淘淘商城_day09_课堂笔记
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今日大纲
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实现购物车
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基于Mysql实现读写分离
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购物车
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需求描述
-
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用户可以在登录状态下将商品添加到购物车
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用户可以在未登录状态下将商品添加到购物车
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用户可以使用购物车一起结算下单
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用户可以查询自己的购物车
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用户可以在购物车中可以修改购买商品的数量。
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用户可以在购物车中删除商品。
开发模式:敏捷开发
2个核心:
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用户故事
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周期迭代
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业务流程
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搭建购物车系统(taotao-cart)
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创建工程
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-
导入依赖
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.taotao.parent</groupId>
<artifactId>taotao-parent</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<groupId>com.taotao.cart</groupId>
<artifactId>taotao-cart</artifactId>
<version>1.0.0-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
<dependency>
<groupId>com.taotao.common</groupId>
<artifactId>taotao-common</artifactId>
<version>1.0.0-SNAPSHOT</version>
</dependency>
<!-- 单元测试 -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
</dependency>
<!-- Mybatis -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
</dependency>
<!-- 分页助手 -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
</dependency>
<dependency>
<groupId>com.github.jsqlparser</groupId>
<artifactId>jsqlparser</artifactId>
</dependency>
<!-- 通用Mapper -->
<dependency>
<groupId>com.github.abel533</groupId>
<artifactId>mapper</artifactId>
</dependency>
<!-- MySql -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</dependency>
<!-- Jackson Json处理工具包 -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
<!-- 连接池 -->
<dependency>
<groupId>com.jolbox</groupId>
<artifactId>bonecp-spring</artifactId>
<version>0.8.0.RELEASE</version>
</dependency>
<!-- httpclient -->
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
</dependency>
<!-- JSP相关 -->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jsp-api</artifactId>
<scope>provided</scope>
</dependency>
<!-- Apache工具组件 -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-io</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<!-- 配置Tomcat插件 -->
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<configuration>
<port>8086</port>
<path>/</path>
</configuration>
</plugin>
</plugins>
</build>
</project>
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Web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<display-name>taotao-cart</display-name>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/applicationContext*.xml</param-value>
</context-param>
<!--Spring的ApplicationContext 载入 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- 编码过滤器,以UTF8编码 -->
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 配置SpringMVC框架入口 -->
<servlet>
<servlet-name>taotao-cart</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/taotao-cart-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>taotao-cart</servlet-name>
<url-pattern>*.html</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
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其他配置文件
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配置nginx和hosts
Hosts:
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导入页面
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表结构
使用联合索引,一定要注意索引字段的顺序。
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加入商品到购物车的地址
http://cart.taotao.com/cart/{itemId}.html
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通过拦截器判断用户是否登录
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编写拦截器
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配置拦截器
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商品加入购物车
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Controller
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Service
加入商品到购物车:
public void addItemToCart(Long itemId) {
// 判断该商品在购物车中是否存在
User user = UserThreadLocal.get();
Cart record = new Cart();
record.setItemId(itemId);
record.setUserId(user.getId());
Cart cart = this.cartMapper.selectOne(record);
if (null == cart) {
// 购物车中不存在该商品
cart = new Cart();
cart.setItemId(itemId);
cart.setUserId(user.getId());
cart.setNum(1); // TODO先默认为1
cart.setCreated(new Date());
cart.setUpdated(cart.getCreated());
Item item = this.itemService.queryItemById(itemId);
cart.setItemImage(item.getImages()[0]);
cart.setItemPrice(item.getPrice());
cart.setItemTitle(item.getTitle());
// 将Cart保存到数据库
this.cartMapper.insert(cart);
} else {
// 该商品已经存在购物车中
cart.setNum(cart.getNum() + 1); // TODO先默认为1
cart.setUpdated(new Date());
this.cartMapper.updateByPrimaryKey(cart);
}
}
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查询购物车列表
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Controller
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Service
按照加入购物车时间倒序排序。
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测试
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计算总价
计算总价:
显示总价:
效果:
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修改购买数量
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JS
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限制用户输入
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解释:http://www.cnblogs.com/PeunZhang/archive/2012/08/16/2642084.html
使用:
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后台实现
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Controller
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Service
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格式化价格
格式化压缩的js:
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删除购物车中商品
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Controller
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Service
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分页插件
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未登录状态下的购物车
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以什么样数据格式保存购物车数据到cookie?
