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整合dubbo+Nacos实战(二)

Java技术债务

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 · 2022-03-22

前言

nacos的实战在前面一章已经介绍到 Spring Cloud Alibaba+Nacos的介绍与实战（一）[1] 以及几种注册中心的区别介绍 几种常见的注册中心以及区别[2]

新建父工程cloud-alibaba-demo

源码已经上传到gitee上 地址：https://gitee.com/culzb/cloud-alibaba-democa5f33e57bb08651cc2dfa96de27fcf4.webp配置文件pom.xml 管理子工程jar版本


        <module>gtwmodule>
        <module>demo-servicemodule>
        <module>dubbo-demo-servicemodule>



<java.version>1.8java.version>
<spring-cloud.version>Greenwich.SR1spring-cloud.version>





<groupId>org.springframework.cloudgroupId>
<artifactId>spring-cloud-dependenciesartifactId>
<version>${spring-cloud.version}version>
                <type>pomtype>
<scope>importscope>


<groupId>org.springframework.cloudgroupId>
<artifactId>spring-cloud-alibaba-dependenciesartifactId>
<version>0.9.0.RELEASEversion>
                <type>pomtype>
<scope>importscope>


<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<version>2.2.1.RELEASEversion>
<scope>testscope>



<groupId>org.springframework.cloudgroupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discoveryartifactId>
<version>0.2.1.RELEASEversion>



新建子工程dubbo-demo-service

当前子工程相是被调用的服务，也就是说服务提供者。在dubbo中作为provider。a12baee0b8a0f6e836aefad0738e0111.webp然后引入相关jar包 配置pom.xml


"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>4.0.0modelVersion>

<groupId>com.cuizbgroupId>
<artifactId>cloud-alibaba-demoartifactId>
<version>1.0version>

<artifactId>dubbo-demo-serviceartifactId>
<version>1.0version>
<name>dubbo-demo-servicename>
<description>Demo project for Spring Bootdescription>

<java.version>1.8java.version>




<groupId>org.apache.dubbogroupId>
<artifactId>dubbo-spring-boot-starterartifactId>
<version>2.7.0version>


<groupId>org.apache.dubbogroupId>
<artifactId>dubboartifactId>
<version>2.7.0version>



<groupId>org.apache.dubbogroupId>
<artifactId>dubbo-registry-nacosartifactId>
<version>2.7.1version>


<groupId>com.alibaba.nacosgroupId>
<artifactId>nacos-clientartifactId>
<version>1.0.0version>



<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>



<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>






<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>






然后创建api接口，配置dubbo扫描的包路径，会将指定扫描的包路径中的所有接口注册到nacos中。

•注意 创建的api接口实现类上一定要加上@service，引入包路径为：import org.apache.dubbo.config.annotation.Service;

否则在启动时控制台会出现[DUBBO] No Spring Bean annotating Dubbo's @Service was found under package[com.cuizb.dubbo.demoservice.api]

0837b68f9faedf8dd7e9e08a3f49f07e.webp


我创建了一个api接口和一个api接口实现类 DubboDemoService

package com.cuizb.dubbo.demoservice.api;
/**
 * @Author cuizb
 * @Date 2022-03-19 18:09:31
 * @Desc *
 */
public interface DubboDemoService {
String hello(String name);
}

DubboDemoServiceImpl

package com.cuizb.dubbo.demoservice.controller;

import com.cuizb.dubbo.demoservice.api.DubboDemoService;
import org.apache.dubbo.config.annotation.Service;

/**
 * @Author cuizb
 * @Date 2022-03-20 22:07:15
 * @Desc *
 */
@Service
public class DubboDemoServiceImpl implements DubboDemoService {
    @Override
public String hello(String name) {
return "hello " + name + "i am dubbo demoService!";
    }
}

最后配置dubbo以及nacos相关信息 application.properties

server.port=8702
spring.application.name=dubbo-demo-service


# 配置服务信息
dubbo.application.name=dubbo-demo-service
## 禁用QOS同一台机器可能会有端口冲突现象
#dubbo.qos-enable=false
#dubbo.qos-accept-foreign-ip=False
# 配置注册中心

#spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
dubbo.registry.address=nacos://127.0.0.1:8848
# 设置协议-协议由提供方指定消费方被动接受
dubbo.protocol.name=dubbo
dubbo.protocol.port=7702
dubbo.scan.base-packages=com.cuizb.dubbo.demoservice.api
# 解决Bean重复定义问题
spring.main.allow-bean-definition-overriding=true

启动类加上@EnableDubbo

package com.cuizb.dubbo.demoservice;

import org.apache.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;


@EnableDubbo //开启Dubbo的注解支持
//@EnableDiscoveryClient
@SpringBootApplication
public class DubboDemoServiceApplication {
public static void main(String[] args) {
SpringApplication.run(DubboDemoServiceApplication.class, args);
    }
}

新建子工程gtw

我没有按照dubbo那样分为provider和consumer区分工程，我按照项目习惯将网关作为服务消费者，其他服务作为服务提供者。由于我沿用了上一章节的网关工程，所以我会将pom.xml中的





注释掉了，防止jar冲突。以及config中也不需要注入RestTemplate的bean了。b14c24b91dc5ebfac2380f6aacc7f83d.webp首先引入jar包 pom.xml


"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>4.0.0modelVersion>

<groupId>com.cuizbgroupId>
<artifactId>cloud-alibaba-demoartifactId>
<version>1.0version>

<groupId>com.cuizb.cloud.alibabagroupId>
<artifactId>gtwartifactId>
<version>1.0version>
<name>gtwname>
<description>Demo project for Spring Bootdescription>

