nocos注册中心使用教程

1.下载和安装

进入到官网下载就好了

解压

启动

2.新建提供者模块

2.1新建提供者模块cloudalibaba-provider-payment9001

2.1.1在父项目中新加入依赖

<dependency>
	  <groupId>com.alibaba.cloudgroupId>
	  <artifactId>spring-cloud-alibaba-dependenciesartifactId>
	  <version>2.1.0.RELEASEversion>
	  <type>pomtype>
	  <scope>importscope>
dependency>

2.1.2在cloudalibaba-provider-payment9001的pom中加入

<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>cloud2020artifactId>
        <groupId>com.cao.springcloudgroupId>
        <version>1.0-SNAPSHOTversion>
    parent>
    <modelVersion>4.0.0modelVersion>

    <artifactId>cloudalibaba-provider-payment9001artifactId>

    <dependencies>
        
        <dependency>
            <groupId>com.alibaba.cloudgroupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discoveryartifactId>
        dependency>
        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-actuatorartifactId>
        dependency>
        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-devtoolsartifactId>
            <scope>runtimescope>
            <optional>trueoptional>
        dependency>
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <optional>trueoptional>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
    dependencies>
project>

2.1.3yml写配置

server:
  port: 9001

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

2.1.4写主启动类、和Controller的代码

主启动类代码编写 @EnableDiscoveryClient

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


@EnableDiscoveryClient
@SpringBootApplication
public class PaymentMain9001 {
	public static void main(String[] args) {
		SpringApplication.run(PaymentMain9001.class, args);
	}
}

controller代码编写

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;

/**
 * @author caowenbin
 * @Title: PaymentController
 * @Package com.cao.cloudalibaba
 * @Description: nacos_Controller
 * @date 2023/10/16 0:02
 */
@RestController
public class PaymentController {
	@Value("${server.port}")
	private String serverPort;

	// http://localhost:9001/payment/nacos/1
	@GetMapping(value = "/payment/nacos/{id}")
	public String getPayment(@PathVariable("id") Integer id) {
		return "nacos registry, serverPort: " + serverPort + "\t id: " + id;
	}
}

2.1.5测试

2.2重复步骤2.1新建提供者cloudalibaba-provider-payment9002

同一个服务名下会出现两个实例

查看详情：

2.2.1测试

3.新建消费者模块cloudalibaba-consumer-nacos-order83

3.1pom文件加入依赖

<?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>cloud2020</artifactId>
        <groupId>com.cao.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloudalibaba-consumer-nacos-order83</artifactId>

    <dependencies>
        <!--SpringCloud ailibaba nacos -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!-- 引入自己定义的api通用包，可以使用Payment支付Entity -->
        <dependency>
            <groupId>com.cao.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <!-- SpringBoot整合Web组件 -->
        <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>
        <!--日常通用jar包配置-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

3.2yml写配置

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

##3.3主启动类

 package com.cao.springcloud.alibaba;

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);
    }
} 

3.3负载均衡

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;

/**
 * 负载均衡LoadBalanced
 */
@Configuration
public class ApplicationContextBean {
	@Bean
	@LoadBalanced
	public RestTemplate getRestTemplate() {
		return new RestTemplate();
	}
}

3.4controller

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;


/**
 * 消费者83调用提供者9001或者9002
 */
@RestController
public class OrderNacosController {
	@Resource
	private RestTemplate restTemplate;

	//将之前固定的写法转成从配置文件中读取
//    private static final String SERVICE_URL = "http://nacos-payment-provider";

	@Value("${service-url.nacos-user-service}")
	private String serverURL;

	@GetMapping("/consumer/payment/nacos/{id}")
	public String paymentInfo(@PathVariable("id") Long id) {
		return restTemplate.getForObject(serverURL + "/payment/nacos/" + id, String.class);
	}

}

4.测试

4.1同时启动9001、 9002、83

4.2查看注册中心

4.3用83访问9001/9002，轮询负载OK

http://localhost:83/consumer/payment/nacos/2