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可以使用json数据格式。
[
{
itemId:1001
itemTitle:"小米手机手机中的战斗机,欧耶"
……
}
]
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Service实现
package com.taotao.cart.service;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.taotao.cart.bean.Item;
import com.taotao.cart.pojo.Cart;
import com.taotao.common.utils.CookieUtils;
@Service
public class CartCookieService {
private static final String COOKIE_NAME = "TT_CART";
private static final Integer COOKIE_TIME = 60 * 60 * 24 * 30 * 12;
private static final ObjectMapper MAPPER = new ObjectMapper();
@Autowired
private ItemService itemService;
public void addItemToCart(Long itemId, HttpServletRequest request, HttpServletResponse response) {
// 判断该商品在购物车中是否存在,如果存在数量相加,如果不存在,直接添加
List<Cart> carts = this.queryCartList(request);
// 判断该商品是否存在
Cart cart = null;
for (Cart c : carts) {
if (c.getItemId().longValue() == itemId.longValue()) {
cart = c;
break;
}
}
if (null == cart) {
// 不存在
cart = new Cart();
cart.setItemId(itemId);
cart.setCreated(new Date());
cart.setUpdated(cart.getCreated());
cart.setNum(1); // TODO未完成
Item item = this.itemService.queryItemById(itemId);
String[] images = StringUtils.split(item.getImage(), ',');
if (null != images && images.length > 0) {
cart.setItemImage(images[0]);
}
cart.setItemPrice(item.getPrice());
cart.setItemTitle(item.getTitle());
carts.add(cart);
} else {
// 存在
cart.setNum(cart.getNum() + 1); // TODO未完成
cart.setUpdated(new Date());
}
try {
// 将购物车数据写入到cookie中
CookieUtils.setCookie(request, response, COOKIE_NAME, MAPPER.writeValueAsString(carts),
COOKIE_TIME, true);
} catch (Exception e) {
e.printStackTrace();
}
}
public List<Cart> queryCartList(HttpServletRequest request) {
String jsonData = CookieUtils.getCookieValue(request, COOKIE_NAME, true);
List<Cart> carts = null;
if (StringUtils.isNotEmpty(jsonData)) {
// 反序列化为List集合对象
try {
carts = MAPPER.readValue(jsonData,
MAPPER.getTypeFactory().constructCollectionType(List.class, Cart.class));
} catch (Exception e) {
e.printStackTrace();
carts = new ArrayList<Cart>();
}
} else {
carts = new ArrayList<Cart>();
}
// 按照创建时间倒序排序
Collections.sort(carts, new Comparator<Cart>() {
@Override
public int compare(Cart o1, Cart o2) {
return (int) (o2.getCreated().getTime() - o1.getCreated().getTime());
}
});
return carts;
}
public void updateNum(Long itemId, Integer num, HttpServletRequest request, HttpServletResponse response) {
List<Cart> carts = this.queryCartList(request);
// 判断该商品是否存在
Cart cart = null;
for (Cart c : carts) {
if (c.getItemId().longValue() == itemId.longValue()) {
cart = c;
break;
}
}
if (cart == null) {
return;
}
cart.setNum(num);
cart.setUpdated(new Date());
try {
// 将购物车数据写入到cookie中
CookieUtils.setCookie(request, response, COOKIE_NAME, MAPPER.writeValueAsString(carts),
COOKIE_TIME, true);
} catch (Exception e) {
e.printStackTrace();
}
}
public void delete(Long itemId, HttpServletRequest request, HttpServletResponse response) {
List<Cart> carts = this.queryCartList(request);
// 判断该商品是否存在
for (Cart c : carts) {
if (c.getItemId().longValue() == itemId.longValue()) {
carts.remove(c);
break;
}
}
try {
// 将购物车数据写入到cookie中
CookieUtils.setCookie(request, response, COOKIE_NAME, MAPPER.writeValueAsString(carts),
COOKIE_TIME, true);
} catch (Exception e) {
e.printStackTrace();
}
}
}
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基于购物车实现下单功能
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分析
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购物车页面中跳转到前端的订单确认页
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前端系统的中实现
通过购物车系统提供的接口查询数据:
购物车系统中开发接口,根据用户id查询购物车列表:
订单确认页:
关键点:form表单
下单成功:
数据:
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购物车的优化改进
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未登录状态的数据存储的优化
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现在有什么问题?
