Spring Cloud分布式事务快速上手（基于Seata AT模式，集成Nacos）--学习版
前言
对于从未接触过Seata的同学来说，想要快速上手Seata还是需要花费比较长的时间，因为本身微服务开发中环境的搭建、以及各种配置都已经很繁琐了，然后再集成Seata，Seata又有许多配置，对于每个微服务来说，针对Seata又有一些配置，要搞清楚各种配置之间的关系，对于像我这样的小白来说，着实不是一件容易的事。但Seata作为分布式事务的关键解决方案，在微服务架构中起着至关重要的作用。接下来，我将结合自身小白学习踩坑的过程，为大家介绍Seata的实操步骤，帮助大家少走弯路。
依赖的相关环境及组件
为了方便像我这样的小白快速上手，我只能踩着巨人的肩膀前进，本文中相关demo基本参考ruoyi-cloud官方文档中的示例（能参考别人的代码千万别自己动手写），只做了部分改造，方便验证；同时，微服务环境框架也是直接用的ruoyi-cloud，感谢每一位开源前辈无私无畏的奉献。
| 组件 | 版本 |
|---|---|
| ruoyi-cloud | v3.6.6 |
| Seata | 1.4.0 |
| Nacos | 2.5.0 |
部署Seata-server（集成Nacos）
下载Seata-server
配置Seata-server，集成Nacos
使用Nacos作为注册中心及配置中心，需要修改Seata目录下conf/registry.con中的相关配置。由于使用Nacos作为注册中心，所以conf目录下的file.conf无需理会。主要修改两个地方，一个是registry.type改为nacos(默认是file)，另一个是config.type改为nacos（默认是file）；当然，registry.nacos，和config.nacos中需要修改成自己的环境，例如Nacos地址：127.0.0.1:8848，以及username和password，修改完成后，Seata-server就会使用Nacos作为注册中心和配置中心。
javascript
registry {
# file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
type = "nacos"
loadBalance = "RandomLoadBalance"
loadBalanceVirtualNodes = 10
nacos {
application = "seata-server"
serverAddr = "127.0.0.1:8848"
group = "SEATA_GROUP"
namespace = ""
cluster = "default"
username = ""
password = ""
}
eureka {
serviceUrl = "http://localhost:8761/eureka"
application = "default"
weight = "1"
}
redis {
serverAddr = "localhost:6379"
db = 0
password = ""
cluster = "default"
timeout = 0
}
zk {
cluster = "default"
serverAddr = "127.0.0.1:2181"
sessionTimeout = 6000
connectTimeout = 2000
username = ""
password = ""
}
consul {
cluster = "default"
serverAddr = "127.0.0.1:8500"
}
etcd3 {
cluster = "default"
serverAddr = "http://localhost:2379"
}
sofa {
serverAddr = "127.0.0.1:9603"
application = "default"
region = "DEFAULT_ZONE"
datacenter = "DefaultDataCenter"
cluster = "default"
group = "SEATA_GROUP"
addressWaitTime = "3000"
}
file {
name = "file.conf"
}
}
config {
# file、nacos 、apollo、zk、consul、etcd3
type = "nacos"
nacos {
serverAddr = "127.0.0.1:8848"
namespace = ""
group = "SEATA_GROUP"
username = ""
password = ""
}
consul {
serverAddr = "127.0.0.1:8500"
}
apollo {
appId = "seata-server"
apolloMeta = "http://192.168.1.204:8801"
namespace = "application"
apolloAccesskeySecret = ""
}
zk {
serverAddr = "127.0.0.1:2181"
sessionTimeout = 6000
connectTimeout = 2000
username = ""
password = ""
}
etcd3 {
serverAddr = "http://localhost:2379"
}
file {
name = "file.conf"
}
}上传配置至Nacos配置中心
在Nacos中新建配置，dataId为seataServer.properties，group为SEATA_GROUP（与Seata-server中config.nacos.group一致），配置内容参考https://github.com/apache/incubator-seata/tree/develop/script/config-center的config.txt并按需修改保存（直达链接：[配置中心内容](https://github.com/apache/incubator-seata/tree/develop/script/config-center)）。若不想手动复制，也可使用该链接目录下/nacos/nacos-config.sh或/nacos/nacos-config.py脚本导入到Nacos，这里主要修改两个地方，同时，由于后边将会搭建三个测试微服，这里需增加事务分组的配置（事务分组的具体解释请参考Seata官网https://seata.apache.org/zh-cn/docs/v1.4/user/txgroup/transaction-group）：
如下修改为db,分布式事务的核心数据存储至数据库
store.mode=db
store.lock.mode=db
store.session.mode=db
以及配置数据库连接信息
store.db.driverClassName
store.db.url
store.db.user
store.db.password
增加事务分组配置，每个服务一个，一般都采用将key 值设置为服务端的服务名，有多少个微服务就添加多少行。
#后边会搭建账户、商品、订单三个测试微服务，这配置每个微服务的事务分组
service.vgroupMapping.ruoyi-account-group=default
service.vgroupMapping.ruoyi-order-group=default
service.vgroupMapping.ruoyi-product-group=default
java
#事务分组配置
service.vgroupMapping.ruoyi-account-group=default
service.vgroupMapping.ruoyi-order-group=default
service.vgroupMapping.ruoyi-product-group=default
#For details about configuration items, see https://seata.io/zh-cn/docs/user/configurations.html
#Transport configuration, for client and server
transport.type=TCP
transport.server=NIO
transport.heartbeat=true
transport.enableTmClientBatchSendRequest=false
transport.enableRmClientBatchSendRequest=true
transport.enableTcServerBatchSendResponse=false
transport.rpcRmRequestTimeout=30000
transport.rpcTmRequestTimeout=30000
transport.rpcTcRequestTimeout=30000
transport.threadFactory.bossThreadPrefix=NettyBoss
transport.threadFactory.workerThreadPrefix=NettyServerNIOWorker
transport.threadFactory.serverExecutorThreadPrefix=NettyServerBizHandler
transport.threadFactory.shareBossWorker=false
transport.threadFactory.clientSelectorThreadPrefix=NettyClientSelector
transport.threadFactory.clientSelectorThreadSize=1
transport.threadFactory.clientWorkerThreadPrefix=NettyClientWorkerThread
transport.threadFactory.bossThreadSize=1
transport.threadFactory.workerThreadSize=default
transport.shutdown.wait=3
transport.serialization=seata
transport.compressor=none
#Transaction routing rules configuration, only for the client
service.vgroupMapping.default_tx_group=default
#If you use a registry, you can ignore it
service.default.grouplist=127.0.0.1:8091
service.enableDegrade=false
service.disableGlobalTransaction=false
#Transaction rule configuration, only for the client
client.rm.asyncCommitBufferLimit=10000
client.rm.lock.retryInterval=10
client.rm.lock.retryTimes=30
client.rm.lock.retryPolicyBranchRollbackOnConflict=true
client.rm.reportRetryCount=5
client.rm.tableMetaCheckEnable=true
client.rm.tableMetaCheckerInterval=60000
client.rm.sqlParserType=druid
client.rm.reportSuccessEnable=false
client.rm.sagaBranchRegisterEnable=false
client.rm.sagaJsonParser=fastjson
