SpringBoot+Nacos+Seata实现Dubbo分布式事务管理

1.简介

本文主要介绍SpringBoot2.1.5 + Dubbo 2.7.3 + Mybatis 3.4.2 + Nacos 1.1.3 +Seata 0.8.0整合来实现Dubbo分布式事务管理，使用Nacos 作为 Dubbo和Seata的注册中心和配置中心,使用 MySQL 数据库和 MyBatis来操作数据。

如果你还对SpringBoot、Dubbo、Nacos、Seata、Mybatis 不是很了解的话，这里我为大家整理个它们的官网网站，如下

• SpringBoot：https://spring.io/projects/spring-boot

• Dubbo：http://dubbo.apache.org/en-us/

• Nacos：https://nacos.io/zh-cn/docs/quick-start.html

• Seata：https://github.com/seata/seata/wiki/Home_Chinese

• MyBatis：http://www.mybatis.org/mybatis-3/zh/index.html

在这里我们就不一个一个介绍它们是怎么使用和原理，详细请学习官方文档，在这里我将开始对它们进行整合，完成一个简单的案例，来让大家了解Seata来实现Dubbo分布式事务管理的基本流程。

2.环境准备

2.1 下载nacos并安装启动

nacos下载：https://github.com/alibaba/nacos/releases/tag/1.1.3

Nacos 快速入门：https://nacos.io/en-us/docs/quick-start.html

sh startup.sh -m standalone

在浏览器打开Nacos web 控制台：http://192.168.10.200:8848/nacos/index.html

输入nacos的账号和密码 分别为nacos：nacos

这是时候naocs 就正常启动了。

2.2 下载seata0.8.0 并安装启动

2.2.1 在 Seata Release 下载最新版的 Seata Server 并解压得到如下目录：

.
├──bin
├──conf
├──file_store
└──lib

2.2.2 修改 conf/registry.conf 配置，

目前seata支持如下的file、nacos 、apollo、zk、consul的注册中心和配置中心。这里我们以nacos 为例。
将 type 改为 nacos

registry {
  # file nacos
  type = "nacos"

  nacos {
    serverAddr = "192.168.10.200:8848"
    namespace = "public"
    cluster = "default"
  }
  file {
    name = "file.conf"
  }
}

config {
  # file、nacos 、apollo、zk、consul
  type = "nacos"

  nacos {
    serverAddr = "192.168.10.200:8848"
    namespace = "public"
    cluster = "default"
  }

  file {
    name = "file.conf"
  }
}

• serverAddr = “192.168.10.200:8848” ：nacos 的地址
• namespace = “public” ：nacos的命名空间默认为public
• cluster = “default” ：集群设置未默认 default

注意： seata0.9.0之后，配置如下, 其中namespace = ""

registry {
  # file nacos
  type = "nacos"

  nacos {
    serverAddr = "192.168.10.200:8848"
    namespace = ""
    cluster = "default"
  }
  file {
    name = "file.conf"
  }
}

config {
  # file、nacos 、apollo、zk、consul
  type = "nacos"

