带你逐步深入了解SSM框架——淘淘商城项目之购物车+订单实现

1   今日大纲

1、  实现淘淘商城的购物车功能

2、  实现订单系统。

2   购物车功能

2.1  功能说明

1、商品加入购物车时，不是必须要求登录。

2、计算购物车中商品的总价。当商品数量发生变化时需要重新计算。

3、用户可以删除购物车中的商品。

4、用户下单后，删除购物车的功能。

2.2  功能分析

1、在用户不登陆的清空下也可以使用购物车，那么就需要把购物车信息放入cookie中。

2、可以把商品信息，存放到pojo中，然后序列化成json存入cookie中。

3、取商品信息可以从cookie中把json数据取出来，然后转换成java对象即可。

4、此功能只需要操作cookie不需要数据库的支持，所以只需要在taotao-portal中实现即可。

5、购物车分有四种动作

a)        添加商品

b)        修改商品数量

c)        删除购物车中的商品

d)        展示购物车商品列表

 

2.3  添加购物车商品

2.3.1  service

功能：

1、接收controller传递过来的商品id，根据商品id查询商品信息。

2、从cookie中取出购物车信息，转换成商品pojo列表。

3、把商品信息添加到商品列表中。

参数：

1、商品id

2、Request

3、response

返回值：

TaoTaoResult

 

@Service public class CartServiceImpl implements CartService {             //服务url       @Value("${REST_BASE_URL}")       private String REST_BASE_URL;       //商品服务url       @Value("${ITEMS_ITEM_URL}")       private String ITEMS_ITEM_URL;       //COOKIE中购物车商品对应的key       @Value("${CART_ITEMS_LIST_KEY}")       private String CART_ITEMS_LIST_KEY;       //购物车cookie生存期       @Value("${CART_ITEMS_EXPIRE_TIME}")       private Integer CART_ITEMS_EXPIRE_TIME;       /**        * 添加购物车商品        * Title: addItem        * Description:        * @param itemId        * @param request        * @param response        * @return        * @see com.taotao.portal.service.CartService#addItem(java.lang.Long, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)        */       @Override       public TaotaoResult addItem(Long itemId, HttpServletRequest request, HttpServletResponse response) {            //根据商品id查询商品信息            Item item = getItemById(itemId);            if (item == null) return TaotaoResult.build(400, "未查询到该商品信息");            //取cookie中购物车商品列表            List cartItems = getItemListFromCookie(request);            //判断该商品是否存在于购物车中            boolean itemExists = false;            for (Item i : cartItems) {                  if (i.getId().longValue() == itemId.longValue()) {                       //购物车中有此商品                       i.setNum(i.getNum() + 1);                       itemExists = true;                       break;                  }                         }            //如果商品不存在于购物车则向购物车商品列表中添加一个商品            if (! itemExists) {                  //设置数量为1                  item.setNum(1);                  //把商品添加到购物车                  cartItems.add(item);            }            //把购物车信息写入cookie中            CookieUtils.setCookie(request, response, CART_ITEMS_LIST_KEY, JsonUtils.objectToJson(cartItems), CART_ITEMS_EXPIRE_TIME, true);                       return TaotaoResult.ok(cartItems);       }             private Item getItemById(Long itemId) {            //根据商品id查询商品信息            String resultStr = HttpClientUtil.doGet(REST_BASE_URL + ITEMS_ITEM_URL + itemId);            //转换成taotaoResult            TaotaoResult result = TaotaoResult.formatToPojo(resultStr, Item.class);            //取商品信息            Item item  = null;            if (result.getStatus() == 200) {                  item = (Item) result.getData();            }                 return item;       }             private List getItemListFromCookie(HttpServletRequest request) {            //取cookie中购物车商品列表            String cartItemsStr = CookieUtils.getCookieValue(request, CART_ITEMS_LIST_KEY, true);            //如果不为空那么就转换成java对象            List cartItems = null;            if (!StringUtils.isBlank(cartItemsStr)) {                  cartItems = JsonUtils.jsonToList(cartItemsStr, Item.class);            } else {                  cartItems = new ArrayList<>();            }            return cartItems;       } }

 

2.3.2  商品pojo

商品pojo需要使用taotao-portal中的Item。此pojo在反序列化时会抛异常。需要做如下修改：

2.3.3  Controller

@Controller @RequestMapping("/cart") public class CartController {         @Autowired       private CartService cartService;             @RequestMapping("/add/{itemId}")       public String addItem(@PathVariable Long itemId,                  HttpServletRequest request, HttpServletResponse response, Model model) {            //添加商品信息            TaotaoResult result = cartService.addItem(itemId, request, response);            //错误信息            if (result.getStatus() != 200) {                  model.addAttribute("message", result.getMsg());                  return "error/exception";            }            //把购物车中的商品传递给页面            model.addAttribute("cartList", result.getData());            return "cart";       }      }

