保姆教程系列二、Nacos实现注册中心

前言：

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上篇我们介绍到  保姆教程系列一、Linux搭建Nacos 

注册中心原理

一、环境准备

• Java版本：1.8+   (Linux centos7虚拟机下安装Jdk1.8)
• MySQL服务：5.6.5+   (Linux Centos7 安装MySQL5.7 图文详解)

二、创建项目

2.1 创建项目父工程

IDEA中创建聚合项目nacos作为父工程,其pom.xml如下

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <!--SpringBoot版本-->    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>2.3.3.RELEASE</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>    <groupId>com.example</groupId>    <artifactId>nacos</artifactId>    <version>0.0.1</version>    <name>nacos</name>    <description>Spring Cloud Nacos</description>    <properties>        <java.version>1.8</java.version>    </properties>    <!--引入子模块-->    <modules>        <module>provider</module><!--生产者-->        <module>consumer</module><!--消费者-->    </modules>    <dependencies>        <!--web依赖-->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <!--测试依赖-->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>        <!--nacos配置中心依赖-->        <dependency>            <groupId>com.alibaba.cloud</groupId>            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>            <version>2.1.1.RELEASE</version>        </dependency>        <!--nacos配置中心依赖-->        <!--<dependency>-->            <!--<groupId>org.springframework.cloud</groupId>-->            <!--<artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>-->            <!--<version>0.2.1.RELEASE</version>-->        <!--</dependency>-->        <!--lombok依赖-->        <dependency>            <groupId>org.projectlombok</groupId>            <artifactId>lombok</artifactId>            <optional>true</optional>        </dependency>        <!--注册中心依赖-->        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>            <version>0.2.2.RELEASE</version>        </dependency>    </dependencies>    <build>        <plugins>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>            </plugin>        </plugins>    </build>    <dependencyManagement>        <dependencies>            <dependency>                <groupId>org.springframework.cloud</groupId>                <artifactId>spring-cloud-dependencies</artifactId>                <version>Greenwich.SR2</version>                <type>pom</type>                <scope>import</scope>            </dependency>        </dependencies>    </dependencyManagement></project>

2.2 创建Provider服务生产者

在父工程Nacos下创建springboot子工程provider，其pom.xml文件为：

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <!--父工程-->    <parent>        <groupId>com.example</groupId>        <artifactId>nacos</artifactId>        <version>0.0.1</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>    <groupId>com.example</groupId>    <artifactId>provider</artifactId>    <version>0.0.1</version>    <name>provider</name>    <description>Provider Nacos</description>    <properties>        <java.version>1.8</java.version>    </properties>    <dependencies>        <!--lombok依赖-->        <dependency>            <groupId>org.projectlombok</groupId>            <artifactId>lombok</artifactId>            <optional>true</optional>        </dependency>    </dependencies>    <build>        <plugins>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>            </plugin>        </plugins>    </build></project>

在启动类ProviderApplication.java中增加@EnableDiscoveryClient注解

import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;@SpringBootApplication@EnableDiscoveryClient//开启注册public class ProviderApplication {    public static void main(String[] args) {        SpringApplication.run(ProviderApplication.class, args);    }}

配置文件application.yml进行如下配置

#生产者配置server:  port: 8081spring:  application:    name: nacos-provider #服务名称  cloud:    nacos:      discovery:  #使用注册中心        server-addr: 192.168.36.135:8848 #Nacos访问地址        enabled: true

在服务提供方创建一个对外接口

import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RequestMapping("/provider")@RestControllerpublic class IndexController {    @GetMapping("/hello")    public String hello() {        return "我是provider服务生产者";    }}

2.3 创建Consumer服务消费者

在父工程Nacos下创建springboot子工程consumer，其pom.xml文件为：

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <!--父工程-->    <parent>        <groupId>com.example</groupId>        <artifactId>nacos</artifactId>        <version>0.0.1</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>    <groupId>com.example</groupId>    <artifactId>consumer</artifactId>    <version>0.0.1</version>    <name>consumer</name>    <description>Consumer Nacos</description>    <properties>        <java.version>1.8</java.version>    </properties>    <dependencies>        <!--feign依赖-->        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-openfeign</artifactId>        </dependency>        <!--hystrix断路器-->        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>        </dependency>    </dependencies>    <build>        <plugins>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>            </plugin>        </plugins>    </build></project>

在启动类ConsumerApplication.java中增加注解

import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;import org.springframework.cloud.openfeign.EnableFeignClients;@SpringBootApplication@EnableDiscoveryClient //开启注册@EnableFeignClients //开启Feign服务public class ConsumerApplication {    public static void main(String[] args) {        SpringApplication.run(ConsumerApplication.class, args);    }}

配置文件application.yml进行如下配置

#消费者配置server:  port: 8082spring:  application:    name: nacos-consumer  cloud:    nacos:      discovery:  #使用注册中心        server-addr: 192.168.36.135:8848        enabled: true#开启断路器feign: hystrix:   enabled: true

使用FeginClient进行服务调用,hystrix进行熔断

import com.example.consumer.hystrix.HystrixUtils;import org.springframework.cloud.openfeign.FeignClient;import org.springframework.web.bind.annotation.GetMapping;@FeignClient(name = "nacos-provider",fallback = HystrixUtils.class)//服务出现异常进行容错public interface ProviderFeignClient {    /**     * .     * 调用生产者服务     * @return     */    @GetMapping("/provider/hello")    String hello();}

HystrixUtils.class容错类

import com.example.consumer.client.ProviderFeignClient;import org.springframework.stereotype.Component;@Componentpublic class HystrixUtils implements ProviderFeignClient {    /**     * .     * 方法重写     *     * @return     */    @Override    public String hello() {        return "断路器容错,服务开小差了，稍等片刻...";    }}

service层服务调用

import com.example.consumer.client.ProviderFeignClient;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;@Servicepublic class IndexService {    @Autowired    private ProviderFeignClient client; //注入    public String hello() {        return client.hello(); // 服务调用    }}

在controller中调用service的接口,像一般的接口调用一样

import com.example.consumer.service.IndexService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RequestMapping("/consumer")@RestControllerpublic class IndexController {    @Autowired    private IndexService service;    @GetMapping("/hello")    public String hello(){          return service.hello();    }}

三、服务调用测试

3.1 项目启动

启动完成后，在服务提供者和消费者的日志中应该可以分别看到如下信息

INFO 18388 --- [           main] o.s.c.a.n.registry.NacosServiceRegistry  : nacos registry, nacos-provider 192.168.22.1:8081 register finished

3.2 登录Nacos控制台

你会发现服务列表中，已经显示了我们刚才创建的两个项目，并可以对其进行简单的监控和管理。

3.3 使用样例项目

打开浏览器输入：http://localhost:8082/consumer/hello     

 

 

 

 

 

 Nacos服务发现与Eureak服务发现无差异

 敬请关注下篇 保姆教程系列三、Nacos Config–服务配置中心

 总结：

我是南国以南i记录点滴每天成长一点点，学习是永无止境的！转载请附原文链接！！！

 参考链接