商城业务--> 购物车 - ThreadLocal用户身份鉴别

kkmall-cart/src/main/java/name/lkk/kkmall/cart/KkmallCartApplication.java

@@ -4,9 +4,11 @@ import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
 import org.springframework.cloud.openfeign.EnableFeignClients;
+import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession;
 
 @SpringBootApplication
 @EnableDiscoveryClient
+@EnableRedisHttpSession
 @EnableFeignClients("name.lkk.kkmall.cart.feign")
 public class KkmallCartApplication {
 

kkmall-cart/src/main/java/name/lkk/kkmall/cart/config/CartWebConfig.java

@@ -0,0 +1,22 @@
+package name.lkk.kkmall.cart.config;
+
+import name.lkk.kkmall.cart.interceptor.CartInterceptor;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+/**
+ * @author: kirklin
+ * @date: 2021/7/10 3:33 下午
+ * @description: 添加拦截器
+ */
+@Configuration
+public class CartWebConfig implements WebMvcConfigurer {
+
+    @Override
+    public void addInterceptors(InterceptorRegistry registry) {
+        WebMvcConfigurer.super.addInterceptors(registry);
+        registry.addInterceptor(new CartInterceptor()).addPathPatterns("/**");
+
+    }
+}

kkmall-cart/src/main/java/name/lkk/kkmall/cart/controller/CartController.java

@@ -0,0 +1,38 @@
+package name.lkk.kkmall.cart.controller;
+
+import lombok.extern.slf4j.Slf4j;
+import name.lkk.kkmall.cart.interceptor.CartInterceptor;
+import name.lkk.kkmall.cart.to.UserInfoTo;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+
+/**
+ * @author: kirklin
+ * @date: 2021/7/10 3:39 下午
+ * @description:
+ */
+@Slf4j
+@Controller
+public class CartController {
+
+    /**
+     * 去购物车页面的请求
+     * 浏览器有一个cookie:user-key 标识用户的身份，一个月过期
+     * 如果第一次使用jd的购物车功能，都会给一个临时的用户身份:
+     * 浏览器以后保存，每次访问都会带上这个cookie；
+     * <p>
+     * 登录：session有
+     * 没登录：按照cookie里面带来user-key来做
+     * 第一次，如果没有临时用户，自动创建一个临时用户
+     *
+     * @return
+     */
+    @GetMapping({"/", "/cart.html"})
+    public String carListPage() {
+        //快速得到用户信息：id,user-key
+        UserInfoTo userInfoTo = CartInterceptor.userInfoToThreadLocal.get();
+        log.info(userInfoTo.toString());
+        return "cartList";
+    }
+
+}

kkmall-cart/src/main/java/name/lkk/kkmall/cart/interceptor/CartInterceptor.java

@@ -0,0 +1,70 @@
+package name.lkk.kkmall.cart.interceptor;
+
+import name.lkk.common.constant.AuthServerConstant;
+import name.lkk.common.constant.CartConstant;
+import name.lkk.common.constant.DomainConstant;
+import name.lkk.common.vo.MemberRsepVo;
+import name.lkk.kkmall.cart.to.UserInfoTo;
+import org.springframework.util.ObjectUtils;
+import org.springframework.web.servlet.HandlerInterceptor;
+import org.springframework.web.servlet.ModelAndView;
+
+import javax.servlet.http.Cookie;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.HttpSession;
+import java.util.UUID;
+
+/**
+ * @author: kirklin
+ * @date: 2021/7/10 3:12 下午
+ * @description: 购物车拦截器。在执行业务之前 判断用户是否登录,并使用ThreadLocal封装UserInfoTo
+ */
+public class CartInterceptor implements HandlerInterceptor {
+    public static ThreadLocal<UserInfoTo> userInfoToThreadLocal = new InheritableThreadLocal<>();
+
+    @Override
+    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
+        UserInfoTo userInfoTo = new UserInfoTo();
+        HttpSession session = request.getSession();
+        MemberRsepVo user = (MemberRsepVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
+        if (user != null) {
+            //用户已经登陆了
+            userInfoTo.setUsername(user.getUsername());
+            userInfoTo.setUserId(user.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)) {
+                    userInfoTo.setUserKey(cookie.getValue());
+                    userInfoTo.setTempUser(true);
+                }
+            }
+        }
+        if (ObjectUtils.isEmpty(userInfoTo.getUserKey())) {
+            String uuid = UUID.randomUUID().toString().replace("-", "");
+            userInfoTo.setUserKey(uuid);
+        }
+        userInfoToThreadLocal.set(userInfoTo);
+        return HandlerInterceptor.super.preHandle(request, response, handler);
+    }
+
+    /**
+     * 执行完毕之后分配临时用户让浏览器保存
+     */
+    @Override
+    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
+        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
+        UserInfoTo userInfoTo = userInfoToThreadLocal.get();
+        userInfoToThreadLocal.remove();
+        if (!userInfoTo.isTempUser()) {
+            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME, userInfoTo.getUserKey());
+            // 设置这个cookie作用域 过期时间
+            cookie.setDomain(DomainConstant.MALL_DOMAIN);
+            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIME_OUT);
+            response.addCookie(cookie);
+        }
+    }
+}

kkmall-cart/src/main/java/name/lkk/kkmall/cart/to/UserInfoTo.java

@@ -0,0 +1,32 @@
+package name.lkk.kkmall.cart.to;
+
+import lombok.Data;
+import lombok.ToString;
+
+/**
+ * @author kirklin
+ */
+@ToString
+@Data
+public class UserInfoTo {
+
+    /**
+     * 存储已登录用户在数据库中的ID
+     */
+    private Long userId;
+
+    /**
+     * 存储用户名
+     */
+    private String username;
+
+    /**
+     * 配分一个临时的user-key
+     */
+    private String userKey;
+
+    /**
+     * 判断是否是临时用户
+     */
+    private boolean tempUser = false;
+}