2.4  展示购物车商品

用户点击“我的购物车”展示购物车信息

 

2.4.1  Service

/**        * 取购物车列表        *        * Title: getCartItemsList        *        *        * Description:        *        * @return        * @see com.taotao.portal.service.CartService#getCartItemsList()        */       @Override       public List getCartItemsList(HttpServletRequest request) {            // 从cookie中取商品列表            List itemsList = getItemListFromCookie(request);            return itemsList;       }

 

2.4.2  Controller

@RequestMapping("/cart")       public String showCart(HttpServletRequest request, Model mode) {            //取购物车信息            List list = cartService.getCartItemsList(request);            mode.addAttribute("cartList", list);            return "cart";       }

 

 

2.5  修改商品数量

当点击购物车商品的“+”、“-”号时增加或减少商品数量。减少商品数量时，如果数量为“1”则不继续减少。

2.5.1  Service

/**        * 修改指定商品的数量        * Title: changeItemNum        * Description:        * @param itemId        * @param num        * @param request        * @param response        * @return        * @see com.taotao.portal.service.CartService#changeItemNum(long, int, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)        */       @Override       public TaotaoResult changeItemNum(long itemId, int num, HttpServletRequest request, HttpServletResponse response) {            //从cookie中取商品列表            List list = getItemListFromCookie(request);            //从商品列表中找到要修改数量的商品            for (Item item : list) {                  if (item.getId() == itemId) {                       //找到商品，修改数量                       item.setNum(num);                       break;                  }            }            //把商品信息写入cookie            CookieUtils.setCookie(request, response, CART_ITEMS_LIST_KEY, JsonUtils.objectToJson(list), CART_ITEMS_EXPIRE_TIME, true);                       return TaotaoResult.ok();       }

 

2.5.2  Controller

@RequestMapping("/update/num/{itemId}/{num}")       @ResponseBody       public TaotaoResult updateNumById(@PathVariable Long itemId, @PathVariable Integer num,                  HttpServletRequest request, HttpServletResponse response) {            TaotaoResult result = cartService.changeItemNum(itemId, num, request, response);            return result;       }

 

2.6  删除购物车商品

2.6.1  Service

/**        * 删除购物车中的商品        *        * Title: deleteItem        *        *        * Description:        *        *        * @param itemId        * @param request        * @param response        * @return        * @see com.taotao.portal.service.CartService#deleteItem(java.lang.Long,        *      javax.servlet.http.HttpServletRequest,        *      javax.servlet.http.HttpServletResponse)        */       @Override       public List deleteItem(Long itemId, HttpServletRequest request, HttpServletResponse response) {            List itemsList = getCartItemsList(request);            // 找到购物车中的商品，并删除之            for (Item item : itemsList) {                  if (item.getId().longValue() == itemId.longValue()) {                       itemsList.remove(item);                       break;                  }            }            // 更新cookie中的购物车数据            CookieUtils.setCookie(request, response, CART_ITEMS_LIST_KEY, JsonUtils.objectToJson(itemsList), CART_ITEMS_EXPIRE_TIME, true);            returnitemsList;       }

 

2.6.2  Controller

@RequestMapping("/delete/{itemId}")       public String deleteItemById(@PathVariable Long itemId,                  HttpServletRequest request, HttpServletResponse response,                  Model model) {            List list = cartService.deleteItem(itemId, request, response);            model.addAttribute("cartList", list);            return "cart";       }

 

3   订单系统实现

3.1  系统架构

3.2  订单表结构

订单表：

 

订单商品表：

 

物流表：

 

3.3  接口

参见：淘淘商城-订单系统接口.docx

 

3.4  创建订单系统taotao-order

 

系统配置参考taotao-sso系统。

 

