Spring cloud集成 Nacos实现服务注册与发现

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抹香鲸之海 2022-12-08 16:12:20 ©著作权

文章标签 spring cloud rabbitmq spring ide maven 文章分类 前端开发

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Nacos服务注册与发现

Centos7下Nacos安装和部署

spring cloud集成 NACOS配置中心实现动态配置

服务模块之间本来是互相独立的不能相互访问 Nacos提供的注册服务，可以支持他们互相调用

1.启动nacos：

Spring cloud集成 Nacos实现服务注册与发现_maven

2.创建Maven工程：

我的工程结构如下：

Spring cloud集成 Nacos实现服务注册与发现_spring cloud_02

Maven父工程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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.naixin</groupId>
  <artifactId>lgn-cloud</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>springcloud-lgn</name>
  <description>搭建springcloudalibaba 第一版</description>

  <packaging>pom</packaging>

  <properties>
    <java.version>1.8</java.version>
  </properties>

</project>

3.创建服务提供者模块

目录结构：

Spring cloud集成 Nacos实现服务注册与发现_ide_03

nacos服务提供者模块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 https://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>2.1.4.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>
  <groupId>com.naixin</groupId>
  <artifactId>nacos-publisher</artifactId>
  <version>1.0</version>

  <name>nacos-provider</name>

  <description>nacos服务提供者模块</description>

  <properties>
    <java.version>1.8</java.version>
    <spring-cloud.version>Greenwich.RELEASE</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-starter-test</artifactId>
      <scope>test</scope>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-alibaba-nacos-discovery -->
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
      <version>0.9.0.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>
    <!--lombok-->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.14</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>org.testng</groupId>
      <artifactId>testng</artifactId>
      <version>RELEASE</version>
      <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>

程序的启动端口为8011，应用名为nacos-providerr，向nacos server注册的地址为192.168.8.150:8848。

application.yml:

server:
  port: 8011
spring:
  application:
    name: nacos-provider
  cloud:
    nacos:
      discovery:
        server-addr: 192.168.8.150:8848 #服务发现地址

启动类：NacosProviderApplication:

然后在Spring Boot的启动文件NacosProviderApplication加上@EnableDiscoveryClient注解，代码如下：

package com.naixin.nacosPor;

import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.core.env.Environment;

import java.net.InetAddress;

/**
 * nacos服务提供者
 */
@SpringBootApplication
@EnableDiscoveryClient //@EnableDiscoveryClient都是能够让注册中心能够发现，扫描该该服务。
@Slf4j
public class NacosProviderApplication {

  public static void main(String[] args) throws Exception {

    ConfigurableApplicationContext application = SpringApplication.run(NacosProviderApplication.class, args);

    Environment env = application.getEnvironment();
    log.info("\n----------------------------------------------------------\n\t" +
            "Application '{}' is running! Access URLs:\n\t" +
            "Login: \thttp://{}:{}/\n\t" +
            "----------------------------------------------------------",
        env.getProperty("spring.application.name"),
        InetAddress.getLocalHost().getHostAddress(),
        env.getProperty("server.port"),
        InetAddress.getLocalHost().getHostAddress(),
        env.getProperty("server.port"));


    System.out.println("╭フ哇、內誰說↘生活萁拾狠简单濄勒今天鹫是明天⊕_⊙");
  }

}

Controller类，ProviderController：

package com.naixin.nacosPor.web.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * rabbitMq 服务提供者
 * Created by liangguannan on 2021/10/26.
 */
@RestController
@RequestMapping("/nacosProvider")
public class ProviderController {

    @RequestMapping("/getNacosInfo")
    public String getNacosInfo() {
        return "输出一下：nacos 服务提供者！";
    }


}

customer模块同理

application.yml:注意端口号不要冲突：

nacos服务提供者模块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 https://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>2.1.4.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>
  <groupId>com.naixin</groupId>
  <artifactId>nacos-customer</artifactId>

  <version>1.0</version>

  <name>nacos-customer</name>

  <description>nacos 消费者</description>

  <properties>
    <java.version>1.8</java.version>
    <spring-cloud.version>Greenwich.RELEASE</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-starter-test</artifactId>
      <scope>test</scope>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-alibaba-nacos-discovery -->
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
      <version>0.9.0.RELEASE</version>
    </dependency>

    <!-- spring-cloud-starter-ribbon提供客户端的软件负载均衡算法-->
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-ribbon</artifactId>
      <version>1.4.7.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-openfeign</artifactId>
      <version>2.2.0.RELEASE</version>
    </dependency>

