1.nacos搭建

参考官网 https://nacos.io/zh-cn/docs/quick-start-docker.html

下载代码-》mysql执行脚本-》修改 env目录下mysql连接信息-》启动容器docker-compose -f example/standalone-mysql-8.yaml up

2.seata搭建

这个更简单，但是需要多注意

参考官网 https://seata.io/zh-cn/docs/ops/deploy-by-docker.html

2.1先起起来

docker run --privileged -e SEATA_IP="192.168.56.101" -d -p 8091:8091 -p 7091:7091   --name stack-seata seataio/seata-server:1.5.0

2.2把配置文件复制下来

docker cp seata-serve:/seata-server/resources /home/server/stack/seata/config/

2.3修改application.yml配置如下

server:
  port: 7091

spring:
  application:
    name: seata-server

logging:
  config: classpath:logback-spring.xml
  file:
    path: ${user.home}/logs/seata
  extend:
    logstash-appender:
      destination: 127.0.0.1:4560
    kafka-appender:
      bootstrap-servers: 127.0.0.1:9092
      topic: logback_to_logstash

console:
  user:
    username: seata
    password: seata

seata:
  config:
    # support: nacos, consul, apollo, zk, etcd3
    #type: file
    type: nacos
    nacos:
      server-addr: 192.168.56.101:8848
      namespace:
      group: SEATA_GROUP
      username: nacos
      password: nacos
      data-id: seataServer.properties
  registry:
    # support: nacos, eureka, redis, zk, consul, etcd3, sofa
    #type: file
    type: nacos
    nacos:
      application: seata-server
      server-addr: 192.168.56.101:8848
      ip: 192.168.56.101
      group: SEATA_GROUP
      namespace:
      cluster: default
      username: nacos
      password: nacos
  store:
    # support: file 、 db 、 redis
    mode: db
    db:
      datasource: druid
      db-type: mysql
      driver-class-name: com.mysql.cj.jdbc.Driver
      url: jdbc:mysql://192.168.56.101:3306/stack_study?useSSL=false&useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true
      user: root
      password: 123456
      min-conn: 5
      max-conn: 100
      global-table: global_table
      branch-table: branch_table
      lock-table: lock_table
      distributed-lock-table: distributed_lock
      query-limit: 100
      max-wait: 5000
#  server:
#    service-port: 8091 #If not configured, the default is '${server.port} + 1000'
  security:
    secretKey: SeataSecretKey0c382ef121d778043159209298fd40bf3850a017
    tokenValidityInMilliseconds: 1800000
    ignore:
      urls: /,/**/*.css,/**/*.js,/**/*.html,/**/*.map,/**/*.svg,/**/*.png,/**/*.ico,/console-fe/public/**,/api/v1/auth/login

主要是改nacos和db的配置，完整的配置在application.example.yml

2.4初始化数据库，在这里下载脚本https://github.com/seata/seata/tree/develop/script/server/db

2.5在nacos创建配置文件seataServer.properties，内容是https://github.com/seata/seata/tree/develop/script/config-center里面的config.txt

注意这里面的配置service.vgroupMapping.xxx_default_group=default要记住，要server和client一致

2.6再起起来

docker run --privileged -e SEATA_IP="192.168.56.101" -d -p 8091:8091 -p 7091:7091 -v /home/server/stack/seata/config/resources:/seata-server/resources  --name stack-seata seataio/seata-server:1.5.0

3.项目中使用（订单项目和库存项目）

3.1库存项目

pom.xml

        <!-- 要移除seata核心，保持和server 端一致这样才会配置一致可用 -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>io.seata</groupId>
                    <artifactId>seata-spring-boot-starter</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-spring-boot-starter</artifactId>
            <version>1.5.0</version>
        </dependency>

一定要注意，否则读不到seataServer.properties

bootstrap.yml

seata:
  enabled: true
  # 是否自动开启数据源代理
  enable-auto-data-source-proxy: true
  tx-service-group: stack_default_group
  # 数据源代理模式，使用AT模式
  data-source-proxy-mode: AT
  config:
    type: nacos
    nacos:
      server-addr: 192.168.56.101:8848
      group: SEATA_GROUP
      namespace:
      dataId: seataServer.properties
      username: nacos
      password: nacos
  registry:
    type: nacos
    nacos:
      application: seata-server
      server-addr: 192.168.56.101:8848
      group: SEATA_GROUP
      namespace:
      username: nacos
      password: nacos

一定要注意这个   tx-service-group: stack_default_group和seataServer.properties里面的service.vgroupMapping对应的。其他的配置保持和server端的一致。

代码

@GlobalLock
    @Transactional
    public Result seataTest(){
        TestData testData=new TestData();
        testData.setName("houyong data");
        testDataMapper.insert(testData);

        return Result.success();
    }

被调用端只需要@Transactional。加上@GlobalLock是保证，执行全局事务的时候，本地的事务不会操作到这个方法。保证正在运行的全局事务的原子性。这样比直接加@GlobalTransactional效率高很多。

3.2订单项目

订单项目的配置和库存项目都一样的

代码

@GlobalTransactional
    public Result seataTest(){
        TestData testData=new TestData();
        testData.setName("houyong study");
        testDataMapper.insert(testData);

        testDataFeign.addTestData();

        String a=null;
        a.trim();

        return Result.success();
    }

特意抛了个空指针异常，回滚成功

后台会输出：Branch Rollbacked result: PhaseTwo_Rollbacked