SpringCloudAlibaba整合Seata-526互联

Seata（全称为Simple Extensible Autonomous Transaction Architecture）是一个开源的分布式事务解决方案，用于解决分布式系统中的事务一致性问题。在分布式系统中，由于各个服务可能分布在不同的服务器上，涉及的数据库也可能不同，因此需要一种机制来保证分布式事务的原子性、一致性、隔离性和持久性（ACID特性）。
Seata 提供了一套完整的解决方案来支持分布式事务，主要包括以下核心功能：
全局事务管理： Seata 提供全局事务管理功能，允许用户在分布式环境下对多个参与者服务进行事务的管理。通过全局事务管理，Seata能够确保在跨多个服务的操作中，要么所有操作都提交成功，要么全部失败，从而保持数据的一致性。
分布式事务协调： Seata 使用一个协调器（Coordinator）来协调全局事务的各个参与者，确保它们按照统一的规则执行事务，最终提交或者回滚。
事务日志存储： Seata 使用可靠的存储来记录分布式事务的状态和日志信息，以便在故障发生时能够进行恢复和回滚。
高可用性： Seata 提供高可用的部署方式，支持多个协调器实例的集群部署，确保在某个协调器故障时仍能继续提供服务。
多种事务模式： Seata 支持 AT（自动型事务）模式和 TCC（Try-Confirm-Cancel）模式等多种事务模式，以适应不同场景下的需求。
总的来说，Seata旨在解决分布式事务的复杂性，使得开发人员能够更加方便地在分布式系统中实现事务管理，提供了更高的事务一致性和可靠性。

这里我只演示AT模式，因为是使用起来最简单的模式

首先我们需要去下载安装一下seata的服务中心：https://github.com/seata/seata/releases/tag/v1.6.1
注意这个版本要和一开始讲的springcloudalibaba版本一致（我们这里用的是seata1.6.1）
不记得可以回去看下版本说明完整springcloudalibaba项目搭建教程（新手入门）

我们将下载下来的压缩包上传到/usr/local目录下

然后直接解压

tar -zxvf seata-server-1.6.1.tar.gz
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为了实现seata的高可用，我们给它配置数据源为db的模式，也就是接入mysql，注意mysql版本需要5.7及以上
我们先去刚才解压的文件里面找到需要的sql文件，下载下来

cd /usr/local/seata/script/server/db
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新建一个数据库

运行刚才的sql文件

我们还需要用到nacos
我们新建一个命名空间

记住这个空间的id，下面要用

然后我们进入/usr/local/seata/conf/

cd /usr/local/seata/conf/
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修改里面的application.yml文件
记得把里面的nacos配置和mysql配置换成自己的

特别注意：

security:
secretKey: 88888888888888888888888888888888 # 这里要注意, csdn说我泄露隐私，所以这里不要改成这个啊！！！！！！！！！！！！！
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2
# Copyright 1999-2019 Seata.io Group.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

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: nacos
nacos:
server-addr: 192.168.43.128:8848
namespace: f6758f0e-1bbe-484f-9247-e9e6d1df5a25
group: SEATA_GROUP
username: nacos
password: nacos
registry:
# support: nacos, eureka, redis, zk, consul, etcd3, sofa
type: nacos
nacos:
application: seata-server
server-addr: 192.168.43.128:8848
group: SEATA_GROUP
namespace: f6758f0e-1bbe-484f-9247-e9e6d1df5a25
username: nacos
password: nacos
store:
# support: file 、 db 、 redis
mode: db
db:
datasource: druid
db-type: mysql
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://192.168.43.128:3306/seata?rewriteBatchedStatements=true
user: root
password: px123456
min-conn: 10
max-conn: 100
global-table: global_table
branch-table: branch_table
lock-table: lock_table
distributed-lock-table: distributed_lock
query-limit: 1000
max-wait: 5000
# server:
# service-port: 8091 #If not configured, the default is '${server.port} + 1000'
security:
secretKey: 88888888888888888888888888888888 # 这里要注意, csdn说我泄露隐私，所以这里不要改成这个啊！！！！！！！！！！！！！
tokenValidityInMilliseconds: 1800000
ignore:
urls: /,/**/*.css,/**/*.js,/**/*.html,/**/*.map,/**/*.svg,/**/*.png,/**/*.ico,/console-fe/public/**,/api/v1/auth/login

