Alibaba Cloud Demo

1.安装并启动Nacos Server

先看看官方的安装说明

It is super easy to get started with your first project.

Step 1: Download the binary package

You can download the package from the latest stable release.

Take release nacos-server-1.0.0.zip for example.

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

Step 2: Start Server

On the Linux/Unix/Mac platform, run the following command to start server with standalone mode:

sh startup.sh -m standalone

On the Windows platform, run the following command to start server with standalone mode. Alternatively, you can also double-click the startup.cmd to run NacosServer.

cmd startup.cmd -m standalone

For more details, see quick-start.

按照上述步骤安装成功后，访问本地Nacos Server呈现结果如下图：

2.创建Nacos Service Provider

1. Add the Nacos Spring Cloud dependency.

<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    <version>${latest.version}</version>
</dependency>

Note: Version 2.1.x.RELEASE is compatible with the Spring Boot 2.1.x line. Version 2.0.x.RELEASE is compatible with the Spring Boot 2.0.x line. Version 1.5.x.RELEASE is compatible with the Spring Boot 1.5.x line.

1. Configure the service provider, so that it can register its services to the Nacos server.

i. Add the Nacos server address in application.properties :

server.port=8070
spring.application.name=service-provider

spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848

ii. Enable service discovery by adding the Spring Cloud native annotation of @EnableDiscoveryClient:

@SpringBootApplication
@EnableDiscoveryClient
public class NacosProviderApplication {

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

	@RestController
	class EchoController {
		@RequestMapping(value = "/echo/{string}", method = RequestMethod.GET)
		public String echo(@PathVariable String string) {
			return "Hello Nacos Discovery " + string;
		}
	}
}

3.创建Nacos Service Consumer

1. Configure the service consumer so that it can discover the services that it would like to call on the Nacos server.

i. Configure the Nacos server address in application.properties :

server.port=8080
spring.application.name=service-consumer

spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848

ii. Add the Spring Cloud native annotation of @EnableDiscoveryClient to enable service discovery. Add the @LoadBalanced annotation for the RestTemplate instance, and enable the integration of @LoadBalanced and Ribbon:

@SpringBootApplication
@EnableDiscoveryClient
public class NacosConsumerApplication {

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

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

    @RestController
    public class TestController {

        private final RestTemplate restTemplate;

        @Autowired
        public TestController(RestTemplate restTemplate) {this.restTemplate = restTemplate;}

        @RequestMapping(value = "/echo/{str}", method = RequestMethod.GET)
        public String echo(@PathVariable String str) {
            return restTemplate.getForObject("http://service-provider/echo/" + str, String.class);
        }
    }
}

4.运行及测试

Start ProviderApplication and ConsumerApplication , and call http://localhost:8080/echo/2018. You will get a returned message of Hello Nacos Discovery 2018.

Nacos Service Provider和Nacos Service Consumer成功启动后，从Nacos Server管理页面应该可以看到这两个服务

调用本地Nacos Service Consumer中提供的测试方法，结果如下图