[bigdata-106] spring-cloud-03 创建一个hello服务并把它注册到eurake server双机高可用集群

1. 参考文档
https://github.com/dyc87112/SpringCloudBook/tree/master/hello-service
2. 源码结构

.

├── pom.xml

├── src

│   ├── main

│   │   ├── java

│   │   │   └── com

│   │   │       └── brian

│   │   │           └── demo

│   │   │               └── helloservice

│   │   │                   └── App.java

│   │   └── resources

│   │       └── application.properties

3. pom.xml内容如下：

<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.brian.demo</groupId>
<artifactId>helloservice</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.7.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>

<name>helloservice</name>
<url>http://maven.apache.org</url>

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

<repositories>
<repository>
<id>my-nexus-central</id>
<name>my local nexus</name>
<url>http://localhost:8081/nexus/content/repositories/central/</url>
<releases>
<enabled>true</enabled>
<updatePolicy>never</updatePolicy>
</releases>
</repository>
</repositories>

<dependencies>
<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>

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

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

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>

<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Brixton.SR5</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>

4. App.java

package com.brian.demo.helloservice;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.hystrix.EnableHystrix;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
@EnableHystrix
@EnableDiscoveryClient
@SpringBootApplication
public class App {

@Autowired
private DiscoveryClient client;

@RequestMapping(value = "/hello", method = RequestMethod.GET)
public String hello() throws Exception {
ServiceInstance instance = client.getLocalServiceInstance();
return "Hello World"+"-"+instance.getHost()+"-"+instance.getPort()+"-"+instance.getServiceId();
}

public static void main(String[] args) {
SpringApplication.run(App.class, args);
}

}

5. application.properties

spring.application.name=hello-service
server.port=8087
eureka.client.serviceUrl.defaultZone=http://peer1:1111/eureka/,http://peer2:1112/eureka/

6. 编译

mvn clean package

7. 运行

nohup java -jar target/helloservice-0.0.1-SNAPSHOT.jar &

8. 观察

在http://peer1:1111/和http://peer2:1112/均能看到这个服务被注册，包括ip和端口号。