分布式事务系列--Seata AT(starter)

其他 2021-01-31 16:50:00 阅读次数: 0

其他网址

springboot+seata+mybatisplus+springcloudalibaba整合demo,动动手给个star呗
Seata部署指南

SpringCloud项目升级seata遇到的坑，并使用Docker安装新版seata服务端 | 码农家园

综述

本文测试Seata AT模式（使用新版本测试）。

业务场景：创建订单时，order微服务先预生成订单（订单状态为创建中），再调用storage的feign来减库存，再调用account的feign来减账户余额，最后将订单状态改为已完成。

所用技术栈：spring-cloud-starter-alibaba-seata:2.2.3.RELEASE、seata-spring-boot-starter:1.4.1、springboot:2.3.7.RELEASE、springcloud:Hoxton.SR9、mysql、mybatis-plus、eureka、gateway。

所用插件：lombok

配置方式：
    seata-server: file.conf, registry.conf
    业务微服务服务：application.yml
重大改变：
    引入Seata之后，如果不使用@GlobalTransactional而调用feign不会再报“xid must not be blank”错误 

所有代码：https://gitee.com/shapeless/demo_SpringCloud/tree/seata-at-2 

seata-server安装/配置

下载seata服务

https://github.com/seata/seata/releases

配置

本处使用mysql、eureka，未使用配置中心。

修改的文件：seata-server-1.4.0\seata\conf\     file.cof、registry.conf

file.conf   //配置事务的存储方式。改动点已经加粗。

## transaction log store, only used in seata-server
store {
  ## store mode: file、db、redis
  # mode = "file"
  mode = "db" #将事务信息存到数据库中。配置为"db"时，只有“db”节点下的配置有效，不用管“file”

  ## file store property
  file {
    ## store location dir
    dir = "sessionStore"
    # branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions
    maxBranchSessionSize = 16384
    # globe session size , if exceeded throws exceptions
    maxGlobalSessionSize = 512
    # file buffer size , if exceeded allocate new buffer
    fileWriteBufferCacheSize = 16384
    # when recover batch read size
    sessionReloadReadSize = 100
    # async, sync
    flushDiskMode = async
  }

  ## database store property
  db {
    ## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp)/HikariDataSource(hikari) etc.
    datasource = "druid"
    ## mysql/oracle/postgresql/h2/oceanbase etc.
    ## dbType = "mysql"
    ## driverClassName = "com.mysql.jdbc.Driver"
    ## url = "jdbc:mysql://127.0.0.1:3306/seata"
    ## user = "mysql"
    ## password = "mysql"
    driverClassName = "com.mysql.cj.jdbc.Driver" #使用mysql8.x驱动
    url: "jdbc:mysql://127.0.0.1:3306/demo?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=GMT%2B8" #指定服务器地址及数据库等
    user = "xxx"
    password = "xxx"
    minConn = 5
    maxConn = 100
    globalTable = "global_table"
    branchTable = "branch_table"
    lockTable = "lock_table"
    queryLimit = 100
    maxWait = 5000
  }

  ## redis store property
  redis {
    host = "127.0.0.1"
    port = "6379"
    password = ""
    database = "0"
    minConn = 1
    maxConn = 10
    maxTotal = 100
    queryLimit = 100
  }

}

registry.conf  //配置注册中心。改动点已经加粗。

registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  #type = "file"
  type = "eureka"
  
  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"
    serviceUrl = "http://localhost:7001/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 = "file"

  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"
  }
}

建库建表

创建数据库

创建名为demo的数据库。

seata服务事务表

这几张表用于seata-server存储事务。在上边file.conf指定的数据库里创建如下表：

//有人说这些语句在seata-server-xxx/conf/db_store.sql里。但我没找到，可能新的seata-server已经没有了。

-- -------------------------------- 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_gmt_modified_status` (`gmt_modified`, `status`),
    KEY `idx_transaction_id` (`transaction_id`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8;

-- 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 = utf8;

