[Alibaba微服务技术入门]_服务的注册_第2讲

Spring Cloud Alibaba Nacos Discovery

服务注册：通过 spring-cloud-starter-alibaba-nacos-discovery 自动配置为Spring Boot应用程序在服务注册与发现方面提供和Nacos的无缝集成，在通过一些简单的注解，就可以快速的实现服务注册与发现

搭建项目环境

1、创建项目父工程，名称：alibaba2，父工程的pom.xml文件代码如下

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <modules>
        <module>1-nacos-provider9001</module>
    </modules>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.2.RELEASE</version>
        <relativePath/>
    </parent>

    <groupId>com.liuyangjava</groupId>
    <artifactId>alibaba</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>pom</packaging>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Hoxton.SR8</spring-cloud.version>
        <spring-cloud-alibaba.version>2.2.5.RELEASE</spring-cloud-alibaba.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <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>
    </dependencies>


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

</project>

2、创建 1-nacos-provider9001 子工程，即：编写一个服务提供者

（1）向 pom.xml 文件中加入 spring-cloud-starter-alibaba-nacos-discovery 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>alibaba</artifactId>
        <groupId>com.liuyangjava</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.liuyangjava</groupId>
    <artifactId>1-nacos-provider9001</artifactId>

    <dependencies>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
    </dependencies>

</project>

（2）创建 application.yml 文件，配置服务端口号；注册中心地址；应用程序名称

server:
  port: 9001

spring:
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
  application:
    name: nacos-provider

management:
  endpoints:
    web:
      exposure:
        include: '*'

（3）创建 NacosProvider9001 启动类，添加  @SpringBootApplication；@EnableDiscoveryClient 注解，启动应用程序

package com.liuyangjava;

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

@SpringBootApplication
@EnableDiscoveryClient
public class NacosProvider9001 {
    public static void main(String[] args) {
        SpringApplication.run(NacosProvider9001.class, args);
    }
}

 注：后台提示 nacos registry, DEFAULT_GROUP nacos-provider9001 192.168.9.5:9001 register finished，则表示此应用程序成功注册到 Nacos 服务中

 最后，打开Nacos的后台，可以查看服务是否注册成功

 

（4）创建 NacosProviderController 

package com.liuyangjava.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class NacosProviderController {

    @Value("${server.port}")
    private String port;

    @GetMapping("/nacos/provider")
    public String getInfo() {
        return "nacos register, server port: " + port;
    }

}