  nacos {
    serverAddr = "192.168.10.200:8848"
    namespace = ""
  }

  file {
    name = "file.conf"
  }
}

2.2.3 修改 conf/nacos-config.txt配置

transport.type=TCP
transport.server=NIO
transport.heartbeat=true
transport.thread-factory.boss-thread-prefix=NettyBoss
transport.thread-factory.worker-thread-prefix=NettyServerNIOWorker
transport.thread-factory.server-executor-thread-prefix=NettyServerBizHandler
transport.thread-factory.share-boss-worker=false
transport.thread-factory.client-selector-thread-prefix=NettyClientSelector
transport.thread-factory.client-selector-thread-size=1
transport.thread-factory.client-worker-thread-prefix=NettyClientWorkerThread
transport.thread-factory.boss-thread-size=1
transport.thread-factory.worker-thread-size=8
transport.shutdown.wait=3
service.vgroup_mapping.order-service-seata-service-group=default
service.vgroup_mapping.account-service-seata-service-group=default
service.vgroup_mapping.storage-service-seata-service-group=default
service.vgroup_mapping.business-service-seata-service-group=default
service.enableDegrade=false
service.disable=false
service.max.commit.retry.timeout=-1
service.max.rollback.retry.timeout=-1
client.async.commit.buffer.limit=10000
client.lock.retry.internal=10
client.lock.retry.times=30
store.mode=db
store.file.dir=file_store/data
store.file.max-branch-session-size=16384
store.file.max-global-session-size=512
store.file.file-write-buffer-cache-size=16384
store.file.flush-disk-mode=async
store.file.session.reload.read_size=100
store.db.driver-class-name=com.mysql.jdbc.Driver
store.db.datasource=dbcp
store.db.db-type=mysql
store.db.url=jdbc:mysql://192.168.10.200:3306/seata?useUnicode=true
store.db.user=lidong
store.db.password=cwj887766@@
store.db.min-conn=1
store.db.max-conn=3
store.db.global.table=global_table
store.db.branch.table=branch_table
store.db.query-limit=100
store.db.lock-table=lock_table
recovery.committing-retry-period=1000
recovery.asyn-committing-retry-period=1000
recovery.rollbacking-retry-period=1000
recovery.timeout-retry-period=1000
transaction.undo.data.validation=true
transaction.undo.log.serialization=jackson
transaction.undo.log.save.days=7
transaction.undo.log.delete.period=86400000
transaction.undo.log.table=undo_log
transport.serialization=seata
transport.compressor=none
metrics.enabled=false
metrics.registry-type=compact
metrics.exporter-list=prometheus
metrics.exporter-prometheus-port=9898
service.default.grouplist=127.0.0.1:8091

这里主要修改了如下几项：

• store.mode :存储模式 默认file 这里我修改为db 模式 ，并且需要三个表global_table、branch_table和lock_table
• store.db.driver-class-name： 默认没有，会报错。添加了 com.mysql.jdbc.Driver
• store.db.datasource=dbcp ：数据源 dbcp
• store.db.db-type=mysql : 存储数据库的类型为mysql
• store.db.url=jdbc:mysql://192.168.10.200:3306/seata?useUnicode=true : 修改为自己的数据库url、port、数据库名称
• store.db.user=lidong :数据库的账号
• store.db.password=cwj887766@@ :数据库的密码
• service.vgroup_mapping.order-service-seata-service-group=default
• service.vgroup_mapping.account-service-seata-service-group=default
• service.vgroup_mapping.storage-service-seata-service-group=default
• service.vgroup_mapping.business-service-seata-service-group=default

也可以在 Nacos 配置页面添加，data-id 为 service.vgroup_mapping.${YOUR_SERVICE_NAME}-seata-service-group, group 为 SEATA_GROUP， 如果不添加该配置，启动后会提示no available server to connect to services-server

注意： 配置文件末尾有空行，需要删除，否则会提示失败，尽管实际上是成功的

db模式下的所需的三个表的数据库脚本位于seata\conf\db_store.sql

global_table的表结构

CREATE TABLE `global_table` (
  `xid` varchar(128) NOT NULL,
  `transaction_id` bigint(20) DEFAULT NULL,
  `status` tinyint(4) NOT NULL,
  `application_id` varchar(64) DEFAULT NULL,
  `transaction_service_group` varchar(64) DEFAULT NULL,
  `transaction_name` varchar(64) DEFAULT NULL,
  `timeout` int(11) DEFAULT NULL,
  `begin_time` bigint(20) DEFAULT NULL,
  `application_data` varchar(2000) DEFAULT NULL,
  `gmt_create` datetime DEFAULT NULL,
  `gmt_modified` datetime DEFAULT NULL,
  PRIMARY KEY (`xid`),
  KEY `idx_gmt_modified_status` (`gmt_modified`,`status`),
  KEY `idx_transaction_id` (`transaction_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

branch_table的表结构

CREATE TABLE `branch_table` (
  `branch_id` bigint(20) NOT NULL,
  `xid` varchar(128) NOT NULL,
  `transaction_id` bigint(20) DEFAULT NULL,
  `resource_group_id` varchar(32) DEFAULT NULL,
  `resource_id` varchar(256) DEFAULT NULL,
  `lock_key` varchar(128) DEFAULT NULL,
  `branch_type` varchar(8) DEFAULT NULL,
  `status` tinyint(4) DEFAULT NULL,
  `client_id` varchar(64) DEFAULT NULL,
  `application_data` varchar(2000) DEFAULT NULL,
  `gmt_create` datetime DEFAULT NULL,
  `gmt_modified` datetime DEFAULT NULL,
  PRIMARY KEY (`branch_id`),
  KEY `idx_xid` (`xid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

