从spring boot到spring cloud（六）阿里nacos注册中心搭建

微服务注册中心现在常用的主流有三个

Nacos,Eureka与ZooKeeper

Nacos是阿里开源的，Nacos 支持基于 DNS 和基于 RPC 的服务发现。在Spring Cloud中使用Nacos，只需要先下载 Nacos 并启动 Nacos server，Nacos只需要简单的配置就可以完成服务的注册发现。

Nacos除了服务的注册发现之外，还支持动态配置服务。动态配置服务可以让您以中心化、外部化和动态化的方式管理所有环境的应用配置和服务配置。动态配置消除了配置变更时重新部署应用和服务的需要，让配置管理变得更加高效和敏捷。配置中心化管理让实现无状态服务变得更简单，让服务按需弹性扩展变得更容易。

Nacos = Spring Cloud注册中心 + Spring Cloud配置中心

进入正题，nacos下载 https://github/alibaba/nacos/releases?page=1

本地测试下载win版本的

解压后显示当前目录文件

通过bin目录下的startup.cmd直接启动，下载后直接启动会报错，因为默认模式是集群方式。在启动文件中做修改

startup.cmd中找到 set MODE="cluster" 修改为 set MODE="standalone"

然后启动

打开浏览器 http://本机ip:8848/nacos/index.html

帐号密码都是 nacos

这里单机版的nacos注册中心就完成了。

现在编写spring微服务

新建maven项目

项目目录

pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache/POM/4.0.0" xmlns:xsi="http://www.w3/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache/POM/4.0.0 https://maven.apache/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.13.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>cn.joral</groupId>
    <artifactId>nacos-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>nacos-server</name>
    <description>用户服务</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR5</spring-cloud.version>
        <spring-nacos.version>2.1.1.RELEASE</spring-nacos.version>
    </properties>
    <dependencies>
        <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>${spring-nacos.version}</version>
        </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>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

启动类 DemoApplication.java

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@EnableDiscoveryClient
public class DemoApplication {

	public static void main(String[] args) {
		SpringApplication.run(DemoApplication.class, args);
	}
	@RestController
    static class TestController {
 
        @GetMapping("/hello")
        public String hello(String name) {
            //log.info("name:{}", name);
            return "hello " + name;
        }
	}

}

application.yml

server:
  port: 8081
spring:
  application:
    name: nacos-server
  cloud:
    nacos:
      discovery:
        server-addr: 192.168.0.107:8848

启动以后再nacos里面就可以看到注册的服务了

在浏览器输入

http://192.168.0.107:8081/hello?name=word 192.168.0.107是本机ip

证明服务正常可以调用。

现在编写消费者

另外新建一个maven

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache/POM/4.0.0" xmlns:xsi="http://www.w3/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache/POM/4.0.0 https://maven.apache/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.13.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>cn.joral</groupId>
    <artifactId>jmall-userc</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>jmall-user</name>
    <description>客户端</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR5</spring-cloud.version>
        <spring-nacos.version>2.1.1.RELEASE</spring-nacos.version>
    </properties>

    <dependencies>
        <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>${spring-nacos.version}</version>
        </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>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

DemoApplication 启动类

package com.example.demo;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import lombok.extern.slf4j.Slf4j;

@SpringBootApplication
@EnableDiscoveryClient
public class DemoApplication {

	public static void main(String[] args) {
		SpringApplication.run(DemoApplication.class, args);
	}
	@Slf4j
	@RestController
	static class TestController{
 
		@Autowired
		LoadBalancerClient loadBalancerClient;
 
		
		@GetMapping("/test")
		public String test(){
			ServiceInstance serviceInstance = loadBalancerClient.choose("nacos-server");
			String url = serviceInstance.getUri() + "/hello?name=" + "zhangsan";
			RestTemplate restTemplate = new RestTemplate();
			String result = restTemplate.getForObject(url, String.class);
			return "url : " + url + ", return : " + result;
		}
	}

}

application.yml

server:
  port: 8080
spring:
  application: 
    name: nacos-client
  cloud:
    nacos:
      discovery:
        server-addr: 192.168.0.107:8848

启动服务

http://192.168.0.107:8080/test

调用成功。到此nacos就完成了。

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从spring boot到spring cloud（六）阿里nacos注册中心搭建

从spring boot到spring cloud（六）阿里nacos注册中心搭建

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