Spring Cloud 零基础篇
前言
1.课程内容(SpringCloud+SpringCloud Alibaba)
2.技术要求
java 8 + maven + git、github + Nginx + RabbitMQ + SpringBoot 2.0
1.微服务架构零基础理论入门
1.1.微服务架构概述
-
什么是微服务
- Martin Fowler,Mar 2014:微服务架构是一种架构模式,它提倡将单一应用程序划分为一组小的服务,服务之间互相协调、互相配合,为用户提供最终价值。每个服务运行在其独立的进程中,服务与服务间采用轻量级的通信机制互相协作(通常是基于HTTP协议的RESTful API)。每个服务都围绕着具体业务进行构建,并且能够被独立的部署到生产环境、类生产环境等。另外,应当尽量避免统一的、集中式的服务管理机制,对具体的一个服务而言,应根据业务上下文,选择合适的语言、工具对其进行构建。
- Martin Fowler,Mar 2014:微服务架构是一种架构模式,它提倡将单一应用程序划分为一组小的服务,服务之间互相协调、互相配合,为用户提供最终价值。每个服务运行在其独立的进程中,服务与服务间采用轻量级的通信机制互相协作(通常是基于HTTP协议的RESTful API)。每个服务都围绕着具体业务进行构建,并且能够被独立的部署到生产环境、类生产环境等。另外,应当尽量避免统一的、集中式的服务管理机制,对具体的一个服务而言,应根据业务上下文,选择合适的语言、工具对其进行构建。
-
主题词01:95后数字化生活-落地维度
生活->技术:一个厂家提供还是多个厂家提供?一个厂家提供兼容性好,多个厂家提供要定义接口规范
-
主题词02:分布式微服务架构-落地维度
1.2.Spring Cloud简介
- 是什么?
SpringCloud=分布式微服务架构的一站式解决方案,是多种微服务架构落地技术的集合体,俗称微服务全家桶
猜猜SpringCloud这个大集合里有多少种技术?
SpringCloud俨然已成为微服务开发的主流技术栈,在国内开发者社区非常火爆。
“微”力十足,互联网大厂微服务架构案例
京东的:
阿里的:
京东物流的:
1.3.Spring Cloud技术栈
- 各技术栈功能介绍
- 总结
1.4.Spring Boot和Spring Cloud版本选型
1.Spring Cloud和Spring Boot版本对应关系:
- Spring Boot 与 Spring Cloud兼容性
2.使用的版本
- Spring Cloud: Hoxton.SR12
- Spring Boot: 2.3.12.RELEASE
- Spring Cloud Alibaba: 2.2.6.RELEASE
- JDK: 1.8
- Maven: 3.6及以上
- MySQL: 5.7及以上
1.5.Spring Cloud停更说明
- 停更不停用
- 被动修复bugs
- 不再接受合并请求
- 不再发布新版本
2.微服务架构编码构建
约定>配置>编码
首先,做一个最简单的“订单-支付模块”微服务(普通的Spring Boot工程),它将要慢慢的融入Spring Cloud H版、Spring Cloud Alibaba新技术,理论和动手相结合。
say say easy, do do hard!
2.1.IDEA新建project工作空间
2.1.1.搭建微服务cloud整体聚合父工程Project
a. New Project - maven工程 - create from archetype: maven-archetype-site
b. 聚合总父工程名字
c. Maven选版本
d. 工程名字
e. 字符编码 - Settings - File encoding
f. 注解生效激活 - Settings - Annotation Processors
g. Java编译版本选8
h. File Type过滤 - Settings - File Type
2.1.2.修改聚合父工程Project的pom.xml文件
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.neo.springcloud</groupId>
<artifactId>cloud2021</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<!-- 统一管理jar包版本 -->
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<junit.version>4.12</junit.version>
<log4j.version>1.2.17</log4j.version>
<lombok.version>1.16.18</lombok.version>
<mysql.version>5.1.47</mysql.version>
<druid.version>1.1.16</druid.version>
<mybatis.spring.boot.version>1.3.0</mybatis.spring.boot.version>
</properties>
<!-- 子模块继承之后,提供作用:锁定版本+子moudle不用写groupId和version -->
<dependencyManagement>
<dependencies>
<!-- spring boot 2.3.12 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.3.12.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!-- spring cloud Hoxton.SR12 -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Hoxton.SR12</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!-- spring cloud alibaba 2.2.6.RELEASE -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-alibaba-dependencies</artifactId>
<version>2.2.6.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>${druid.version}</version>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>${mybatis.spring.boot.version}</version>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<plugin>
<artifactId>maven-site-plugin</artifactId>
<version>3.7.1</version>
</plugin>
<plugin>
<artifactId>maven-project-info-reports-plugin</artifactId>
<version>3.0.0</version>
</plugin>
</plugins>
</pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-site-plugin</artifactId>
<configuration>
<locales>en,fr</locales>
</configuration>
</plugin>
</plugins>
</build>
<reporting>
<plugins>
<plugin>
<artifactId>maven-project-info-reports-plugin</artifactId>
</plugin>
</plugins>
</reporting>
</project>
2.1.3.Maven工程落地细节
1.Maven中的DependencyManagement和Dependencies的区别
dependencyManagement元素中指定的版本号。
例如在父项目里:
<dependencyManagement>
<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
...