client.rm.tccActionInterceptorOrder=-2147482648
client.tm.commitRetryCount=5
client.tm.rollbackRetryCount=5
client.tm.defaultGlobalTransactionTimeout=60000
client.tm.degradeCheck=false
client.tm.degradeCheckAllowTimes=10
client.tm.degradeCheckPeriod=2000
client.tm.interceptorOrder=-2147482648
client.undo.dataValidation=true
client.undo.logSerialization=jackson
client.undo.onlyCareUpdateColumns=true
server.undo.logSaveDays=7
server.undo.logDeletePeriod=86400000
client.undo.logTable=undo_log
client.undo.compress.enable=true
client.undo.compress.type=zip
client.undo.compress.threshold=64k
#For TCC transaction mode
tcc.fence.logTableName=tcc_fence_log
tcc.fence.cleanPeriod=1h
#Log rule configuration, for client and server
log.exceptionRate=100
#Transaction storage configuration, only for the server. The file, db, and redis configuration values are optional.
# 修改为db,分布式事务的核心数据存储至数据库
store.mode=db
store.lock.mode=db
store.session.mode=db
#Used for password encryption
store.publicKey=
#If `store.mode,store.lock.mode,store.session.mode` are not equal to `file`, you can remove the configuration block.
store.file.dir=file_store/data
store.file.maxBranchSessionSize=16384
store.file.maxGlobalSessionSize=512
store.file.fileWriteBufferCacheSize=16384
store.file.flushDiskMode=async
store.file.sessionReloadReadSize=100
#These configurations are required if the `store mode` is `db`. If `store.mode,store.lock.mode,store.session.mode` are not equal to `db`, you can remove the configuration block.
store.db.datasource=druid
store.db.dbType=mysql
store.db.driverClassName=com.mysql.jdbc.Driver
# 配置数据库连接信息
store.db.url=jdbc:mysql://127.0.0.1:3306/seata?useUnicode=true&rewriteBatchedStatements=true
store.db.user=username
store.db.password=password
store.db.minConn=5
store.db.maxConn=30
store.db.globalTable=global_table
store.db.branchTable=branch_table
store.db.distributedLockTable=distributed_lock
store.db.queryLimit=100
store.db.lockTable=lock_table
store.db.maxWait=5000
#These configurations are required if the `store mode` is `redis`. If `store.mode,store.lock.mode,store.session.mode` are not equal to `redis`, you can remove the configuration block.
store.redis.mode=single
store.redis.single.host=127.0.0.1
store.redis.single.port=6379
store.redis.sentinel.masterName=
store.redis.sentinel.sentinelHosts=
store.redis.sentinel.sentinelPassword=
store.redis.maxConn=10
store.redis.minConn=1
store.redis.maxTotal=100
store.redis.database=0
store.redis.password=
store.redis.queryLimit=100
#Transaction rule configuration, only for the server
server.recovery.committingRetryPeriod=1000
server.recovery.asynCommittingRetryPeriod=1000
server.recovery.rollbackingRetryPeriod=1000
server.recovery.timeoutRetryPeriod=1000
server.maxCommitRetryTimeout=-1
server.maxRollbackRetryTimeout=-1
server.rollbackFailedUnlockEnable=false
server.distributedLockExpireTime=10000
server.xaerNotaRetryTimeout=60000
server.session.branchAsyncQueueSize=5000
server.session.enableBranchAsyncRemove=false
server.enableParallelRequestHandle=false
#Metrics configuration, only for the server
metrics.enabled=false
metrics.registryType=compact
metrics.exporterList=prometheus
metrics.exporterPrometheusPort=9898导入Seata-server所需SQL
前面我们已经配置了Seata使用mysql作为db高可用数据库(store.mode=db)，故需要在mysql创建一个seata库(store.db.url中配置的库名)，并导入数据库脚本。可以从GitHub仓库https://github.com/apache/incubator-seata/blob/develop/script/server/db下载不同数据库的SQL脚本（直达链接：[mysql数据库脚本](https://github.com/apache/incubator-seata/blob/develop/script/server/db/mysql.sql)），下载后将SQL导入数据库中。
sql
-- -------------------------------- The script used when storeMode is 'db' --------------------------------
-- the table to store GlobalSession data
CREATE TABLE IF NOT EXISTS `global_table`
(
`xid` VARCHAR(128) NOT NULL,
`transaction_id` BIGINT,
`status` TINYINT NOT NULL,
`application_id` VARCHAR(32),
`transaction_service_group` VARCHAR(32),
`transaction_name` VARCHAR(128),
`timeout` INT,
`begin_time` BIGINT,
`application_data` VARCHAR(2000),
`gmt_create` DATETIME,
`gmt_modified` DATETIME,
PRIMARY KEY (`xid`),
KEY `idx_status_gmt_modified` (`status` , `gmt_modified`),
KEY `idx_transaction_id` (`transaction_id`)
) ENGINE = InnoDB
DEFAULT CHARSET = utf8mb4;
-- the table to store BranchSession data
CREATE TABLE IF NOT EXISTS `branch_table`
(
`branch_id` BIGINT NOT NULL,
`xid` VARCHAR(128) NOT NULL,
`transaction_id` BIGINT,
`resource_group_id` VARCHAR(32),
`resource_id` VARCHAR(256),
`branch_type` VARCHAR(8),
`status` TINYINT,
`client_id` VARCHAR(64),
`application_data` VARCHAR(2000),
`gmt_create` DATETIME(6),
`gmt_modified` DATETIME(6),
PRIMARY KEY (`branch_id`),
KEY `idx_xid` (`xid`)
) ENGINE = InnoDB
DEFAULT CHARSET = utf8mb4;
-- the table to store lock data
CREATE TABLE IF NOT EXISTS `lock_table`
(
`row_key` VARCHAR(128) NOT NULL,
`xid` VARCHAR(128),
`transaction_id` BIGINT,
`branch_id` BIGINT NOT NULL,
`resource_id` VARCHAR(256),
`table_name` VARCHAR(32),
`pk` VARCHAR(36),
`status` TINYINT NOT NULL DEFAULT '0' COMMENT '0:locked ,1:rollbacking',
`gmt_create` DATETIME,
`gmt_modified` DATETIME,
PRIMARY KEY (`row_key`),
KEY `idx_status` (`status`),
KEY `idx_branch_id` (`branch_id`),
KEY `idx_xid` (`xid`)
) ENGINE = InnoDB
DEFAULT CHARSET = utf8mb4;
CREATE TABLE IF NOT EXISTS `distributed_lock`
