淘淘商城_day09_课堂笔记

  1. 今日大纲

  1. 实现购物车
  2. 基于Mysql实现读写分离

 

  1. 购物车

    1. 需求描述

  1. 用户可以在登录状态下将商品添加到购物车
  2. 用户可以在未登录状态下将商品添加到购物车
  3. 用户可以使用购物车一起结算下单
  4. 用户可以查询自己的购物车
  5. 用户可以在购物车中可以修改购买商品的数量。
  6. 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:

  1. 用户故事
  2. 周期迭代

 

  1. 业务流程

 

  1. 搭建购物车系统(taotao-cart)

    1. 创建工程

  1. 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>

  1. 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>

 

    <!--SpringApplicationContext 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>

  1. 其他配置文件

  1. 配置nginx和hosts

 

 

Hosts:

  1. 导入页面

  1. 表结构

 

使用联合索引,一定要注意索引字段的顺序

 

  1. 加入商品到购物车的地址

http://cart.taotao.com/cart/{itemId}.html

 

  1. 通过拦截器判断用户是否登录

    1. 编写拦截器

  1. 配置拦截器

  1. 商品加入购物车

    1. Controller

  1. 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());

 

// 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);

}

}

 

 

  1. 查询购物车列表

    1. Controller

  1. Service

按照加入购物车时间倒序排序。

  1. 测试

 

  1. 计算总价

计算总价:

 

显示总价:

 

效果:

  1. 修改购买数量

    1. JS

      1. 限制用户输入

 

解释:http://www.cnblogs.com/PeunZhang/archive/2012/08/16/2642084.html

 

使用:

 

  1. 后台实现

    1. Controller

  1. Service

  1. 格式化价格

 

 

格式化压缩的js:

 

  1. 删除购物车中商品

    1. Controller

  1. Service

  1. 分页插件

 

 

  1. 未登录状态下的购物车

    1. 以什么样数据格式保存购物车数据到cookie?

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"

……

}

]

 

  1. 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

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

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

CookieUtils.setCookie(request, response, COOKIE_NAME, MAPPER.writeValueAsString(carts),

COOKIE_TIME, true);

} catch (Exception e) {

e.printStackTrace();

}

}

}

 

 

  1. 基于购物车实现下单功能

    1. 分析

  1. 购物车页面中跳转到前端的订单确认页

  1. 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:

  1. 购物车的优化改进

    1. 未登录状态的数据存储的优化

      1. 现在有什么问题?

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。

 

 

  1. 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:

 

  1. 数据库
    1. 数据库的读写压力比较大
    2. 容易产生垃圾数据,需要定期去清理它
  2. 文件中
    1. 还不如保存在数据库
    2. IO(读写)问题
  3. Redis
    1. 可行的
    2. 内存存储,读写速度快
    3. 有生存时间,可以自动清理垃圾数据
    4. 但是,要考虑到一个问题,容量问题?
      1. Redis的集群
      2. 一种:分片式集群
      3. 一种:Redis3.0的新功能,集群
  4. 其他
    1. 。。。。
    1. 使用Redis的什么数据结构?

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:

  1. key : 为每一个人都生成一个唯一的key,可以使用md5
  2. field :商品id
  3. value: Cart对象序列化之后的json字符串

 

显然,我们采用方案二。

  1. 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);

}

});

}

  1. 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

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));

}

 

}

 

  1. 登录成功后,合并未登录和登录状态下的数据

    1. 合并的动作在哪个系统中完成?

  1. 实现分析

  1. 用户在登录成功时,需要发送消息到交换机
    1. 发送消息时,携带cookie中的购物车key的值
  2. 购物车系统创建队列,绑定到该交换机
  3. 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
    1. Sso系统中发送登录成功的消息

  4. 导入依赖
  5. RabbitMQ的配置文件
  6. 在UserService中,登录成功后发送消息
    1. 购物车系统中接收消息

  7. 导入依赖
  8. 配置文件
  9. 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

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);

}

 

}

  1. 下单成功后,删除成功下单的商品

    1. 分析

订单系统中,下单成功后发送消息。

 

  1. 订单系统发消息
  2. 购物车系统监听消息
  3. 处理消息
    1. 实现

  4. 导入Spring-rabbit依赖
  5. 编写配置文件
  6. 发送消息
  7. 处理消息(taotao-cart)

    1. 读写分离

《使用Spring实现读写分离(MySQL实现主从复制).docx》

  1. 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:

 

posted @ 2017-01-11 10:55  beyondcj  阅读(506)  评论(0编辑  收藏  举报