Nacos应用

• Nacos应用
• • 快速入门
• Nacos服务发现
• • • restFul风格
  • 负载均衡
  • Dubbo风格

Nacos应用

快速入门

1. 创建父工程

• 导入相关坐标

<dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.1.3.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

2. 创建子工程(nacos-restful-provider)

• 导入 相关 坐标

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

• 创建 controller层

@RestController
public class RestProviderController {
    @GetMapping(value = "service")
    public String service() {
        return "provider invoke";
    }
}

• 书写启动类

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

• 书写.yml配置文件

server:
  port: 56010

3. 创建子工程 (nacos-restful-consumer)

• 创建controller层

@RestController
public class RestConsumerController {
    @Value("${provider.address}")
    private String providerAddress;
    @GetMapping("service1")
    public String service() {
        RestTemplate restTemplate = new RestTemplate();
        //调用服务
        String providerResult = restTemplate.getForObject("http://" + providerAddress + "/service", String.class);
        return "consumer invoke | " + providerResult;
    }
}

• 书写启动类

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

• 书写配置文件

server:
  port: 56020
provider:
  address: 127.0.0.1:56010

直接访问：http://127.0.0.1:56020/service1

Nacos服务发现

restFul风格

1. 父工程导入相关 坐标

<dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.1.3.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.1.3.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Greenwich.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>
        </dependencies>
    </dependencyManagement>

2. 连个子工程里面导入相关坐标

<!--导入nacos坐标-->
  <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

负载均衡

只需要在消费 者配置文件中 加入

nacos-restful-provider:
  ribbon:
    NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule

Dubbo风格

1. 在父工程下面创建一个service2工程
2. service2工程下面创建两个子工程service2-api,service2-server
3. service-server导入相关坐标

 <dependency>
            <groupId>cn.nacos</groupId>
            <artifactId>service2-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-dubbo</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpcore</artifactId>
        </dependency>

4. service2-api中创建 接口

public interface Service2Api {
    public String dubboService2();
}

5. 在service2-server中书写实现类

@Service
public class Service2ApiImpl implements Service2Api{
    @Override
    public String dubboService2() {
        return "You're an idiot.";
    }
}

6. 在service2-server中书写启动类

@SpringBootApplication
@EnableDiscoveryClient
public class Service2Bootstrap {
    public static void main(String[] args) {
        SpringApplication.run(Service2Bootstrap.class,args);
    }
}

7. 在nacos-restful-consumer中测试

• 导入相关坐标

 <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-dubbo</artifactId>
        </dependency>
        <dependency>
            <groupId>cn.nacos</groupId>
            <artifactId>service2-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

• 书写实现类

public class RestConsumerController {
    @Reference
    private Service2Api service2Api;

    @GetMapping(value = "/service2")
    public String service2() {
        //远程调用service2
        String providerResult = service2Api.dubboService2();
        return "consumer dubbo invoke | " + providerResult;
    }
}