(
`lock_key` CHAR(20) NOT NULL,
`lock_value` VARCHAR(20) NOT NULL,
`expire` BIGINT,
primary key (`lock_key`)
) ENGINE = InnoDB
DEFAULT CHARSET = utf8mb4;
INSERT INTO `distributed_lock` (lock_key, lock_value, expire) VALUES ('AsyncCommitting', ' ', 0);
INSERT INTO `distributed_lock` (lock_key, lock_value, expire) VALUES ('RetryCommitting', ' ', 0);
INSERT INTO `distributed_lock` (lock_key, lock_value, expire) VALUES ('RetryRollbacking', ' ', 0);
INSERT INTO `distributed_lock` (lock_key, lock_value, expire) VALUES ('TxTimeoutCheck', ' ', 0);至此，Seata-server已经配置完成并且集成了Nacos,事务数据也存储在DB中。可以点击Seata目录下bin/seata-server.bat脚本启动Seata-server。
搭建测试微服务
创建测试库及表
sql
# 订单数据库信息 seata_order
DROP DATABASE IF EXISTS seata_order;
CREATE DATABASE seata_order;
DROP TABLE IF EXISTS seata_order.p_order;
CREATE TABLE seata_order.p_order
(
id INT(11) NOT NULL AUTO_INCREMENT,
user_id INT(11) DEFAULT NULL,
product_id INT(11) DEFAULT NULL,
amount INT(11) DEFAULT NULL,
total_price DOUBLE DEFAULT NULL,
status VARCHAR(100) DEFAULT NULL,
add_time DATETIME DEFAULT CURRENT_TIMESTAMP,
last_update_time DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (id)
) ENGINE = InnoDB
AUTO_INCREMENT = 1
DEFAULT CHARSET = utf8mb4;
DROP TABLE IF EXISTS seata_order.undo_log;
CREATE TABLE seata_order.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,
PRIMARY KEY (id),
UNIQUE KEY ux_undo_log (xid, branch_id)
) ENGINE = InnoDB
AUTO_INCREMENT = 1
DEFAULT CHARSET = utf8mb4;
# 产品数据库信息 seata_product
DROP DATABASE IF EXISTS seata_product;
CREATE DATABASE seata_product;
DROP TABLE IF EXISTS seata_product.product;
CREATE TABLE seata_product.product
(
id INT(11) NOT NULL AUTO_INCREMENT,
price DOUBLE DEFAULT NULL,
stock INT(11) DEFAULT NULL,
last_update_time DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (id)
) ENGINE = InnoDB
AUTO_INCREMENT = 1
DEFAULT CHARSET = utf8mb4;
DROP TABLE IF EXISTS seata_product.undo_log;
CREATE TABLE seata_product.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,
PRIMARY KEY (id),
UNIQUE KEY ux_undo_log (xid, branch_id)
) ENGINE = InnoDB
AUTO_INCREMENT = 1
DEFAULT CHARSET = utf8mb4;
INSERT INTO seata_product.product (id, price, stock)
VALUES (1, 10, 20);
# 账户数据库信息 seata_account
DROP DATABASE IF EXISTS seata_account;
CREATE DATABASE seata_account;
DROP TABLE IF EXISTS seata_account.account;
CREATE TABLE seata_account.account
(
id INT(11) NOT NULL AUTO_INCREMENT,
balance DOUBLE DEFAULT NULL,
last_update_time DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (id)
) ENGINE = InnoDB
AUTO_INCREMENT = 1
DEFAULT CHARSET = utf8mb4;
DROP TABLE IF EXISTS seata_account.undo_log;
CREATE TABLE seata_account.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,
PRIMARY KEY (id),
UNIQUE KEY ux_undo_log (xid, branch_id)
) ENGINE = InnoDB
AUTO_INCREMENT = 1
DEFAULT CHARSET = utf8mb4;
INSERT INTO seata_account.account (id, balance)
VALUES (1, 50);其中，每个库中的undo_log表，是Seata AT模式必须创建的表，主要用于分支事务的回滚，undo_log表可以从GitHub仓库https://github.com/apache/incubator-seata/tree/develop/script/client/at/db下载不同数据库的SQL脚本（直达链接：[mysql数据库脚本](https://github.com/apache/incubator-seata/blob/develop/script/client/at/db/mysql.sql)）。另外，考虑到测试方便，我们插入了一条id = 1的account记录，和一条id = 1的product记录。
搭建测试服务
搭建账户服务
在ruoyi-modules新建一个Module：ruoyi-account，为了搭建方便，以及减少Maven依赖，pom依赖直接拷贝ruoyi-system中的依赖，然后新增Seata的依赖就可以了。
ruoyi-account的pom.xml:
xml
<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.ruoyi</groupId>
<artifactId>ruoyi-modules</artifactId>
<version>3.6.6</version>
</parent>
<artifactId>ruoyi-account</artifactId>
<packaging>jar</packaging>
<name>ruoyi-account</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<!-- SpringCloud Alibaba Nacos -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<!-- SpringCloud Alibaba Nacos Config -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>
<!-- SpringCloud Alibaba Sentinel -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
</dependency>
<!-- SpringBoot Actuator -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!-- Mysql Connector -->
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
</dependency>
<!-- RuoYi Common DataSource -->
<dependency>
<groupId>com.ruoyi</groupId>
<artifactId>ruoyi-common-datasource</artifactId>
</dependency>
<!-- RuoYi Common DataScope -->
<dependency>
<groupId>com.ruoyi</groupId>
<artifactId>ruoyi-common-datascope</artifactId>
</dependency>
<!-- RuoYi Common Log -->
<dependency>
<groupId>com.ruoyi</groupId>
<artifactId>ruoyi-common-log</artifactId>
</dependency>
<!-- RuoYi Common Swagger -->
<dependency>
<groupId>com.ruoyi</groupId>
<artifactId>ruoyi-common-swagger</artifactId>
</dependency>
<!-- SpringBoot Seata -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-seata</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
</dependencies>
<build>
<finalName>${project.artifactId}</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>ruoyi-account的bootstrap.yml:
yaml
# Tomcat
server:
port: 10300
# Spring
spring:
application:
# 应用名称
name: ruoyi-account
profiles:
# 环境配置
active: dev
cloud:
nacos:
discovery:
# 服务注册地址
server-addr: 127.0.0.1:8848
config:
# 配置中心地址
server-addr: 127.0.0.1:8848
# 配置文件格式
file-extension: yml
# 共享配置
shared-configs:
- application-${spring.profiles.active}.${spring.cloud.nacos.config.file-extension}
