dubbo 快速启动-根据官网demo

官网:http://dubbo.apache.org/zh-cn/docs/user/quick-start.html
官网demo: https://github.com/apache/incubator-dubbo

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新建项目

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父pom文件

<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>
    <groupId>com.ghgcn</groupId>
    <artifactId>dubbo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>
    <modules>
        <module>dubbo-provider</module>
        <module>dubbo-api</module>
        <module>dubbo-consumer</module>
    </modules>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <version.junit>4.12</version.junit>
        <version.jdk>1.8</version.jdk>
        <version.spring>4.3.16.RELEASE</version.spring>
        <version.commons-lang3>3.5</version.commons-lang3>
        <dubbo.version>2.6.5</dubbo.version>
        <version.netty>4.1.31.Final</version.netty>
        <version.curator>2.12.0</version.curator>
        <version.logback>1.2.3</version.logback>
    </properties>

    <dependencies>
            <dependency>
                <groupId>com.sun</groupId>
                <artifactId>tools</artifactId>
                <version>${version.jdk}</version>
                <scope>system</scope>
                <systemPath>${JAVA_HOME}/lib/tools.jar</systemPath>
            </dependency>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>${version.junit}</version>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-test</artifactId>
                <version>${version.spring}</version>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-lang3</artifactId>
                <version>${version.commons-lang3}</version>
            </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.2</version>
                <configuration>
                    <source>${version.jdk}</source>
                    <target>${version.jdk}</target>
                    <encoding>${project.build.sourceEncoding}</encoding>
                </configuration>
            </plugin>
        </plugins>
    </build>
    
</project>

provider pom

<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.ghgcn</groupId>
        <artifactId>dubbo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <artifactId>dubbo-provider</artifactId>
    <dependencies>
        <dependency>
            <groupId>com.ghgcn</groupId>
            <artifactId>dubbo-api</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>${dubbo.version}</version>
            <exclusions>
                <exclusion>
                    <groupId>org.jboss.netty</groupId>
                    <artifactId>netty</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-all</artifactId>
            <version>${version.netty}</version>
        </dependency>
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty</artifactId>
            <version>3.10.5.Final</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>${version.curator}</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>${version.logback}</version>
        </dependency>
    </dependencies>
</project>

consumer pom

<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.ghgcn</groupId>
        <artifactId>dubbo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <artifactId>dubbo-consumer</artifactId>
    <dependencies>
        <dependency>
            <groupId>com.ghgcn</groupId>
            <artifactId>dubbo-api</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>${dubbo.version}</version>
        </dependency>

        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-all</artifactId>
            <version>${version.netty}</version>
        </dependency>
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty</artifactId>
            <version>3.10.5.Final</version>
        </dependency>
<dependency>
    <groupId>org.apache.curator</groupId>
    <artifactId>curator-framework</artifactId>
    <version>${version.curator}</version>
</dependency>
    <dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-classic</artifactId>
    <version>${version.logback}</version>
</dependency>
    </dependencies>
</project>

api就一个接口

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package com.ghg.dubbo.api;

public interface GreetingService {

    String sayHello(String name);
}

provider

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实现类

package com.ghgcn.dubbo.service.impl;

import com.ghg.dubbo.api.GreetingService;

public class GreetingServiceImpl implements GreetingService {

    @Override
    public String sayHello(String name) {
        return "Hello " + name;
    }

}

service-provider.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:dubbo="http://dubbo.apache.org/schema/dubbo" xmlns="http://www.springframework.org/schema/beans"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
       http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd">

    <dubbo:application name="demo-provider" />

    <!-- 注册中心地址 -->
<!--    <dubbo:registry address="multicast://224.5.6.7:1234" /> -->
    <dubbo:registry  protocol="zookeeper"  address="zookeeper://127.0.0.1:2181" />

