java微服务怎么集群_微服务：Eureka配置集群环境

一、注册中心编码

1.使用idea创建一个spring boot项目，pom如下：

4.0.0

com.eureka

ser

0.0.1-SNAPSHOT

jar

ser

Demo project for Spring Boot

org.springframework.boot

spring-boot-starter-parent

2.0.3.RELEASE

UTF-8

UTF-8

1.8

Finchley.RELEASE

org.springframework.cloud

spring-cloud-starter-netflix-eureka-server

org.springframework.boot

spring-boot-starter-test

test

org.springframework.cloud

spring-cloud-dependencies

${spring-cloud.version}

pom

import

org.springframework.boot

spring-boot-maven-plugin

2.这里开发3个样例，组成集群。3个样例的pom不变，application.yml如下：

#样例1:

server:

port:8888eureka:

instance:

hostname: centos7-01client:

registerWithEureka:falsefetchRegistry:falseserviceUrl:

defaultZone: http://centos7-02:8888/eureka/,http://centos7-03:8888/eureka/

#样例2：

server:

port:8888eureka:

instance:

hostname: centos7-02client:

registerWithEureka:falsefetchRegistry:falseserviceUrl:

defaultZone: http://centos7-01:8888/eureka/,http://centos7-03:8888/eureka/

#样例3：

server:

port:8888eureka:

instance:

hostname: centos7-03client:

registerWithEureka:falsefetchRegistry:falseserviceUrl:

defaultZone: http://centos7-01:8888/eureka/,http://centos7-02:8888/eureka/

3.这些样例的java代码一样：

package com.eureka.ser;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication

@EnableEurekaServerpublic classSerApplication {public static voidmain(String[] args) {

SpringApplication.run(SerApplication.class, args);

}

}

4.打包，要在项目的根路径

二、部署运行

1.这里开启3台虚拟机，域名分布为centos7-01  centos7-02  centos7-03，上面的yml文件的hostname与之对应。将这3个jar文件分别运行

2.查看结果，在本机访问虚拟机时，需要关闭虚拟机的防火墙(或者开放端口)；

把url换为centos7-02   centos7-03，会看到类似的结果，说明3台服务已经协调运行了

三、客户端注册

1. 新创建一个spring boot项目，其中pom文件如上，yml和java代码如下，然后按照上面的方式打包运行

eureka:

client:

serviceUrl:

defaultZone: http://centos7-02:8888/eureka/ ###这里只向centos7-02注册，会向另外两台会同步过去

server:

port:80spring:

application:

name: eureka-cli

package com.cloud.eurekacli01;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

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;

import java.text.SimpleDateFormat;

import java.util.Date;

@SpringBootApplication

@EnableEurekaClient

@RestControllerpublic classEurekaCli01Application {public static voidmain(String[] args) {

SpringApplication.run(EurekaCli01Application.class, args);

}@RequestMapping("/")publicString index(){

SimpleDateFormat sdf= new SimpleDateFormat("YYYY-MM-DD hh:mm:ss");

String time= sdf.format(newDate());return "current time is"+time;

}

}

2. 查看注册结果，打开3个中任意一个注册界面，都会有如下结果，说明客户端已经成功在集群上注册了

3.访问客户端 (客户端是在本地启动的)