lock_table的表结构

create table `lock_table` (
  `row_key` varchar(128) not null,
  `xid` varchar(96),
  `transaction_id` long ,
  `branch_id` long,
  `resource_id` varchar(256) ,
  `table_name` varchar(32) ,
  `pk` varchar(32) ,
  `gmt_create` datetime ,
  `gmt_modified` datetime,
  primary key(`row_key`)
);

2.2.4 将 Seata 配置添加到 Nacos 中

使用命令如下

cd conf
sh nacos-config.sh localhost

成功后会提示

init nacos config finished, please start seata-server

在 Nacos 管理页面应该可以看到有 59 个 Group 为SEATA_GROUP的配置

2.2.5 启动 Seata Server

使用db 模式启动

 cd ..
 sh ./bin/seata-server.sh

这时候在 Nacos 的服务列表下面可以看到一个名为serverAddr的服务

3 案例分析

参考官网中用户购买商品的业务逻辑。整个业务逻辑由4个微服务提供支持：

• 库存服务：扣除给定商品的存储数量。
• 订单服务：根据购买请求创建订单。
• 帐户服务：借记用户帐户的余额。
• 业务服务：处理业务逻辑。

请求逻辑架构

3.1 github地址

springboot-dubbo-seata：https://github.com/lidong1665/springboot-dubbo-seata

• samples-common ：公共模块

• samples-account ：用户账号模块

• samples-order ：订单模块

• samples-storage ：库存模块

• samples-business ：业务模块

3.2 账户服务：AccountDubboService

/**
 * @Author: lidong
 * @Description  账户服务接口
 * @Date Created in 2019/9/5 16:37
 */
public interface AccountDubboService {

    /**
     * 从账户扣钱
     */
    ObjectResponse decreaseAccount(AccountDTO accountDTO);
}

3.3 订单服务：OrderDubboService

/**
 * @Author: lidong
 * @Description  订单服务接口
 * @Date Created in 2019/9/5 16:28
 */
public interface OrderDubboService {

    /**
     * 创建订单
     */
    ObjectResponse<OrderDTO> createOrder(OrderDTO orderDTO);
}

3.4 库存服务：StorageDubboService

/**
 * @Author: lidong
 * @Description  库存服务
 * @Date Created in 2019/9/5 16:22
 */
public interface StorageDubboService {

    /**
     * 扣减库存
     */
    ObjectResponse decreaseStorage(CommodityDTO commodityDTO);
}

3.5 业务服务：BusinessService

/**
 * @Author: lidong
 * @Description
 * @Date Created in 2019/9/5 17:17
 */
public interface BusinessService {

    /**
     * 出处理业务服务
      * @param businessDTO
     * @return
     */
    ObjectResponse handleBusiness(BusinessDTO businessDTO);
}

业务逻辑的具体实现主要体现在 订单服务的实现和业务服务的实现

订单服务的实现

@Service
public class TOrderServiceImpl extends ServiceImpl<TOrderMapper, TOrder> implements ITOrderService {

    @Reference(version = "1.0.0")
    private AccountDubboService accountDubboService;

    /**
     * 创建订单
     * @Param:  OrderDTO  订单对象
     * @Return:  OrderDTO  订单对象
     */
    @Override
    public ObjectResponse<OrderDTO> createOrder(OrderDTO orderDTO) {
        ObjectResponse<OrderDTO> response = new ObjectResponse<>();
        //扣减用户账户
        AccountDTO accountDTO = new AccountDTO();
        accountDTO.setUserId(orderDTO.getUserId());
        accountDTO.setAmount(orderDTO.getOrderAmount());
        ObjectResponse objectResponse = accountDubboService.decreaseAccount(accountDTO);

