Nacos：1.Nacos的基本使用（一）服务注册与发现

怼烎@ 2022-11-17 13:50 255阅读 0赞

### 文章目录 ###

*  1.Nacos的安装与启动
 *  2.注册服务到Nacos Server
 *   *   *  本文示例源码：

# 1.Nacos的安装与启动 #

Nacos支持三种部署模式：单机、集群、多集群，要求使用JDK1.8以上版本。

Nacos的安装有两种方式：源码安装和使用编译好的安装包，这里演示源码安装方式。

# step.1 下载源码
    git clone  https://github.com/alibaba/nacos.git
    
    # step.2 进入根目录，执行构建命令
    mvn -Prelease-nacos clean install -U -Dmaven.test.skip=true
    # 这里使用-Dmaven.test.skip=true跳过单元测试的编译
    
    # step.3 进入distribution模块生成的target目录中，执行以下命令启动服务
    cd distribution/target/nacos-server-$version/nacos/bin
    sh startup.sh -m standalone

Nacos服务启动之后，可以通过[http://localhost:8848/nacos/\#/login][http_localhost_8848_nacos_login]访问Nacos的控制台，账户和密码是nacos/nacos，如下图所示：

![image][]

# 2.注册服务到Nacos Server #

1.  创建一个mvn空项目，命名为scanacos（随你自己起名），pom.xml配置如下填写：

pom.xml

<?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>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.3.5.RELEASE</version>
            <relativePath/> 
        </parent>
    
        <groupId>org.wy</groupId>
        <artifactId>scanacos</artifactId>
        <packaging>pom</packaging>
        <version>1.0-SNAPSHOT</version>
    
        <modules>
            <module>nacos-sample-provider</module>
            <module>nacos-sample-consumer</module>
        </modules>
    
        <properties>
            <java.version>1.8</java.version>
            <spring-cloud.version>2020.0.2</spring-cloud.version>
        </properties>
    
        <dependencies>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.1.1.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
    
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2.1.0.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
    
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-alibaba-nacos-discovery</artifactId>
                <version>0.9.0.RELEASE</version>
                <exclusions>
                    <exclusion>
                        <groupId>org.springframework.cloud</groupId>
                        <artifactId>spring-cloud-context</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
    
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter</artifactId>
                <version>2.1.1.RELEASE</version>
                <exclusions>
                    <exclusion>
                        <groupId>org.springframework.cloud</groupId>
                        <artifactId>spring-cloud-context</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-context</artifactId>
                <version>2.1.1.RELEASE</version>
            </dependency>
    
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

1.  创建第一个module：nacos-sample-provider，pom.xml配置如下填写：

pom.xml

1.  nacos-sample-provider代码和配置如下：

【NacosSampleProviderApplication.java】

package org.wy.provider;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    
    @SpringBootApplication
    @EnableDiscoveryClient
    public class NacosSampleProviderApplication { 
    
        public static void main(String[] args) { 
            SpringApplication.run(NacosSampleProviderApplication.class, args);
        }
    }

【HelloServiceImpl.java】

package org.wy.provider;
    
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class HelloServiceImpl { 
    
        @GetMapping(value = "/hi")
        public String sayHello(@RequestParam(name = "name") String name) { 
            return "Hello World: " + name;
        }
    }

【application.yml】

# nacos服务注册中心信息参数
    nacos:
     instance:
       hostname: localhost
       port: 8848
    
    spring:
     cloud:
       nacos:
         discovery:
           # 服务注册中心地址
           server-addr: ${ nacos.instance.hostname}:${ nacos.instance.port}
     application:
       # 服务名，对应service-id
       name: nacos-sample-provider
    
    # 该服务启动后使用的端口
    server:
     port: 8001

1.  创建第二个module：nacos-sample-consumer，pom.xml配置如下填写：

pom.xml

1.  nacos-sample-consumer代码和配置如下：

【NacosSampleConsumerApplication.java】

package org.wy.consumer;
    
    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
    @EnableFeignClients
    public class NacosSampleConsumerApplication { 
    
        public static void main(String[] args) { 
            SpringApplication.run(NacosSampleConsumerApplication.class, args);
        }
    }

【ProviderFeign.java】

package org.wy.consumer;
    
    import org.springframework.cloud.openfeign.FeignClient;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    
    @FeignClient("nacos-sample-provider")
    public interface ProviderFeign { 
        @GetMapping("/hi")
        String sayHello(@RequestParam(name = "name") String name);
    }

【ConsumerController.java】

package org.wy.consumer;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class ConsumerController { 
    
        @Autowired
        private ProviderFeign providerFeign;
    
        @GetMapping("/openfeign/hi")
        public String sayHello(@RequestParam(name = "name") String name) { 
            return providerFeign.sayHello(name);
        }
    }

配置文件【application.yml】

# nacos服务注册中心信息参数
    nacos:
     instance:
       hostname: localhost
       port: 8848
    
    spring:
     cloud:
       nacos:
         discovery:
           # 服务注册中心地址
           server-addr: ${ nacos.instance.hostname}:${ nacos.instance.port}
     application:
       # 服务名，对应service-id
       name: nacos-sample-consumer
    
    # 该服务启动后使用的端口
    server:
     port: 8002

1.  启动两个服务，调用一下url，验证服务是否正常

[http://localhost:8001/hi?name=test][http_localhost_8001_hi_name_test]

![image][image 1]

[http://localhost:8002/openfeign/hi?name=test][http_localhost_8002_openfeign_hi_name_test]

![image][image 2]

1.  查看Nacos控制台，也可以看到两个服务已经注册进来了

![image][image 3]

--------------------

### 本文示例源码： ###

[GitHub：WangYe8613/scanacos][GitHub_WangYe8613_scanacos]

\[commit id：5bb8995ee0746353f1bd4535bfcf7f94455cc668\]

[http_localhost_8848_nacos_login]: http://localhost:8848/nacos/#/login
[image]: /images/20221022/ffec6d4b752b46d89b28bc332ad28bcc.png
[http_localhost_8001_hi_name_test]: http://localhost:8001/hi?name=test
[image 1]: /images/20221022/cd2056ca8d6647a3a3458c793610f3c1.png
[http_localhost_8002_openfeign_hi_name_test]: http://localhost:8002/openfeign/hi?name=test
[image 2]: /images/20221022/7be31750a0414a378ee556851ad27eab.png
[image 3]: /images/20221022/8c02d929945349c88d821f28ccf34130.png
[GitHub_WangYe8613_scanacos]: https://github.com/WangYe8613/scanacos.git