-- the table to store lock data
CREATE TABLE IF NOT EXISTS `lock_table`
(
    `row_key`        VARCHAR(128) NOT NULL,
    `xid`            VARCHAR(96),
    `transaction_id` BIGINT,
    `branch_id`      BIGINT       NOT NULL,
    `resource_id`    VARCHAR(256),
    `table_name`     VARCHAR(32),
    `pk`             VARCHAR(36),
    `gmt_create`     DATETIME,
    `gmt_modified`   DATETIME,
    PRIMARY KEY (`row_key`),
    KEY `idx_branch_id` (`branch_id`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8;

业务表

CREATE TABLE `t_order` (
  `id` bigint(11) NOT NULL AUTO_INCREMENT,
  `user_id` bigint(11) DEFAULT NULL COMMENT '用户id',
  `product_id` bigint(11) DEFAULT NULL COMMENT '产品id',
  `count` int(11) DEFAULT NULL COMMENT '数量',
  `money` decimal(11,0) DEFAULT NULL COMMENT '金额',
  `create_time` datetime(0) NULL DEFAULT NULL,
  `update_time` datetime(0) NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP(0),
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;

ALTER TABLE `t_order` ADD COLUMN `status` int(1) DEFAULT NULL COMMENT '订单状态：0：创建中；1：已完结' AFTER `money` ;

踩坑：其他教程表名是"order"，我用mybatis-plus时，会报错。因为，它插入数据时语句是：INSERT INTO order ...，表名没有用``包裹，而order是mysql关键字，所以报错。

CREATE TABLE `t_account` (
  `id` bigint(11) NOT NULL AUTO_INCREMENT COMMENT 'id',
  `user_id` bigint(11) DEFAULT NULL COMMENT '用户id',
  `total` decimal(10,0) DEFAULT NULL COMMENT '总额度',
  `used` decimal(10,0) DEFAULT NULL COMMENT '已用余额',
  `residue` decimal(10,0) DEFAULT '0' COMMENT '剩余可用额度',
  `create_time` datetime(0) NULL DEFAULT NULL,
  `update_time` datetime(0) NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP(0),
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

# INSERT INTO `seat-account`.`account` (`id`, `user_id`, `total`, `used`, `residue`) VALUES ('1', '1', '1000', '0', '100');
INSERT INTO `demo`.`t_account` (`id`, `user_id`, `total`, `used`, `residue`) VALUES ('1', '1', '1000', '0', '1000');
CREATE TABLE `t_storage` (
  `id` bigint(11) NOT NULL AUTO_INCREMENT,
  `product_id` bigint(11) DEFAULT NULL COMMENT '产品id',
  `total` int(11) DEFAULT NULL COMMENT '总库存',
  `used` int(11) DEFAULT NULL COMMENT '已用库存',
  `residue` int(11) DEFAULT NULL COMMENT '剩余库存',
  `create_time` datetime(0) NULL DEFAULT NULL,
  `update_time` datetime(0) NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP(0),
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

# INSERT INTO `seat-storage`.`storage` (`id`, `product_id`, `total`, `used`, `residue`) VALUES ('1', '1', '100', '0', '100');
INSERT INTO `demo`.`t_storage` (`id`, `product_id`, `total`, `used`, `residue`) VALUES ('1', '1', '100', '0', '100');

业务事务表 

 每个被调用的服务以及服务的调用方都需要用到 "undo_log"表用于事务的回滚。新版本只需创建一个这个表即可（如果是单个数据库，所有微服务共用这一个表；如果是多个数据库，需要每个数据库创建一个这个表）

-- for AT mode you must to init this sql for you business database. the seata server not need it.
CREATE TABLE IF NOT EXISTS `undo_log`
(
    `branch_id`     BIGINT(20)   NOT NULL COMMENT 'branch transaction id',
    `xid`           VARCHAR(100) NOT NULL COMMENT 'global transaction id',
    `context`       VARCHAR(128) NOT NULL COMMENT 'undo_log context,such as serialization',
    `rollback_info` LONGBLOB     NOT NULL COMMENT 'rollback info',
    `log_status`    INT(11)      NOT NULL COMMENT '0:normal status,1:defense status',
    `log_created`   DATETIME(6)  NOT NULL COMMENT 'create datetime',
    `log_modified`  DATETIME(6)  NOT NULL COMMENT 'modify datetime',
    UNIQUE KEY `ux_undo_log` (`xid`, `branch_id`)
) ENGINE = InnoDB
  AUTO_INCREMENT = 1
  DEFAULT CHARSET = utf8 COMMENT ='AT transaction mode undo table';

