【项目实战】Idea 零基础构建分布式架构项目

前言

以项目驱动学习，以实践检验真知

$\color{red}面向群体：学生、零基础、初学者，如果你是有经验开发者，请绕道，篇幅非常简单$
说一下写这篇文章的原因，最近准备写SpringCloud微服务技术、SpringSecurity微服务使用、Zookeeper代替Eureka方案的文章…
微服务相关的都会涉及到多个项目，每次都需要花费很大的篇幅去描述这些项目 ~ 创建、配置、结构。因此单独写一篇文章来记录项目创建的过程，后面有涉及项目创建的直接让读者来看这篇文章即可。

Maven 聚合

为什么要使用聚合？
将多个工程拆分为模块后，需要手动逐个安装到仓库后依赖才能够生效。修改源码后也需要逐个手动进行 clean 操作。而使用了聚合之后就可以批量进行 Maven 工程的安装、清理工作。
聚合本质

	<modules>
        <module>service_base</module>
        <module>spring_security</module>
    </modules>

【大白话解释项目聚合】
在分布式或微服务架构中，有非常多的模块（服务），如果说项目没有聚合的话，需要我们针对每个项目进行install安装到本地仓库，而且服务与服务之前是有依赖的，install的顺序是要求的。
例如：service-trade 引入 service-user的依赖，若先install service-trade会报service-user不存在，先安装service-user，而service-user中引入了service-account，因此install service-user也会报错，必须从最底层服务开始install
$\color{red} 真实经历，曾经接触过一个项目就是没有聚合的，从 download code到启动需要花一个一天的时间，非常恐怖$
$\color{red} 所以个人非常推荐一定要用这种聚合方式去创建项目。当然遇到这种聚合也不怕$

聚合体现
1）打包方式为：pom

 <packaging>pom</packaging>

2）有modules标签

<modules>
        <module>service_base</module>
        <module>spring_security</module>
    </modules>

举例：

<?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>acl_parent</artifactId>
        <groupId>dgut.xiaozheng</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>common</artifactId>
    <packaging>pom</packaging>
    <modules>
        <module>service_base</module>
        <module>spring_security</module>
    </modules>

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

$\color{red}【为什么要说这句话？教大家学习】$
一定要理解上面说的这个聚合体现 + 本质
做为零基础过来人，会这样的一个疑问？
这篇用的工具是idea，那么如果我用eclipse的话，如何聚合工程~在父工程中创建一个模块。万变不离本质，在eclipse中新建一个maven项目，然后在父项目中添加 packing标签和module标签指向新项目即可。
又如：SpirngBoot项目创建，可以用eclipse创建springboot项目，也可以创建maven项目，由maven项目去继承spring-boot-starter-parent，以及手动创建主启动类 + 主配置文件，也可以，
$\color{red}这就是你了解了本质之后，不管如何变化，都能知道怎么操作。工具只是便捷$

Maven 继承

$\color{red} 子项目使用父项目信息的机制，具体不展开说$

【项目实践一】构建聚合项目

下面要创建的项目结构
在这里插入图片描述
纯SpirngBoot方式：

创建父工程 cb_parent

File -> New -> Project
填写Group 和 Artifact
不断的next --> Finish即可
3. 修改pom
因为是父工程，用来聚合，因此将打包方式设置为：pom，并且删除其他不需要的信息

<packing>pom</packing>

在这里插入图片描述

<?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>2.4.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>csdn.xiaozheng.com</groupId>
    <artifactId>cb_parent</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>cb_parent</name>
    <description>Demo project for Spring Boot</description>
    <packaging>pom</packaging>
    <properties>
        <java.version>1.8</java.version>
    </properties>

</project>

这样我们的聚合工程就将好了
使用dependencyManagement管理依赖版本号，在父工程定义好版本号，然后子工程直接引入依赖，若没有指定版本，它会向上找父工程的版本
因此，总的pom为：

<?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>2.4.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>csdn.xiaozheng.com</groupId>
    <artifactId>cb_parent</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>cb_parent</name>
    <description>Demo project for Spring Boot</description>
    <packaging>pom</packaging>
    

    <properties>
        <java.version>1.8</java.version>
        <mybatis-plus.version>3.0.5</mybatis-plus.version>
        <velocity.version>2.0</velocity.version>
        <swagger.version>2.7.0</swagger.version>
        <jwt.version>0.7.0</jwt.version>
        <fastjson.version>1.2.28</fastjson.version>
        <gson.version>2.8.2</gson.version>
        <json.version>20170516</json.version>
        <cloud-alibaba.version>0.2.2.RELEASE</cloud-alibaba.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <!--Spring Cloud-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Hoxton.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${cloud-alibaba.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--mybatis-plus 持久层-->
            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus-boot-starter</artifactId>
                <version>${mybatis-plus.version}</version>
            </dependency>

