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Spring Cloud是一个基于Spring Boot实现的云应用开发工具，它为基于JVM的云应用开发中的配置管理、服务发现、断路器、智能路由、微代理、控制总线、全局锁、决策竞选、分布式会话和集群状态管理等操作提供了一种简单的开发方式。
Spring Cloud包含了多个子项目（针对分布式系统中涉及的多个不同开源产品），比如：Spring Cloud Config、Spring Cloud Netflix、Spring Cloud CloudFoundry、Spring Cloud AWS、Spring Cloud Security、Spring Cloud Commons、Spring Cloud Zookeeper、Spring Cloud CLI等项目。
1.微服务
微服务主要包含服务注册，服务发现，服务路由，服务配置，服务熔断，服务降级等一系列的服务，而Spring Cloud为我们提供了个一整套的服务；
本例子为你提供了最简单的一个服务发现例子，包含服务注册发现spingCloudEurekaServer、服务配置中心spingCloudConfServer、以及一个app应用springCloudApp
2.服务注册与发现
spingCloudEurekaServer
pom.xml
<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.caicongyang</groupId> <artifactId>spingCloudEurekaServer</artifactId> <version>0.0.1-SNAPSHOT</version> <parent> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-parent</artifactId> <version>Angel.SR6</version> </parent> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka-server</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>Application.java
package com.caicongyang.eureka; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer; @SpringBootApplication @EnableEurekaServer public class Application { public static void main(String[] args) { SpringApplication.run(Application.class, args); } }application.yml （可用properties替代）
server: port: 9999 eureka: instance: hostname: 127.0.0.1 client: registerWithEureka: false fetchRegistry: false serviceUrl: defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/3.服务配置（全局配置中心）
pom.xml
<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.caicongyang</groupId> <artifactId>spingCloudConfServer</artifactId> <version>0.0.1-SNAPSHOT</version> <parent> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-parent</artifactId> <version>Angel.SR6</version> </parent> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-config-server</artifactId> </dependency> <!-- sping cloud 注册服务 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> <defaultGoal>compile</defaultGoal> </build> </project>application.java
package com.caiconyang.conf; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.config.server.EnableConfigServer; @SpringBootApplication @EnableConfigServer public class Application { public static void main(String[] args) { SpringApplication.run(Application.class,args); } }application.properties
server.port=8888 ## App配置文件所在git地址 spring.cloud.config.server.git.uri=https://git.oschina.net/caicongyang/springCloudConfigRepo.git spring.cloud.config.server.git.searchPaths=repo spring.application.name=spingCloudConfServer4.App
pom.xml
<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.caicongyang</groupId> <artifactId>springCloudApp</artifactId> <version>0.0.1-SNAPSHOT</version> <parent> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-parent</artifactId> <version>Angel.SR6</version> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <java.version>1.7</java.version> <java.encoding>UTF-8</java.encoding> <springfox.swagger.version>2.2.2</springfox.swagger.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- sping cloud 监控 http://localhost:8080/health --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-config</artifactId> </dependency> <!-- sping cloud 注册服务 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka</artifactId> </dependency> <!-- sping cloud 路由 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-hystrix</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger2</artifactId> <version>${springfox.swagger.version}</version> </dependency> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger-ui</artifactId> <version>${springfox.swagger.version}</version> </dependency> </dependencies> <build> <finalName>spingcould</finalName> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>${java.version}</source> <target>${java.version}</target> <encoding>${java.encoding}</encoding> <showWarnings>true</showWarnings> </configuration> </plugin> </plugins> </build> </project>Application.java
package com.caicongyang.springCloudApp.main; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.EnableAutoConfiguration; import org.springframework.cloud.client.discovery.EnableDiscoveryClient; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; @Configuration//配置控制 @EnableAutoConfiguration//启用自动配置 @ComponentScan(value={"com.caicongyang.springCloudApp"})//组件扫描 @EnableDiscoveryClient public class Application { public static void main(String[] args) { //第一个简单的应用， SpringApplication.run(Application.class,args); } }SwaggerConfig.java
package com.caicongyang.springCloudApp.conf; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import springfox.documentation.service.ApiInfo; import springfox.documentation.spi.DocumentationType; import springfox.documentation.spring.web.plugins.Docket; import springfox.documentation.swagger2.annotations.EnableSwagger2; @Configuration @EnableSwagger2 public class SwaggerConfig { @Value("${swagger.ui.enable}") //该配置项在配置中心管理 private boolean environmentSpecificBooleanFlag; @Bean public Docket docketFactory() { return new Docket(DocumentationType.SWAGGER_2).apiInfo( new ApiInfo("接口文档", "SpingCloud web接口列表", "1.0", "", "", "", "")).enable(environmentSpecificBooleanFlag); } }application.properties
server.port=8080 spring.cloud.config.uri=http://127.0.0.1:8888 spring.cloud.config.name=springCloudApp spring.cloud.config.profile=${config.profile:dev} #service discovery url eureka.client.serviceUrl.defaultZone=http://localhost:9999/eureka/ #service name spring.application.name=springCloudApp5.测试与验证
顺序启动服务注册发现spingCloudEurekaServer、服务配置中心spingCloudConfServer、以及一个app应用springCloudApp
测试与验证
访问http://localhost:9999/eureka/ app是否已经注册上来
访问 http://localhost:8080/swagger-ui.html 是否正常访问，如果正常访问说明争取读取到config配置中心的swagger.ui.enable配置项
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