我们再找到/usr/local/seata/script/config-center/下的config.txt文件

主要还是修改里面store.db数据源配置

#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.
store.mode=file
store.lock.mode=file
store.session.mode=file
#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
store.db.url=jdbc:mysql://192.168.43.128:3306/seata?useUnicode=true&rewriteBatchedStatements=true
store.db.user=root
store.db.password=px123456
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.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.rollbackRetryTimeoutUnlockEnable=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

我们还需要将一些配置文件注入到nacos中

cd /usr/local/seata/script/config-center/nacos/
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用下面的命令执行里面nacos-config.sh

-h nacos的ip
-p nacos的端口
-t 刚才nacos空间id
-u nacos的登录用户
-w nacos的登录密码

sh nacos-config.sh -h 192.168.43.128 -p 8848 -g SEATA_GROUP -t f6758f0e-1bbe-484f-9247-e9e6d1df5a25 -u nacos -w nacos
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注意下面箭头两个地方，一个是提示too many arguments，这个是因为config.txt里有类似这种“store.publicKey=”，就是等于号后面是空的，不过不影响使用，有强迫症的可以把这种改成“ =“” ”，就是在后面加上英语双引号
下面那个init nacos config fail不用管，脚本到那里已经执行完了

我们去nacos看下刚创建的空间
可以看到文件都进去了

最后我们去启动seata
先进入/usr/local/seata/bin/目录

cd /usr/local/seata/bin/
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启动里面的脚本：sh seata-server.sh

启动成功后我们访问：http://192.168.43.128:7091/

密码账号都是seata
下面就是seata的控制台

seata服务搭建好我们就可以开始整合代码了
首先我们得先在项目里面接入数据库，内容有些多，我就直接按下面的项目目录一个个文件放上来，建议大家直接去githup上拉一下代码（https://github.com/PX1206/SpringCloudAlibaba）

我们先去父项目的pom里面指定引入mysql、mybatisplus以及druid连接池的版本

<?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>

<groupId>com.sakura.springcloud</groupId>
<artifactId>springcloudalibaba</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springcloudalibaba</name>
<description>springcloudalibaba</description>

<modules>
<module>order</module>
<module>stock</module>
<module>product</module>
</modules>

<properties>
<java.version>1.8</java.version>
<spring-boot.version>2.7.7</spring-boot.version>
<spring-cloud.version>2021.0.5</spring-cloud.version>
<spring-cloud-alibaba.version>2021.0.5.0</spring-cloud-alibaba.version>
<mysql.version>5.1.47</mysql.version>
<mybatis-plus.version>3.5.2</mybatis-plus.version>
<druid.version>1.2.11</druid.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>
</dependencies>

<dependencyManagement>
<dependencies>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>${spring-boot.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>

<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>

<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-alibaba-dependencies</artifactId>
<version>${spring-cloud-alibaba.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>

<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>${druid.version}</version>
</dependency>

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

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
</dependencies>
</dependencyManagement>

</project>

接着调整order服务

我们在数据库新建一个数据库order

然后新建一张order表

CREATE TABLE `t_order` (
`id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'id,自增',
`order_no` varchar(45) DEFAULT NULL COMMENT '订单号',
`product_no` varchar(45) DEFAULT NULL COMMENT '商品编号',
`num` int(11) DEFAULT NULL COMMENT '数量',
`total_price` int(11) DEFAULT NULL COMMENT '总价格，单位为分',
`create_dt` datetime DEFAULT CURRENT_TIMESTAMP COMMENT '创建日期',
`update_dt` datetime DEFAULT CURRENT_TIMESTAMP COMMENT '修改日期',
`status` int(11) DEFAULT '1' COMMENT '状态：1正常 0删除',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8 COMMENT='订单表';