        //生成订单号
        orderDTO.setOrderNo(UUID.randomUUID().toString().replace("-",""));
        //生成订单
        TOrder tOrder = new TOrder();
        BeanUtils.copyProperties(orderDTO,tOrder);
        tOrder.setCount(orderDTO.getOrderCount());
        tOrder.setAmount(orderDTO.getOrderAmount().doubleValue());
        try {
            baseMapper.createOrder(tOrder);
        } catch (Exception e) {
            response.setStatus(RspStatusEnum.FAIL.getCode());
            response.setMessage(RspStatusEnum.FAIL.getMessage());
            return response;
        }

        if (objectResponse.getStatus() != 200) {
            response.setStatus(RspStatusEnum.FAIL.getCode());
            response.setMessage(RspStatusEnum.FAIL.getMessage());
            return response;
        }

        response.setStatus(RspStatusEnum.SUCCESS.getCode());
        response.setMessage(RspStatusEnum.SUCCESS.getMessage());
        return response;
    }
}

整个业务的实现逻辑

@Service
@Slf4j
public class BusinessServiceImpl implements BusinessService{

    @Reference(version = "1.0.0")
    private StorageDubboService storageDubboService;

    @Reference(version = "1.0.0")
    private OrderDubboService orderDubboService;

    private boolean flag;

    /**
     * 处理业务逻辑
     * @Param:
     * @Return:
     */

    @GlobalTransactional(timeoutMills = 300000, name = "dubbo-gts-seata-example")
    @Override
    public ObjectResponse handleBusiness(BusinessDTO businessDTO) {
        log.info("开始全局事务，XID = " + RootContext.getXID());
        ObjectResponse<Object> objectResponse = new ObjectResponse<>();
        //1、扣减库存
        CommodityDTO commodityDTO = new CommodityDTO();
        commodityDTO.setCommodityCode(businessDTO.getCommodityCode());
        commodityDTO.setCount(businessDTO.getCount());
        ObjectResponse storageResponse = storageDubboService.decreaseStorage(commodityDTO);
        //2、创建订单
        OrderDTO orderDTO = new OrderDTO();
        orderDTO.setUserId(businessDTO.getUserId());
        orderDTO.setCommodityCode(businessDTO.getCommodityCode());
        orderDTO.setOrderCount(businessDTO.getCount());
        orderDTO.setOrderAmount(businessDTO.getAmount());
        ObjectResponse<OrderDTO> response = orderDubboService.createOrder(orderDTO);

        //打开注释测试事务发生异常后，全局回滚功能
//        if (!flag) {
//            throw new RuntimeException("测试抛异常后，分布式事务回滚！");
//        }

        if (storageResponse.getStatus() != 200 || response.getStatus() != 200) {
            throw new DefaultException(RspStatusEnum.FAIL);
        }

        objectResponse.setStatus(RspStatusEnum.SUCCESS.getCode());
        objectResponse.setMessage(RspStatusEnum.SUCCESS.getMessage());
        objectResponse.setData(response.getData());
        return objectResponse;
    }
}

3.6 使用seata的分布式事务解决方案处理dubbo的分布式事务

我们只需要在业务处理的方法handleBusiness添加一个注解 @GlobalTransactional

@GlobalTransactional(timeoutMills = 300000, name = "dubbo-gts-seata-example")
    @Override
    public ObjectResponse handleBusiness(BusinessDTO businessDTO) {
    
    }

• timeoutMills: 超时时间
• name ：事务名称

3.7 准备数据库

注意: MySQL必须使用InnoDB engine.

创建数据库 并导入数据库脚本

DROP DATABASE IF EXISTS seata;
CREATE DATABASE seata;
USE seata;

DROP TABLE IF EXISTS `t_account`;
CREATE TABLE `t_account` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `user_id` varchar(255) DEFAULT NULL,
  `amount` double(14,2) DEFAULT '0.00',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of t_account
-- ----------------------------
INSERT INTO `t_account` VALUES ('1', '1', '4000.00');

-- ----------------------------
-- Table structure for t_order
-- ----------------------------
DROP TABLE IF EXISTS `t_order`;
CREATE TABLE `t_order` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `order_no` varchar(255) DEFAULT NULL,
  `user_id` varchar(255) DEFAULT NULL,
  `commodity_code` varchar(255) DEFAULT NULL,
  `count` int(11) DEFAULT '0',
  `amount` double(14,2) DEFAULT '0.00',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=64 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of t_order
-- ----------------------------