<java.version>1.8java.version>



<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>



<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>








<groupId>org.apache.dubbogroupId>
<artifactId>dubbo-spring-boot-starterartifactId>
<version>2.7.0version>


<groupId>org.apache.dubbogroupId>
<artifactId>dubboartifactId>
<version>2.7.0version>



<groupId>org.apache.dubbogroupId>
<artifactId>dubbo-registry-nacosartifactId>
<version>2.7.1version>


<groupId>com.alibaba.nacosgroupId>
<artifactId>nacos-clientartifactId>
<version>1.0.0version>


<groupId>com.cuizbgroupId>
<artifactId>dubbo-demo-serviceartifactId>
<version>1.0version>
<scope>compilescope>






<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>






网关入口类 GtwServiceImpl

package com.cuizb.cloud.alibaba.gtw.controller;

import com.cuizb.dubbo.demoservice.api.DubboDemoService;
import org.apache.dubbo.config.annotation.Reference;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

/**
 * @Author cuizb
 * @Date 2022-03-19 18:12:16
 * @Desc *
 */
@RestController
public class GtwServiceImpl {

//    @Autowired
//    private RestTemplate restTemplate;
//
//    @GetMapping("/hello")
//    public String hello(@RequestParam("name") String name) {
//        System.out.println(name);
//        return restTemplate.getForObject("http://demo-service/hello?name=" + name , String.class);
//
//    }

// Dubbo远程调用注解
    @Reference
private DubboDemoService dubboDemoService;

    @GetMapping("/hello")
public String hello(@RequestParam String name) {
return dubboDemoService.hello(name);
    }

}

注意： 注入注解是dubbo中@Reference

dubbo和nacos配置信息

server.port=8705
spring.application.name=dubbo-gtw


# 配置服务信息
dubbo.application.name=dubbo-gtw
# 禁用QOS同一台机器可能会有端口冲突现象
dubbo.qos-enable=false
dubbo.qos-accept-foreign-ip=false
# 配置注册中心
dubbo.registry.address=nacos://127.0.0.1:8848
# 设置协议-协议由提供方指定消费方被动接受
dubbo.protocol.name=dubbo
dubbo.protocol.port=7705
dubbo.consumer.timeout=3000
# 解决Bean重复定义问题
spring.main.allow-bean-definition-overriding=true

启动类加上@EnableDubbo

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

}

启动工程

首先启动服务提供者dubbo-demo-service，然后启动服务消费者gtw 查看nacosda22cc17a397ca127299bb6b0ca2a103.webp

测试

输入地址：http://localhost:8705/hello?name=cuizb16fe0e91f6c9003eaf8127cf9268b9ece.webp

如果先启动消费者会出现启动报错

Caused by: java.lang.IllegalStateException: Failed to check the status of the service com.cuizb.dubbo.demoservice.api.DubboDemoService. No provider available for the service com.cuizb.dubbo.demoservice.api.DubboDemoService from the url nacos://127.0.0.1:8848/org.apache.dubbo.registry.RegistryService?application=dubbo-gtw&default.generic=false&default.timeout=3000&dubbo=2.0.2&generic=false&interface=com.cuizb.dubbo.demoservice.api.DubboDemoService&methods=hello&pid=53247&qos.enable=false&register.ip=192.168.1.5&release=2.7.0&side=consumer&timestamp=1647833584728 to the consumer 192.168.1.5 use dubbo version 2.7.0
at org.apache.dubbo.config.ReferenceConfig.createProxy(ReferenceConfig.java:393) ~[dubbo-2.7.0.jar:2.7.0]
at org.apache.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:301) ~[dubbo-2.7.0.jar:2.7.0]
at org.apache.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:225) ~[dubbo-2.7.0.jar:2.7.0]
at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor$ReferenceBeanInvocationHandler.init(ReferenceAnnotationBeanPostProcessor.java:162) ~[dubbo-2.7.0.jar:2.7.0]
at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor$ReferenceBeanInvocationHandler.access$100(ReferenceAnnotationBeanPostProcessor.java:146) ~[dubbo-2.7.0.jar:2.7.0]
at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.buildInvocationHandler(ReferenceAnnotationBeanPostProcessor.java:140) ~[dubbo-2.7.0.jar:2.7.0]
at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.buildProxy(ReferenceAnnotationBeanPostProcessor.java:122) ~[dubbo-2.7.0.jar:2.7.0]
at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.doGetInjectedBean(ReferenceAnnotationBeanPostProcessor.java:116) ~[dubbo-2.7.0.jar:2.7.0]
at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.doGetInjectedBean(ReferenceAnnotationBeanPostProcessor.java:49) ~[dubbo-2.7.0.jar:2.7.0]
at org.apache.dubbo.config.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor.getInjectedObject(AnnotationInjectedBeanPostProcessor.java:340) ~[dubbo-2.7.0.jar:2.7.0]
at org.apache.dubbo.config.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor$AnnotatedFieldElement.inject(AnnotationInjectedBeanPostProcessor.java:520) ~[dubbo-2.7.0.jar:2.7.0]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:116) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.apache.dubbo.config.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor.postProcessPropertyValues(AnnotationInjectedBeanPostProcessor.java:128) ~[dubbo-2.7.0.jar:2.7.0]

References

[1] Spring Cloud Alibaba+Nacos的介绍与实战（一）: https://cuizb.top/myblog/article/1647705645
[2] 几种常见的注册中心以及区别: https://cuizb.top/myblog/article/1646575927


本文作者：Java技术债务

原文链接：https://www.cuizb.top/myblog/article/1647833843

版权声明： 本博客所有文章除特别声明外，均采用 CC BY 3.0 CN协议进行许可。转载请署名作者且注明文章出处。

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