springcloud.4.創建服務提供者

服務即是處理真正業務的服務
創建一個springboot工程，pom文件配置和eureka的沒什麼差別

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <artifactId>hello-spring-cloud-service-admin</artifactId>
    <packaging>jar</packaging>

    <parent>
        <groupId>com.yuu</groupId>
        <artifactId>hello-spring-cloud-dependencies</artifactId>
        <version>1.0.0-SNAPSHOT</version>
        <relativePath>../hello-spring-cloud-dependencies/pom.xml</relativePath> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>

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

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

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.SR2</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <!--程序入口類  爲了java -jar 命令能夠使程序啓動，沒有此配置則使用java -jar命令時會報錯-->
                    <mainClass>com.yuu.hello.spring.cloud.service.admin.ServiceAdminApplication</mainClass>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

application.yml的配置需要注意

spring:
  application:
    name: hello-spring-cloud-service-admin

server:
  port: 8763

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka

其中eureka.client.serviceUrl.defaultZone指明瞭eureka的地址，即此服務需要想註冊中新註冊，使其發現此服務

啓動類代碼：

package com.yuu.hello.spring.cloud.service.admin;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
public class ServiceAdminApplication {
    public static void main(String[] args){
        SpringApplication.run(ServiceAdminApplication.class,args);
    }
}

其中@EnableEurekaClient聲明瞭此服務爲eureka的客戶端