId, @RequestParam("num") Integer num,
                             RedirectAttributes ra) throws ExecutionException, InterruptedException {
       cartService.addToCart(skuId,num);
        ra.addAttribute("skuId",skuId);
        return "redirect:http://cart.gulimall.com/addToCartSuccess.html";
    }

    @GetMapping("/addToCartSuccess.html")
    public String addToCartSuccess(@RequestParam("skuId") Long skuId,Model model){
      CartItem cartItem  = cartService.getCartItem(skuId);
      model.addAttribute("item",cartItem);
      return "success";
    }

}

效果图如下：