seata:
enabled: true
# Seata 应用编号，默认为 ${spring.application.name}
application-id: ${spring.application.name}
# Seata 事务组编号，用于 TC 集群名
tx-service-group: ${spring.application.name}-group
# 关闭自动代理
enable-auto-data-source-proxy: false
# 服务配置项
service:
# 虚拟组和分组的映射
vgroup-mapping:
ruoyi-account-group: default
config:
type: nacos
nacos:
serverAddr: 127.0.0.1:8848
group: SEATA_GROUP
namespace:
dataId: seataServer.properties
registry:
type: nacos
nacos:
application: seata-server
server-addr: 127.0.0.1:8848
namespace:ruoyi-account的bootstrap.yml也是直接拷贝ruoyi-system中的bootstrap.yml，然后修改服务端口，服务名；为了演示方便，关于Seata的配置也直接写在了bootstrap.yml。
ruoyi-account的ruoyi-account-dev.yml:
yaml
# spring配置
spring:
redis:
host: localhost
port: 6379
password:
datasource:
druid:
stat-view-servlet:
enabled: true
loginUsername: ruoyi
loginPassword: 123456
dynamic:
druid:
initial-size: 5
min-idle: 5
maxActive: 20
maxWait: 60000
connectTimeout: 30000
socketTimeout: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
maxPoolPreparedStatementPerConnectionSize: 20
filters: stat,slf4j
connectionProperties: druid.stat.mergeSql\=true;druid.stat.slowSqlMillis\=5000
datasource:
# 主库数据源
master:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/seata_account?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8
username: root
password: root123
# 从库数据源
# slave:
# username:
# password:
# url:
# driver-class-name:
seata: true #开启seata代理，开启后默认每个数据源都代理，如果某个不需要代理可单独关闭
# mybatis配置
mybatis:
# 搜索指定包别名
typeAliasesPackage: com.ruoyi.account
# 配置mapper的扫描，找到所有的mapper.xml映射文件
mapperLocations: classpath:mapper/**/*.xml
# springdoc配置
springdoc:
gatewayUrl: http://localhost:8080/${spring.application.name}
api-docs:
# 是否开启接口文档
enabled: falseruoyi-account的ruoyi-account-dev.yml也是直接拷贝ruoyi-system中的ruoyi-system-dev.yml，仅修改数据库连接信息，MyBatis扫描的包等，唯一比较重要的一点是动态数据源这里配置了seata:true，开启Seata代理。
ruoyi-account示例代码:
** Account.java**
java
package com.ruoyi.account.domain;
import lombok.Getter;
import lombok.Setter;
import java.util.Date;
@Getter
@Setter
public class Account {
private Long id;
/**
* 余额
*/
private Double balance;
private Date lastUpdateTime;
}** AccountMapper.java**
java
package com.ruoyi.account.mapper;
import com.ruoyi.account.domain.Account;
public interface AccountMapper {
public Account selectById(Long userId);
public void updateById(Account account);
}** AccountMapper.xml**
xml
<?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.ruoyi.account.mapper.AccountMapper">
<resultMap type="com.ruoyi.account.domain.Account" id="AccountResult">
<id property="id" column="id" />
<result property="balance" column="balance" />
<result property="lastUpdateTime" column="last_update_time" />
</resultMap>
<select id="selectById" parameterType="com.ruoyi.account.domain.Account" resultMap="AccountResult">
select id, balance, last_update_time
from account where id = #{userId}
</select>
<update id="updateById" parameterType="com.ruoyi.account.domain.Account">
update account set balance = #{balance}, last_update_time = sysdate() where id = #{id}
</update>
</mapper>** AccountService.java**
java
package com.ruoyi.account.service;
public interface AccountService {
/**
* 账户扣减
* @param userId 用户 ID
* @param price 扣减金额
*/
void reduceBalance(Long userId, Double price);
}** AccountServiceImpl.java**
java
package com.ruoyi.account.service.impl;
import javax.annotation.Resource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import com.baomidou.dynamic.datasource.annotation.DS;
import com.ruoyi.account.domain.Account;
import com.ruoyi.account.mapper.AccountMapper;
import com.ruoyi.account.service.AccountService;
import io.seata.core.context.RootContext;
@Service
public class AccountServiceImpl implements AccountService
{
private static final Logger log = LoggerFactory.getLogger(AccountServiceImpl.class);
@Resource
private AccountMapper accountMapper;
/**
* 事务传播特性设置为 REQUIRES_NEW 开启新的事务 重要！！！！一定要使用REQUIRES_NEW
* 在若依的示例中，事务的传播特性必须设置REQUIRES_NEW，但经本人测试，多服务调用事务
* 设置成默认的REQUIRED也能回滚成功
*/
@Override
@Transactional
public void reduceBalance(Long userId, Double price)
{
log.info("=============ACCOUNT START=================");
log.info("当前 XID: {}", RootContext.getXID());
Account account = accountMapper.selectById(userId);
Double balance = account.getBalance();
log.info("下单用户{}余额为 {},商品总价为{}", userId, balance, price);
if (balance < price)
{
log.warn("用户 {} 余额不足，当前余额:{}", userId, balance);
throw new RuntimeException("余额不足");
}
log.info("开始扣减用户 {} 余额", userId);
double currentBalance = account.getBalance() - price;
account.setBalance(currentBalance);
accountMapper.updateById(account);
log.info("扣减用户 {} 余额成功,扣减后用户账户余额为{}", userId, currentBalance);
log.info("=============ACCOUNT END=================");
}
}** AccountController.java**
java
package com.ruoyi.account.controller;
import com.ruoyi.account.dto.ReduceBalanceRequest;
import com.ruoyi.account.service.AccountService;
import com.ruoyi.common.core.domain.R;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.validation.annotation.Validated;
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;
@RestController
@RequestMapping("/account")
public class AccountController {
@Autowired
private AccountService accountService;
@PostMapping("/reduceBalance")
