使用Eureka将Node.js引入Spring Cloud

简介
- Spring Cloud是目前非常流行的微服务化解决方案，它将Spring Boot的便捷开发和Netflix OSS的丰富解决方案结合起来。如我们所知，Spring Cloud不同于Dubbo，使用的是基于HTTP(s)的Rest服务来构建整个服务体系。
- Eureka是Netflix开发的服务发现框架，SpringCloud将它集成在自己的子项目spring-cloud-netflix中，实现SpringCloud的服务发现功能。

服务端配置（Java）

application.properties

server.port=1111
eureka.instance.hostname=localhost
spring.application.name=localhost
eureka.client.register-with-eureka=true
eureka.client.fetch-registry=true
eureka.client.serviceUrl.defaultZone=http://${eureka.instance.hostname}:${server.port}/eureka/

pom.xml

<?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.didispace</groupId>
	<artifactId>eureka-server</artifactId>
	<version>1.0.0</version>
	<packaging>jar</packaging>
	<name>eureka-server</name>
	<description>Spring Cloud project</description>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.3.5.RELEASE</version>
		<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.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka-server</artifactId>
		</dependency>
	</dependencies>
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Brixton.RELEASE</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>

Application.java

package com.didispace;

import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        new SpringApplicationBuilder(Application.class).web(true).run(args);
    }
}

Node.js配置

安装eureka-client
1
npm install eureka-client --save
安装express
1
npm install express --save

注册服务

var Eureka = require('eureka-client').Eureka;
const client = new Eureka({
    instance: {
        app: 'PhoneQ',
        hostName: 'localhost',
        ipAddr: '127.0.0.1',
        statusPageUrl: 'http://localhost:3333',
        port: {
            '$': 3333,
            '@enabled': 'true',
        },
        vipAddress: 'test.something.com',
        dataCenterInfo: {
            '@class': 'com.netflix.appinfo.InstanceInfo$DefaultDataCenterInfo',
            name: 'MyOwn',
        },
    },
    eureka: {
        serviceUrl: ['http://localhost:1111/eureka/apps/'],
    },
});
client.start(function(error) {
    console.log(error || 'Node server register completed');
});

使用express挂起服务

const express = require('express');
const app = express();
app.get('/health', (req, res) => {
    res.json({
        status: 'UP'
    });
});
app.get('/', (req, res, next) => {
    res.json({status: true,message:"It's works!"});
});
app.listen(3333);

测试Eureka服务

启动Eureka服务，在浏览器输入http://localhost:1111/，看到类似下面的图片即说明服务成功开启：
使用Node.js注册

将上面Node.js注册服务部分代码保存到index.js，然后开启终端输入：node index.js，看到类似下面的结果说明服务成功注册：
查看注册服务

浏览器输入http://localhost:1111/，可以看到服务已经成功注册了：
测试express服务

浏览器输入http://localhost:3333，可以看到服务已经挂起来了：

至此，Node.js成功引入Spring Cloud，看到这里的你也赶快动手试试吧，祝你成功！