服务提供者
创建一个名为 hello-dubbo-nacos-provider
的服务提供者项目
POM
<?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>2.1.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.antoniopeng</groupId>
<artifactId>hello-dubbo-nacos-provider</artifactId>
<packaging>pom</packaging>
<modules>
<module>hello-dubbo-nacos-provider-api</module>
<module>hello-dubbo-nacos-provider-service</module>
</modules>
</project>
该项目下有两个子模块,分别是 hello-dubbo-nacos-provider-api
和 hello-dubbo-nacos-provider-service
,前者用于定义接口,后者用于实现接口。
服务提供者接口模块
在服务提供者项目下创建一个名为 hello-dubbo-nacos-provider-api
的模块, 该项目模块只负责 定义接口
POM
<?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>com.antoniopeng</groupId>
<artifactId>hello-dubbo-nacos-provider</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<artifactId>hello-dubbo-nacos-provider-api</artifactId>
<packaging>jar</packaging>
</project>
定义一个接口
public interface EchoService {
String echo(String string);
}
服务提供者接口实现模块
创建名为 hello-dubbo-nacos-provider-service
服务提供者接口的实现模块,用于实现在接口模块中定义的接口。
引入依赖
在 pom.xml
中主要添加以下依赖
<!-- Nacos And Dubbo-->
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo</artifactId>
</dependency>
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-serialization-kryo</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo-registry-nacos</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba.nacos</groupId>
<artifactId>nacos-client</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba.spring</groupId>
<artifactId>spring-context-support</artifactId>
</dependency>
<!-- 依赖接口模块,用于实现接口 -->
<dependency>
<groupId>com.antoniopeng</groupId>
<artifactId>hello-dubbo-nacos-provider-api</artifactId>
<version>${project.parent.version}</version>
</dependency>
相关配置
在 application.yml
中加入相关配置
spring:
application:
name: dubbo-nacos-provider
main:
allow-bean-definition-overriding: true
dubbo:
scan:
# 接口扫描路径
base-packages: com.antoniopeng.hello.dubbo.nacos.provider.service
protocol:
name: dubbo
# -1 代表自动分配端口
port: -1
# 配置高速序列化规则
serialization: kryo
registry:
# 服务注册地址,也就是 Nacos 的服务器地址
address: nacos://192.168.127.132:8848
provider:
# 配置负载均衡策略(轮询)
loadbalance: roundrobin
附:Duubo 负载均衡策略
- random:随机
- roundrobin:轮询
- leastactive:最少活跃数
- consistenthash:一致性 Hash
实现接口
通过 org.apache.dubbo.config.annotation
包下的 @Service
注解将接口暴露出去
import com.antoniopeng.hello.dubbo.nacos.provider.api.EchoService;
import org.apache.dubbo.config.annotation.Service;
@Service(version = "1.0.0")
public class EchoServiceImpl implements EchoService {
@Override
public String echo(String string) {
return "Echo Hello Dubbo " + string;
}
}
注意:@Service 注解要注明 version 属性
验证是否成功
启动项目,通过浏览器访问Nacos Server 网址 http://192.168.127.132:8848/nacos ,会发现有一个服务已经注册在服务列表中。
服务消费者
创建一个名为 hello-dubbo-nacos-consumer
的服务消费者项目
引入依赖
同样在 pom.xml
中添加以下主要依赖
<!-- Nacos And Dubbo -->
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-serialization-kryo</artifactId>
</dependency>
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-spring-boot-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo-registry-nacos</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba.nacos</groupId>
<artifactId>nacos-client</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba.spring</groupId>
<artifactId>spring-context-support</artifactId>
</dependency>
<!-- 依赖服务提供者接口模块,用于调用接口 -->
<dependency>
<groupId>com.antoniopeng</groupId>
<artifactId>hello-dubbo-nacos-provider-api</artifactId>
<version>${project.parent.version}</version>
</dependency>
相关配置
在 application.yml
中添加以下配置
spring:
application:
name: dubbo-nacos-consumer
main:
allow-bean-definition-overriding: true
dubbo:
scan:
# 配置 Controller 扫描路径
base-packages: com.antoniopeng.dubbo.nacos.consumer.controller
protocol:
name: dubbo
port: -1
registry:
address: nacos://192.168.127.132:8848
server:
port: 8080
# 服务监控检查
endpoints:
dubbo:
enabled: true
management:
health:
dubbo:
status:
defaults: memory
extras: threadpool
endpoints:
web:
exposure:
include: "*"
Controller
通过 org.apache.dubbo.config.annotation
包下的 @Reference
注解以 RPC
通信的方式调用服务,而对外提供以 HTTP
通信的方式的 Restful API
import com.antoniopeng.dubbo.nacos.provider.api.EchoService;
import org.apache.dubbo.config.annotation.Reference;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class EchoController {
@Reference(version = "1.0.0")
private EchoService echoService;
@GetMapping(value = "/echo/{string}")
public String echo(@PathVariable String string) {
return echoService.echo(string);
}
}
验证是否成功
通过浏览器访问 Nacos Server 网址 http:192.168.127.132:8848/nacos ,会发现又多了一个服务在服务列表中。
然后再访问服务消费者对外提供的 RESTful API http://localhost:8080/echo/hi,浏览器会响应以下内容:
Echo Hello Dubbo hi
到此,实现了 Nacos 与 Dubbo 的融合。
- 文章作者:彭超
- 本文首发于个人博客:https://antoniopeng.com/2020/02/13/springcloudalibaba/SpringCloudAlibaba%E4%B8%8EDubbo%E7%9A%84%E5%AE%8C%E7%BE%8E%E8%9E%8D%E5%90%88/
- 版权声明:本博客所有文章除特别声明外,均采用 CC BY-NC-SA 4.0 许可协议。转载请注明来自 彭超 | Blog!