kkmall-cart/src/main/java/name/lkk/kkmall/cart/vo/Cart.java

@@ -0,0 +1,87 @@
+package name.lkk.kkmall.cart.vo;
+
+import java.math.BigDecimal;
+import java.util.List;
+
+/**
+ * 购物车，！本VO的GET，SET方法非默认实现。
+ */
+public class Cart {
+
+	private List<CartItem> items;
+
+	/**
+	 * 商品的数量
+	 */
+	private Integer countNum;
+
+	/**
+	 * 商品的类型数量
+	 */
+	private Integer countType;
+
+	/**
+	 * 整个购物车的总价
+	 */
+	private BigDecimal totalAmount;
+
+	/**
+	 * 减免的价格
+	 */
+	private BigDecimal reduce = new BigDecimal("0.00");
+
+
+	public List<CartItem> getItems() {
+		return items;
+	}
+
+	public void setItems(List<CartItem> items) {
+		this.items = items;
+	}
+
+	/**
+	 * 计算商品的总量
+	 *
+	 * @return
+	 */
+	public Integer getCountNum() {
+		int count = 0;
+		if (this.items != null && this.items.size() > 0) {
+			for (CartItem item : this.items) {
+				count += item.getCount();
+			}
+		}
+		return count;
+	}
+
+	public Integer getCountType() {
+		int count = 0;
+		if (this.items != null && this.items.size() > 0) {
+			for (CartItem item : this.items) {
+				count += 1;
+			}
+		}
+		return count;
+	}
+
+	public BigDecimal getTotalAmount() {
+		BigDecimal amount = new BigDecimal("0");
+		if (this.items != null && this.items.size() > 0) {
+			for (CartItem item : this.items) {
+				if (item.getCheck()) {
+					BigDecimal totalPrice = item.getTotalPrice();
+					amount = amount.add(totalPrice);
+				}
+			}
+		}
+		return amount.subtract(this.getReduce());
+	}
+
+	public BigDecimal getReduce() {
+		return reduce;
+	}
+
+	public void setReduce(BigDecimal reduce) {
+		this.reduce = reduce;
+	}
+}

kkmall-cart/src/main/java/name/lkk/kkmall/cart/vo/CartItem.java

@@ -0,0 +1,102 @@
+package name.lkk.kkmall.cart.vo;
+
+import java.math.BigDecimal;
+import java.util.List;
+
+/**
+ * 购物车商品项，！本VO的GET，SET方法非默认实现。
+ */
+public class CartItem {
+
+    private Long skuId;
+
+    /**
+     * 是否被选中
+     */
+    private Boolean check = true;
+
+    private String title;
+
+    private String image;
+
+    private List<String> skuAttr;
+
+    /**
+     * 价格
+     */
+    private BigDecimal price;
+
+    /**
+     * 数量
+     */
+    private Integer count;
+
+    private BigDecimal totalPrice;
+
+    public Long getSkuId() {
+        return skuId;
+    }
+
+    public void setSkuId(Long skuId) {
+        this.skuId = skuId;
+    }
+
+    public Boolean getCheck() {
+        return check;
+    }
+
+    public void setCheck(Boolean check) {
+        this.check = check;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getImage() {
+        return image;
+    }
+
+    public void setImage(String image) {
+        this.image = image;
+    }
+
+    public List<String> getSkuAttr() {
+        return skuAttr;
+    }
+
+    public void setSkuAttr(List<String> skuAttr) {
+        this.skuAttr = skuAttr;
+    }
+
+    public BigDecimal getPrice() {
+        return price;
+    }
+
+    public void setPrice(BigDecimal price) {
+        this.price = price;
+    }
+
+    public Integer getCount() {
+        return count;
+    }
+
+    public void setCount(Integer count) {
+        this.count = count;
+    }
+
+    /**
+     * 手动计算总价
+     */
+    public BigDecimal getTotalPrice() {
+        return this.price.multiply(new BigDecimal("" + this.count));
+    }
+
+    public void setTotalPrice(BigDecimal totalPrice) {
+        this.totalPrice = totalPrice;
+    }
+}

kkmall-common/src/main/java/name/lkk/common/constant/CartConstant.java

@@ -1,13 +1,17 @@
 package name.lkk.common.constant;
 
 /**
- * <p>Title: CartConstant</p>
- * Description：
- * date：2020/6/27 22:37
+ * 购物车常量
+ *
+ * @author kirklin
  */
 public class CartConstant {
-
-	public static final String TEMP_USER_COOKIE_NAME = "user-key";
-
-	public static final int TEMP_USER_COOKIE_TIME_OUT = 60 * 60 * 24 * 30;
+    /**
+     * 购物车临时用户COOKIE
+     */
+    public static final String TEMP_USER_COOKIE_NAME = "user-key";
+    /**
+     * 购物车临时用户COOKIE过期时间
+     */
+    public static final int TEMP_USER_COOKIE_TIME_OUT = 60 * 60 * 24 * 30;
 }

kkmall-common/src/main/java/name/lkk/common/constant/DomainConstant.java

@@ -0,0 +1,14 @@
+package name.lkk.common.constant;
+
+/**
+ * @author: kirklin
+ * @date: 2021/7/10 3:29 下午
+ * @description: 域名常量
+ */
+public class DomainConstant {
+
+    public static final String MALL_DOMAIN = "kkmall.com";
+    public static final String MALL_HTTP_DOMAIN = "http://kkmall.com";
+    public static final String MALL_HTTPS_DOMAIN = "https://kkmall.com";
+
+}