先直接覆盖pom文件引入jar包

<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.sakura.springcloud</groupId>
<artifactId>springcloudalibaba</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>

<artifactId>order</artifactId>
<packaging>jar</packaging>

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

<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
</exclusion>
</exclusions>
</dependency>

<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>

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

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

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

<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
</dependency>

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>

<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>

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

<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
</dependency>

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

</dependencies>
</project>

然后在application.yml里面配置好相关配置信息

server:
port: 8020

logging:
level:
com.sakura.product.feign: debug # 这里我们可以单独配置feign的日志级别

spring:
profiles:
active: dev
datasource:
url: jdbc:mysql://192.168.43.128:3306/stock?useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: px123456
# 使用druid数据源
druid:
#2.连接池配置
#初始化连接池的连接数量大小，最小，最大
initial-size: 5
min-idle: 5
max-active: 20
#配置获取连接等待超时的时间
max-wait: 60000
#配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
time-between-eviction-runs-millis: 60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
min-evictable-idle-time-millis: 30000
validation-query: SELECT 1
test-while-idle: true
test-on-borrow: true
test-on-return: false
# 是否缓存preparedStatement，也就是PSCache 官方建议MySQL下建议关闭个人建议如果想用SQL防火墙建议打开
pool-prepared-statements: true
max-pool-prepared-statement-per-connection-size: 20
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
filter:
stat:
merge-sql: true
slow-sql-millis: 5000
cloud:
sentinel:
transport:
dashboard: 192.168.43.128:9100

mybatis-plus:
configuration:
map-underscore-to-camel-case: true # 虽然默认为 true ，但是还是显示去指定下。
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
global-config:
db-config:
id-type: AUTO
logic-delete-value: "Y" # 逻辑已删除值(默认为 Y)
logic-not-delete-value: "N" #逻辑未删除值(默认为 N)
mapper-locations: classpath*:mapper/*.xml
type-aliases-package: com.sakura.stock.entity

feign:
sentinel:
enabled: true # 开启openfeign中的sentinel
client:
config:
product-service:
logger-level: basic
connect-timeout: 5000 # 连接超时时间，默认2s
read-timeout: 6000 #请求处理超时时间，默认5s
request-interceptors:
- com.sakura.stock.interceptor.feign.CustomFeignInterceptor # 开启自定义拦截器

OrderController里面我新加了一个addOrder方法，之前测试的一些方法可以删掉也可以放着，我这里是为了照顾之前的模块就不删了

package com.sakura.order.controller;

import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.sakura.order.feign.ProductFeignService;
import com.sakura.order.feign.StockFeignService;
import com.sakura.order.param.AddOrderParam;
import com.sakura.order.service.OrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
* @author Sakura
* @date 2023/7/19 11:25
*/
@RestController
@RequestMapping("/order")
@RefreshScope
public class OrderController {

@Autowired
StockFeignService stockFeignService;
@Autowired
ProductFeignService productFeignService;

@Value("${user.name}")
private String userName;

@Value("${user.age}")
private String userAge;

@Value("${user.sex}")
private String userSex;

@Autowired
OrderService orderService;

@RequestMapping("/add")
public String add(){
System.out.println("下单成功");
String msg = stockFeignService.reduct();
String productMsg = productFeignService.get(1);
return userName + userAge + userSex + "下单成功" + msg + "-" + productMsg;
}

@RequestMapping("/get")
@SentinelResource(value = "get", blockHandler = "getBlockHandler")
public String get(){
return "获取订单成功";
}