业务微服务配置Seata

order/storage/account

这三个微服务都用这种配置。只有一处是不同的：seata.application-id。

application.yml

seata:
  enabled: true
  application-id: order_seata
  tx-service-group: my_tx_group
  enable-auto-data-source-proxy: true
  service:
    vgroup-mapping:
      my_tx_group: default  # key与上面的tx-service-group的值对应
  registry:
    type: eureka
    eureka:
      application: default
      service-url: http://localhost:7001/eureka
      weight: 1
#  config:
#    type: nacos
#    nacos:
#      namespace:
#      serverAddr: 127.0.0.1:8848
#      group: SEATA_GROUP
#      username: "nacos"
#      password: "nacos"

业务主要代码

order

controller

package com.example.order.controller;

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

@RestController
@RequestMapping("/order")
public class OrderController {
    @Autowired
    OrderService orderService;

    //使用Seata
    @PostMapping("create")
    public String create(Order order) {
        orderService.create(order);
        return "success";
    }

    //不使用Seata的
    @PostMapping("createNoSeata")
    public String createNoSeata(Order order) {
        orderService.createNoSeata(order);
        return "success";
    }

    // 在另一个微服务里再调用feign
    @PostMapping("create2")
    public String create2(Order order) {
        orderService.create2(order);
        return "success";
    }
}

service

Service

package com.example.order.service;

import com.baomidou.mybatisplus.extension.service.IService;
import com.example.order.entity.Order;

public interface OrderService extends IService<Order> {
    void create(Order order);

    void createNoSeata(Order order);

    void create2(Order order);
}

ServiceImpl

package com.example.order.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.base.feign.AccountFeignClient;
import com.example.base.feign.StorageFeignClient;
import com.example.order.entity.Order;
import com.example.order.mapper.OrderMapper;
import com.example.order.service.OrderService;
import io.seata.spring.annotation.GlobalTransactional;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Slf4j
@Service
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Order> implements OrderService {
    @Autowired
    StorageFeignClient storageFeignClient;

    @Autowired
    AccountFeignClient accountFeignClient;

    //  AT模式
    @Override
    @GlobalTransactional(name = "my_tx_group",rollbackFor = Exception.class)
    public void create(Order order) {
        log.info("--创建订单开始 （创建并冻结）");
        order.setStatus(0);
        save(order);
        log.info("--创建订单结束（创建并冻结成功");

        log.info("--扣减库存开始");
        storageFeignClient.decreaseStorage(order.getProductId(), order.getCount());
        log.info("--扣减库存结束");

//        int i = 1/0;

        log.info("--扣减账户余额开始");
        accountFeignClient.decreaseMoney(order.getUserId(), order.getMoney());
        log.info("--扣减账户余额结束");

        this.getBaseMapper().updateStatus(order.getId(), 1);

//        int i = 1/0;
    }

    @Override
    @Transactional
    public void createNoSeata(Order order) {
        log.info("--创建订单开始 （创建并冻结）");
        order.setStatus(0);
        save(order);
        log.info("--创建订单结束（创建并冻结成功");

        log.info("--扣减库存开始");
        storageFeignClient.decreaseStorage(order.getProductId(), order.getCount());
        log.info("--扣减库存结束");

//        int i = 1/0;

        log.info("--扣减账户余额开始");
        accountFeignClient.decreaseMoney(order.getUserId(), order.getMoney());
        log.info("--扣减账户余额结束");

        this.getBaseMapper().updateStatus(order.getId(), 1);

