Spring Cloud Alibab简介及初始环境搭建

Spring Cloud Alibaba简介

Spring Cloud Alibaba provides a one-stop solution for distributed application development. It contains all the components required to develop distributed applications, making it easy for you to develop your applications using Spring Cloud. – 摘自官网

译文：Spring Cloud Alibaba是阿里巴巴为分布式应用开发提供一站式解决方案。它包含了开发分布式应用程序所需的所有组件，使您可以轻松地使用Spring Cloud开发应用程序。

Spring Cloud Alibaba组件

• Flow control and service degradation：flow control, circuit breaking and system adaptive protection with Alibaba Sentinel
• Service registration and discovery：instances can be registered with Alibaba Nacos and clients can discover the instances using Spring-managed beans. Supports Ribbon, the client side load-balancer via Spring Cloud Netflix
• Distributed Configuration：using Alibaba Nacos as a data store
• Event-driven：building highly scalable event-driven microservices connected with Spring Cloud Stream RocketMQ Binder
• Message Bus: link nodes of a distributed system with Spring Cloud Bus RocketMQ
• Distributed Transaction：support for distributed transaction solution with high performance and ease of use with Seata
• Dubbo RPC：extend the communication protocols of Spring Cloud service-to-service calls by Apache Dubbo RPC

Spring Cloud组件	组件的作用及描述	Spring Cloud Alibaba组件
Eureka | consul	服务注册与发现	Nacos
RestTemplate OpenFeign	服务间通信	Dubbo RPC
Hystrix	服务降级、熔断	Sentinel
Bus	事件驱动	RocketMQ
–	消息总线（异步处理）	Message Bus
–	分布式事务	Seata
Config	统一配置中心	Nacos

实际开发中，我们是SpringCloud与SpringCloudAlibaba混合使用的。

• 服务注册中心 ---------- Nacos
• 服务间通信与负载均衡 ---------- HttpRest（a:RestTemplate+Ribbon b: OpenFeign）
• 服务流控与服务降级 ---------- Sentinel
• 服务网关组件 ---------- Gateway
• 统一配置中心 ---------- Nacos

初始环境搭建

1.新建Module

2.pom.xml

这里我们使用的SpringBoot版本是2.2.5.RELEASE、SpringCloud版本是Hoxton.SR6、SpringCloud alibaba的版本是最新的2.2.1.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>

    <groupId>com.christy</groupId>
    <artifactId>springcloud_alibaba_parent</artifactId>
    <version>1.0-SNAPSHOT</version>

    <!--继承springboot父项目-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.5.RELEASE</version>
    </parent>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>

        <spring.cloud.version>Hoxton.SR6</spring.cloud.version>
        <spring.cloud.alibaba.version>2.2.1.RELEASE</spring.cloud.alibaba.version>
    </properties>

    <!--维护依赖-->
    <dependencyManagement>
        <dependencies>
            <!--维护springcloud-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring.cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <!--维护springcloud alibaba-->
            <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>
        </dependencies>

    </dependencyManagement>
</project>

springcloud_alibaba_parent作为全局的父项目我们就搭建完毕了，下一接我们从服务注册与发现（Nacos）学起。ヾ(◍°∇°◍)ﾉﾞ

本系列专题源码已经上传至gitee：https://gitee.com/tide001/springcloud_parent，欢迎下载交流