// 流控方法必须和原方法类型一致参数一致
// 一定要加上BlockException
public String getBlockHandler(BlockException blockException){
// 我们可以在这个方法里面处理流控后的业务逻辑
return "get接口被流控";
}

@RequestMapping("/flow")
public String flow() throws Exception {
Thread.sleep(3000);
return "正常访问";
}

@RequestMapping("/addOrder")
public String addOrder(@RequestBody AddOrderParam addOrderParam){
return orderService.addOrder(addOrderParam);
}

}

下面这些其实都是逆向工程生成的

对应Order实体

package com.sakura.order.entify;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;

import java.util.Date;

/**
* @author Sakura
* @date 2023/7/28 15:13
*/
@Data
@Accessors(chain = true)
@EqualsAndHashCode(callSuper = true)
@TableName("t_order")
public class Order extends BaseEntity {

private static final long serialVersionUID = 1L;

/**
* 自增id
*/
@TableId(value = "id", type = IdType.AUTO)
private Long id;

/**
* 订单号
*/
private String orderNo;

/**
* 商品编号
*/
private String productNo;

/**
* 数量
*/
private Integer num;

/**
* 总价格
*/
private Integer totalPrice;

/**
* 创建日期
*/
private Date createDt;

/**
* 修改日期
*/
private Date updateDt;

/**
* 状态：1正常 0删除
*/
private Integer status;

}

还有它继承的BaseEntity

package com.sakura.order.entify;

import java.io.Serializable;

public abstract class BaseEntity implements Serializable{
private static final long serialVersionUID = -7176390653391227433L;

}

然后OrderMapper，这里因为用的mybatisplus，所以里面没有生成方法

package com.sakura.order.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.sakura.order.entify.Order;
import org.apache.ibatis.annotations.Mapper;

/**
* @author Sakura
* @date 2023/7/28 15:13
*/
@Mapper
public interface OrderMapper extends BaseMapper<Order> {

}

对应的OrderMapper.xml文件

<?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.sakura.order.mapper.OrderMapper">

</mapper>

再就是service里面的OrderService

package com.sakura.order.service;

import com.sakura.order.param.AddOrderParam;

/**
* @author Sakura
* @date 2023/7/28 16:18
*/
public interface OrderService {

String addOrder(AddOrderParam addOrderParam);
}

impl里面的OrderServiceImpl

package com.sakura.order.service.impl;

import com.sakura.order.entify.Order;
import com.sakura.order.feign.ProductFeignService;
import com.sakura.order.feign.StockFeignService;
import com.sakura.order.mapper.OrderMapper;
import com.sakura.order.param.AddOrderParam;
import com.sakura.order.service.OrderService;
import lombok.extern.java.Log;
import org.apache.http.client.utils.DateUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.Date;

/**
* @author Sakura
* @date 2023/7/28 16:18
*/
@Service
@Log
public class OrderServiceImpl implements OrderService {

@Autowired
OrderMapper orderMapper;
@Autowired
ProductFeignService productFeignService;
@Autowired
StockFeignService stockFeignService;

@Override
public String addOrder(AddOrderParam addOrderParam) {

// 先去查询商品库存信息
Integer num = stockFeignService.getProductNum(addOrderParam.getProductNo());
log.info("商品库存数量：" + num);
if (num == null || num < 1 || num < addOrderParam.getNum()) {
return "商品库存不足";
}
Order order = new Order();
// 根据当前日期加随机数生成一个订单号
order.setOrderNo(DateUtils.formatDate(new Date(), "yyyyMMddHHmmssSSS")
+ (int) ((Math.random() * 9 + 1) * 10000000));
order.setProductNo(addOrderParam.getProductNo());
order.setNum(addOrderParam.getNum());
// 去商品服务获取商品单价
Integer unitPrice = productFeignService.getUnitPrice(addOrderParam.getProductNo());
log.info("商品单价：" + unitPrice);
if (unitPrice == null || unitPrice < 0) {
return "商品价格异常";
}
order.setTotalPrice(addOrderParam.getNum() * unitPrice);
order.setStatus(1);
orderMapper.insert(order);

return "商品下单成功：" + order.getOrderNo() + " 库存：" + num + " 单价：" + unitPrice;
}
}

feign里面的ProductFeignService

package com.sakura.order.feign;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

