spring cloud alibaba - Nacos 作为注册中心基础使用-服务提供者和消费者

1.概况

　　服务提供者9001和9002，他们是同一个服务，服务消费者83

2.创建服务提供者

　　9001和9002除了端口是一样的，这里只演示一个

2.1项目结构

2.2依赖

nacos依赖

<dependency>

            <groupId>com.alibaba.cloud</groupId>

            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>

        </dependency>

完整的

<dependencies>

        <dependency>

            <groupId>com.alibaba.cloud</groupId>

            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>

        </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>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-devtools</artifactId>

            <scope>runtime</scope>

            <optional>true</optional>

        </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>

        <dependency>

            <groupId>com.alibaba</groupId>

            <artifactId>fastjson</artifactId>

            <version>1.2.62</version>

        </dependency>

    </dependencies>

2.3配置文件

server:

  port: 9001

spring:

  application:

    name: nacos-payment-provider  #将会作为注册到注册中心的服务名称

  cloud:

    nacos:

      discovery:

        server-addr: localhost:8848 #配置Nacos地址

management:

  endpoints:

    web:

      exposure:

        include: '*'

2.4主启动类

　　注解使用的是@EnableDiscoveryClient

package com.atguigu.springcloud;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

/**

 * @Classname PaymentMain9001

 * @Description TODO

 * @Date 2021/6/18 0018 下午 2:20

 * @Created by jcc

 */

@SpringBootApplication

@EnableDiscoveryClient

public class PaymentMain9001 {

    public static void main(String[] args) {

        SpringApplication.run(PaymentMain9001.class,args);

    }

}

2.5业务类

package com.atguigu.springcloud.controller;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.PathVariable;

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

/**

 * @Classname PaymentController

 * @Description TODO

 * @Date 2021/6/18 0018 下午 2:21

 * @Created by jcc

 */

@RestController

public class PaymentController {

    @Value("${server.port}")

    private String serverPort;

    @GetMapping(value = "/payment/nacos/{id}")

    public String getPayment(@PathVariable("id") Integer id)

    {

        return "nacos registry, serverPort: "+ serverPort+"\t id"+id;

    }

}

3.创建服务消费者

3.1项目结构

3.2依赖

<dependency>

            <groupId>com.alibaba.cloud</groupId>

            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>

        </dependency>

完整

<dependencies>

        <dependency>

            <groupId>com.alibaba.cloud</groupId>

            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>

        </dependency>

        <dependency>

            <groupId>com.atguigu.springcloud</groupId>

            <artifactId>cloud-api-commons</artifactId>

            <version>${project.version}</version>

        </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>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-devtools</artifactId>

            <scope>runtime</scope>

            <optional>true</optional>

        </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>

        <dependency>

            <groupId>com.alibaba</groupId>

            <artifactId>fastjson</artifactId>

            <version>1.2.62</version>

        </dependency>

    </dependencies>

3.3配置文件

server:

  port: 83

spring:

  application:

    name: nacos-payment-consumer  #将会作为注册到注册中心的服务名称

  cloud:

    nacos:

      discovery:

        server-addr: localhost:8848 #配置Nacos地址

service-url:

  nacos-user-service: http://nacos-payment-provider

3.4主启动类

package com.atguigu.springcloud.alibaba.controller;

import lombok.extern.slf4j.Slf4j;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.PathVariable;

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

import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

/**

 * @Classname OrderNacosController

 * @Description TODO

 * @Date 2021/6/18 0018 下午 2:58

 * @Created by jcc

 */

@RestController

@Slf4j

public class OrderNacosController {

    @Resource

    private RestTemplate restTemplate;

    @Value("${service-url.nacos-user-service}")

    private String serverURL;

    @GetMapping(value = "/consumer/payment/nacos/{id}")

    public String paymentInfo(@PathVariable("id") Long id) {

        return restTemplate.getForObject(serverURL+"/payment/nacos/"+id,String.class);

    }

}

3.5配置类和业务类

nacos集成了Ribbon

package com.atguigu.springcloud.alibaba.config;

import org.springframework.cloud.client.loadbalancer.LoadBalanced;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.web.client.RestTemplate;

/**

 * @Classname ApplicationContextConfig

 * @Description TODO

 * @Date 2021/6/18 0018 下午 2:56

 * @Created by jcc

 */

@Configuration

public class ApplicationContextConfig {

    @Bean

    @LoadBalanced  //nacos集成了Ribbon，这里是开启ribbon负载均衡

    public RestTemplate getRestTemplate()

    {

        return new RestTemplate();

    }

}

package com.atguigu.springcloud.alibaba.controller;

import lombok.extern.slf4j.Slf4j;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.PathVariable;

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

import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

/**

 * @Classname OrderNacosController

 * @Description TODO

 * @Date 2021/6/18 0018 下午 2:58

 * @Created by jcc

 */

@RestController

@Slf4j

public class OrderNacosController {

    @Resource

    private RestTemplate restTemplate;

    @Value("${service-url.nacos-user-service}")

    private String serverURL;

    @GetMapping(value = "/consumer/payment/nacos/{id}")

    public String paymentInfo(@PathVariable("id") Long id) {

        return restTemplate.getForObject(serverURL+"/payment/nacos/"+id,String.class);

    }

}

4.启动三个服务

　　启动后，查看nacos管理页面，可以看到三个服务

　　此时，访问服务消费者83，连续访问

　　http://localhost:83/consumer/payment/nacos/13

　　连续访问，发现 9001和9002轮询提供服务，因为Ribbon默认的策略是轮询

　　关于ribbon的介绍：https://www.cnblogs.com/jthr/p/14694632.html

巴特西

spring cloud alibaba - Nacos 作为注册中心基础使用-服务提供者和消费者

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