</dependencies>
</dependencyManagement>
然后在子项目里就可以添加mysql-connector时可以不指定版本号,例如:
<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
</dependencies>
这样做的好处就是:如果有多个子项目都引用同一样依赖,则可以避免在每个使用的子项目里都声明一个版本号,这样当想升级或切换到另一个版本时,只需要在顶层父容器里更新,而不需要一个一个子项目的修改;另外如果某个子项目需要另外的一个版本,只需要声明version即可。
dependencyManagement里只是声明依赖,并不实现引入,因此子项目需要显示的声明需要用的依赖。
如果不在子项目中声明依赖,是不会从父项目中继承下来的;只是在子项目中写了该依赖项,并且没有指定具体版本,才会从父项目中继承该项,并且version和scope都读取自父pom;如果子项目中指定了版本号,那么会使用子项目中指定的jar版本。
2.Maven工程跳过单元测试
IDEA中点击“闪电”小按钮:
2.1.4.父工程执行mvn:install发布到Maven仓库方便子工程继承
2.2.Rest微服务工程构建
2.2.1.构建步骤
2.2.1.1.cloud-provider-payment8001微服务提供者支付Module模块
构建微服务模块:
- 建module
- 改POM
- 写YML
- 主启动
- 业务类
1.建完module后发现父pom.xml文件多了一个modules标签
2.改POM
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>cloud2021</artifactId>
<groupId>com.neo.springcloud</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-provider-payment8001</artifactId>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring-boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
<!-- mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- jdbc -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
</project>
3.写YML
server:
port: 8001
spring:
application:
name: cloud-payment-service
datasource:
type: com.alibaba.druid.pool.DruidDataSource # 当前数据源操作类型
driver-class-name: org.gjt.mm.mysql.Driver # mysql驱动包
url: jdbc:mysql://localhost:3306/db2021?useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: root
mybatis:
mapperLocations: classpath:mapper/*.xml
type-aliases-package: com.neo.springcloud.entities # 所有Entity别名类所在包
4.主启动
package com.neo.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* @ClassName: PaymentMain8001
* @Title: cloud2021
* @Package: com.neo.springcloud
* @Description:
* @Author: Kisen
* @Date: 2021/7/18 21:56
*/
@SpringBootApplication
public class PaymentMain8001 {
public static void main(String[] args) {
SpringApplication.run(PaymentMain8001.class, args);
}
}
5.编写业务类
controller、service、dao、mysql
1)建表sql
-- db2021.payment definition
CREATE TABLE `payment` (
`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'ID',
`serial` varchar(200) DEFAULT '',
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
2)定义Entity类和CommonResult类
package com.neo.springcloud.entities;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;
/**
* @ClassName: Payment
* @Title: cloud2021
* @Package: com.neo.springcloud.entities
* @Description:
* @Author: Kisen
* @Date: 2021/7/18 22:13
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Payment implements Serializable {
private Long id;
private String serial;
}
package com.neo.springcloud.entities;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
* @ClassName: CommonResult
* @Title: cloud2021
* @Package: com.neo.springcloud.entities
* @Description:
* @Author: Kisen
* @Date: 2021/7/18 22:16
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T> {
private Integer code;
private String message;
private T data;
}
3)定义dao接口
package com.neo.springcloud.dao;
import com.neo.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
/**
* @ClassName: PaymentDao
* @Title: cloud2021
* @Package: com.neo.springcloud.dao
* @Description:
* @Author: Kisen
* @Date: 2021/7/18 22:21
*/
@Mapper
public interface PaymentDao {
int create(Payment payment);
Payment getPaymentById(@Param("id") Long id);
}
mybatis的映射文件PaymentMapper.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.neo.springcloud.dao.PaymentDao">
<resultMap id="BaseResultMap" type="com.neo.springcloud.entities.Payment">
<id column="id" property="id" jdbcType="BIGINT"/>
<id column="serial" property="serial" jdbcType="VARCHAR"/>
</resultMap>
<insert id="create" parameterType="Payment" useGeneratedKeys="true" keyProperty="id">
insert into payment(serial)
values (#{serial})
</insert>
<select id="getPaymentById" parameterType="Long" resultMap="BaseResultMap">
select * from payment where id=#{id}
</select>
</mapper>
4)编写service类
接口类:
package com.neo.springcloud.service;
