Nacos---作为服务注册中心

概述

SpringCloudAlibaba官方博客文档:https://github.com/alibaba/spring-cloud-alibaba/blob/master/README-zh.md

是什么？

一个更易于构建原生应用的动态服务发现、配置管理和服务管理平台。Nacos全称"Dynamic Naming and Configuration Service"。Nacos就是注册中心+配置中心的组合。等价于Nacos=Eureka+Config+Bus。

作用

1.替代Eureka做服务注册中心
2.替代Config做服务配置中心

下载

下载地址：https://github.com/alibaba/Nacos
中文官网文档：https://nacos.io/zh-cn/
官方文档：https://spring-cloud-alibaba-group.github.io/github-pages/greenwich/spring-cloud-alibaba.html#_spring_cloud_alibaba_nacos_discovery

安装并运行Nacos

1.本地Java8+Maven环境已经ok
2.先从官网下载Nacos
3.解压安装包，直接运行bin目录下的startup.cmd
4.命令运行成功后直接访问http://localhost:8848/nacos（默认用户名密码都是nacos）
5.结果页面

Nacos作为服务注册中心演示

官方网址查看：https://spring-cloud-alibaba-group.github.io/github-pages/greenwich/spring-cloud-alibaba.html#_spring_cloud_alibaba_nacos_discovery

基于Nacos的服务提供者cloudalibaba-provider-payment9001

父pom.xml中锁定版本

   <!--Spring cloud alibaba 2.1.0.RELEASE-->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring.cloud.alibaba.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

子pom.xml

   <!--SpringCloud ailibaba nacos -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

application.yml

server:
  port: 9001

spring:
  application:
    name: nacos-payment-provider
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848 #配置Nacos地址

management:
  endpoints:
    web:
      exposure:
        include: '*'

主启动类增加@EnableDiscoveryClient注解

package com.czf.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient
public class PaymentApplication9001 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentApplication9001.class,args);
    }
}

Controller

package com.czf.springcloud.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class PaymentController
{
    @Value("${server.port}")
    private String serverPort;

    @GetMapping(value = "/payment/nacos/{id}")
    public String getPayment(@PathVariable("id") Integer id)
    {
        return "nacos registry, serverPort: "+ serverPort+"\t id"+id;
    }
}

测试

基于Nacos的服务消费者cloudalibaba-consumer-nacos-order-83

pom.xml

 <!--SpringCloud ailibaba nacos -->
    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    </dependency>

application.yml

server:
  port: 83


spring:
  application:
    name: nacos-order-consumer
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848


#消费者将要去访问的微服务名称(注册成功进nacos的微服务提供者)
service-url:
  nacos-user-service: http://nacos-payment-provider

主启动类

package com.czf.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;


@EnableDiscoveryClient
@SpringBootApplication
public class OrderNacosMain83
{
    public static void main(String[] args)
    {
        SpringApplication.run(OrderNacosMain83.class,args);
    }
}

Controller

package com.czf.springcloud.controller;
 
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
 
import javax.annotation.Resource;
 
/**
 * @auther zzyy
 * @create 2020-02-23 15:01
 */
@RestController
@Slf4j
public class OrderNacosController
{
    @Resource
    private RestTemplate restTemplate;
 
    @Value("${service-url.nacos-user-service}")
    private String serverURL;
 
    @GetMapping(value = "/consumer/payment/nacos/{id}")
    public String paymentInfo(@PathVariable("id") Long id)
    {
        return restTemplate.getForObject(serverURL+"/payment/nacos/"+id,String.class);
    }
 
}

配置类

package com.czf.springcloud.config;
 
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;
@Configuration
public class ApplicationContextConfig
{
    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate()
    {
        return new RestTemplate();
    }
}

测试

再开启一个支付接口（轮询）

nacos生产者与消费者配置文件对比