public R reduceBalance(@Validated @RequestBody ReduceBalanceRequest request) {
accountService.reduceBalance(request.getUserId(), request.getPrice());
return R.ok("下单成功");
}
}** ReduceBalanceRequest.java**
java
package com.ruoyi.account.dto;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
public class ReduceBalanceRequest {
private Long userId;
private Double price;
}至此，账户服务就搭建好了，这里主要提供一个扣减账户余额的接口。
搭建商品服务
同样，在ruoyi-modules新建一个Module：ruoyi-product。
ruoyi-product的pom.xml:
xml
<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.ruoyi</groupId>
<artifactId>ruoyi-modules</artifactId>
<version>3.6.6</version>
</parent>
<artifactId>ruoyi-product</artifactId>
<packaging>jar</packaging>
<name>ruoyi-product</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<!-- SpringCloud Alibaba Nacos -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<!-- SpringCloud Alibaba Nacos Config -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>
<!-- SpringCloud Alibaba Sentinel -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
</dependency>
<!-- SpringBoot Actuator -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!-- Mysql Connector -->
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
</dependency>
<!-- RuoYi Common DataSource -->
<dependency>
<groupId>com.ruoyi</groupId>
<artifactId>ruoyi-common-datasource</artifactId>
</dependency>
<!-- RuoYi Common DataScope -->
<dependency>
<groupId>com.ruoyi</groupId>
<artifactId>ruoyi-common-datascope</artifactId>
</dependency>
<!-- RuoYi Common Log -->
<dependency>
<groupId>com.ruoyi</groupId>
<artifactId>ruoyi-common-log</artifactId>
</dependency>
<!-- RuoYi Common Swagger -->
<dependency>
<groupId>com.ruoyi</groupId>
<artifactId>ruoyi-common-swagger</artifactId>
</dependency>
<!-- SpringBoot Seata -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-seata</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
</dependencies>
<build>
<finalName>${project.artifactId}</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>ruoyi-product的bootstrap.yml:
yaml
# Tomcat
server:
port: 10302
# Spring
spring:
application:
# 应用名称
name: ruoyi-product
profiles:
# 环境配置
active: dev
cloud:
nacos:
discovery:
# 服务注册地址
server-addr: 127.0.0.1:8848
config:
# 配置中心地址
server-addr: 127.0.0.1:8848
# 配置文件格式
file-extension: yml
# 共享配置
shared-configs:
- application-${spring.profiles.active}.${spring.cloud.nacos.config.file-extension}
seata:
enabled: true
# Seata 应用编号，默认为 ${spring.application.name}
application-id: ${spring.application.name}
# Seata 事务组编号，用于 TC 集群名
tx-service-group: ${spring.application.name}-group
# 关闭自动代理
enable-auto-data-source-proxy: false
# 服务配置项
service:
# 虚拟组和分组的映射
vgroup-mapping:
ruoyi-product-group: default
config:
type: nacos
nacos:
serverAddr: 127.0.0.1:8848
group: SEATA_GROUP
namespace:
dataId: seataServer.properties
registry:
type: nacos
nacos:
application: seata-server
server-addr: 127.0.0.1:8848
namespace:ruoyi-product的ruoyi-product-dev.yml:
yaml
# spring配置
spring:
redis:
host: localhost
port: 6379
password:
datasource:
druid:
stat-view-servlet:
enabled: true
loginUsername: ruoyi
loginPassword: 123456
dynamic:
druid:
initial-size: 5
min-idle: 5
maxActive: 20
maxWait: 60000
connectTimeout: 30000
socketTimeout: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
maxPoolPreparedStatementPerConnectionSize: 20
filters: stat,slf4j
connectionProperties: druid.stat.mergeSql\=true;druid.stat.slowSqlMillis\=5000
datasource:
# 主库数据源
master:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/seata_product?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8
username: root
password: root123
# 从库数据源
# slave:
# username:
# password:
# url:
# driver-class-name:
seata: true
# mybatis配置
mybatis:
# 搜索指定包别名
typeAliasesPackage: com.ruoyi.product
# 配置mapper的扫描，找到所有的mapper.xml映射文件
mapperLocations: classpath:mapper/**/*.xml
# springdoc配置
springdoc:
gatewayUrl: http://localhost:8080/${spring.application.name}
api-docs:
# 是否开启接口文档
enabled: false ruoyi-product示例代码:
** Product.java**
java
package com.ruoyi.product.domain;
import lombok.Getter;
import lombok.Setter;
import java.util.Date;
@Getter
@Setter
public class Product {
private Integer id;
/**
* 价格
*/
private Double price;
/**
* 库存
*/
private Integer stock;
private Date lastUpdateTime;
}** ProductMapper.java**
java
package com.ruoyi.product.mapper;
import com.ruoyi.product.domain.Product;
public interface ProductMapper {
public Product selectById(Long productId);
public void updateById(Product product);
}** ProductMapper.xml**
xml
<?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.ruoyi.product.mapper.ProductMapper">
<resultMap type="com.ruoyi.product.domain.Product" id="ProductResult">
<id property="id" column="id" />
<result property="price" column="price" />
<result property="stock" column="stock" />
<result property="lastUpdateTime" column="last_update_time" />
</resultMap>
<select id="selectById" parameterType="com.ruoyi.product.domain.Product" resultMap="ProductResult">
select id, price, stock, last_update_time
from product where id = #{productId}
</select>
<update id="updateById" parameterType="com.ruoyi.product.domain.Product">
update product set price = #{price}, stock = #{stock}, last_update_time = sysdate() where id = #{id}
</update>
</mapper>** ProductService.java**
