Nacos服务注册与发现

安装Nacos

• 下载二进制包

  下载地址

• 解压

  unzip nacos-server-1.0.0.zip
  cd nacos/bin 
  

• 启动

  sh startup.sh -m standalone
  

• 打开登陆地址

  http://localhost:8848/nacos/
  

添加Spring Cloud Alibaba依赖

<dependencyManagement>
        <dependencies>
            <!--spring-boot-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.1.2.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!-- spring-cloud -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Greenwich.SR2</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!-- spring-cloud-alibaba -->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2.1.0.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

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

        <!--nacos注册中心-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
    </dependencies>

编写服务提供者

@RestController
@EnableDiscoveryClient
@SpringBootApplication
public class NacosDiscoveryProviderApplication {

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


    @GetMapping("/hello")
    public String hello(){
        return "hello nacos-discovery-provider";
    }
}

配置注册到Nacos

server:
  port: 8085
spring:
  application:
    name: nacos-discovery-provider
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848

看到日志

2020-10-10 23:14:10.152  INFO 54121 --- [           main] c.a.c.n.registry.NacosServiceRegistry    : nacos registry, nacos-discovery-provider 192.168.0.105:8085 register finished

表示已经成功注册到nacos，如图：

nacos注册服务者

编写消费者代码

@RestController
@EnableDiscoveryClient
@SpringBootApplication
public class NacosDiscoveryConsumerApplication {

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

    @Bean
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }
}

使用Ribbon做客户端负载均衡调用服务者

@RestController
public class HelloController {
    @Autowired
    RestTemplate restTemplate;
    @Autowired
    LoadBalancerClient loadBalancerClient;

    @GetMapping("/hello")
    public String HelloClient(String name){
        ServiceInstance serviceInstance = loadBalancerClient.choose("nacos-discovery-provider");
        URI uri = serviceInstance.getUri();
        return restTemplate.getForObject(uri + "hello?name=" + name, String.class);
    }
}

配置文件与服务端类似

server:
  port: 18085
spring:
  application:
    name: nacos-discovery-consumer
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848

两者都成功注册到Nacos里

image-20201011102305466

调用消费者/hello服务，可以调用Provider提供的服务

image-20201011102401045