@Service 
public class CartServiceImpl implements CartService { 
//服務(wù)url 
@Value("${REST_BASE_URL}") 
private String REST_BASE_URL; 
//商品服務(wù)url 
@Value("${ITEMS_ITEM_URL}") 
private String ITEMS_ITEM_URL; 
//COOKIE中購(gòu)物車(chē)商品對(duì)應(yīng)的key 
@Value("${CART_ITEMS_LIST_KEY}") 
private String CART_ITEMS_LIST_KEY; 
//購(gòu)物車(chē)cookie生存期 
@Value("${CART_ITEMS_EXPIRE_TIME}") 
private Integer CART_ITEMS_EXPIRE_TIME; 
/** 
 * 添加購(gòu)物車(chē)商品 
 * <p>Title: addItem</p> 
 * <p>Description: </p> 
 * @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) { 
//根據(jù)商品id查詢(xún)商品信息 
Item item = getItemById(itemId); 
if (item == null) return TaotaoResult.build(400, "未查詢(xún)到該商品信息"); 
//取cookie中購(gòu)物車(chē)商品列表 
List<Item> cartItems = getItemListFromCookie(request); 
//判斷該商品是否存在于購(gòu)物車(chē)中 
boolean itemExists = false; 
for (Item i : cartItems) { 
if (i.getId().longValue() == itemId.longValue()) { 
//購(gòu)物車(chē)中有此商品 
i.setNum(i.getNum() + 1); 
itemExists = true; 
break; 
} 
} 
//如果商品不存在于購(gòu)物車(chē)則向購(gòu)物車(chē)商品列表中添加一個(gè)商品 
if (! itemExists) { 
//設(shè)置數(shù)量為1 
item.setNum(1); 
//把商品添加到購(gòu)物車(chē) 
cartItems.add(item); 
} 
//把購(gòu)物車(chē)信息寫(xiě)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) { 
//根據(jù)商品id查詢(xún)商品信息 
String resultStr = HttpClientUtil.doGet(REST_BASE_URL + ITEMS_ITEM_URL + itemId); 
//轉(zhuǎn)換成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<Item> getItemListFromCookie(HttpServletRequest request) { 
//取cookie中購(gòu)物車(chē)商品列表 
String cartItemsStr = CookieUtils.getCookieValue(request, CART_ITEMS_LIST_KEY, true); 
//如果不為空那么就轉(zhuǎn)換成java對(duì)象 
List<Item> cartItems = null; 
if (!StringUtils.isBlank(cartItemsStr)) { 
cartItems = JsonUtils.jsonToList(cartItemsStr, Item.class); 
} else { 
cartItems = new ArrayList<>(); 
} 
return cartItems; 
} 
} 

@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); 
//錯(cuò)誤信息 
if (result.getStatus() != 200) { 
model.addAttribute("message", result.getMsg()); 
return "error/exception"; 
} 
//把購(gòu)物車(chē)中的商品傳遞給頁(yè)面 
model.addAttribute("cartList", result.getData()); 
return "cart"; 
} 
} 

/** 
 * 取購(gòu)物車(chē)列表 
 * <p> 
 * Title: getCartItemsList 
 * </p> 
 * <p> 
 * Description: 
 * </p> 
 * 
 * @return 
 * @see com.taotao.portal.service.CartService#getCartItemsList() 
 */ 
@Override 
public List<Item> getCartItemsList(HttpServletRequest request) { 
// 從cookie中取商品列表 
List<Item> itemsList = getItemListFromCookie(request); 
return itemsList; 
} 

@RequestMapping("/cart") 
public String showCart(HttpServletRequest request, Model mode) { 
//取購(gòu)物車(chē)信息 
List<Item> list = cartService.getCartItemsList(request); 
mode.addAttribute("cartList", list); 
return "cart"; 
} 

/** 
 * 修改指定商品的數(shù)量 
 * <p>Title: changeItemNum</p> 
 * <p>Description: </p> 
 * @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) { 
//從cookie中取商品列表 
List<Item> list = getItemListFromCookie(request); 
//從商品列表中找到要修改數(shù)量的商品 
for (Item item : list) { 
if (item.getId() == itemId) { 
//找到商品，修改數(shù)量 
item.setNum(num); 
break; 
} 
} 
//把商品信息寫(xiě)入cookie 
CookieUtils.setCookie(request, response, CART_ITEMS_LIST_KEY, JsonUtils.objectToJson(list), CART_ITEMS_EXPIRE_TIME, true); 
return TaotaoResult.ok(); 
} 

@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; 
} 

/** 
 * 刪除購(gòu)物車(chē)中的商品 
 * <p> 
 * Title: deleteItem 
 * </p> 
 * <p> 
 * Description: 
 * </p> 
 * 
 * @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<Item> deleteItem(Long itemId, HttpServletRequest request, HttpServletResponse response) { 
List<Item> itemsList = getCartItemsList(request); 
// 找到購(gòu)物車(chē)中的商品，并刪除之 
for (Item item : itemsList) { 
if (item.getId().longValue() == itemId.longValue()) { 
itemsList.remove(item); 
break; 
} 
} 
// 更新cookie中的購(gòu)物車(chē)數(shù)據(jù) 
CookieUtils.setCookie(request, response, CART_ITEMS_LIST_KEY, JsonUtils.objectToJson(itemsList), CART_ITEMS_EXPIRE_TIME, true); 
return itemsList; 
} 

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