三天学会阿里分布式事务框架Seata-SpringCloud Alibaba分布式基础案例搭建

java1234_小锋2024-03-01 16:05

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实战阿里分布式事务框架Seata视频教程（无废话，通俗易懂版）_哔哩哔哩_bilibili实战阿里分布式事务框架Seata视频教程（无废话，通俗易懂版）共计10条视频，包括：1 阿里分布式事务框架Seata简介、2 分布式事务简介、3 SpringCloud Alibaba分布式基础案例搭建等，UP主更多精彩视频，请关注UP账号。https://www.bilibili.com/video/BV1Uf4y1579F/我们模拟一个简单下单业务，客户端调用rest对外服务，rest服务再调用订单服务实现创建订单和账户服务实现账户扣钱操作，最终来完整下单业务；

2.1 案例架构设计

所有服务都注册到nacos中，方便feign远程调用；订单服务，账户服务各自有独立数据库；架构设计如下图：

整体项目结构如下图：

seatatest是父项目，主要是做一些依赖管理，依赖版本管理，管理所有子module项目；

seata-common子项目，主要是引入其他子项目需要的公共依赖，以及公共实体，工具类，配置类的统一封装；

seata-order子项目，主要提供订单服务，生成订单；

seata-account子项目，主要提供账户服务，根据订单扣钱操作；

seata-web子项目，主要处理客户端下单请求，feign远程调用order，和account服务接口，最终完成下单处理；

2.2 数据库设计

我们新建两个数据库，分别是db_order（订单数据库），db_account（账户数据库），

db_order数据库里面新建表t_order订单表：

sql 复制代码 
CREATE TABLE `t_order` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `orderNo` varchar(100) DEFAULT NULL,
  `userId` int(11) DEFAULT NULL,
  `count` int(11) DEFAULT NULL,
  `amount` int(11) DEFAULT NULL,
  `remark` varchar(100) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=21 DEFAULT CHARSET=utf8

db_account数据库里面新建表t_account用户账户表：

sql 复制代码 
CREATE TABLE `t_account` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `userId` int(11) DEFAULT NULL,
  `balance` int(11) DEFAULT NULL,
  `remark` varchar(100) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8

插入数据：

sql 复制代码 
insert into `t_account` (`id`, `userId`, `balance`, `remark`) values('1','1','2000','jack的账户');
insert into `t_account` (`id`, `userId`, `balance`, `remark`) values('2','2','1000','marry的账户');

2.3 seatatest父项目搭建

seatatest是父项目，主要是做一些依赖管理，依赖版本管理，管理所有子module项目；

注意，它的packaging类型是pom

pom.xml：

XML 复制代码 
<?xml version="1.0" encoding="UTF-8"?>
<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>

    <groupId>com.java1234</groupId>
    <artifactId>seatatest</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>seata-common</module>
        <module>seata-order</module>
        <module>seata-account</module>
        <module>seata-web</module>
    </modules>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <druid.version>1.1.10</druid.version>
        <spring-cloud.version>Hoxton.SR8</spring-cloud.version>
        <springboot.version>2.3.2.RELEASE</springboot.version>
        <springcloudalibaba.version>2.2.4.RELEASE</springcloudalibaba.version>
        <fastjson.version>1.2.35</fastjson.version>
        <commons-lang3.version>3.6</commons-lang3.version>
        <seata-common.version>1.0-SNAPSHOT</seata-common.version>
        <mybatis.version>2.1.0</mybatis.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${springboot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${springcloudalibaba.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!-- 连接池 -->
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>${druid.version}</version>
            </dependency>

            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>${fastjson.version}</version>
            </dependency>

            <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-lang3</artifactId>
                <version>${commons-lang3.version}</version>
            </dependency>

            <dependency>
                <groupId>com.java1234</groupId>
                <artifactId>seata-common</artifactId>
                <version>${seata-common.version}</version>
            </dependency>

            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>${mybatis.version}</version>
            </dependency>

        </dependencies>
    </dependencyManagement>


    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

2.4 seata-common子项目搭建

seata-common子项目，主要是引入其他子项目需要的公共依赖，以及公共实体，工具类，配置类的统一封装；

项目结构：

XML 复制代码 
<?xml version="1.0" encoding="UTF-8"?>
<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">
    <parent>
        <artifactId>seatatest</artifactId>
        <groupId>com.java1234</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>seata-common</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>


        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
        </dependency>

        <!-- spring boot redis 缓存引入 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <!-- lettuce pool 缓存连接池 -->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-pool2</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
        </dependency>

        <dependency>
            <groupId>commons-codec</groupId>
            <artifactId>commons-codec</artifactId>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
        </dependency>




    </dependencies>


</project>

订单实体Order：

java 复制代码 
package com.java1234.entity;