//        int i = 1/0;
    }

    @Override
    @GlobalTransactional(name = "my_tx_group",rollbackFor = Exception.class)
    public void create2(Order order) {
        log.info("--创建订单开始 （创建并冻结）");
        order.setStatus(0);
        save(order);
        log.info("--创建订单结束（创建并冻结成功");

        log.info("--扣减库存和余额开始");
        storageFeignClient.decreaseStorageAndMoney(order.getProductId(), order.getCount(),
                order.getUserId(), order.getMoney());
        log.info("--扣减库存和余额结束");

        int i = 1/0;

        this.getBaseMapper().updateStatus(order.getId(), 1);

//        int i = 1/0;
    }
}

mapper

package com.example.order.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.example.order.entity.Order;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Update;
import org.springframework.stereotype.Repository;

@Repository
public interface OrderMapper extends BaseMapper<Order> {
    @Update("UPDATE `t_order` SET status = #{status} WHERE id = #{id}")
    int updateStatus(@Param("id") Long id, @Param("status") Integer status);
}

storage

controller

package com.example.storage.feign;

import com.example.storage.service.StorageService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.math.BigDecimal;

@RestController
public class FeignController {
    @Autowired
    StorageService storageService;

    @PostMapping("/feign/storage/decreaseStorage")
    public void decreaseStorage(@RequestParam("productId")Long productId, @RequestParam("count")Integer count) {
        storageService.decreaseStorage(productId, count);
    }

    @PostMapping("/feign/storage/decreaseStorageAndMoney")
    public void decreaseStorage(@RequestParam("productId")Long productId, @RequestParam("count")Integer count,
                                @RequestParam("userId")Long userId, @RequestParam("money") BigDecimal money) {
        storageService.decreaseStorageAndMoney(productId, count, userId, money);
    }
}

service

Service 

package com.example.storage.service;

import com.baomidou.mybatisplus.extension.service.IService;
import com.example.storage.entity.Storage;

import java.math.BigDecimal;

public interface StorageService extends IService<Storage> {
    void decreaseStorage(Long productId, Integer count);

    void decreaseStorageAndMoney(Long productId, Integer count, Long userId, BigDecimal money);
}

ServiceImpl

package com.example.storage.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.storage.entity.Storage;
import com.example.storage.mapper.StorageMapper;
import com.example.storage.service.StorageService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.example.base.feign.AccountFeignClient;

import java.math.BigDecimal;

@Service
@Slf4j
public class StorageServiceImpl extends ServiceImpl<StorageMapper, Storage> implements StorageService {
    @Autowired
    AccountFeignClient accountFeignClient;

    @Override
    public void decreaseStorage(Long productId, Integer count) {
//        int i = 1 / 0;
        getBaseMapper().decreaseStorage(productId, count);
    }

    @Override
    public void decreaseStorageAndMoney(Long productId, Integer count, Long userId, BigDecimal money) {
        getBaseMapper().decreaseStorage(productId, count);
        accountFeignClient.decreaseMoney(userId, money);
    }
}

mapper

package com.example.storage.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.example.storage.entity.Storage;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Update;
import org.springframework.stereotype.Repository;

@Repository
public interface StorageMapper extends BaseMapper<Storage> {
    @Update("UPDATE `t_storage` SET used= used + #{count}, residue = residue - #{count} WHERE product_id = #{productId}")
    int decreaseStorage(@Param("productId") Long productId, @Param("count") Integer count);
}

account

controller

package com.example.account.feign;

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

import java.math.BigDecimal;

@RestController
public class FeignController {
    @Autowired
    AccountService accountService;

    @PostMapping("/feign/account/decreaseMoney")
    public void decreaseMoney(@RequestParam("userId")Long userId, @RequestParam("money")BigDecimal money) {
        accountService.decreaseMoney(userId, money);
    }
}

service

Service 

package com.example.account.service;

import com.baomidou.mybatisplus.extension.service.IService;
import com.example.account.entity.Account;

import java.math.BigDecimal;

public interface AccountService extends IService<Account> {
    void decreaseMoney(Long userId, BigDecimal money);
}

ServiceImpl

package com.example.account.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.account.entity.Account;
import com.example.account.mapper.AccountMapper;
import com.example.account.service.AccountService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;