3.5  实现创建订单接口

3.5.1  service

@Service public class OrderServiceImpl implements OrderService {         @Autowired       private TbOrderMapper orderMapper;       @Autowired       private TbOrderItemMapper orderItemMapper;       @Autowired       private TbOrderShippingMapper orderShippingMapper;       //redis中的订单key       @Value("${ORDER_ID_KEY}")       private String ORDER_ID_KEY;       @Value("${ORDER_BEGIN_ID}")       private Long ORDER_BEGIN_ID;             @Autowired       private JedisCluster jedisCluster;             @Override       public TaotaoResult createOrder(TbOrder order, List itemList, TbOrderShipping orderShipping) {                       //订单表            //生成订单号            String orderIdStr = jedisCluster.get(ORDER_ID_KEY);            Long orderId = null;            if (StringUtils.isBlank(orderIdStr)) {                  //如果redis中没有订单号使用初始订单号初始化                  jedisCluster.set(ORDER_ID_KEY, ORDER_BEGIN_ID.toString());                  orderId = ORDER_BEGIN_ID;            } else {                  //生成订单号                  orderId = jedisCluster.incr(ORDER_ID_KEY);            }            //设置订单号            order.setOrderId(orderId.toString());            Date date = new Date();            //订单创建时间            order.setCreateTime(date);            //订单更新时间            order.setUpdateTime(date);            //插入订单表            orderMapper.insert(order);            //插入订单商品表            for (TbOrderItem tbOrderItem : itemList) {                  //取订单商品id                  Long orderItemId = jedisCluster.incr("ORDER_ITEM_ID");                  tbOrderItem.setId(orderItemId.toString());                  tbOrderItem.setOrderId(orderId.toString());                  //添加到订单商品表                  orderItemMapper.insert(tbOrderItem);            }            //插入物流表            orderShipping.setOrderId(orderId.toString());            orderShipping.setCreated(date);            orderShipping.setUpdated(date);            orderShippingMapper.insert(orderShipping);                       return TaotaoResult.ok(orderId.toString());       } }

 

3.5.2  Controller

3.5.2.1        Pojo

 

public class Order extends TbOrder{         private List orderItems;       private TbOrderShipping orderShipping; }

 

3.5.2.2        controller

 

@Controller @RequestMapping("/order") public class OrderController {         @Autowired       private OrderService orderService;             @RequestMapping(value = "/create", method=RequestMethod.POST)       @ResponseBody       public TaotaoResult createOrder(@RequestBody Order order) {            TaotaoResult result = null;            try {                  result = orderService.createOrder(order, order.getOrderItems(), order.getOrderShipping());             } catch (Exception e) {                  e.printStackTrace();                  return TaotaoResult.build(500, ExceptionUtil.getStackTrace(e));            }            return result;       } }

 

3.6  其他接口

4   前端系统实现下单功能

4.1  下单流程

4.2  订单结算页面

4.2.1  Controller

@Controller @RequestMapping("/order") public class OrderController {         @Autowired       private OrderService orderService;       @Autowired       private CartService cartService;             /**        * 显示订单确认画面        * Title: showOrderCart        * Description:        * @param request        * @param model        * @return        */       @RequestMapping("/order-cart")       public String showOrderCart(HttpServletRequest request, TbUser user, Model model) {            //根据用户信息，取出用户的收货地址列表            //本项目中使用静态数据模拟。。。。                       //从cookie中把商品列表取出来            List itemsList = cartService.getCartItemsList(request);            model.addAttribute("cartList", itemsList);            return"order-cart";       } }

 

4.3  提交订单处理

4.3.1  创建订单Service

@Srvice public class OrderServiceImpl implements OrderService {         @Value("${ORDER_BASE_URL}")       private String ORDER_BASE_URL;             @Value("${ORDER_CREATE_URL}")       private String ORDER_CREATE_URL;             @Override       public TaotaoResult createService(Order order) {                       //把pojo转换成json数据            String json = JsonUtils.objectToJson(order);            //调用订单系统服务提交订单            String resultStr = HttpClientUtil.doPostJson(ORDER_BASE_URL + ORDER_CREATE_URL, json);            //转换成java对象            TaotaoResult taotaoResult = TaotaoResult.format(resultStr);                       returntaotaoResult;       } }

 

4.3.2  Controller

@RequestMapping(value="/create", method=RequestMethod.POST)       public String createOrder(HttpServletRequest request, Order order, Model model) {            //从request中取用户信息            TbUser user = (TbUser)request.getAttribute("user");            //把用户信息补充到order对象中            order.setUserId(user.getId());            order.setBuyerNick(user.getUsername());                       //提交订单            TaotaoResult result = null;            try {                  result = orderService.createService(order);                  //订单创建成功                  if(result.getStatus() == 200) {                       model.addAttribute("orderId", result.getData());                       model.addAttribute("payment", order.getPayment());                       //两天后送达                        DateTime dateTime = new DateTime();                       dateTime = dateTime.plusDays(2);                       model.addAttribute("date", dateTime.toString("yyyy-MM-dd"));                       return "success";                  }            } catch (Exception e) {                  e.printStackTrace();                  result = TaotaoResult.build(500, ExceptionUtil.getStackTrace(e));            }            //订单创建失败            model.addAttribute("message", result.getMsg());            return "error/exception";              }