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

    <!--lombok-->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.14</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>org.testng</groupId>
      <artifactId>testng</artifactId>
      <version>RELEASE</version>
      <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>

工程结构：

Spring cloud集成 Nacos实现服务注册与发现_ide_04

服务消费模块NacosCustomerApplication：

package com.naixin.nacosPor;

import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.core.env.Environment;

import java.net.InetAddress;

/**
 * nacos服务消费方
 */
@SpringBootApplication
@EnableDiscoveryClient //@EnableDiscoveryClient都是能够让注册中心能够发现，扫描该该服务。
@Slf4j
@EnableFeignClients("com.naixin.nacosPor.web.service") //添加注解@EnableFeignClients开启OpenFeign 如果不写包名默认找启动类包下面的feignClient
public class NacosCustomerApplication {

  public static void main(String[] args) throws Exception {

    ConfigurableApplicationContext application = SpringApplication.run(NacosCustomerApplication.class, args);

    Environment env = application.getEnvironment();
    log.info("\n----------------------------------------------------------\n\t" +
            "Application '{}' is running! Access URLs:\n\t" +
            "Login: \thttp://{}:{}/\n\t" +
            "----------------------------------------------------------",
        env.getProperty("spring.application.name"),
        InetAddress.getLocalHost().getHostAddress(),
        env.getProperty("server.port"),
        InetAddress.getLocalHost().getHostAddress(),
        env.getProperty("server.port"));


    System.out.println("╭フ哇、內誰說↘生活萁拾狠简单濄勒今天鹫是明天⊕_⊙");
  }

}

服务消费者是通过两种方式进行服务调用！
方式1：
RestTemplate+Ribbon的方式来进行服务调用的。
CustomerController：

package com.naixin.nacosPor.web.controller;

import com.naixin.nacosPor.web.config.HttpUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

/**
 * rabbitMq 服务消费者
 * Created by liangguannan on 2021/10/26.
 */
@RestController
@RequestMapping("/nacosCustomer")
public class CustomerController {

    /**
     * 使用使用restTemplate方式
     * @return
     */
    @RequestMapping(value = "/getNacosInfo", method = RequestMethod.GET)
    public String getNacosInfo() {
        HttpUtils httpUtils=new HttpUtils();//服务消费者是通过RestTemplate+Ribbon的方式来进行服务调用的。
        return httpUtils.restTemplate().getForObject("http://nacos-provider/nacosProvider/getNacosInfo", String.class);
    }
}

HttpUtils：

package com.naixin.rabbitmq.web.config;

import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

/**
 * Http请求工具类
 * @author lgn
 * @version 1.0
 * @date 2021/10/26 16:43
 */
public class HttpUtils {
    /**
     * 使用spring框架，可以使用restTemplate来进行http连接请求
     * @return
     */
    @LoadBalanced //负载均衡(该注解标记使用哪种负载均衡策略，服务名访问必须使用)
    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

}

方式2：
通过feign，建里CustomerFeignController：

package com.naixin.nacosPor.web.controller;

import com.naixin.nacosPor.web.service.CustomerService;
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;

/**
 * @author lgn
 * @version 1.0
 * @date 2021/10/27 14:32
 */
@RestController
@RequestMapping("/nacosCustomer")
public class CustomerFeignController {

    @Autowired
    private CustomerService customerService;

    /**
     * 使用使用FeignClient方式
     * @return
     */
    @GetMapping("/feign")
    public String feignTest() {
        return customerService.helloNacos();
    }
}

CustomerService：

package com.naixin.nacosPor.web.service;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;

/**
 * @author lgn
 * @version 1.0
 * @date 2021/10/27 14:14
 */
@FeignClient("nacos-provider")//服务提供者的服务名
public interface CustomerService {

    @GetMapping("nacosProvider/getNacosInfo")//服务提供者的接口名
    String helloNacos();
}

注册

服务者消费者服务均运行起来，可以看到在nacos里看到这两个服务已经注册成功：

Spring cloud集成 Nacos实现服务注册与发现_rabbitmq_05

Spring cloud集成 Nacos实现服务注册与发现_rabbitmq_06

服务调用

nacos作为服务注册和发现组件时，在进行服务消费，可以选择RestTemplate和Feign等方式。这和使用Eureka和Consul作为服务注册和发现的组件是一样的，没有什么区别。这是因为spring-cloud-starter-alibaba-nacos-discovery依赖实现了Spring Cloud服务注册和发现的相关接口，可以和其他服务注册发现组件无缝切换。

访问一下接口：

Spring cloud集成 Nacos实现服务注册与发现_maven_07