java
package com.ruoyi.product.service;
public interface ProductService {
/**
* 扣减库存
*
* @param productId 商品 ID
* @param amount 扣减数量
* @return 商品总价
*/
Double reduceStock(Long productId, Integer amount);
}** ProductServiceImpl.java**
java
package com.ruoyi.product.service.impl;
import javax.annotation.Resource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import com.baomidou.dynamic.datasource.annotation.DS;
import com.ruoyi.product.domain.Product;
import com.ruoyi.product.mapper.ProductMapper;
import com.ruoyi.product.service.ProductService;
import io.seata.core.context.RootContext;
@Service
public class ProductServiceImpl implements ProductService {
private static final Logger log = LoggerFactory.getLogger(ProductServiceImpl.class);
@Resource
private ProductMapper productMapper;
/**
* 事务传播特性设置为 REQUIRES_NEW 开启新的事务 重要！！！！一定要使用REQUIRES_NEW
* 在若依的示例中，事务的传播特性必须设置REQUIRES_NEW，但经本人测试，多服务调用事务
* 设置成默认的REQUIRED也能回滚成功
*/
@Transactional
@Override
public Double reduceStock(Long productId, Integer amount)
{
log.info("=============PRODUCT START=================");
log.info("当前 XID: {}", RootContext.getXID());
// 检查库存
Product product = productMapper.selectById(productId);
Integer stock = product.getStock();
log.info("商品编号为 {} 的库存为{},订单商品数量为{}", productId, stock, amount);
if (stock < amount)
{
log.warn("商品编号为{} 库存不足，当前库存:{}", productId, stock);
throw new RuntimeException("库存不足");
}
log.info("开始扣减商品编号为 {} 库存,单价商品价格为{}", productId, product.getPrice());
// 扣减库存
int currentStock = stock - amount;
product.setStock(currentStock);
productMapper.updateById(product);
double totalPrice = product.getPrice() * amount;
log.info("扣减商品编号为 {} 库存成功,扣减后库存为{}, {} 件商品总价为 {} ", productId, currentStock, amount, totalPrice);
log.info("=============PRODUCT END=================");
return totalPrice;
}
}** ProductController.java**
java
package com.ruoyi.product.controller;
import com.ruoyi.common.core.domain.R;
import com.ruoyi.product.dto.ReduceStockRequest;
import com.ruoyi.product.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.validation.annotation.Validated;
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;
@RestController
@RequestMapping("/product")
public class ProductController {
@Autowired
private ProductService productService;
@PostMapping("/reduceStock")
public R<Double> reduceStock(@Validated @RequestBody ReduceStockRequest request) {
Double d = productService.reduceStock(request.getProductId(), request.getAmount());
return R.ok(d);
}
}** ReduceStockRequest.java**
java
package com.ruoyi.product.dto;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
public class ReduceStockRequest {
private Long productId;
private Integer amount;
}至此，商品服务就搭建好了，这里主要提供一个扣减商品库存的接口。
创建服务调用模块
在ruoyi-modules新建一个Module：ruoyi-call（当你也可以不新建Module，直接把Feign接口写在具调用的服务中，这里新建Module主是为了更好的体现模块之间的低耦合），该模块主要的作用是提供Feign接口，用于订单服务调用商品及账户服务，为了搭建方便，以及减少Maven依赖，pom依赖直接拷贝ruoyi-api-system中的依赖。
ruoyi-call的pom.xml:
xml
<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.ruoyi</groupId>
<artifactId>ruoyi-modules</artifactId>
<version>3.6.6</version>
</parent>
<artifactId>ruoyi-call</artifactId>
<packaging>jar</packaging>
<name>ruoyi-call</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>com.ruoyi</groupId>
<artifactId>ruoyi-common-core</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
</dependencies>
</project> ruoyi-call示例代码:
** AccountFeignService.java**
java
package com.ruoyi.call.feign;
import com.ruoyi.call.dto.ReduceBalanceRequest;
import com.ruoyi.common.core.domain.R;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
@FeignClient(name = "ruoyi-account")
public interface AccountFeignService {
@PostMapping("/account/reduceBalance")
R reduceBalance(@RequestBody ReduceBalanceRequest request);
}** ProductFeignService.java**
java
package com.ruoyi.call.feign;
import com.ruoyi.call.dto.ReduceStockRequest;
import com.ruoyi.common.core.domain.R;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
@FeignClient(name = "ruoyi-product")
public interface ProductFeignService {
@PostMapping("/product/reduceStock")
R<Double> reduceStock(@RequestBody ReduceStockRequest request);
}** ReduceBalanceRequest.java**
java
package com.ruoyi.call.dto;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
public class ReduceBalanceRequest {
private Long userId;
private Double price;
}** ReduceStockRequest.java**
java
package com.ruoyi.call.dto;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
public class ReduceStockRequest {
private Long productId;
private Integer amount;
}至此，服务调用模块就创建好了，这里主要提供Feign接口，供订单服务调用。
搭建订单服务
在ruoyi-modules新建一个Module：ruoyi-order，为了搭建方便，以及减少Maven依赖，pom依赖直接拷贝ruoyi-system中的依赖，然后新增Seata的依赖，再就是引入创刚建的服务调用模块。
ruoyi-order的pom.xml:
xml
<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.ruoyi</groupId>
<artifactId>ruoyi-modules</artifactId>
<version>3.6.6</version>
</parent>
<artifactId>ruoyi-order</artifactId>
<packaging>jar</packaging>
<name>ruoyi-order</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<!-- SpringCloud Alibaba Nacos -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<!-- SpringCloud Alibaba Nacos Config -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>
<!-- SpringCloud Alibaba Sentinel -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