-- ----------------------------
-- Table structure for t_storage
-- ----------------------------
DROP TABLE IF EXISTS `t_storage`;
CREATE TABLE `t_storage` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `commodity_code` varchar(255) DEFAULT NULL,
  `name` varchar(255) DEFAULT NULL,
  `count` int(11) DEFAULT '0',
  PRIMARY KEY (`id`),
  UNIQUE KEY `commodity_code` (`commodity_code`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of t_storage
-- ----------------------------
INSERT INTO `t_storage` VALUES ('1', 'C201901140001', '水杯', '1000');

-- ----------------------------
-- Table structure for undo_log
-- 注意此处0.3.0+ 增加唯一索引 ux_undo_log
-- ----------------------------
DROP TABLE IF EXISTS `undo_log`;
CREATE TABLE `undo_log` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `branch_id` bigint(20) NOT NULL,
  `xid` varchar(100) NOT NULL,
  `context` varchar(128) NOT NULL,
  `rollback_info` longblob NOT NULL,
  `log_status` int(11) NOT NULL,
  `log_created` datetime NOT NULL,
  `log_modified` datetime NOT NULL,
  `ext` varchar(100) DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `ux_undo_log` (`xid`,`branch_id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of undo_log
-- ----------------------------
SET FOREIGN_KEY_CHECKS=1;

会看到如上的4个表

+-------------------------+
| Tables_in_seata         |
+-------------------------+
| t_account               |
| t_order                 |
| t_storage               |
| undo_log                |
+-------------------------+

这里为了简化我将这个三张表创建到一个库中,使用是三个数据源来实现。

3.8 我们以账号服务samples-account为例 ，分析需要注意的配置项目

3.8.1 引入的依赖

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <artifactId>springboot-dubbo-seata</artifactId>
    <packaging>pom</packaging>
    <name>springboot-dubbo-seata</name>
    <groupId>io.seata</groupId>
    <version>1.0.0</version>
    <description>samples-account</description》

    <properties>
        <springboot.verison>2.1.5.RELEASE</springboot.verison>
        <java.version>1.8</java.version>
        <druid.version>1.1.10</druid.version>
        <mybatis.version>1.3.2</mybatis.version>
        <mybatis-plus.version>2.3</mybatis-plus.version>
        <nacos.version>0.2.3</nacos.version>
        <lombok.version>1.16.22</lombok.version>
        <dubbo.version>2.7.3</dubbo.version>
        <nacos-client.verison>1.1.3</nacos-client.verison>
        <seata.version>0.8.0</seata.version>
        <netty.version>4.1.32.Final</netty.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>${springboot.verison}</version>
        </dependency>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <version>${springboot.verison}</version>
        </dependency>

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

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

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus</artifactId>
            <version>${mybatis-plus.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo</artifactId>
            <version>${dubbo.version}</version>
            <exclusions>
                <exclusion>
                    <artifactId>spring</artifactId>
                    <groupId>org.springframework</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>${dubbo.version}</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.dubbo/dubbo-config-spring -->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-config-spring</artifactId>
            <version>${dubbo.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-registry-nacos</artifactId>
            <version>${dubbo.version}</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/io.seata/seata-all -->
        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-all</artifactId>
            <version>${seata.version}</version>
        </dependency>


        <dependency>
            <groupId>com.alibaba.nacos</groupId>
            <artifactId>nacos-client</artifactId>
            <version>${nacos-client.verison}</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.alibaba.boot/nacos-config-spring-boot-starter -->
        <dependency>
            <groupId>com.alibaba.boot</groupId>
            <artifactId>nacos-config-spring-boot-starter</artifactId>
            <version>${nacos.version}</version>
            <exclusions>
                <exclusion>
                    <artifactId>nacos-client</artifactId>
                    <groupId>com.alibaba.nacos</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <version>${springboot.verison}</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>${lombok.version}</version>
        </dependency>


        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-all</artifactId>
            <version>${netty.version}</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.spring</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>1.0.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
    </dependencies>


    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-deploy-plugin</artifactId>
                <configuration>
                    <skip>true</skip>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

