02. SpringCloud介绍

其他 2020-02-27 20:33:31 阅读次数: 0

什么是SpringCloud?

快速开发分布式应用的工具集

https://spring.io/projects/spring-cloud

Spring Cloud focuses on providing good out of box experience for typical use cases and extensibility mechanism to cover others.

  • Distributed/versioned configuration 分布式/版本化的配置管理
  • Service registration and discovery 服务注册与服务发现
  • Routing 路由
  • Service-to-service calls 端到端调用
  • Load balancing 负载均衡
  • Circuit Breakers 断路器
  • Global locks 全局锁
  • Leadership election and cluster state 选举与集群状态管理
  • Distributed messaging 分布式消息
    在这里插入图片描述
    在这里插入图片描述
版本与兼容性
Spring Cloud版本命名

在这里插入图片描述

SNAPSHOT（开发版本）->Mx（里程碑版本）->RELEASE（正式版）->SRx（正式版本bug修复版本）

Spring Cloud版本生命周期

版本发布计划：

https://github.com/spring-cloud/spring-cloud-release/milestones
image-20200215163809591.png
版本发布记录：

https://github.com/spring-cloud/spring-cloud-release/releases
在这里插入图片描述
版本终止声明

https://spring.io/projects/spring-cloud
在这里插入图片描述

Spring Boot与Spring Cloud兼容性映射关系
Release Train Boot Version
Hoxton 2.2.x
Greenwich 2.1.x
Finchley 2.0.x
Edgware 1.5.x
Dalston 1.5.x
生产环境如何选择版本

  1. 坚决不使用非稳定版本/end-of-life版本

  2. 尽量使用最新一代

    xxx.RELEASE版本可以观望/调研一下

    SR2之后一般可大规模使用

整合SpringCloud

版本选择

  1. Spring Cloud Hoxton SR1
  2. Spring Boot 2.2.2.RELEASE
修改ms-user的pom文件：
  1. 增加spring-cloud-dependencies
  2. 增加仓库配置
  3. 修改spring-boot版本为2.2.2.RELEASE
<?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>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.2.2.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.cloud</groupId>
	<artifactId>ms-user</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>ms-user</name>
	<description>Demo project for Spring Boot</description>
	<properties>
		<java.version>1.8</java.version>
	</properties>
	<dependencies>
		<!-- 如果xxx是springboot出品 spring-boot-starter-xxx -->
		<!-- 如果xxx是第三方出品 xxx-spring-boot-starter -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Hoxton.SR1</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

	<repositories>
		<repository>
			<id>spring-snapshots</id>
			<name>Spring Snapshots</name>
			<url>https://repo.spring.io/libs-snapshot</url>
			<snapshots>
				<enabled>true</enabled>
			</snapshots>
		</repository>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/libs-milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
		<repository>
			<id>spring-releases</id>
			<name>Spring Releases</name>
			<url>https://repo.spring.io/libs-release</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
	</repositories>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>
修改ms-class的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 http://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>2.2.2.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.cloud</groupId>
	<artifactId>ms-class</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>ms-class</name>
	<description>Demo project for Spring Boot</description>
	<properties>
		<java.version>1.8</java.version>
	</properties>
	<dependencies>
		<!-- 如果xxx是springboot出品 spring-boot-starter-xxx -->
		<!-- 如果xxx是第三方出品 xxx-spring-boot-starter -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>
	
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Hoxton.SR1</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

	<repositories>
		<repository>
			<id>spring-snapshots</id>
			<name>Spring Snapshots</name>
			<url>https://repo.spring.io/libs-snapshot</url>
			<snapshots>
				<enabled>true</enabled>
			</snapshots>
		</repository>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/libs-milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
		<repository>
			<id>spring-releases</id>
			<name>Spring Releases</name>
			<url>https://repo.spring.io/libs-release</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
	</repositories>
	
	
	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>
进行install操作
启动用户微服务和课程微服务
http://localhost:8010/lesssons/buy/1

{"id":1,"title":"SpringCloud视频教程","cover":"xxx","price":5,"description":"SpringCloud视频教程","createTime":"2020-02-15T15:50:35.000+0000","videoUrl":"https://ke.qq.com/classroom/index.html"}
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