SpringCloud-Eureka:服务的注册与发现详解编程语言

<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>org.hope</groupId> 
  <artifactId>eureka-server</artifactId> 
  <version>1.0-SNAPSHOT</version> 
  <packaging>jar</packaging> 
 
  <name>eureka-server</name> 
 
  <properties> 
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> 
    <java.version>1.8</java.version> 
  </properties> 
 
  <parent> 
    <groupId>org.springframework.boot</groupId> 
    <artifactId>spring-boot-starter-parent</artifactId> 
    <version>1.5.2.RELEASE</version> 
    <relativePath/> <!-- lookup parent from repository --> 
  </parent> 
 
  <dependencies> 
    <dependency> 
      <groupId>org.springframework.cloud</groupId> 
      <artifactId>spring-cloud-starter-eureka-server</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>Dalston.RC1</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> 
      <snapshots> 
        <enabled>false</enabled> 
      </snapshots> 
    </repository> 
  </repositories> 
</project>

package org.hope; 
 
import org.springframework.boot.SpringApplication; 
import org.springframework.boot.autoconfigure.SpringBootApplication; 
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer; 
 
@EnableEurekaServer 
@SpringBootApplication 
public class EurekaServerApplication { 
 
    public static void main(String[] args) { 
        SpringApplication.run(EurekaServerApplication.class, args); 
    } 
}

server: 
  port: 8761 
 
eureka: 
  instance: 
    hostname: localhost 
  client: 
    #由于该应用为注册中心,所以设置为false,代表不向注册中心注册自己 
    registerWithEureka: false 
    #由于注册中心的职责就是维护服务实例,它并不需要去检索服务,所以也设置为false 
    fetchRegistry: false 
    serviceUrl: 
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

<dependency> 
    <groupId>org.springframework.cloud</groupId> 
    <artifactId>spring-cloud-starter-eureka</artifactId> 
</dependency> 
<dependency> 
    <groupId>org.springframework.boot</groupId> 
    <artifactId>spring-boot-starter-web</artifactId> 
</dependency> 
<dependency> 
    <groupId>org.springframework.boot</groupId> 
    <artifactId>spring-boot-starter-test</artifactId> 
    <scope>test</scope> 
</dependency>

package org.hope; 
 
import org.springframework.beans.factory.annotation.Value; 
import org.springframework.boot.SpringApplication; 
import org.springframework.boot.autoconfigure.SpringBootApplication; 
import org.springframework.cloud.client.discovery.EnableDiscoveryClient; 
import org.springframework.cloud.netflix.eureka.EnableEurekaClient; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RequestParam; 
import org.springframework.web.bind.annotation.RestController; 
 
@SpringBootApplication 
@EnableEurekaClient 
//@EnableDiscoveryClient 
@RestController 
public class ServiceApplication { 
 
    public static void main(String[] args) { 
        SpringApplication.run(ServiceApplication.class, args); 
    } 
 
}

package org.hope; 
 
import org.apache.log4j.Logger; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.cloud.client.ServiceInstance; 
import org.springframework.cloud.client.discovery.DiscoveryClient; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RequestMethod; 
import org.springframework.web.bind.annotation.RestController; 
 
@RestController 
public class HelloController { 
    private final Logger logger = Logger.getLogger(getClass()); 
 
    @Autowired 
    private DiscoveryClient client; 
 
    @RequestMapping(value = "hello", method = RequestMethod.GET) 
    public String index() { 
        ServiceInstance instance = client.getLocalServiceInstance(); 
        logger.info("/hello, host:" + instance.getHost() + ", service_id:" + instance.getServiceId()); 
        return "Hello World"; 
    } 
}

eureka: 
  client: 
    serviceUrl: 
      #注册中心的地址 
      defaultZone: http://localhost:8761/eureka/ 
server: 
  #当前服务端口号 
  port: 8762 
spring: 
  application: 
    #当前应用名称 
    name: service-hi