import com.neo.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Param;
/**
* @InterfaceName: PaymentService
* @Title: cloud2021
* @Package: com.neo.springcloud.service
* @Description:
* @Author: Kisen
* @Date: 2021/7/18 22:59
*/
public interface PaymentService {
public int create(Payment payment);
public Payment getPaymentById(@Param("id") Long id);
}
实现类:
package com.neo.springcloud.service.impl;
import com.neo.springcloud.dao.PaymentDao;
import com.neo.springcloud.entities.Payment;
import com.neo.springcloud.service.PaymentService;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
/**
* @ClassName: PaymentServiceImpl
* @Title: cloud2021
* @Package: com.neo.springcloud.service.impl
* @Description:
* @Author: Kisen
* @Date: 2021/7/18 23:00
*/
@Service
public class PaymentServiceImpl implements PaymentService {
@Resource
private PaymentDao paymentDao;
public int create(Payment payment) {
return paymentDao.create(payment);
}
public Payment getPaymentById(@Param("id") Long id) {
return paymentDao.getPaymentById(id);
}
}
5)编写controller类
package com.neo.springcloud.controller;
import com.neo.springcloud.entities.CommonResult;
import com.neo.springcloud.entities.Payment;
import com.neo.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
/**
* @ClassName: PaymentController
* @Title: cloud2021
* @Package: com.neo.springcloud.controller
* @Description:
* @Author: Kisen
* @Date: 2021/7/18 23:05
*/
@RestController
@Slf4j
public class PaymentController {
@Resource
private PaymentService paymentService;
@PostMapping(value = "/payment/create")
public CommonResult create(Payment payment) {
int result = paymentService.create(payment);
log.info("***插入结果:" + result);
if (result > 0) {
return new CommonResult(200, "插入数据库成功", result);
} else {
return new CommonResult(444, "插入数据库失败");
}
}
@GetMapping(value = "/payment/get/{id}")
public CommonResult getPaymentById(@PathVariable("id") Long id) {
Payment payment = paymentService.getPaymentById(id);
log.info("***插入结果:" + payment);
if (payment != null) {
return new CommonResult(200, "查询成功", payment);
} else {
return new CommonResult(444, "没有对应记录,查询ID:" + id);
}
}
}
6.启动PaymentMain8001类,测试
1). 使用postman工具模拟post,发送请求
2). IDEA中Run和Run DashBoard
通过修改IDEA的workspace.xml(项目路径.idea)的方式快速打开Run DashBoard窗口
在RunDashboard下面添加代码:
<component name="RunDashboard">
<option name="configurationTypes">
<set>
<option value="SpringBootApplicationConfigurationType" />
</set>
</option>
</component>
2.2.1.2.热部署Devtools
1.添加devtools到项目
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
2.添加插件到聚合父类总工程的pom.xml
<build>
<finalName>cloud2021</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<fork>true</fork>
<addResources>true</addResources>
</configuration>
</plugin>
</plugins>
<build
3.开启自动构建
Settings>Compiler>勾选:
4.更新值
按ctrl+shift+alt+/
键>Registry>勾选:
5.重启IDEA
2.2.1.3.cloud-consumer-order80微服务消费者订单Module模块
1.建cloud-consumer-order80
2.改POM
a. 继承父工程,pom文件中的g(groupId)和v(version)可以不用写
b. spring-boot-starter-web、spring-boot-starter-actuator是标配,必须要有
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>cloud2021</artifactId>
<groupId>com.neo.springcloud</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-consumer-order80</artifactId>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
</project>
3.写YML
a. 新建application.yml文件
server:
port: 80
4.主启动
a. 新建主启动类OrderMain80
package com.neo.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* @ClassName: OrderMain80
* @Title: cloud2021
* @Package: com.neo.springcloud
* @Description:
* @Author: Kisen
* @Date: 2021/7/20 23:34
*/
@SpringBootApplication
public class OrderMain80 {
public static void main(String[] args) {
SpringApplication.run(OrderMain80.class, args);
}
}
5.业务类
a. Order客户端应该只有Controller,没有Service、Dao,直接调用Payment服务端,就像我们直接调用腾讯、阿里的开放API
b. 拷贝Payment服务端entities实体类Payment、Json封装体CommonResult
c. 新建OrderController,两个服务之间调用最原始的阶段是httpClient,进化到现在使用restTemplate,它对httpClient进行了一层封装,实现了订单微服务和支付微服务之间的横向调用。
d. RestTemplate是什么?