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-
现在,将未登录状态下的购物车数据保存在cookie中,存在问题,因为,浏览器对cookie的大小是有限制的,意味着,我们不可能一直向cookie中存数据,限制了用户的使用。
-
如何改造、优化?
未登录状态下的购物车数据已经不能保存在客户端(cookie),只能保存在服务端:
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数据库
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数据库的读写压力比较大
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容易产生垃圾数据,需要定期去清理它
-
-
文件中
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还不如保存在数据库
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IO(读写)问题
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Redis
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可行的
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内存存储,读写速度快
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有生存时间,可以自动清理垃圾数据
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但是,要考虑到一个问题,容量问题?
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Redis的集群
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一种:分片式集群
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一种:Redis3.0的新功能,集群
-
-
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其他
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。。。。
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使用Redis的什么数据结构?
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方案一:
将原有的cookie中字符串数据,按照字符串的数据结构保存到Redis中。
该方案存在的问题:
对于每一个Cart对象的操作,都需要经历,字符串 è List<Cart> è 字符串,假如,购物车中1000个商品,问题就更为突出了。
方案二:
使用Redis的hash结构。
结构: key field value
实现:
-
key : 为每一个人都生成一个唯一的key,可以使用md5
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field :商品id
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value: Cart对象序列化之后的json字符串
显然,我们采用方案二。
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扩展RedisService
/**
* 保存数据到hash结构中(指定生存时间)
*
* @param key
* @param field
* @param value
* @param seconds
* @return
*/
public Long hset(final String key, final String field, final String value, final Integer seconds) {
return this.execute(new Function<Long, ShardedJedis>() {
@Override
public Long callback(ShardedJedis e) {
Long _long = e.hset(key, field, value);
e.expire(key, seconds);
return _long;
}
});
}
/**
* 保存数据到hash结构中
*
* @param key
* @param field
* @param value
* @return
*/
public Long hset(final String key, final String field, final String value) {
return this.execute(new Function<Long, ShardedJedis>() {
@Override
public Long callback(ShardedJedis e) {
return e.hset(key, field, value);
}
});
}
/**
* 获取hash中的数据
*
* @param key
* @param field
* @return
*/
public String hget(final String key, final String field) {
return this.execute(new Function<String, ShardedJedis>() {
@Override
public String callback(ShardedJedis e) {
return e.hget(key, field);
}
});
}
/**
* 获取hash结构中所有的数据
*
* @param key
* @return
*/
public Map<String, String> hgetAll(final String key) {
return this.execute(new Function<Map<String, String>, ShardedJedis>() {
@Override
public Map<String, String> callback(ShardedJedis e) {
return e.hgetAll(key);
}
});
}
/**
* 删除hash中的数据
*
* @param key
* @param field
* @return
*/
public Long hdel(final String key, final String field) {
return this.execute(new Function<Long, ShardedJedis>() {
@Override
public Long callback(ShardedJedis e) {
return e.hdel(key, field);
}
});
}
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实现RedisService
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.lang3.RandomUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.taotao.cart.bean.Item;
import com.taotao.cart.pojo.Cart;
import com.taotao.common.service.RedisService;
import com.taotao.common.utils.CookieUtils;