@Service
@Slf4j
public class AccountServiceImpl extends ServiceImpl<AccountMapper, Account> implements AccountService {
    @Override
    public void decreaseMoney(Long userId, BigDecimal money) {
        getBaseMapper().decreaseMoney(userId, money);
    }
}

mapper

package com.example.account.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.example.account.entity.Account;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Update;
import org.springframework.stereotype.Repository;
import org.springframework.web.bind.annotation.RequestParam;

import java.math.BigDecimal;

@Repository
public interface AccountMapper extends BaseMapper<Account> {
    @Update("UPDATE `t_account` SET residue = residue - #{money},used = used + #{money} where user_id = #{userId}")
    int decreaseMoney(@Param("userId")Long userId, @Param("money") BigDecimal money);
}

业务次要代码

base

通用应用注解

package com.example.base.config;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
import org.springframework.core.annotation.AliasFor;

import java.lang.annotation.*;

@Inherited
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@MapperScan("com.example.**.mapper")
@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients("com.example.base.feign")
public @interface BaseApplication {
    @AliasFor(annotation = SpringBootApplication.class)
    String[] scanBasePackages() default "com.example.**";

//    @AliasFor(annotation = SpringBootApplication.class)
//    Class<?>[] exclude() default {DataSourceAutoConfiguration.class};
}

mybatis-plus 自动填充插件

package com.example.base.config;

import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import org.apache.ibatis.reflection.MetaObject;
import org.mybatis.spring.annotation.MapperScan;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.time.LocalDateTime;

@Configuration
//@MapperScan("com.example.**.mapper")
public class MyBatisPlusConfig {
    private static final Logger logger = LoggerFactory.getLogger(MyBatisPlusConfig.class);

    //自动填充插件
    @Bean
    public MetaObjectHandler metaObjectHandler() {
        return new MybatisPlusAutoFillConfig();
    }

    public class MybatisPlusAutoFillConfig implements MetaObjectHandler {
        // 新增时填充
        @Override
        public void insertFill(MetaObject metaObject) {
            logger.info("插入：自动填充createTime和updateTime："+ LocalDateTime.now());
            setFieldValByName("createTime", LocalDateTime.now(), metaObject);
            setFieldValByName("updateTime", LocalDateTime.now(), metaObject);
        }

        // 修改时填充
        @Override
        public void updateFill(MetaObject metaObject) {
            logger.info("更新：自动填充updateTime:" + LocalDateTime.now());
            setFieldValByName("updateTime", LocalDateTime.now(), metaObject);
        }
    }
}

feign定义

package com.example.base.feign;

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

import java.math.BigDecimal;

@FeignClient("account")
public interface AccountFeignClient {
    @PostMapping("/feign/account/decreaseMoney")
    void decreaseMoney(@RequestParam("userId")Long userId, @RequestParam("money") BigDecimal money);
}

package com.example.base.feign;

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

import java.math.BigDecimal;

@FeignClient("storage")
public interface StorageFeignClient {
    @PostMapping("/feign/storage/decreaseStorage")
    void decreaseStorage(@RequestParam("productId") Long productId, @RequestParam("count") Integer count);

    @PostMapping("/feign/storage/decreaseStorageAndMoney")
    void decreaseStorageAndMoney(@RequestParam("productId") Long productId, @RequestParam("count") Integer count,
                         @RequestParam("userId") Long userId, @RequestParam("money")BigDecimal money);
}

pom.xml

<?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 https://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>2.1.12.RELEASE</version>-->
        <version>2.3.7.RELEASE</version>
    </parent>
    <packaging>pom</packaging>
    <groupId>com.example</groupId>
    <artifactId>base</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>base</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

