整合dubbo+Nacos实战（二）

目录

• 前言
• 新建父工程cloud-alibaba-demo
• 新建子工程dubbo-demo-service
• 新建子工程gtw
• 启动工程
• 测试

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）

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

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-demo

配置文件pom.xml

管理子工程jar版本

代码语言：javascript复制

<modules>
        <module>gtw</module>
        <module>demo-service</module>
        <module>dubbo-demo-service</module>
    </modules>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR1</spring-cloud.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>0.9.0.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <version>2.2.1.RELEASE</version>
                <scope>test</scope>
            </dependency>
            <!--  nacos注册中心-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
                <version>0.2.1.RELEASE</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

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。

然后引入相关jar包

配置pom.xml

代码语言：javascript复制

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.cuizb</groupId>
        <artifactId>cloud-alibaba-demo</artifactId>
        <version>1.0</version>
    </parent>
    <artifactId>dubbo-demo-service</artifactId>
    <version>1.0</version>
    <name>dubbo-demo-service</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <!-- Dubbo依赖 -->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>2.7.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.7.0</version>
        </dependency>
        <!-- Nacos依赖 -->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-registry-nacos</artifactId>
            <version>2.7.1</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.nacos</groupId>
            <artifactId>nacos-client</artifactId>
            <version>1.0.0</version>
        </dependency>

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

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

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

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]

我创建了一个api接口和一个api接口实现类

DubboDemoService

代码语言：javascript复制

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

DubboDemoServiceImpl

代码语言：javascript复制

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

代码语言：javascript复制

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

代码语言：javascript复制

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

代码语言：javascript复制

<!--        <dependency>-->
<!--            <groupId>org.springframework.cloud</groupId>-->
<!--            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>-->
<!--        </dependency>-->

注释掉了，防止jar冲突。以及config中也不需要注入RestTemplate的bean了。

首先引入jar包

pom.xml

代码语言：javascript复制

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.cuizb</groupId>
        <artifactId>cloud-alibaba-demo</artifactId>
        <version>1.0</version>
    </parent>
    <groupId>com.cuizb.cloud.alibaba</groupId>
    <artifactId>gtw</artifactId>
    <version>1.0</version>
    <name>gtw</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
<!--        <dependency>-->
<!--            <groupId>org.springframework.cloud</groupId>-->
<!--            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>-->
<!--        </dependency>-->

        <!-- Dubbo依赖 -->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>2.7.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.7.0</version>
        </dependency>
        <!-- Nacos依赖 -->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-registry-nacos</artifactId>
            <version>2.7.1</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.nacos</groupId>
            <artifactId>nacos-client</artifactId>
            <version>1.0.0</version>
        </dependency>
        <dependency>
            <groupId>com.cuizb</groupId>
            <artifactId>dubbo-demo-service</artifactId>
            <version>1.0</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

网关入口类

GtwServiceImpl

代码语言：javascript复制

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

代码语言：javascript复制

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

代码语言：javascript复制

@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nacos

测试

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

如果先启动消费者会出现启动报错

代码语言：javascript复制

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]

对象存储 dubbo api jar maven

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