注意：

• seata-all: 这个是seata 所需的主要依赖
• dubbo-spring-boot-starter: springboot dubbo的依赖

其他的就不一一介绍，其他的一目了然，就知道是干什么的。

3.8.2 application.properties配置

server.port=8102
spring.application.name=dubbo-account-example

#====================================Dubbo配置===============================================
dubbo.application.id= dubbo-account-example
dubbo.application.name= dubbo-account-example
dubbo.protocol.id=dubbo
dubbo.protocol.name=dubbo
dubbo.registry.id=dubbo-account-example-registry
dubbo.registry.address=nacos://192.168.10.200:8848
dubbo.protocol.port=20880
dubbo.application.qosEnable=false
dubbo.config-center.address=nacos://192.168.10.200:8848
dubbo.metadata-report.address=nacos://192.168.10.200:8848

#====================================mysql 配置============================================
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://192.168.10.200:3306/seata?useSSL=false&useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true
spring.datasource.username=lidong
spring.datasource.password=cwj887766@@


#=====================================mybatis 配置======================================
mybatis.mapper-locations=classpath*:/mapper/*.xml

3.8.3 registry.conf 配置 （naocs的配置）

registry {
  # file nacos
  type = "nacos"

  nacos {
    serverAddr = "192.168.10.200"
    namespace = "public"
    cluster = "default"
  }
  file {
    name = "file.conf"
  }
}

config {
  # file、nacos 、apollo、zk、consul
  type = "nacos"

  file {
    name = "file.conf"
  }

  nacos {
    serverAddr = "192.168.10.200"
    namespace = "public"
    cluster = "default"
  }
}

3.8.5 SeataAutoConfig 配置

package io.seata.samples.integration.account.config;

import com.alibaba.druid.pool.DruidDataSource;

import io.seata.rm.datasource.DataSourceProxy;
import io.seata.spring.annotation.GlobalTransactionScanner;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

/**
 * @Author: llidong
 * @Description  seata global configuration
 * @Date Created in 2019/9/05 10:28
 */
@Configuration
public class SeataAutoConfig {

    /**
     * autowired datasource config
     */
    @Autowired
    private DataSourceProperties dataSourceProperties;

    /**
     * init durid datasource
     *
     * @Return: druidDataSource  datasource instance
     */
    @Bean
    @Primary
    public DruidDataSource druidDataSource(){
        DruidDataSource druidDataSource = new DruidDataSource();
        druidDataSource.setUrl(dataSourceProperties.getUrl());
        druidDataSource.setUsername(dataSourceProperties.getUsername());
        druidDataSource.setPassword(dataSourceProperties.getPassword());
        druidDataSource.setDriverClassName(dataSourceProperties.getDriverClassName());
        druidDataSource.setInitialSize(0);
        druidDataSource.setMaxActive(180);
        druidDataSource.setMaxWait(60000);
        druidDataSource.setMinIdle(0);
        druidDataSource.setValidationQuery("Select 1 from DUAL");
        druidDataSource.setTestOnBorrow(false);
        druidDataSource.setTestOnReturn(false);
        druidDataSource.setTestWhileIdle(true);
        druidDataSource.setTimeBetweenEvictionRunsMillis(60000);
        druidDataSource.setMinEvictableIdleTimeMillis(25200000);
        druidDataSource.setRemoveAbandoned(true);
        druidDataSource.setRemoveAbandonedTimeout(1800);
        druidDataSource.setLogAbandoned(true);
        return druidDataSource;
    }

    /**
     * init datasource proxy
     * @Param: druidDataSource  datasource bean instance
     * @Return: DataSourceProxy  datasource proxy
     */
    @Bean
    public DataSourceProxy dataSourceProxy(DruidDataSource druidDataSource){
        return new DataSourceProxy(druidDataSource);
    }

    /**
     * init mybatis sqlSessionFactory
     * @Param: dataSourceProxy  datasource proxy
     * @Return: DataSourceProxy  datasource proxy
     */
    @Bean
    public SqlSessionFactory sqlSessionFactory(DataSourceProxy dataSourceProxy) throws Exception {
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(dataSourceProxy);
        factoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources("classpath*:/mapper/*.xml"));
        return factoryBean.getObject();
    }

