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前言

nacos的實戰(zhàn)在前面一章已經(jīng)介紹到?Spring Cloud Alibaba+Nacos的介紹與實戰(zhàn)（一）[1]?以及幾種注冊中心的區(qū)別介紹?幾種常見的注冊中心以及區(qū)別[2]

新建父工程cloud-alibaba-demo

源碼已經(jīng)上傳到gitee上地址：https://gitee.com/culzb/cloud-alibaba-demo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

當前子工程相是被調(diào)用的服務，也就是說服務提供者。在dubbo中作為provider。然后引入相關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>

然后創(chuàng)建api接口，配置dubbo掃描的包路徑，會將指定掃描的包路徑中的所有接口注冊到nacos中。

?注意?創(chuàng)建的api接口實現(xiàn)類上一定要加上@service，引入包路徑為：import org.apache.dubbo.config.annotation.Service;
否則在啟動時控制臺會出現(xiàn)[DUBBO] No Spring Bean annotating Dubbo's @Service was found under package[com.cuizb.dubbo.demoservice.api]

我創(chuàng)建了一個api接口和一個api接口實現(xiàn)類 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相關信息 application.properties

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


# 配置服務信息
dubbo.application.name=dubbo-demo-service
## 禁用QOS同一臺機器可能會有端口沖突現(xiàn)象
#dubbo.qos-enable=false
#dubbo.qos-accept-foreign-ip=False
# 配置注冊中心

#spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
dubbo.registry.address=nacos://127.0.0.1:8848
# 設置協(xié)議-協(xié)議由提供方指定消費方被動接受
dubbo.protocol.name=dubbo
dubbo.protocol.port=7702
dubbo.scan.base-packages=com.cuizb.dubbo.demoservice.api
# 解決Bean重復定義問題
spring.main.allow-bean-definition-overriding=true

啟動類加上@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 //開啟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

我沒有按照dubbo那樣分為provider和consumer區(qū)分工程，我按照項目習慣將網(wǎng)關作為服務消費者，其他服務作為服務提供者。由于我沿用了上一章節(jié)的網(wǎng)關工程，所以我會將pom.xml中的

注釋掉了，防止jar沖突。以及config中也不需要注入RestTemplate的bean了。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>

網(wǎng)關入口類 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遠程調(diào)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


# 配置服務信息
dubbo.application.name=dubbo-gtw
# 禁用QOS同一臺機器可能會有端口沖突現(xiàn)象
dubbo.qos-enable=false
dubbo.qos-accept-foreign-ip=false
# 配置注冊中心
dubbo.registry.address=nacos://127.0.0.1:8848
# 設置協(xié)議-協(xié)議由提供方指定消費方被動接受
dubbo.protocol.name=dubbo
dubbo.protocol.port=7705
dubbo.consumer.timeout=3000
# 解決Bean重復定義問題
spring.main.allow-bean-definition-overriding=true

啟動類加上@EnableDubbo

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

}

啟動工程

首先啟動服務提供者dubbo-demo-service，然后啟動服務消費者gtw 查看nacos

測試

輸入地址：http://localhost:8705/hello?name=cuizb1

如果先啟動消費者會出現(xiàn)啟動報錯

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的介紹與實戰(zhàn)（一）:?https://cuizb.top/myblog/article/1647705645
[2]?幾種常見的注冊中心以及區(qū)別:?https://cuizb.top/myblog/article/1646575927

本文作者：Java技術(shù)債務
原文鏈接：https://www.cuizb.top/myblog/article/1647833843
版權(quán)聲明：本博客所有文章除特別聲明外，均采用 CC BY 3.0 CN協(xié)議進行許可。轉(zhuǎn)載請署名作者且注明文章出處。
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整合dubbo+Nacos實戰(zhàn)(二)

前言

新建父工程cloud-alibaba-demo

新建子工程dubbo-demo-service

新建子工程gtw

啟動工程

測試

References