springcloud特性

springcloud作为spring团队的微服务架构，其有如下的特性(摘自官方文档)

• Distributed/versioned configuration(分布式/版本化配置)
• Service registration and discovery(服务注册与发现)
• Routing(路由)
• Service-to-service calls(服务间远程调用)
• Load balancing(负载均衡)
• Circuit Breakers(熔断器)
• Distributed messaging(分布式消息)

应该就是微服务的相关特性，笔者不对上述的概念进行阐述，读者可相应的查阅相关文档

springcloud config

springcloud板块下有很多的分支，根本看不过来，就挑笔者比较感兴趣的配置管理springcloud config作为分析的入口把。具体的使用以及概念本文就不展开了，在官方文档上都有，笔者喜欢从源码角度看下springcloud是如何整合springboot进行扩展的

MAVEN依赖

根据官方的例子，笔者最后还是通过IDEA开发工具引入Spring Initializr构建工具来生成springcloud config的相关maven配置

<?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>2.1.1.RELEASE</version>         <relativePath/> <!-- lookup parent from repository -->     </parent>     <groupId>com.example</groupId>     <artifactId>cloud-demo</artifactId>     <version>0.0.1-SNAPSHOT</version>     <name>cloud-demo</name>     <description>Demo project for Spring Boot</description>      <properties>         <java.version>1.8</java.version>         <spring-cloud.version>Greenwich.RC2</spring-cloud.version>     </properties>      <dependencies>         <dependency>             <groupId>org.springframework.cloud</groupId>             <artifactId>spring-cloud-config-server</artifactId>         </dependency>         <dependency>             <groupId>org.springframework.cloud</groupId>             <artifactId>spring-cloud-starter-config</artifactId>         </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>${spring-cloud.version}</version>                 <type>pom</type>                 <scope>import</scope>             </dependency>         </dependencies>     </dependencyManagement>      <build>         <plugins>             <plugin>                 <groupId>org.springframework.boot</groupId>                 <artifactId>spring-boot-maven-plugin</artifactId>             </plugin>         </plugins>     </build>      <repositories>         <repository>             <id>spring-milestones</id>             <name>Spring Milestones</name>             <url>https://repo.spring.io/milestone</url>         </repository>     </repositories>  </project> 

其依托于spring-boot-starter-parent板块进行构建，上述的简单配置其实引入了spring/springboot/springcloud三大板块及其相应依赖，具体就展示了，读者可自行查看

springcloud config 启动

官方文档上提供了命令方式的启动

linux方式启动

$ cd spring-cloud-demo $ ./mvnw spring-boot:run

window方式启动

> cd spring-cloud-demo > call mvnw.cmd spring-boot:run

IDEA方式启动，直接运行ConfigServerApplication启动类(springcloud包内的启动类，读者可下载源码来运行)

package org.springframework.cloud.config.server;  import org.springframework.boot.autoconfigure.EnableAutoConfiguration; import org.springframework.boot.builder.SpringApplicationBuilder; import org.springframework.context.annotation.Configuration;  @Configuration @EnableAutoConfiguration @EnableConfigServer public class ConfigServerApplication {      public static void main(String[] args) {         new SpringApplicationBuilder(ConfigServerApplication.class)                 .properties("spring.config.name=configserver").run(args);     }  }

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