Spring Cloud Eureka 入门之服务提供者详解

├── springcloud-eureka-client-customer 
├── springcloud-eureka-client-provider 
└── springcloud-eureka-server 
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git clone https://github.com/JeffLi1993/ ... e.git 
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cd springcloud-learning-example  
mvn clean install 
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2017-07-10 16:03:15.075  INFO 11020 --- [           main] o.s.c.n.e.s.EurekaServiceRegistry        : Registering application provider-service with eureka with status UP2017-07-10 16:03:15.075  INFO 11020 --- [           main] com.netflix.discovery.DiscoveryClient    : Saw local status change event StatusChangeEvent [timestamp=1499673795075, current=UP, previous=STARTING]2017-07-10 16:03:15.079  INFO 11020 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_PROVIDER-SERVICE/10.18.29.31:provider-service:8080: registering service...2017-07-10 16:03:15.126  INFO 11020 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_PROVIDER-SERVICE/10.18.29.31:provider-service:8080 - registration status: 2042017-07-10 16:03:15.183  INFO 11020 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)2017-07-10 16:03:15.185  INFO 11020 --- [           main] .s.c.n.e.s.EurekaAutoServiceRegistration : Updating port to 80802017-07-10 16:03:15.191  INFO 11020 --- [           main] o.s.springcloud.ProviderApplication      : Started ProviderApplication in 9.809 seconds (JVM running for 10.981) 
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├── pom.xml└── src 
    └── main 
        ├── java 
        │   └── org 
        │       └── spring 
        │           ├── springcloud 
        │           │    └──  ProviderApplication.java 
        │           └── web 
        │                └──  ProviderController.java 
        └── resources 
            └── application.yml 
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<?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/ma ... gt%3B 
    <modelVersion>4.0.0</modelVersion>    <groupId>springcloud</groupId>    <artifactId>springcloud-eureka-client-provider</artifactId>    <version>0.0.1-SNAPSHOT</version>    <name>springcloud-eureka-client-provider :: 服务提供者</name>    <!-- Spring Boot 启动父依赖 --> 
    <parent> 
        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.5.4.RELEASE</version>    </parent> 
    <dependencies> 
        <!-- Spring Cloud Netflix Eureka Client 依赖 --> 
        <dependency> 
            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-eureka</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> 
            <!-- Spring Cloud Netflix 依赖 --> 
            <dependency> 
                <groupId>org.springframework.cloud</groupId>                <artifactId>spring-cloud-netflix</artifactId>                <version>1.3.1.RELEASE</version>                <type>pom</type>                <scope>import</scope>            </dependency> 
        </dependencies> 
    </dependencyManagement> 
    <build> 
        <plugins> 
            <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> 
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server: 
  port: 8080 # 服务端口eureka: 
  client: 
    service-url: 
      defaultZone: http://localhost:8888/eureka/ # 服务注册中心地址spring: 
  application: 
    name: provider-service # 服务名称 
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/** 
 * Spring Boot Eureka Server 应用启动类 
 * 
 * Created by bysocket on 21/06/17. 
 */@EnableEurekaClient     // Eureka Client 标识@SpringBootApplication  // Spring Boot 应用标识public class ProviderApplication {    public static void main(String args) {        // 程序启动入口 
        // 启动嵌入式的 Tomcat 并初始化 Spring 环境及其各 Spring 组件 
        SpringApplication.run(ProviderApplication.class,args); 
    } 
} 
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/** 
 * Provider HelloWorld 案例 
 * <p> 
 * Created by bysocket on 06/22/17. 
 */@RestControllerpublic class ProviderController {    private static final Logger LOGGER = LoggerFactory.getLogger(ProviderController.class); 
    @Autowired    private Registration registration;       // 服务注册 
    @Autowired    private DiscoveryClient discoveryClient; // 服务发现客户端 
    @RequestMapping("/provider")    public String provider() { 
        ServiceInstance instance = serviceInstance(); 
        LOGGER.info("provider service, host = " + instance.getHost() 
                + ", service_id = " + instance.getServiceId());        return "Hello,Provider!"; 
    }    /** 
     * 获取当前服务的服务实例 
     * 
     * @return ServiceInstance 
     */ 
    public ServiceInstance serviceInstance() {        List<ServiceInstance> list = discoveryClient.getInstances(registration.getServiceId());        if (list != null && list.size() > 0) {            return list.get(0); 
        }        return null; 
    } 
} 
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