            <!-- velocity 模板引擎, Mybatis Plus 代码生成器需要 -->
            <dependency>
                <groupId>org.apache.velocity</groupId>
                <artifactId>velocity-engine-core</artifactId>
                <version>${velocity.version}</version>
            </dependency>

            <dependency>
                <groupId>com.google.code.gson</groupId>
                <artifactId>gson</artifactId>
                <version>${gson.version}</version>
            </dependency>
            <!--swagger-->
            <dependency>
                <groupId>io.springfox</groupId>
                <artifactId>springfox-swagger2</artifactId>
                <version>${swagger.version}</version>
            </dependency>
            <!--swagger ui-->
            <dependency>
                <groupId>io.springfox</groupId>
                <artifactId>springfox-swagger-ui</artifactId>
                <version>${swagger.version}</version>
            </dependency>
            <!-- JWT -->
            <dependency>
                <groupId>io.jsonwebtoken</groupId>
                <artifactId>jjwt</artifactId>
                <version>${jwt.version}</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>${fastjson.version}</version>
            </dependency>
            <dependency>
                <groupId>org.json</groupId>
                <artifactId>json</artifactId>
                <version>${json.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

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

</project>

创建子聚合模块 cb_common

在父工程上右键-》new -》module
选择Maven模块

在这里插入图片描述
$\color{red}注意，这时你会发现：在父工程多了一个标签$

 <modules>
        <module>cb_common</module>
    </modules>

在这里插入图片描述

重复父工程的3和4
1）修改打包方式
2）由于聚合删除src
3）增加依赖，注意这里是dependencies

<?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>cb_parent</artifactId>
        <groupId>csdn.xiaozheng.com</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cb_common</artifactId>

    <packaging>pom</packaging>

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

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

        <!--lombok用来简化实体类：需要安装lombok插件-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <scope>provided </scope>
        </dependency>
        <!--swagger-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <scope>provided </scope>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <scope>provided </scope>
        </dependency>
        <!-- redis -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

        <!-- spring2.X集成redis所需common-pool2-->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-pool2</artifactId>
            <version>2.6.0</version>
        </dependency>
    </dependencies>
</project>

在这里插入图片描述

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创建子模块 cb_common_config

上述1~2同样的步骤
1）在cb_common项目右键–》New ->Module
2）输入模块命名空间
3）注意，这个模块不再是聚合，则是具体的工程，因此不能删除src
在这里插入图片描述

创建子模块 cb_common_dubbo

在cb_common中

   <modules>
        <module>cb_common_config</module>
        <module>cb_common_dubbo</module>
    </modules>

在这里插入图片描述

使用相同的方式创建cb_facade即可

小总结

$\color{red}经过上面的操作，我们已经初步学会了创建工程和聚合工程操作$
并且操作了三遍后应该掌握了一个项目的步骤
1）创建项目
2）修改pom
3）修改Yml
4）修改主启动类
5）业务类
6）测试

【项目实践二】快速构建微服务项目

$\color{red}为了方便，我直接在父工程做聚合，就不在像上述项目，先建父工程，然后个个聚合工程咯，偷个懒$
项目结构：
在这里插入图片描述

创建父工程cloud2020

<?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.atguigu.springcloud</groupId>
    <artifactId>cloud2020</artifactId>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>cloud-api-commons</module>
        <module>cloud-provider-payment8001</module>
        <module>cloud-consumer-order80</module>
        <module>cloud-eureka-server7001</module>
        <module>cloud-eureka-server7002</module>
        <module>cloud-provider-payment8003</module>
    </modules>
    <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modlue不用写groupId和version  -->
    <dependencyManagement>
        <dependencies>
            <!--spring boot 2.2.2-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.2.2.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--spring cloud Hoxton.SR1-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Hoxton.SR1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--spring cloud alibaba 2.1.0.RELEASE-->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2.1.0.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>${mybatis.spring.boot.version}</version>
            </dependency>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>${junit.version}</version>
            </dependency>
            <dependency>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>${log4j.version}</version>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${lombok.version}</version>
                <optional>true</optional>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <fork>true</fork>
                    <addResources>true</addResources>
                </configuration>
            </plugin>
        </plugins>
    </build>


</project>

【注意这里的配置】
packing 和 modules

 <modules>
        <module>cloud-api-commons</module>
        <module>cloud-provider-payment8001</module>
        <module>cloud-consumer-order80</module>
        <module>cloud-eureka-server7001</module>
        <module>cloud-eureka-server7002</module>
        <module>cloud-provider-payment8003</module>
    </modules>
    <packaging>pom</packaging>

这是我写的多个模块

<!-- 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modlue不用写groupId和version  -->
    <dependencyManagement>
        <dependencies>
            <!--spring boot 2.2.2-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.2.2.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--spring cloud Hoxton.SR1-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Hoxton.SR1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--spring cloud alibaba 2.1.0.RELEASE-->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2.1.0.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>${mybatis.spring.boot.version}</version>
            </dependency>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>${junit.version}</version>
            </dependency>
            <dependency>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>${log4j.version}</version>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${lombok.version}</version>
                <optional>true</optional>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <fork>true</fork>
                    <addResources>true</addResources>
                </configuration>
            </plugin>
        </plugins>
    </build>

父工程（也是聚合工程）创建完毕，具体步骤就不截图了，看上面

创建公共部分服务

创建module
修改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>cloud2020</artifactId>
        <groupId>com.atguigu.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-api-commons</artifactId>


    <dependencies>
        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
        <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>

        <!-- https://mvnrepository.com/artifact/cn.hutool/hutool-all -->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.1.0</version>
        </dependency>
    </dependencies>



</project>

在这里插入图片描述
3) 修改yml

由于是实体包，不需要任何配置，故无
4）修改主启动类
由于是实体包，不需要启动类，故无
5）修改主启动类
写入实体

package com.atguigu.springcloud.entities;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * @author xiaozheng
 * @version 1.0
 * @date 2020/12/13 12:54
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T> {
    
    
	private Integer code;
	private String message;
	private T data;

	public CommonResult(Integer code,String message){
    
    
		this(code,message,null);
	}

}

package com.atguigu.springcloud.entities;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * @author xiaozheng
 * @version 1.0
 * @date 2020/12/13 12:53
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Payment {
    
    
	private Long id;
	private String serial;
}

在这里插入图片描述

创建支付服务（生产者）

创建module
修改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>cloud2020</artifactId>
        <groupId>com.atguigu.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-provider-payment8001</artifactId>

    <dependencies>
        <!--依赖本地jar-->
        <dependency>
            <groupId>com.atguigu.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-jdbc -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

      
    </dependencies>


</project>

修改Yml

server:
  port: 8001


spring:
  application:
    name: cloud-payment-service
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: org.gjt.mm.mysql.Driver
    url: jdbc:mysql://localhost:3306/db2020?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: root

mybatis:
  mapperLocations: classpath:mapper/*.xml
  type-aliases-package: com.atguigu.springcloud.entities

在这里插入图片描述
4. 修改主启动类

package com.atguigu.springcloud;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;


/**
 * @author xiaozheng
 * @version 1.0
 * @date 2020/12/13 13:00
 */
@SpringBootApplication
@MapperScan("com.atguigu.springcloud.dao")
public class PaymentMain8001 {
    
    
	public static void main(String[] args) {
    
    
		SpringApplication.run(PaymentMain8001.class, args);
	}
}

在这里插入图片描述
5. 编写业务逻辑
1）准备sql

CREATE TABLE `payment` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'ID',
  `serial` varchar(200) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;

2）准备entities 在公共服务项目已经写好
3) 准备dao

package com.atguigu.springcloud.dao;

import com.atguigu.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

/**
 * @author xiaozheng
 * @version 1.0
 * @date 2020/12/13 13:10
 */
@Mapper
public interface PaymentDao {
    
    
	public int create(Payment payment);

	public Payment getPaymentById(@Param("id") Long id);
}

相对应Mapper

<?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.atguigu.springcloud.dao.PaymentDao">


    <insert id="create" parameterType="Payment" useGeneratedKeys="true" keyProperty="id">
            insert into payment(serial) values (#{serial});

    </insert>

    <resultMap id="BaseResultMap" type="com.atguigu.springcloud.entities.Payment">
        <id column="id" property="id" jdbcType="BIGINT"></id>
        <id column="serial" property="serial" jdbcType="VARCHAR"></id>
    </resultMap>

    <select id="getPaymentById"  parameterType="Long" resultMap="BaseResultMap">
            select * from payment where id=#{id}
    </select>


</mapper>

service 接口和实现类

package com.atguigu.springcloud.service;

import com.atguigu.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Param;

/**
 * @author xiaozheng
 * @version 1.0
 * @date 2020/12/13 13:09
 */
public interface PaymentService {
    
    
	//写
	public int create(Payment payment);

	//读取
	public Payment getPaymentById(@Param("id") Long id);

}

package com.atguigu.springcloud.service.impl;

import com.atguigu.springcloud.dao.PaymentDao;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.service.PaymentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @author xiaozheng
 * @version 1.0
 * @date 2020/12/13 13:09
 */
@Service
public class PaymentServiceImpl implements PaymentService {
    
    
	@Autowired
	private PaymentDao paymentDao;
	@Override
	public int create(Payment payment) {
    
    
		return paymentDao.create(payment);
	}

	@Override
	public Payment getPaymentById(Long id) {
    
    
		return paymentDao.getPaymentById(id);
	}
}

5）controller

package com.atguigu.springcloud.controller;

import com.alibaba.druid.support.json.JSONUtils;
import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;

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.RequestBody;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.sql.SQLOutput;
import java.util.List;

/**
 * @author xiaozheng
 * @version 1.0
 * @date 2020/12/13 13:15
 */
@RestController
@Slf4j
public class PaymentController {
    
    

	@Resource
	private PaymentService paymentService;

	@Value("${server.port}")
	private String serverPort;


	/*@Resource
	private DiscoveryClient discoveryClient;*/

	@PostMapping(value = "/payment/create")
	public CommonResult create(@RequestBody Payment payment){
    
    
		int result = paymentService.create(payment);
		log.info("*****插入结果："+result + "打印输出");

		if (result>0){
    
    
			//成功
			return new CommonResult(200,"插入数据库成功, 项目启动端口: " + serverPort ,result);
		}else {
    
    
			return new CommonResult(444,"插入数据库失败",null);
		}
	}
	@GetMapping(value = "/payment/get/{id}")
	public CommonResult getPaymentById(@PathVariable("id") Long id){
    
    
		Payment payment = paymentService.getPaymentById(id);
		log.info("*****查询结果："+payment + ";小郑开发....小郑修改测试自动启动...");
		if (payment!=null){
    
    
			//说明有数据，能查询成功
			return new CommonResult(200,"查询成功, 项目启动端口: " + serverPort, payment);
		}else {
    
    
			return new CommonResult(444,"没有对应记录，查询ID："+id,null);
		}
	}


}

在这里插入图片描述
6. 测试

在这里插入图片描述

创建订单服务（消费）

$\color{red}步骤是一样的，为了给大家加深印象，重复写一遍$

创建项目
修改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>cloud2020</artifactId>
        <groupId>com.atguigu.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-consumer-order80</artifactId>

    <dependencies>

        <!--依赖本地jar-->
        <dependency>
            <groupId>com.atguigu.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>


        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web  -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

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

</project>

修改Yml

server:
  port: 80

spring:
  application:
    name: cloud-order-service

修改主启动类

package com.ayguigu.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @author xiaozheng
 * @version 1.0
 * @date 2020/12/13 14:27
 */
@SpringBootApplication
public class OrderMain80 {
    
    
	public static void main(String[] args) {
    
    
		SpringApplication.run(OrderMain80.class, args);
	}
}

业务类

package com.ayguigu.springcloud.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

/**
 * @author xiaozheng
 * @version 1.0
 * @date 2020/12/13 14:29
 */
@Configuration
public class ApplicationContentConfig {
    
    
	@Bean
	public RestTemplate getRestTemplate(){
    
    
		return new RestTemplate();
	}

}

package com.ayguigu.springcloud.controller;

import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.springcloud.entities.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
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 org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

/**
 * @author xiaozheng
 * @version 1.0
 * @date 2020/12/13 14:29
 */
@RestController
@Slf4j
public class OrderController {
    
    
	 public static final String PAYMENT_URL = "http://localhost:8001";

	@Resource
	private RestTemplate restTemplate;

	@Value("${server.port}")
	private String serverPort;

	@PostMapping("/consumer/payment/create")
	public CommonResult<Payment>  create(Payment payment){
    
    
		//写操作
		return restTemplate.postForObject(PAYMENT_URL+"/payment/create",payment, CommonResult.class);
	}

	@GetMapping("/consumer/payment/get/{id}")
	public CommonResult<Payment> getPayment(@PathVariable("id") Long id){
    
    
		return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
	}

}

在这里插入图片描述

测试

在这里插入图片描述

总结

经过上述操作，可以总结

1）创建项目
2）修改pom
3）修改Yml
4）修改主启动类
5）业务类
6）测试

按照上面的操作就可以了，希望对你有帮助！
$\color{red}授人以鱼不如授人以渔，知道的越多，不知道的越多，希望对你有帮助！$