@Service
public class CartRedisService {
private static final String COOKIE_NAME = "TT_CART";
private static final Integer TIME = 60 * 60 * 24 * 30;
@Autowired
private ItemService itemService;
@Autowired
private RedisService redisService;
private static final ObjectMapper MAPPER = new ObjectMapper();
public void addItemToCart(Long itemId, HttpServletRequest request, HttpServletResponse response) {
String key = CookieUtils.getCookieValue(request, COOKIE_NAME);
if (StringUtils.isEmpty(key)) {
// 生存一个key
key = DigestUtils.md5Hex("" + System.currentTimeMillis() + itemId
+ RandomUtils.nextInt(1000, 9999));
// 写入到cookie中
CookieUtils.setCookie(request, response, COOKIE_NAME, key, TIME);
}
// 判断该商品在购物车中是否存在,如果存在数量相加,如果不存在,直接添加
String redisKey = "CART_" + key;
String cartStr = this.redisService.hget(redisKey, String.valueOf(itemId));
Cart cart = null;
if (StringUtils.isNotEmpty(cartStr)) {
try {
cart = MAPPER.readValue(cartStr, Cart.class);
} catch (Exception e) {
e.printStackTrace();
}
}
if (null == cart) {
// 不存在
cart = new Cart();
cart.setItemId(itemId);
cart.setCreated(new Date());
cart.setUpdated(cart.getCreated());
cart.setNum(1); // TODO未完成
Item item = this.itemService.queryItemById(itemId);
String[] images = StringUtils.split(item.getImage(), ',');
if (null != images && images.length > 0) {
cart.setItemImage(images[0]);
}
cart.setItemPrice(item.getPrice());
cart.setItemTitle(item.getTitle());
} else {
// 存在
cart.setNum(cart.getNum() + 1); // TODO未完成
cart.setUpdated(new Date());
}
try {
this.redisService.hset(redisKey, String.valueOf(itemId), MAPPER.writeValueAsString(cart), TIME);
} catch (Exception e) {
e.printStackTrace();
}
}
public List<Cart> queryCartList(HttpServletRequest request, HttpServletResponse response) {
String key = CookieUtils.getCookieValue(request, COOKIE_NAME);
String redisKey = "CART_" + key;
Map<String, String> map = this.redisService.hgetAll(redisKey);
if (null == map || map.isEmpty()) {
return new ArrayList<Cart>();
}
List<Cart> carts = new ArrayList<Cart>();
for (String k : map.keySet()) {
String json = map.get(k);
Cart cart;
try {
cart = MAPPER.readValue(json, Cart.class);
carts.add(cart);
} catch (Exception e) {
// 如果有异常,就忽略该数据
e.printStackTrace();
}
}
// 按照创建时间倒序排序
Collections.sort(carts, new Comparator<Cart>() {
@Override
public int compare(Cart o1, Cart o2) {
return (int) (o2.getCreated().getTime() - o1.getCreated().getTime());
}
});
// 刷新数据的生存时间
this.redisService.expire(redisKey, TIME);
CookieUtils.setCookie(request, response, COOKIE_NAME, key, TIME);
return carts;
}
public void updateNum(Long itemId, Integer num, HttpServletRequest request) {
String key = CookieUtils.getCookieValue(request, COOKIE_NAME);
String redisKey = "CART_" + key;
String cartStr = this.redisService.hget(redisKey, String.valueOf(itemId));
if (StringUtils.isEmpty(cartStr)) {
return;
}
Cart cart = null;
if (StringUtils.isNotEmpty(cartStr)) {
try {
cart = MAPPER.readValue(cartStr, Cart.class);
} catch (Exception e) {
e.printStackTrace();
}
}
if (null != cart) {
cart.setNum(num);
cart.setUpdated(new Date());
try {
this.redisService.hset(redisKey, String.valueOf(itemId), MAPPER.writeValueAsString(cart),
TIME);
} catch (Exception e) {
e.printStackTrace();
}
}
}
public void delete(Long itemId, HttpServletRequest request) {
String key = CookieUtils.getCookieValue(request, COOKIE_NAME);
String redisKey = "CART_" + key;
this.redisService.hdel(redisKey, String.valueOf(itemId));
}
}
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登录成功后,合并未登录和登录状态下的数据
-
合并的动作在哪个系统中完成?
