基于Dubbo和Nacos搭建微服务的配置中心和服务注册中心

1.SpringCloud Alibaba接入Nacos&restTemplate

1.添加nacos依赖

<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    <version>${latest.version}</version>
</dependency>

2.配置application.properties

spring:
  application:
    name: {应用名称}
  cloud:
    nacos:
      discovery:
        server-addr: 111.52.99.114:18848
        username: nacos
        password: nacos

PS：nacos2.0除了需要8848的端口之外，还新增了端口+1000的新端口用于客户端和服务端GRPC通信的端口，所以如果是自己部署的nacos需要放开这俩个端口，服务才可以启动成功。

3.配置类

3.1 添加Spring Cloud原生注解 @EnableDiscoveryClient

3.2 客户端服务使用@LoadBalanced做负载均衡调用

@LoadBalanced
@Bean
public RestTemplate restTemplate(){
    return new RestTemplate();
}

PS:使用@LoadBalanced需要引入负载均衡器的实现才能生效。

<dependency>
 <groupId>org.springframework.cloud</groupId>
 <artifactId>spring-cloud-starter-loadbalancer</artifactId>
</dependency>

3.3 通过restTemplate调用

@RequestMapping(value = "mappingURL", method = RequestMethod.GET)
public String echo(@PathVariable String str) {
    return restTemplate.getForObject("http://{服务提供者-服务名}/echo/" + str, String.class);
}

4.nacos控制台

服务注册成功，nacos控制台可以看到服务列表，服务调用正常。如图：

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2.Dubbo2.7集成Nacos2.0

1.添加依赖

<dependency>
    <groupId>org.apache.dubbo</groupId>
    <artifactId>dubbo</artifactId>
    <version>2.7.15</version>
</dependency>
<dependency>
    <groupId>org.apache.dubbo</groupId>
    <artifactId>dubbo-spring-boot-starter</artifactId>
    <version>2.7.15</version>
</dependency>
<dependency>
    <groupId>com.alibaba.nacos</groupId>
    <artifactId>nacos-client</artifactId>
    <version>2.0.2</version>
</dependency>

2.Dubbo&Nacos配置

dubbo:
  application:
    version: 1.0.0
    name: service-provider
  registry:
    address: nacos://111.52.99.114:18848?username=nacos&password=nacos
  protocol:
    name: dubbo
    port: -1
  provider:
    timeout: 30000

💖：对于需要认证的nacos，使用url拼接用户名密码。

3.启动类注解

@EnableDubbo(scanBasePackages = "cn.bingo.lottery")
@SpringBootApplication
public class DempApplication {
    public static void main(String[] args) {
        SpringApplication.run(DempApplication.class,args);
    }
}

4.服务导出和服务引用

//服务导出
@DubboService(version = "1.0.0",interfaceClass = IActivityBooth.class,retries = 0)
public class ActivityBooth implements IActivityBooth {

}
//服务引用
@DubboReference(version = "1.0.0",timeout =3000 )
private IActivityBooth activityBooth;

5.控制台服务列表

服务注册成功，nacos控制台可以看到服务列表，服务调用正常。如图：

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3.SpringCloud Alibaba接入Nacos&Dubbo

1.添加nacos依赖

<dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-dubbo</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>com.alibaba.nacos</groupId>
                    <artifactId>nacos-client</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.apache.dubbo</groupId>
                    <artifactId>dubbo</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>com.alibaba.nacos</groupId>
                    <artifactId>nacos-client</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo</artifactId>
            <exclusions>
                <exclusion>
                    <artifactId>spring-context</artifactId>
                    <groupId>org.springframework</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>com.alibaba.nacos</groupId>
            <artifactId>nacos-client</artifactId>
        </dependency>

2.配置application.properties

dubbo.application.name=service-provider
dubbo.scan.base-packages=cn.service.test.api

spring:
  application:
    name: {应用名称}
  cloud:
    nacos:
      discovery:
        server-addr: 111.52.99.114:18848
        username: nacos
        password: nacos

3.服务导出和服务引用

//服务引用
@DubboReference(version = "1.0.0",retries = 0)
private ProductApi productApi;
//服务导出
@DubboService(version = "1.0.0",interfaceClass = ProductApi.class,retries = 0)
@Slf4j
public class ProductApiImpl  implements ProductApi {}

4.nacos控制台

可以看到这种接入，dubbo2.0的接口级对齐了springcloud的服务级。

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