/**
* @description: stock服务接口
* @author: Sakura
* @date: 2023/7/20 14:38
*/
@FeignClient(name = "product-service", path = "/product")
public interface ProductFeignService {

@RequestMapping("/get/{id}")
String get(@PathVariable("id") Integer id);

@GetMapping("/getUnitPrice/{productNo}")
Integer getUnitPrice(@PathVariable("productNo") String productNo);
}

StockFeignService

package com.sakura.order.feign;

/**
* @description: stock服务接口
* @author: Sakura
* @date: 2023/7/20 14:38
*/
@FeignClient(name = "stock-service", path = "/stock", fallback = StockFeignServiceFallback.class)
public interface StockFeignService {

@RequestMapping("/reduct")
String reduct();

@GetMapping("/getProductNum/{productNo}")
Integer getProductNum(@PathVariable("productNo") String productNo);
}

StockFeignServiceFallback

package com.sakura.order.feign;

import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.PathVariable;

/**
* @author Sakura
* @date 2023/7/27 17:30
*/
@Component
public class StockFeignServiceFallback implements StockFeignService {

@Override
public String reduct() {
// 我们可以在这里处理降级逻辑，比如记录日志或者发短信提示管理用户等
return "stock服务异常降级";
}

@Override
public Integer getProductNum(@PathVariable("productNo") String productNo) {
return 0;
}
}

一定要记得关闭interceptor里面的统一拦截器，因为里面有个修改url的

package com.sakura.order.interceptor.feign;

import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
* @author Sakura
* @date 2023/7/20 17:24
*/
public class CustomFeignInterceptor implements RequestInterceptor {
Logger logger = LoggerFactory.getLogger(this.getClass());

@Override
public void apply(RequestTemplate requestTemplate) {
logger.info("进入feign自定义拦截器");
// 我们可以在这里记录日志或者添加参数以及修改参数等
//requestTemplate.header("123", "123");
//requestTemplate.query("456", "456");
// 我们把参数从1改成5
//requestTemplate.uri("/get/5");
}
}

最后就是AddOrderParam请求参数

package com.sakura.order.param;

import com.sakura.order.entify.BaseEntity;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;

import javax.validation.constraints.Min;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;

/**
* 订单详情表
*
* @author Sakura
* @since 2022-08-30
*/
@Data
@Accessors(chain = true)
@EqualsAndHashCode(callSuper = true)
public class AddOrderParam extends BaseEntity {
private static final long serialVersionUID = 1L;

/**
* 商品编号
*/
@NotBlank(message = "商品编号不能为空")
private String productNo;

/**
* 数量
*/
@NotNull(message = "商品数量不能为空")
@Min(1)
private Integer num;

}

product服务也差不多
对了，product模块因为是之前复制过来的，包名搞错了，应该是com.sakura.product

新建一个product数据库

加一张product表

CREATE TABLE `t_product` (
`id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'id,自增',
`product_name` varchar(45) DEFAULT NULL COMMENT '商品名称',
`product_no` varchar(45) DEFAULT NULL COMMENT '商品编号',
`unit_price` int(11) DEFAULT NULL COMMENT '单价，单位为分',
`create_dt` datetime DEFAULT CURRENT_TIMESTAMP COMMENT '创建日期',
`update_dt` datetime DEFAULT CURRENT_TIMESTAMP COMMENT '修改日期',
`status` int(11) DEFAULT '1' COMMENT '状态：1正常 0删除',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8 COMMENT='商品表';

先调整pom文件

<artifactId>product</artifactId>
<packaging>jar</packaging>