Spring Cloud Alibaba Nacos服务注册中心 ,之前我学习了Spring Cloud的服务注册中心,服务注册常用的主要是Eureka、Consul、Zookeeper等,而配置中心主要是Spring Cloud Config分布式配置中心。Nacos在作用上可以等价与Spring Cloud中Eureka+Config+Bus。下面先来学习一下Spring Cloud Alibaba Nacos的服务注册与发现。

1. 下载安装

这里Nacos支持的运行很多,为了快速安装运行,我还是在CentOS下使用Docker安装Nacos,快速上手。

1.1 下载镜像

这里下载的是最新版(不加版本号默认最新版)

docker pull nacos/nacos-server

1.2 运行镜像

docker run --env MODE=standalone --name nacos -d -p 8848:8848 nacos/nacos-server

1.3 Web访问测试

完成上面步骤,访问地址 ip:8848/nacos 即可自动到登陆界面

使用默认的 账号:nacos 密码:nacos登录

到这里为止,nacos的安装就完成了

2. 服务提供者1

先建一个 cloud-alibaba-provider-payment9001 项目作为服务提供者

2.1 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">
    <parent>
        <artifactId>live.yremp.springcloud</artifactId>
        <groupId>live.yremp</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-alibaba-provider-payment9001</artifactId>

    <dependencies>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

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

</project>

2.2 配置文件

server:
  port: 9001

spring:
  application:
    name: nacos-payment-provider
  cloud:
    nacos:
      discovery:
        server-addr: 39.105.173.178:8848 #配置Nacos地址

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

2.3 主启动类

package live.yremp.springcloud;

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

@SpringBootApplication
@EnableDiscoveryClient
public class NacosProviderMain9001 {
    public static void main(String[] args) {
        SpringApplication.run(NacosProviderMain9001.class,args);
    }
}

2.4 业务代码

主要就一个Controller

package live.yremp.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;
    }
}

2.5 启动测试

完成上面的新建工作之后启动服务进行测试,先测试应用访问接口

应用接口访问测试正常,然后去Nacos后台查看服务是否注册成功

服务也已经成功注册到Nacos

3. 服务提供者2

再建一个 cloud-alibaba-provider-payment9002 项目作为服务提供者,主要是为了方便后面的服务负载均衡使用,和 cloud-alibaba-provider-payment9001 除了端口不同外其他都是一样的

3.1 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">
    <parent>
        <artifactId>live.yremp.springcloud</artifactId>
        <groupId>live.yremp</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-alibaba-provider-payment9001</artifactId>

    <dependencies>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

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

</project>

3.2 配置文件

server:
  port: 9002

spring:
  application:
    name: nacos-payment-provider
  cloud:
    nacos:
      discovery:
        server-addr: 39.105.173.178:8848 #配置Nacos地址

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

3.3 主启动类

package live.yremp.springcloud;

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

@SpringBootApplication
@EnableDiscoveryClient
public class NacosProviderMain9002 {
    public static void main(String[] args) {
        SpringApplication.run(NacosProviderMain9002.class,args);
    }
}

3.4 业务代码

主要就一个Controller

package live.yremp.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;
    }
}

3.5 启动测试

也是先测试 服务请求接口

查看是否注册成功

可以看到有两个实例数,即注成功

4. 服务消费者注册和负载均衡

新建cloud-alibaba-consumer-order83项目作为服务消费者

4.1 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">
    <parent>
        <artifactId>live.yremp.springcloud</artifactId>
        <groupId>live.yremp</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-alibaba-consumer-order83</artifactId>

    <dependencies>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

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

</project>

4.2 配置文件

server:
  port: 83


spring:
  application:
    name: nacos-order-consumer
  cloud:
    nacos:
      discovery:
        server-addr: 39.105.173.178:8848


#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

4.3 主启动类

package live.yremp.cloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class NacosOrderMain83 {
    public static void main(String[] args) {
        SpringApplication.run(NacosOrderMain83.class,args);
    }
}

4.4 配置类

需要使用RestTemplate 和Ribbon的负载均衡功能,所以要新建下面的配置类并开启 @LoadBalanced 注解

package live.yremp.cloud.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();
    }
}

4.5 业务代码

还是一个Controller 去以负载均衡的方式调用另外两个服务提供者服务

package live.yremp.cloud.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;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;


@RestController
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);
    }

}

4.6 启动测试

启动三个项目进行测试,先测试 /consumer/payment/nacos/{id} 接口,能否正常访问和实现负载均衡

可以看到默认的轮询方式去调用两个服务提供者是正常的,然后去Nacos后台看看服务消费者 是否注册成功

可以看到两个不同的服务都注册成功了

以上就是Spring Cloud Alibaba Nacos 服务注册中心的大概内容,后面继续Nacos作为配置中心的学习。

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Spring Cloud Alibaba Nacos服务注册中心
本文最后更新于2020年7月28日,已超过 1 个月没更新!