RestTemplate提供了多种便捷访问远程HTTP服务的方法,是一种简单便捷的访问restful服务模板类,是Spring提供的用于访问Rest服务的客户端模板工具类
官网地址:https://docs.spring.io/spring-framework/docs/5.2.9.RELEASE/javadoc-api/org/springframework/web/client/RestTemplate.html
使用:
使用restTemplate访问restful接口非常的简单粗暴无脑。(url, requestMap, ResponseBean.class)这个三个参数分别代表REST请求地址、请求参数、HTTP响应被转换成的对象类型。
f. 要使用RestTemplate,需要将其注入到Spring容器中
新增配置类,注入RestTemplate:
package com.neo.springcloud.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;
/**
* @ClassName: ApplicationContextConfig
* @Title: cloud2021
* @Package: com.neo.springcloud.config
* @Description:
* @Author: Kisen
* @Date: 2021/7/21 0:08
*/
@Configuration
public class ApplicationContextConfig {
@Bean
public RestTemplate getRestTemplate() {
return new RestTemplate();
}
}
g. 订单微服务Controller层使用restTemplate调用支付微服务
package com.neo.springcloud.controller;
import com.neo.springcloud.entities.CommonResult;
import com.neo.springcloud.entities.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import javax.annotation.Resource;
/**
* @ClassName: OrderController
* @Title: cloud2021
* @Package: com.neo.springcloud.controller
* @Description:
* @Author: Kisen
* @Date: 2021/7/21 0:11
*/
@RestController
@Slf4j
public class OrderController {
public static final String PAYMENT_URL = "http://localhost:8001";
@Resource
private RestTemplate restTemplate;
@GetMapping("/consumer/payment/create")
public CommonResult create(Payment payment) {
return restTemplate.postForObject(PAYMENT_URL + "/payment/create", payment, CommonResult.class);
}
@GetMapping("/consumer/payment/get/{id}")
public CommonResult getPayment(@PathVariable("id") Long id) {
return restTemplate.getForObject(PAYMENT_URL + "/payment/get/" + id, CommonResult.class);
}
}
6.测试
a. 启动支付微服务、订单微服务
b. 访问支付微服务
1). 地址栏输入http://localhost/consumer/payment/get/2,查询支付信息
2). 地址栏输入http://localhost/consumer/payment/create?serial=ctuser,新建支付信息
返回信息显示插入数据库成功,但数据库插入了serial字段为NULL,原因是:支付微服务接口参数Payment没有添加@RequestBody注解
添加@RequestBody注解后,因为开启了devtools功能,支付微服务会自动热部署;重新访问新建支付信息URL,数据库插入成功!
2.2.1.4.工程重构
1.观察问题
从已有的支付微服务、订单微服务项目代码中不难发现,entities包下有重复的实体类Payment、CommonResult
于是,代码重复的部分我们可以将其抽取到公共的工程包,供大家统一调配使用
2.新建工程包cloud-api-commons
a. New Module
b. 修改pom.xml文件
添加如下依赖:
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<!-- Hutool是一个小而全的Java工具类库,通过静态方法封装,降低相关API的学习成本,提高工作效率,使Java拥有函数式语言般的优雅,让Java语言也可以“甜甜的”。 -->
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.7.2</version>
</dependency>
</dependencies>
3.拷贝Payment实体、CommonResult通用封装类到工程目录com.neo.springcloud.entities
4.将Maven打包发布上传到公用库,供其它工程调用
执行mvn clean、mvn install命令
5.分别改造订单微服务、支付微服务
1). 删除各自原先有的entities文件夹
2). pom.xml文件中各自引入cloud-api-commons通用包
<!-- 引入自己定义的api通用包,可以使用Payment支付Entity -->
<dependency>
<groupId>com.neo.springcloud</groupId>
<artifactId>cloud-api-commons</artifactId>
<version>${project.version}</version>
</dependency>
3). 启动项目测试
2.2.1.5.目前工程样图
本文来自博客园,作者:冰枫丶,转载请注明原文链接:https://www.cnblogs.com/lqsblog/p/15023009.html