-
-
实现分析
-
用户在登录成功时,需要发送消息到交换机
-
发送消息时,携带cookie中的购物车key的值
-
-
购物车系统创建队列,绑定到该交换机
-
购物车系统接收到消息之后,读取未登录状态下的购物车数据,和数据库中的数据进行合并,清空未登录状态下的数据
-
Sso系统中发送登录成功的消息
-
-
导入依赖
-
RabbitMQ的配置文件
-
在UserService中,登录成功后发送消息
-
购物车系统中接收消息
-
-
导入依赖
-
配置文件
-
处理消息
@Service
public class CartRedisService {
private static final String COOKIE_NAME = "TT_CART";
private static final Integer TIME = 60 * 60 * 24 * 30;
@Autowired
private ItemService itemService;
@Autowired
private RedisService redisService;
private static final ObjectMapper MAPPER = new ObjectMapper();
public void addItemToCart(Long itemId, HttpServletRequest request, HttpServletResponse response) {
String key = CookieUtils.getCookieValue(request, COOKIE_NAME);
if (StringUtils.isEmpty(key)) {
// 生存一个key
key = DigestUtils.md5Hex("" + System.currentTimeMillis() + itemId
+ RandomUtils.nextInt(1000, 9999));
// 写入到cookie中
CookieUtils.setCookie(request, response, COOKIE_NAME, key, TIME);
}
// 判断该商品在购物车中是否存在,如果存在数量相加,如果不存在,直接添加
String redisKey = getRedisKey(key);
String cartStr = this.redisService.hget(redisKey, String.valueOf(itemId));
Cart cart = null;
if (StringUtils.isNotEmpty(cartStr)) {
try {
cart = MAPPER.readValue(cartStr, Cart.class);
} catch (Exception e) {
e.printStackTrace();
}
}
if (null == cart) {
// 不存在
cart = new Cart();
cart.setItemId(itemId);
cart.setCreated(new Date());
cart.setUpdated(cart.getCreated());
cart.setNum(1); // TODO未完成
Item item = this.itemService.queryItemById(itemId);
String[] images = StringUtils.split(item.getImage(), ',');
if (null != images && images.length > 0) {
cart.setItemImage(images[0]);
}
cart.setItemPrice(item.getPrice());
cart.setItemTitle(item.getTitle());
} else {
// 存在
cart.setNum(cart.getNum() + 1); // TODO未完成
cart.setUpdated(new Date());
}
try {
this.redisService.hset(redisKey, String.valueOf(itemId), MAPPER.writeValueAsString(cart), TIME);
} catch (Exception e) {
e.printStackTrace();
}
}
public List<Cart> queryCartList(String cookieCart) {
String redisKey = getRedisKey(cookieCart);
Map<String, String> map = this.redisService.hgetAll(redisKey);
if (null == map || map.isEmpty()) {
return new ArrayList<Cart>();
}
List<Cart> carts = new ArrayList<Cart>();
for (String k : map.keySet()) {
String json = map.get(k);
Cart cart;
try {
cart = MAPPER.readValue(json, Cart.class);
carts.add(cart);
} catch (Exception e) {
// 如果有异常,就忽略该数据
e.printStackTrace();
}
}
// 刷新数据的生存时间
this.redisService.expire(redisKey, TIME);
return carts;
}
public List<Cart> queryCartList(HttpServletRequest request, HttpServletResponse response) {
String key = CookieUtils.getCookieValue(request, COOKIE_NAME);
List<Cart> carts = this.queryCartList(key);
// 按照创建时间倒序排序
Collections.sort(carts, new Comparator<Cart>() {
@Override
public int compare(Cart o1, Cart o2) {
return (int) (o2.getCreated().getTime() - o1.getCreated().getTime());
}
});
CookieUtils.setCookie(request, response, COOKIE_NAME, key, TIME);
return carts;
}
public void updateNum(Long itemId, Integer num, HttpServletRequest request) {
String key = CookieUtils.getCookieValue(request, COOKIE_NAME);
String redisKey = getRedisKey(key);
String cartStr = this.redisService.hget(redisKey, String.valueOf(itemId));
if (StringUtils.isEmpty(cartStr)) {
return;
}
Cart cart = null;
if (StringUtils.isNotEmpty(cartStr)) {
try {
cart = MAPPER.readValue(cartStr, Cart.class);
} catch (Exception e) {
e.printStackTrace();
}
}
if (null != cart) {
cart.setNum(num);
cart.setUpdated(new Date());
try {
this.redisService.hset(redisKey, String.valueOf(itemId), MAPPER.writeValueAsString(cart),
TIME);
} catch (Exception e) {
e.printStackTrace();
}
}
}
private String getRedisKey(String cookieKey){
return "CART_" + cookieKey;
}
public void delete(Long itemId, HttpServletRequest request) {
String key = CookieUtils.getCookieValue(request, COOKIE_NAME);
String redisKey = getRedisKey(key);
this.redisService.hdel(redisKey, String.valueOf(itemId));
}
public void clear(String cookieCart) {
String redisKey = getRedisKey(cookieCart);
this.redisService.del(redisKey);
}
}
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下单成功后,删除成功下单的商品
-
分析
-
订单系统中,下单成功后发送消息。
-
订单系统发消息
-
购物车系统监听消息
-
处理消息
-
实现
-
-
导入Spring-rabbit依赖
-
编写配置文件
-
发送消息
-
处理消息(taotao-cart)
-
读写分离
-
《使用Spring实现读写分离(MySQL实现主从复制).docx》
-
主从设置失败
如何定位问题?
查看3381的日志:
问题:
如何设置Mysql的UUID?
问题解决: