《分布式事务》https://blog.csdn.net/u011060911/article/details/122210788上面的文章系统介绍了分布式事务相关的理论知识，本文则通过代码来展示如何在项目中来使用并落地。

目录

1.  启动 seata-server 

2. SpringCloud 整合 seata

3. 启动应用

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Seata 作为分布式事务的框架应用非常广泛，刚好最近公司的项目有用到，所以就写下本文以供参考。

下面就带大家亲手搭建基于 SpringBoot + SpringCloud + Nacos + Seata 这样一套框架。服务见关系图如下：

推荐大家用 Seata 1.4.2 版本，配置信息可以通过一个 dataId 在 nacos 上指定，省去了很多麻烦，并且不容易出错。

1.  启动 seata-server 

修改 /conf/registry.conf 文件

registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  type = "nacos"

  nacos {
    application = "seata-server"
    serverAddr = "127.0.0.1:8849"
    group = "SEATA_GROUP"
    namespace = "baeba154-3521-468d-b5de-8efb86cbf3d9"
    cluster = "default"
    username = "nacos"
    password = "nacos"
  }
  
}

config {
  # file、nacos 、apollo、zk、consul、etcd3
  type = "nacos"

  nacos {
    serverAddr = "127.0.0.1:8849"
    namespace = "baeba154-3521-468d-b5de-8efb86cbf3d9"
    group = "SEATA_GROUP"
    username = "nacos"
    password = "nacos"
    # 需要在nacos上配置 
    dataId = "seataServer.properties"
  }
}

在nacos上添加 seataServer.properties 配置,内容可以拷贝 github  根据自己的实际信息修改。

transport.type=TCP
transport.server=NIO
transport.heartbeat=true
transport.enableClientBatchSendRequest=true
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
# 事务组集群名:default
service.vgroupMapping.my_test_tx_group=default
service.vgroupMapping.order-service-group=default
service.vgroupMapping.storage-service-group=default
# 通过 service.集群名.grouplist 找到 TC 服务地址
service.default.grouplist=127.0.0.1:8091
service.enableDegrade=false
service.disableGlobalTransaction=false
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=false
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
store.mode=db
store.lock.mode=file
store.session.mode=file
store.db.datasource=druid
store.db.dbType=mysql
store.db.driverClassName=com.mysql.jdbc.Driver
store.db.url=jdbc:mysql://127.0.0.1:3307/seata?useUnicode=true&rewriteBatchedStatements=true
store.db.user=root
store.db.password=123456
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
server.recovery.committingRetryPeriod=1000
server.recovery.asynCommittingRetryPeriod=1000
server.recovery.rollbackingRetryPeriod=1000
server.recovery.timeoutRetryPeriod=1000
server.maxCommitRetryTimeout=-1
server.maxRollbackRetryTimeout=-1
server.rollbackRetryTimeoutUnlockEnable=false
server.distributedLockExpireTime=10000
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
log.exceptionRate=100
transport.serialization=seata
transport.compressor=none
metrics.enabled=false
metrics.registryType=compact
metrics.exporterList=prometheus
metrics.exporterPrometheusPort=9898
tcc.fence.logTableName=tcc_fence_log
tcc.fence.cleanPeriod=1h

启动 seata-server

./bin/seata-server.sh 

2. SpringCloud 整合 seata

注意依赖也需要使用1.4以上的，

        <dependency>
            <groupId>com.alibaba.nacos</groupId>
            <artifactId>nacos-client</artifactId>
            <version>1.2.0</version>
        </dependency>
        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-spring-boot-starter</artifactId>
            <version>1.4.2</version>
        </dependency>

应用配置：（这里指列出一个服务的，另一个类似）

logging:
  level:
    io:
      seata: debug
server:
  port: 9092
spring:
  application:
    name: storage-service
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8849
        username: nacos
        password: nacos
        namespace: baeba154-3521-468d-b5de-8efb86cbf3d9
        group: SEATA_GROUP
  datasource:
    druid:
      driverClassName: com.mysql.cj.jdbc.Driver
      password: 123456
      url: jdbc:mysql://localhost:3307/seata_storage?serverTimezone=Asia/Shanghai&characterEncoding=utf-8&characterSetResults=utf8&useSSL=true&allowMultiQueries=true
      username: root

seata:
  application-id: ${spring.application.name}
  # 这里的配置对应 seataServer.properties 中的 service.vgroupMapping.storage-service-group=default
  tx-service-group: storage-service-group
  enable-auto-data-source-proxy: false
  config:
    type: nacos
    nacos:
      server-addr: 127.0.0.1:8849
      username: nacos
      password: nacos
      namespace: baeba154-3521-468d-b5de-8efb86cbf3d9
      # 微服务必须在一个组，否则服务发现不了，但Seata-server 可以在不同的组中
      group: SEATA_GROUP
      dataId: "seataServer.properties"
  registry:
    type: nacos
    nacos:
      server-addr: 127.0.0.1:8849
      username: nacos
      password: nacos
      namespace: baeba154-3521-468d-b5de-8efb86cbf3d9
      # 微服务必须在一个组，否则服务发现不了，但Seata-server 可以在不同的组中
      group: SEATA_GROUP

3. 启动应用

   http://localhost:9091/order/placeOrder/rollback

   http://localhost:9091/order/placeOrder/commit

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