SpringCloud中的服务注册中心Eureka

1、什么是 EurekaEureka，这里是 Spring Cloud Eureka 的简称，是 Spring Cloud Netflix 组件之一。Spring Cloud Netflix 中核心的组件包括了服务治理（Eureka），服务容断（Hystrix），路由（Zuul）和客户端负载均衡（Ribbon）。Spring Cloud Eureka，是基于 Netflix Eureka （Netflix 是 Java 实现的开源软件）。服务治理（Eureka）包括服务注册、服务发现和服务检测监控等。2、Eureka微服务工程结构：

├── pom.xml                                            --
└── src
└── main
├── java
│   └── org
│       └── spring
│           └── springcloud
│               ├── CenterServiceApplication.java         --服务启动类
└── resources
└── application.yml                                --配置文件(跟properties一样的作用，只是结构性的，更利于理解)

3、

<?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.example</groupId><artifactId>center-service</artifactId><version>0.0.1-SNAPSHOT</version><packaging>war</packaging><name>center-service</name><description>..服务注册中心</description>

<!-- Spring Boot 启动父依赖 -->

    <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.10.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> <spring-cloud.version>Dalston.SR5</spring-cloud.version> </properties> <dependencies>

<!-- Spring Cloud Netflix Eureka Server 依赖 -->

      <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka-server</artifactId> </dependency>

<!-- Spring Boot Test 依赖 -->

    <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></project>3、application.yml：

server:port: 8888 # 服务端口eureka:instance:hostname: localhost # 设置主机名client:registerWithEureka: false # 是否向 Eureka 注册服务。该应用为服务注册中心，不需要自注册，设置为 falsefetchRegistry: false # 是否检索服务。该应用为服务注册中心，职责为注册和发现服务，无需检索服务，设置为 false    serviceUrl:      defaultZone: http://localhost:${server.port}/eureka/ #注册中心的地址server:waitTimeInMsWhenSyncEmpty: 0 # 设置同步为空时的等待时间。默认 5 * MINUTES4、CenterServiceApplication启动类

@SpringBootApplication -----SpringBoot的应用标志@EnableEurekaServer -----此注解标注了此服务为EurekaServer，并会自动化读取相关配置组件。public class CenterServiceApplication extends SpringBootServletInitializer{public static void main(String[] args){        //启动内嵌的应用服务器(Tomcat或jetty),并初始化Spring环境及Spring相关组建SpringApplication.run(CenterServiceApplication.class, args);}    //Spring Boot也支持将应用部署至已有的Tomcat容器, 或JBoss, WebLogic等传统Java EE应用服务器@Overrideprotected SpringApplicationBuilder configure(SpringApplicationBuilder application){return application.sources(CenterServiceApplication.class);}}