/**订单表实体
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2021-07-13 10:26
 */
public class Order {

    private Integer id; // 编号

    private String orderNo; // 订单号

    private Integer userId; // 用户编号

    private Integer count; // 购买数量

    private Integer amount; // 购买金额

    private String remark; // 备注

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getOrderNo() {
        return orderNo;
    }

    public void setOrderNo(String orderNo) {
        this.orderNo = orderNo;
    }

    public Integer getUserId() {
        return userId;
    }

    public void setUserId(Integer userId) {
        this.userId = userId;
    }

    public Integer getCount() {
        return count;
    }

    public void setCount(Integer count) {
        this.count = count;
    }

    public Integer getAmount() {
        return amount;
    }

    public void setAmount(Integer amount) {
        this.amount = amount;
    }

    public String getRemark() {
        return remark;
    }

    public void setRemark(String remark) {
        this.remark = remark;
    }
}

账户实体Account：

java 复制代码 
package com.java1234.entity;

/**
 * 用户账户表
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2021-07-13 10:36
 */
public class Account {

    private Integer id; // 编号

    private Integer userId; // 用户编号

    private Integer balance; // 账户余额

    private String remark; // 备注

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public Integer getUserId() {
        return userId;
    }

    public void setUserId(Integer userId) {
        this.userId = userId;
    }

    public Integer getBalance() {
        return balance;
    }

    public void setBalance(Integer balance) {
        this.balance = balance;
    }

    public String getRemark() {
        return remark;
    }

    public void setRemark(String remark) {
        this.remark = remark;
    }
}

2.5 seata-order子项目搭建

seata-order子项目，主要提供订单服务，生成订单；

项目结构：

pom.xml：

XML 复制代码 
<?xml version="1.0" encoding="UTF-8"?>
<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">
    <parent>
        <artifactId>seatatest</artifactId>
        <groupId>com.java1234</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>seata-order</artifactId>
    
    <dependencies>
        <dependency>
            <groupId>com.java1234</groupId>
            <artifactId>seata-common</artifactId>
        </dependency>



    </dependencies>


</project>

application.yml：

XML 复制代码 
server:
  port: 8081
  servlet:
    context-path: /

spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/db_order?serverTimezone=Asia/Shanghai
    username: root
    password: 123456
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
  application:
    name: seata-order

mybatis:
  mapper-locations: classpath:mybatis/mapper/*.xml

启动类OrderApplication：

java 复制代码 
package com.java1234;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@MapperScan("com.java1234.mapper")
@EnableDiscoveryClient
public class OrderApplication {

    public static void main(String[] args) {
        SpringApplication.run(OrderApplication.class, args);
    }

}

OrderMapper.xml：

XML 复制代码 
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.java1234.mapper.OrderMapper">

    <select id="createOrder" parameterType="com.java1234.entity.Order" >
        insert into t_order values(null,#{orderNo},#{userId},#{count},#{amount},#{remark})
    </select>
</mapper>

OrderMapper接口：

java 复制代码 
package com.java1234.mapper;

import com.java1234.entity.Order;

/**
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2021-07-13 10:43
 */
public interface OrderMapper {

    /**
     * 创建订单
     * @param order
     */
    void createOrder(Order order);


}

OrderService接口：

java 复制代码 
package com.java1234.service;

import com.java1234.entity.Order;

/**
 * 订单service接口
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2021-07-14 11:00
 */
public interface OrderService {

    /**
     * 创建订单
     * @param order
     */
    void createOrder(Order order);

}

OrderServiceImpl实现类：

java 复制代码 
package com.java1234.service.impl;

import com.java1234.entity.Order;
import com.java1234.mapper.OrderMapper;
import com.java1234.service.OrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2021-07-14 11:02
 */
@Service("orderService")
public class OrderServiceImpl implements OrderService {

    @Autowired
    private OrderMapper orderMapper;

    @Override
    public void createOrder(Order order) {
        orderMapper.createOrder(order);
    }
}

OrderController：

java 复制代码 
package com.java1234.controller;

import com.java1234.entity.Order;
import com.java1234.service.OrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.UUID;

/**
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2021-07-14 11:13
 */
@RestController
@RequestMapping("/seata")
public class OrderController {

    @Autowired
    private OrderService orderService;

    /**
     * 创建订单
     * @param order
     * @return
     */
    @PostMapping("/createOrder")
    public boolean createOrder(@RequestBody Order order){
        System.out.println("order:"+order);
        order.setOrderNo(UUID.randomUUID().toString());  // 生成订单ID
        orderService.createOrder(order);
        return true;
    }
}

2.6 seata-account子项目搭建

seata-account子项目，主要提供账户服务，根据订单扣钱操作；

项目结构：

pom.xml：

XML 复制代码 
<?xml version="1.0" encoding="UTF-8"?>
<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">
    <parent>
        <artifactId>seatatest</artifactId>
        <groupId>com.java1234</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>seata-account</artifactId>

    <dependencies>
        <dependency>
            <groupId>com.java1234</groupId>
            <artifactId>seata-common</artifactId>
        </dependency>
    </dependencies>


</project>

application.yml：

XML 复制代码 
server:
  port: 8082
  servlet:
    context-path: /

spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/db_account?serverTimezone=Asia/Shanghai
    username: root
    password: 123456
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
  application:
    name: seata-account

mybatis:
  mapper-locations: classpath:mybatis/mapper/*.xml

AccountApplication启动类：

java 复制代码 
package com.java1234;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@MapperScan("com.java1234.mapper")
@EnableDiscoveryClient
public class AccountApplication {

    public static void main(String[] args) {
        SpringApplication.run(AccountApplication.class, args);
    }