</dependency>
<!-- SpringBoot Actuator -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!-- Mysql Connector -->
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
</dependency>
<!-- RuoYi Common DataSource -->
<dependency>
<groupId>com.ruoyi</groupId>
<artifactId>ruoyi-common-datasource</artifactId>
</dependency>
<!-- RuoYi Common DataScope -->
<dependency>
<groupId>com.ruoyi</groupId>
<artifactId>ruoyi-common-datascope</artifactId>
</dependency>
<!-- RuoYi Common Log -->
<dependency>
<groupId>com.ruoyi</groupId>
<artifactId>ruoyi-common-log</artifactId>
</dependency>
<!-- RuoYi Common Swagger -->
<dependency>
<groupId>com.ruoyi</groupId>
<artifactId>ruoyi-common-swagger</artifactId>
</dependency>
<!-- SpringBoot Seata -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-seata</artifactId>
</dependency>
<dependency>
<groupId>com.ruoyi</groupId>
<artifactId>ruoyi-call</artifactId>
<version>3.6.6</version>
</dependency>
</dependencies>
<build>
<finalName>${project.artifactId}</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>ruoyi-order的bootstrap.yml:
yaml
# Tomcat
server:
port: 10301
# Spring
spring:
application:
# 应用名称
name: ruoyi-order
profiles:
# 环境配置
active: dev
cloud:
nacos:
discovery:
# 服务注册地址
server-addr: 127.0.0.1:8848
config:
# 配置中心地址
server-addr: 127.0.0.1:8848
# 配置文件格式
file-extension: yml
# 共享配置
shared-configs:
- application-${spring.profiles.active}.${spring.cloud.nacos.config.file-extension}
seata:
enabled: true
# Seata 应用编号，默认为 ${spring.application.name}
application-id: ${spring.application.name}
# Seata 事务组编号，用于 TC 集群名
tx-service-group: ${spring.application.name}-group
# 关闭自动代理
enable-auto-data-source-proxy: false
# 服务配置项
service:
# 虚拟组和分组的映射
vgroup-mapping:
ruoyi-order-group: default
config:
type: nacos
nacos:
serverAddr: 127.0.0.1:8848
group: SEATA_GROUP
namespace:
dataId: seataServer.properties
registry:
type: nacos
nacos:
application: seata-server
server-addr: 127.0.0.1:8848
namespace:ruoyi-order的ruoyi-order-dev.yml:
yaml
# spring配置
spring:
redis:
host: localhost
port: 6379
password:
datasource:
druid:
stat-view-servlet:
enabled: true
loginUsername: ruoyi
loginPassword: 123456
dynamic:
druid:
initial-size: 5
min-idle: 5
maxActive: 20
maxWait: 60000
connectTimeout: 30000
socketTimeout: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
maxPoolPreparedStatementPerConnectionSize: 20
filters: stat,slf4j
connectionProperties: druid.stat.mergeSql\=true;druid.stat.slowSqlMillis\=5000
datasource:
# 主库数据源
master:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/seata_order?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8
username: root
password: root123
# 从库数据源
# slave:
# username:
# password:
# url:
# driver-class-name:
seata: true
# mybatis配置
mybatis:
# 搜索指定包别名
typeAliasesPackage: com.ruoyi.order
# 配置mapper的扫描，找到所有的mapper.xml映射文件
mapperLocations: classpath:mapper/**/*.xml
# springdoc配置
springdoc:
gatewayUrl: http://localhost:8080/${spring.application.name}
api-docs:
# 是否开启接口文档
enabled: false ruoyi-order示例代码:
** Order.java**
java
package com.ruoyi.order.domain;
import lombok.Getter;
import lombok.Setter;
@Getter
@Setter
public class Order {
private Integer id;
/**
* 用户ID
*/
private Long userId;
/**
* 商品ID
*/
private Long productId;
/**
* 订单状态
*/
private int status;
/**
* 数量
*/
private Integer amount;
/**
* 总金额
*/
private Double totalPrice;
public Order()
{
}
public Order(Long userId, Long productId, int status, Integer amount)
{
this.userId = userId;
this.productId = productId;
this.status = status;
this.amount = amount;
}
}** OrderMapper.java**
java
package com.ruoyi.order.mapper;
import com.ruoyi.order.domain.Order;
public interface OrderMapper {
public void insert(Order order);
public void updateById(Order order);
}** OrderMapper.xml**
xml
<?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.ruoyi.order.mapper.OrderMapper">
<resultMap type="com.ruoyi.order.domain.Order" id="OrderResult">
<id property="id" column="id" />
<result property="userId" column="user_id" />
<result property="productId" column="product_id" />
<result property="amount" column="amount" />
<result property="totalPrice" column="total_price" />
<result property="status" column="status" />
</resultMap>
<insert id="insert" parameterType="com.ruoyi.order.domain.Order" useGeneratedKeys="true" keyProperty="id">
insert into p_order (
<if test="userId != null and userId != '' ">user_id,</if>
<if test="productId != null and productId != '' ">product_id,</if>
<if test="amount != null and amount != '' ">amount,</if>
<if test="totalPrice != null and totalPrice != '' ">total_price,</if>
<if test="status != null and status != ''">status,</if>
add_time
)values(
<if test="userId != null and userId != ''">#{userId},</if>
<if test="productId != null and productId != ''">#{productId},</if>
<if test="amount != null and amount != ''">#{amount},</if>
<if test="totalPrice != null and totalPrice != ''">#{totalPrice},</if>
<if test="status != null and status != ''">#{status},</if>
sysdate()
)
</insert>
<update id="updateById" parameterType="com.ruoyi.order.domain.Order">
update p_order
<set>
<if test="userId != null and userId != ''">user_id = #{userId},</if>
<if test="productId != null and productId != ''">product_id = #{productId},</if>