    /**
     * init global transaction scanner
     *
     * @Return: GlobalTransactionScanner
     */
    @Bean
    public GlobalTransactionScanner globalTransactionScanner(){
        return new GlobalTransactionScanner("account-gts-seata-example", "account-service-seata-service-group");
    }
}

其中:

@Bean
    public GlobalTransactionScanner globalTransactionScanner(){
        return new GlobalTransactionScanner("account-gts-seata-example", "account-service-seata-service-group");
    }

GlobalTransactionScanner: 初始化全局的事务扫描器

 /**
     * Instantiates a new Global transaction scanner.
     *
     * @param applicationId  the application id
     * @param txServiceGroup the default server group
     */
    public GlobalTransactionScanner(String applicationId, String txServiceGroup) {
        this(applicationId, txServiceGroup, DEFAULT_MODE);
    }

• applicationId ：为应用id 这里我传入的是account-gts-seata-example
• txServiceGroup: 默认server的分组 这里我传入的是account-service-seata-service-group 这个和我们前面在nacos 配置的是保存一致。
• DEFAULT_MODE：默认的事务模式 为AT_MODE + MT_MODE

3.8.6 AccountExampleApplication 启动类的配置

package io.seata.samples.integration.account;

import org.apache.dubbo.config.spring.context.annotation.EnableDubbo;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.config.ConfigFileApplicationListener;

@SpringBootApplication(scanBasePackages = "io.seata.samples.integration.account")
@MapperScan({"io.seata.samples.integration.account.mapper"})
@EnableDubbo(scanBasePackages = "io.seata.samples.integration.account")
public class AccountExampleApplication {

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

}

• @EnableDubbo等同于 @DubboComponentScan和 @EnableDubboConfig组合

• @DubboComponentScan 扫描 classpaths 下类中添加了 @Service 和 @Reference 将自动注入到spring beans中。

• @EnableDubboConfig 扫描的dubbo的外部化配置。

4 启动所有的sample模块

启动 samples-account、samples-order、samples-storage、samples-business

并且在nocos的控制台查看注册情况: http://192.168.10.200:8848/nacos/#/serviceManagement

我们可以看到上面的服务都已经注册成功。

5 测试

5. 1 发送一个下单请求

使用postman 发送 ：http://localhost:8104/business/dubbo/buy

参数：

{
    "userId":"1",
    "commodityCode":"C201901140001",
    "name":"fan",
    "count":50,
    "amount":"100"
}

返回

{
    "status": 200,
    "message": "成功",
    "data": null
}

这时候控制台：

2019-09-05 12:17:34.097  INFO 21860 --- [nio-8104-exec-4] i.s.s.i.c.controller.BusinessController  : 请求参数：BusinessDTO(userId=1, commodityCode=C201901140001, name=fan, count=50, amount=100)
2019-09-05 12:17:34.146  INFO 21860 --- [nio-8104-exec-4] i.seata.tm.api.DefaultGlobalTransaction  : Begin new global transaction [192.168.10.200:8091:2021380638]
2019-09-05 12:17:34.150  INFO 21860 --- [nio-8104-exec-4] i.s.s.i.c.service.BusinessServiceImpl    : 开始全局事务，XID = 192.168.10.200:8091:2021380638
2019-09-05 12:17:36.966  INFO 21860 --- [nio-8104-exec-4] i.seata.tm.api.DefaultGlobalTransaction  : [192.168.10.200:8091:2021380638] commit status:Committed

事务提交成功，

我们来看一下数据库数据变化

t_account

t_order

t_storage

数据没有问题。

5.2 测试回滚

我们samples-business将BusinessServiceImpl的handleBusiness2 下面的代码去掉注释

if (!flag) {
  throw new RuntimeException("测试抛异常后，分布式事务回滚！");
}

使用postman 发送 ：http://localhost:8104/business/dubbo/buy2

.响应结果：

{
    "timestamp": "2019-09-05T04:29:34.178+0000",
    "status": 500,
    "error": "Internal Server Error",
    "message": "测试抛异常后，分布式事务回滚！",
    "path": "/business/dubbo/buy"
}