}

AccountMapper.xml：

XML 复制代码 
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.java1234.mapper.AccountMapper">

    <select id="decrease" parameterType="Map" >
        UPDATE t_account SET balance=balance-#{amount} WHERE userId=#{userId}
    </select>
</mapper>

AccountMapper接口：

java 复制代码 
package com.java1234.mapper;


import java.util.Map;

/**
 * 账户Mapper接口
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2021-07-13 10:43
 */
public interface AccountMapper {

    /**
     * 账户扣钱
     */
    void decrease(Map map);


}

AccountService接口：

java 复制代码 
package com.java1234.service;

import java.util.Map;

/**
 * 账户service接口
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2021-07-15 12:58
 */
public interface AccountService {

    /**
     * 账户扣钱
     */
    void decrease(Map map);
}

`AccountServiceImpl`接口实现类：

java 复制代码 
package com.java1234.service.impl;

import com.java1234.mapper.AccountMapper;
import com.java1234.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.Map;

/**
 * 账户Service实现类
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2021-07-15 13:00
 */
@Service("accountService")
public class AccountServiceImpl implements AccountService {

    @Autowired
    private AccountMapper accountMapper;

    @Override
    public void decrease(Map map) {
        accountMapper.decrease(map);
    }
}

AccountController：

java 复制代码 
package com.java1234.controller;

import com.java1234.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.Map;

/**
 * 账户Controller
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2021-07-15 13:06
 */
@RestController
@RequestMapping("/account")
public class AccountController {

    @Autowired
    private AccountService accountService;

    /**
     * 给指定用户账户扣钱
     * @param amount
     * @param userId
     * @return
     */
    @PostMapping("/decrease")
    public boolean decrease(@RequestParam("amount")Integer amount, @RequestParam("userId")Integer userId){
        System.out.println("amount:"+amount+",userId:"+userId);

        Map<String,Object> map=new HashMap<>();
        map.put("amount",amount);
        map.put("userId",userId);

        accountService.decrease(map);
        return true;

    }

}

2.7 seata-web子项目搭建

seata-web子项目，主要处理客户端下单请求，feign远程调用order，和account服务接口，最终完成下单处理；

项目结构：

pom.xml：

XML 复制代码 
<?xml version="1.0" encoding="UTF-8"?>
<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">
    <parent>
        <artifactId>seatatest</artifactId>
        <groupId>com.java1234</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>seata-web</artifactId>

    <dependencies>

        <dependency>
            <groupId>com.java1234</groupId>
            <artifactId>seata-common</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

    </dependencies>


</project>

application.yml：

XML 复制代码 
server:
  port: 80
  servlet:
    context-path: /


spring:
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
  application:
    name: seata-web

WebApplication：

java 复制代码 
package com.java1234;


import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class})
@EnableFeignClients(basePackages = "com.java1234.feign")
@EnableDiscoveryClient
public class WebApplication {

    public static void main(String[] args) {
        SpringApplication.run(WebApplication.class, args);
    }

}

OrderFeignService：

java 复制代码 
package com.java1234.feign;

import com.java1234.entity.Order;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;

/**
 * 订单接口feign远程调用
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2021-07-16 10:55
 */
@FeignClient("seata-order")
public interface OrderFeignService {

    /**
     * 创建订单
     * @param order
     * @return
     */
    @PostMapping("/seata/createOrder")
    public boolean createOrder(@RequestBody Order order);

}

AccountFeignService：

java 复制代码 
package com.java1234.feign;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;

/**
 * 账号接口feign远程调用
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2021-07-16 10:55
 */
@FeignClient("seata-account")
public interface AccountFeignService {

    /**
     * 账号扣钱
     * @param amount
     * @param userId
     * @return
     */
    @PostMapping("/account/decrease")
    public boolean decrease(@RequestParam("amount")Integer amount, @RequestParam("userId")Integer userId);

}

WebController：

java 复制代码 
package com.java1234.controller;

import com.java1234.entity.Order;
import com.java1234.feign.AccountFeignService;
import com.java1234.feign.OrderFeignService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * web-rest接口
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2021-07-15 16:32
 */
@RestController
public class WebController {

    @Autowired
    private OrderFeignService orderFeignService;

    @Autowired
    private AccountFeignService  accountFeignService;

    /**
     * 下单 1，创建订单 2，账户扣钱
     * @param order
     * @return
     */
    @PostMapping("/shopping")
    public boolean shopping(Order order){
        orderFeignService.createOrder(order); // 创建订单
        accountFeignService.decrease(order.getAmount(),order.getUserId()); // 账户扣钱
        return true;
    }


}

2.8 postman测试

首先启动Nacos服务注册中心：

项目启动：

Nacos控制台：

服务注册成功！

测试接口：http://localhost/shopping

接口测试OK：

订单表生成订单：

账户表id=1的jack账户成功扣减180元；

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