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购物车功能

程序员文章站 2024-03-20 14:12:28
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@Controller
public class CartController {

    @Value("${COOKIE_CART_EXPIRE}")
    private Integer COOKIE_CART_EXPIRE;

    @Autowired
    private ItemService itemService;
    @Autowired
    private CartService cartService;

    @RequestMapping("/cart/add/{itemId}")
    public String addCart(@PathVariable Long itemId, @RequestParam(defaultValue="1")Integer num,
            HttpServletRequest request, HttpServletResponse response) {
        //判断用户是否登录
        TbUser user = (TbUser) request.getAttribute("user");
        //如果是登录状态,把购物车写入redis
        if (user != null) {
            //保存到服务端
            cartService.addCart(user.getId(), itemId, num);
            //返回逻辑视图
            return "cartSuccess";
        }
        //如果未登录使用cookie
        //从cookie中取购物车列表
        List<TbItem> cartList = getCartListFromCookie(request);
        //判断商品在商品列表中是否存在
        boolean flag = false;
        for (TbItem tbItem : cartList) {
            //如果存在数量相加
            if (tbItem.getId() == itemId.longValue()) {
                flag = true;
                //找到商品,数量相加
                tbItem.setNum(tbItem.getNum() + num);
                //跳出循环
                break;
            }
        }
        //如果不存在
        if (!flag) {
            //根据商品id查询商品信息。得到一个TbItem对象
            TbItem tbItem = itemService.getItemById(itemId);
            //设置商品数量
            tbItem.setNum(num);
            //取一张图片
            String image = tbItem.getImage();
            if (StringUtils.isNotBlank(image)) {
                tbItem.setImage(image.split(",")[0]);
            }
            //把商品添加到商品列表
            cartList.add(tbItem);
        }
        //写入cookie
        CookieUtils.setCookie(request, response, "cart", JsonUtils.objectToJson(cartList), COOKIE_CART_EXPIRE, true);
        //返回添加成功页面
        return "cartSuccess";
    }

    /**
     * 从cookie中取购物车列表的处理
     * <p>Title: getCartListFromCookie</p>
     * <p>Description: </p>
     * @param request
     * @return
     */
    private List<TbItem> getCartListFromCookie(HttpServletRequest request) {
        String json = CookieUtils.getCookieValue(request, "cart", true);
        //判断json是否为空
        if (StringUtils.isBlank(json)) {
            return new ArrayList<>();
        }
        //把json转换成商品列表
        List<TbItem> list = JsonUtils.jsonToList(json, TbItem.class);
        return list;
    }

    /**
     * 展示购物车列表
     * <p>Title: showCatList</p>
     * <p>Description: </p>
     * @param request
     * @return
     */
    @RequestMapping("/cart/cart")
    public String showCatList(HttpServletRequest request, HttpServletResponse response) {
        //从cookie中取购物车列表
        List<TbItem> cartList = getCartListFromCookie(request);
        //判断用户是否为登录状态
        TbUser user = (TbUser) request.getAttribute("user");
        //如果是登录状态
        if (user != null) {
            //从cookie中取购物车列表
            //如果不为空,把cookie中的购物车商品和服务端的购物车商品合并。
            cartService.mergeCart(user.getId(), cartList);
            //把cookie中的购物车删除
            CookieUtils.deleteCookie(request, response, "cart");
            //从服务端取购物车列表
            cartList = cartService.getCartList(user.getId());

        }
        //把列表传递给页面
        request.setAttribute("cartList", cartList);
        //返回逻辑视图
        return "cart";
    }

    /**
     * 更新购物车商品数量
     */
    @RequestMapping("/cart/update/num/{itemId}/{num}")
    @ResponseBody
    public E3Result updateCartNum(@PathVariable Long itemId, @PathVariable Integer num
            , HttpServletRequest request ,HttpServletResponse response) {
        //判断用户是否为登录状态
        TbUser user = (TbUser) request.getAttribute("user");
        if (user != null) {
            cartService.updateCartNum(user.getId(), itemId, num);
            return E3Result.ok();
        }
        //从cookie中取购物车列表
        List<TbItem> cartList = getCartListFromCookie(request);
        //遍历商品列表找到对应的商品
        for (TbItem tbItem : cartList) {
            if (tbItem.getId().longValue() == itemId) {
                //更新数量
                tbItem.setNum(num);
                break;
            }
        }
        //把购物车列表写回cookie
        CookieUtils.setCookie(request, response, "cart", JsonUtils.objectToJson(cartList), COOKIE_CART_EXPIRE, true);
        //返回成功
        return E3Result.ok();
    }

    /**
     * 删除购物车商品
     */
    @RequestMapping("/cart/delete/{itemId}")
    public String deleteCartItem(@PathVariable Long itemId, HttpServletRequest request,
            HttpServletResponse response) {
        //判断用户是否为登录状态
        TbUser user = (TbUser) request.getAttribute("user");
        if (user != null) {
            cartService.deleteCartItem(user.getId(), itemId);
            return "redirect:/cart/cart.html";
        }
        //从cookie中取购物车列表
        List<TbItem> cartList = getCartListFromCookie(request);
        //遍历列表,找到要删除的商品
        for (TbItem tbItem : cartList) {
            if (tbItem.getId().longValue() == itemId) {
                //删除商品
                cartList.remove(tbItem);
                //跳出循环
                break;
            }
        }
        //把购物车列表写入cookie
        CookieUtils.setCookie(request, response, "cart", JsonUtils.objectToJson(cartList), COOKIE_CART_EXPIRE, true);
        //返回逻辑视图
        return "redirect:/cart/cart.html";
    }
}

解决请求*.html后缀无法返回json数据的问题,报406错误
在springmvc中请求*.html不可以返回json数据。
修改web.xml,添加url拦截格式为action后缀。