<if test="amount != null and amount != ''">amount = #{amount},</if>
<if test="totalPrice != null and totalPrice != ''">total_price = #{totalPrice},</if>
<if test="status != null and status != ''">status = #{status},</if>
last_update_time = sysdate()
</set>
where id = #{id}
</update>
</mapper>** OrderService.java**
java
package com.ruoyi.order.service;
import com.ruoyi.order.dto.PlaceOrderRequest;
public interface OrderService {
/**
* 下单
*
* @param placeOrderRequest 订单请求参数
*/
void placeOrder(PlaceOrderRequest placeOrderRequest);
}** OrderServiceImpl.java**
java
package com.ruoyi.order.service.impl;
import javax.annotation.Resource;
import com.ruoyi.call.dto.ReduceBalanceRequest;
import com.ruoyi.call.dto.ReduceStockRequest;
import com.ruoyi.call.feign.AccountFeignService;
import com.ruoyi.call.feign.ProductFeignService;
import com.ruoyi.common.core.domain.R;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.baomidou.dynamic.datasource.annotation.DS;
import com.ruoyi.order.domain.Order;
import com.ruoyi.order.dto.PlaceOrderRequest;
import com.ruoyi.order.mapper.OrderMapper;
import com.ruoyi.order.service.OrderService;
import io.seata.core.context.RootContext;
import io.seata.spring.annotation.GlobalTransactional;
@Service
public class OrderServiceImpl implements OrderService {
private static final Logger log = LoggerFactory.getLogger(OrderServiceImpl.class);
@Resource
private OrderMapper orderMapper;
@Autowired
private ProductFeignService productFeignService;
@Autowired
private AccountFeignService accountFeignService;
@Override
@Transactional
@GlobalTransactional // 重点 第一个开启事务的需要添加seata全局事务注解
public void placeOrder(PlaceOrderRequest request) {
log.info("=============ORDER START=================");
Long userId = request.getUserId();
Long productId = request.getProductId();
Integer amount = request.getAmount();
log.info("收到下单请求,用户:{}, 商品:{},数量:{}", userId, productId, amount);
log.info("当前 XID: {}", RootContext.getXID());
Order order = new Order(userId, productId, 0, amount);
orderMapper.insert(order);
log.info("订单一阶段生成，等待扣库存付款中");
// 扣减库存并计算总价
// Double totalPrice = productService.reduceStock(productId, amount);
// // 扣减余额
// accountService.reduceBalance(userId, totalPrice);
// 扣减库存并计算总价
R<Double> r = productFeignService.reduceStock(new ReduceStockRequest(productId, amount));
if (r.getCode() != 200) {
throw new RuntimeException("扣减库存失败");
}
Double totalPrice = r.getData();
// 扣减余额
R r1 = accountFeignService.reduceBalance(new ReduceBalanceRequest(userId, totalPrice));
if (r1.getCode() != 200) {
throw new RuntimeException("扣减余额失败");
}
order.setStatus(1);
order.setTotalPrice(totalPrice);
orderMapper.updateById(order);
log.info("订单已成功下单");
log.info("=============ORDER END=================");
}
}** OrderController.java**
java
package com.ruoyi.order.controller;
import com.ruoyi.common.core.domain.R;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.validation.annotation.Validated;
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 com.ruoyi.order.dto.PlaceOrderRequest;
import com.ruoyi.order.service.OrderService;
@RestController
@RequestMapping("/order")
public class OrderController {
@Autowired
private OrderService orderService;
@PostMapping("/placeOrder")
public R placeOrder(@Validated @RequestBody PlaceOrderRequest request) {
orderService.placeOrder(request);
return R.ok("下单成功");
}
@PostMapping("/test1")
public R test1() {
// 商品单价10元，库存20个,用户余额50元，模拟一次性购买22个。 期望异常回滚
orderService.placeOrder(new PlaceOrderRequest(1L, 1L, 22));
return R.ok("下单成功");
}
@PostMapping("/test2")
public R test2() {
// 商品单价10元，库存20个，用户余额50元，模拟一次性购买6个。 期望异常回滚
orderService.placeOrder(new PlaceOrderRequest(1L, 1L, 6));
return R.ok("下单成功");
}
}** PlaceOrderRequest.java**
java
package com.ruoyi.order.dto;
import lombok.Getter;
import lombok.Setter;
@Getter
@Setter
public class PlaceOrderRequest {
private Long userId;
private Long productId;
private Integer amount;
public PlaceOrderRequest() {
}
public PlaceOrderRequest(Long userId, Long productId, Integer amount) {
this.userId = userId;
this.productId = productId;
this.amount = amount;
}
}至此，订单服务就搭建好了。订单服务提供了下单接口，可以模拟正常下单，同时提供了验证库存不足及余额不足的接口，用于验证事务回滚。
测试验证
使用接口测试工具Postman或Apifox测试接口，注意观察运行日志，以及数据库数据变化，至此分布式事务集成案例全流程完毕。
正常下单
模拟正常下单，买一个商品 http://localhost:10301/order/placeOrder
json
{
"userId": 1,
"productId": 1,
"amount": 1
}库存不足
模拟库存不足，事务回滚 http://localhost:9201/order/placeOrder
json
{
"userId": 1,
"productId": 1,
"amount": 22
}用户余额不足
模拟用户余额不足，事务回滚 http://localhost:9201/order/placeOrder
{
"userId": 1,
"productId": 1,
"amount": 6
}结语
Seata AT模式是微服务场景下最常用的分布式事务解决方案之一，核心优势是对业务无侵入（仅需添加注解），底层基于「两阶段提交+自动补偿」实现数据一致性。AT模式的设计目标是：让开发者像使用本地事务一样使用分布式事务，无需手动编写回滚逻辑。其核心依赖「事务协调器（TC）、资源管理器（RM）、事务管理器（TM）」三大组件，以及「undo_log日志表、全局锁、本地锁」三大核心机制。在AT模式的两阶段提交中，第一阶段执行本地事务时，Seata会自动拦截业务SQL，生成包含数据旧值的undo_log并与业务数据一同提交至数据库；第二阶段若需回滚，框架则通过undo_log反向执行更新操作，完成数据恢复。
具体使用时只需将@GlobalTransactional注解添加在分布式事务的发起方方法上，Seata便会自动完成全局事务ID的生成、分支事务的注册与协调。使用时具体的注意事项包括：必须使用Seata数据源代理、必须创建undo_log表、所有微服务的tx-service-group、service.vgroupMapping需与Seata Server配置一致等。
技术探索之路漫漫，由于作者水平有限，文中难免有疏漏或不妥之处，若有不同见解或优化建议，欢迎留言交流指正。
参考资料
https://seata.apache.org/zh-cn/docs/user/quickstart
https://doc.ruoyi.vip/ruoyi-cloud/cloud/seata.html#基本介绍
https://xie.infoq.cn/article/37af299e60562cf625029c29e