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

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

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

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

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <!-- <version>8.0.21</version> 版本Spring-Boot-Parent中已带 -->
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.1</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
            <version>2.2.3.RELEASE</version>
            <exclusions>
                <exclusion>
                    <artifactId>seata-spring-boot-starter</artifactId>
                    <groupId>io.seata</groupId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-spring-boot-starter</artifactId>
            <version>1.4.1</version>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <!--  <version>Greenwich.SR3</version>-->
                <version>Hoxton.SR9</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>build-helper-maven-plugin</artifactId>
                <version>1.8</version>
                <executions>
                    <execution>
                        <id>add-source</id>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>add-source</goal>
                        </goals>
                        <configuration>
                            <sources>
                                <source>src/main/java</source>
                                <source>../base</source>
                                <!--  <source>../base/src/main/java</source>-->
                            </sources>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
<!--        <resources>-->
<!--            <resource>-->
<!--                <directory>src/main/resources</directory>-->
<!--                <includes>-->
<!--                    <include>**/*</include>-->
<!--                </includes>-->
<!--                <filtering>false</filtering>-->
<!--            </resource>-->
<!--            <resource>-->
<!--                <directory>../base/src/main/resources</directory>-->
<!--                <includes>-->
<!--                    <include>**/*</include>-->
<!--                </includes>-->
<!--                <filtering>false</filtering>-->
<!--            </resource>-->
<!--        </resources>-->
    </build>

</project>

eureka/gateway

eureka

启动类

package com.example.eurekaserver;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class EurekaServerApplication {

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

}

application.yml

server:
  port: 7001

spring:
  application:
    name: eureka-server

eureka:
  instance:
    hostname: localhost1
  client:
    register-with-eureka: false
    fetch-registry: false
    serviceUrl:
      defaultZone: http://localhost:7001/eureka/

pom.xml

<?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 https://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>2.0.6.RELEASE</version>-->
        <version>2.1.12.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>eureka-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>eureka-server</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
<!--                <version>Finchley.SR2</version>-->
                <version>Greenwich.SR6</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
</project>

gateway

启动类

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient
public class GatewayApplication {

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

}

application.yml

server:
  port: 6001

spring:
  application:
    name: gateway
  cloud:
    gateway:
      discovery:
        locator:
          enabled: true
          lower-case-service-id: true
      httpclient:
        ssl:
          use-insecure-trust-manager: true

eureka:
  client:
    service-url:
      defaultZone: http://localhost:7001/eureka/

# 配置Gateway日志等级，输出转发细节信息
logging:
  level:
    org.springframework.cloud.gateway: debug

pom.xml

<?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 https://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>2.1.12.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>gateway</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

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

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

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

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Greenwich.SR6</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

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

</project>

order/storage/account

说明：order/storage/account的次要代码都是一样的。只是改了唯一性的东西：spring.applicaion.name、端口号、pom.xml的artifactId以及name。

启动类

package com.example.order;

import com.example.base.config.BaseApplication;
import org.springframework.boot.SpringApplication;

@BaseApplication
public class OrderApplication {

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

}

application.yml

server:
  port: 9011

spring:
  application:
    name: order
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/demo?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=GMT%2B8
    username: root
    password: 222333

eureka:
  client:
    service-Url:
      defaultZone: http://localhost:7001/eureka
#      defaultZone: http://localhost:7001/eureka,http://localhost:7002/eureka

feign:
  hystrix:
    enabled: true

mybatis-plus:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

seata:
  enabled: true
  application-id: order_seata
  tx-service-group: my_tx_group
  enable-auto-data-source-proxy: true
  service:
    vgroup-mapping:
      my_tx_group: default  # key与上面的tx-service-group的值对应
  registry:
    type: eureka
    eureka:
      application: default
      service-url: http://localhost:7001/eureka
      weight: 1
#  config:
#    type: nacos
#    nacos:
#      namespace:
#      serverAddr: 127.0.0.1:8848
#      group: SEATA_GROUP
#      username: "nacos"
#      password: "nacos"

pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.example</groupId>
        <artifactId>base</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <relativePath>../base/pom.xml</relativePath>
    </parent>
    <artifactId>order</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>order</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
    </dependencies>

</project>

测试

启动注册中心，启动seata服务（运行seata-server-1.4.0\seata\bin\seata-server.bat），启动gateway，启动各个业务微服务。

访问：

http://localhost:6001/order/order/create?userId=1&productId=1&count=10&money=100

http://localhost:6001/order/order/createNoSeata?userId=1&productId=1&count=10&money=100

http://localhost:6001/order/order/create2?userId=1&productId=1&count=10&money=100

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