控制台

2019-09-05 12:29:32.836  INFO 17264 --- [nio-8104-exec-2] i.s.s.i.c.controller.BusinessController  : 请求参数：BusinessDTO(userId=1, commodityCode=C201901140001, name=fan, count=50, amount=100)
2019-09-05 12:29:32.843  INFO 17264 --- [nio-8104-exec-2] i.s.common.loader.EnhancedServiceLoader  : load ContextCore[null] extension by class[io.seata.core.context.ThreadLocalContextCore]
2019-09-05 12:29:32.848  INFO 17264 --- [nio-8104-exec-2] i.s.common.loader.EnhancedServiceLoader  : load TransactionManager[null] extension by class[io.seata.tm.DefaultTransactionManager]
2019-09-05 12:29:32.849  INFO 17264 --- [nio-8104-exec-2] io.seata.tm.TransactionManagerHolder     : TransactionManager Singleton io.seata.tm.DefaultTransactionManager@461585ac
2019-09-05 12:29:32.859  INFO 17264 --- [nio-8104-exec-2] i.s.common.loader.EnhancedServiceLoader  : load LoadBalance[null] extension by class[io.seata.discovery.loadbalance.RandomLoadBalance]
2019-09-05 12:29:32.893  INFO 17264 --- [nio-8104-exec-2] i.seata.tm.api.DefaultGlobalTransaction  : Begin new global transaction [192.168.10.200:8091:2021380674]
2019-09-05 12:29:32.897  INFO 17264 --- [nio-8104-exec-2] i.s.s.i.c.service.BusinessServiceImpl    : 开始全局事务，XID = 192.168.10.200:8091:2021380674
2019-09-05 12:29:34.143  INFO 17264 --- [nio-8104-exec-2] i.seata.tm.api.DefaultGlobalTransaction  : [192.168.10.200:8091:2021380674] rollback status:Rollbacked
2019-09-05 12:29:34.158 ERROR 17264 --- [nio-8104-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.RuntimeException: 测试抛异常后，分布式事务回滚！] with root cause

java.lang.RuntimeException: 测试抛异常后，分布式事务回滚！
	at io.seata.samples.integration.call.service.BusinessServiceImpl.handleBusiness(BusinessServiceImpl.java:60) ~[classes/:na]
	at io.seata.samples.integration.call.service.BusinessServiceImpl$$FastClassBySpringCGLIB$$2ab3d645.invoke() ~[classes/:na]
	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) ~[spring-core-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:749) ~[spring-aop-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at io.seata.spring.annotation.GlobalTransactionalInterceptor$1.execute(GlobalTransactionalInterceptor.java:104) ~[seata-all-0.8.0.jar:0.8.0]
	at io.seata.tm.api.TransactionalTemplate.execute(TransactionalTemplate.java:64) ~[seata-all-0.8.0.jar:0.8.0]
	at io.seata.spring.annotation.GlobalTransactionalInterceptor.handleGlobalTransaction(GlobalTransactionalInterceptor.java:101) ~[seata-all-0.8.0.jar:0.8.0]
	at io.seata.spring.annotation.GlobalTransactionalInterceptor.invoke(GlobalTransactionalInterceptor.java:76) ~[seata-all-0.8.0.jar:0.8.0]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688) ~[spring-aop-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at io.seata.samples.integration.call.service.BusinessServiceImpl$$EnhancerBySpringCGLIB$$cb43f7ab.handleBusiness() ~[classes/:na]
	at io.seata.samples.integration.call.controller.BusinessController.handleBusiness(BusinessController.java:37) ~[classes/:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_144]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_144]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_144]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_144]
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) ~[spring-webmvc-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:892) ~[spring-webmvc-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) ~[spring-webmvc-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1039) ~[spring-webmvc-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) ~[spring-webmvc-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) ~[spring-webmvc-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908) ~[spring-webmvc-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:660) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) ~[spring-webmvc-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.19.jar:9.0.19]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92) ~[spring-web-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) [tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) [tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:836) [tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1747) [tomcat-embed-core-9.0.19.jar:9.0.19]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.19.jar:9.0.19]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_144]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_144]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.19.jar:9.0.19]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_144]

我们查看数据库数据，已经回滚，和上面的数据一致。

到这里一个简单的案例基本就分析结束。感谢你的学习。

最后想一起交流技术的可以加我wx: