【Springcloud篇】学习笔记一（一至三章）：微服务介绍、构建环境

零基础微服务架构理论入门介绍

一个基于分布式的服务架构应该含有的架构内容如下：

1.1SpringCloud是什么

1.2基于微服务的系统

1.3服务与之对用的技术

1.4课程目录

第一章_SpringBoot和SpringCloud版本选择

详细可见SpringCloud2020.mmap文件

1.概述

2.SpringBoot版本选择

git源码地址：https://github.com/spring-projects/spring-boot/releases/
SpringBoot2.0新特性：https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.0-Release-Notes

通过上面官网发现，Boot官方强烈建议你升级到2.X以上版本

3.SpringCloud版本选择

git源码地址：https://github.com/spring-projects/spring-cloud
官网：https://spring.io/projects/spring-cloud
Cloud版本命名规则：A-Z（目前2023年9月4日，官网更新至）

4.SpringBoot和SpringCloud之间的版本对应关系

4.1初略的版本对应关系

链接：https://spring.io/projects/spring-cloud#overview
结果：SpringCloud版本至少为G

4.2更详细的版本对应关系

链接：https://start.spring.io/actuator/info
视频查的结果：

今日查的结果：

5.SpringCloud学习中各种技术版本

根据SpringCloud版本选择SpringBoot版本

6.SpringBoot中2.X版本常用的pom

第二章_关于Cloud组件的升级

其中sentienl为阿里巴巴开发的服务熔断技术

1.参考资料

SpringCloud的Hoxton SR1版本文档

https://cloud.spring.io/spring-cloud-static/Hoxton.SR1/reference/htmlsingle/

SpringCloud的中文文档

https://www.bookstack.cn/read/spring-cloud-docs/docs-index.md

第三章_新建工程

1.父工程project空间新建

maven版本以及工作环境

外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传

允许注解生效

2.父工程pom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.peng.springcloud</groupId><artifactId>cloud2020</artifactId><version>1.0-SNAPSHOT</version><!-- 使用maven分模块管理，有一个父级项目，父级项目中packaging(打包类型)为pom默认属性为jar，则maven会将项目打成jar包--><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><lombok.version>1.2.17</lombok.version><log4j.version>1.16.18</log4j.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，即子模块不用谢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 阿里巴巴--><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><!--mysql--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>${mysql.version}</version><scope>runtime</scope></dependency><!-- druid--><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>${druid.version}</version></dependency><!--mybatis--><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>${mybatis.spring.boot.version}</version></dependency><!--junit--><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>${junit.version}</version></dependency><!--log4j--><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>${log4j.version}</version></dependency></dependencies></dependencyManagement>
</project>

3.DependencyManagement和Dependencies的区别

演示：

4.支付模块构建

前说：由订单模块启动支付模块

4.1套路

建module
改POM
写YML
主启动
业务类

4.2过程

（1）建module：cloud-provider-payment8001

直接new Module即可

（2）改POM

补充maven爆红解决方法

<?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.peng.springcloud</groupId><version>1.0-SNAPSHOT</version></parent><modelVersion>4.0.0</modelVersion><artifactId>cloud-provider-payment8001-2</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></dependency></dependencies></project>

（3）写YML

<?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.peng.springcloud</groupId><version>1.0-SNAPSHOT</version></parent><modelVersion>4.0.0</modelVersion><artifactId>cloud-provider-payment8001-2</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></dependency></dependencies></project>

（4）主启动

（5）业务类

①建表

CREATE TABLE `payment` ( `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'ID', `serial` varchar(200) DEFAULT '', PRIMARY KEY (`id`)) 
ENGINE=InnoDB 
AUTO_INCREMENT=1 
DEFAULT CHARSET=utf8

②entites实体类

payment类

返回的json字符串

③dao层

接口PaymentDao

mybaits的映射文件PaymentMapper.xml

④service层

⑤controller层

4.3.开启热部署

（1）引入jar包-子工程

<dependency>  		<groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId><scope>runtime</scope><optional>true</optional>
</dependency>

（2）添加插件-父工程

<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>