Nacos服务注册与调用

1.准备工作

我这里选择用springboot-2.2.5.RELEASE版本，因为最新版的springboot没有对应的nacos版本，这里选择使用Nacos Spring Cloud，需要导入的依赖有：

<dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    <version>2.2.5.RELEASE</version>
</dependency>

2.服务注册

首先创建一个Maven项目，然后新增两个Module，一个为提供者一个为消费者（provider、consumer），目录如下：

然后我们分别配置提供者与消费者的配置文件：

提供者：

server.port=8070
spring.application.name=service-provider
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848

消费者：

server.port=8080
spring.application.name=service-consumer
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848

然后在提供者与消费者的启动类都加上@EnableDiscoveryClient注解

提供者关键代码：

package com.zym.controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class TestController {
    @RequestMapping(value = "/echo/{string}", method = RequestMethod.GET)
    public String echo(@PathVariable String string) {
        return "Hello Nacos Discovery " + string;
    }
    @RequestMapping(value = "test",method = RequestMethod.GET)
    public String test(){
        return "success";
    }
}

消费者关键代码：

package com.zym.consumer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
@SpringBootApplication
@EnableDiscoveryClient
public class ConsumerApplication {
    @LoadBalanced
    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
    public static void main(String[] args) {
        SpringApplication.run(ConsumerApplication.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);
        }
        @RequestMapping(value = "/test",method = RequestMethod.GET)
        public String test(){
            return  restTemplate.getForObject("http://service-provider/test",String.class);
        }
    }
}

然后我们分别启动提供者与消费者，登录Nacos监控页面查看：

可以看到两个服务都注册到Nacos中了，然后我们分别在浏览器页面的url输入：

http://localhost:8080/echo/2021

http://localhost:8080/test

测试一下是否能调通：


至此，Nacos的简单服务注册发现就已经完成~