    <!-- 声明协议与商品-->
    <dubbo:protocol name="dubbo" port="20880" />

    <!-- 声明服务的实现类 -->
    <bean id="greetingService" class="com.ghgcn.dubbo.service.impl.GreetingServiceImpl" />

    <!-- 声明服务 -->
    <dubbo:service interface="com.ghg.dubbo.api.GreetingService"
        ref="greetingService" />
</beans>

main方法

package com.ghgcn.dubbo;

import java.io.IOException;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {

   public static void main(String[] args) throws IOException {
       // com.alibaba.dubbo.container.Main.main(args);
       ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
               new String[]{ "META-INF/spring/service-provider.xml" });
       context.start();
       System.out.println("provider启动了");
       System.in.read(); // press any key to exit
   }

}

consumer

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dubbo-client.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:dubbo="http://dubbo.apache.org/schema/dubbo" xmlns="http://www.springframework.org/schema/beans"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
       http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd">

    <dubbo:application name="dubbo-consumer"  />

    <!-- 注册中心 -->
    <dubbo:registry protocol="zookeeper" address="zookeeper://127.0.0.1:2181" />

    <!-- 声明要引用的服务 -->
    <dubbo:reference id="greetingService" check="false" interface="com.ghg.dubbo.api.GreetingService" />
</beans>

main方法

package com.ghgcn.consumer;

import java.util.Date;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.ghg.dubbo.api.GreetingService;

public class Main {

    public static void main(String[] args) {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
                new String[]{ "sping/dubbo-client.xml" });
        context.start();
        GreetingService greetingService = (GreetingService) context.getBean("greetingService"); // get remote service

        while (true) {
            try {
                Thread.sleep(1000);
                System.out.println(greetingService.sayHello("刘楠* " + new Date()));
            } catch (Throwable throwable) {
                throwable.printStackTrace();
            }

        }
    }

}

运行provider与consumer的main方法

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可以通过dubbo-admin来查看

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遇到的问题

dubbo 启动报服务注册失败Failed to register dubbo

Exception in thread "main" java.lang.IllegalStateException: Failed to register dubbo://192.168.187.1:20880/com.ghg.dubbo.api.GreetingService?anyhost=true&application=demo-provider&bean.name=com.ghg.dubbo.api.GreetingService&dubbo=2.0.2&generic=false&interface=com.ghg.dubbo.api.GreetingService&methods=sayHello&pid=9092&side=provider&timestamp=1545384997858 to registry 127.0.0.1:2181, cause: Failed to register dubbo://192.168.187.1:20880/com.ghg.dubbo.api.GreetingService?anyhost=true&application=demo-provider&bean.name=com.ghg.dubbo.api.GreetingService&dubbo=2.0.2&generic=false&interface=com.ghg.dubbo.api.GreetingService&methods=sayHello&pid=9092&side=provider&timestamp=1545384997858 to zookeeper zookeeper://127.0.0.1:2181/com.alibaba.dubbo.registry.RegistryService?application=demo-provider&dubbo=2.0.2&interface=com.alibaba.dubbo.registry.RegistryService&pid=9092&timestamp=1545384997854, cause: KeeperErrorCode = Unimplemented for /dubbo/com.ghg.dubbo.api.GreetingService/providers/dubbo%3A%2F%2F192.168.187.1%3A20880%2Fcom.ghg.dubbo.api.GreetingService%3Fanyhost%3Dtrue%26application%3Ddemo-provider%26bean.name%3Dcom.ghg.dubbo.api.GreetingService%26dubbo%3D2.0.2%26generic%3Dfalse%26interface%3Dcom.ghg.dubbo.api.GreetingService%26methods%3DsayHello%26pid%3D9092%26side%3Dprovider%26timestamp%3D1545384997858
   at com.alibaba.dubbo.registry.support.FailbackRegistry.register(FailbackRegistry.java:150)
   at com.alibaba.dubbo.registry.integration.RegistryProtocol.register(RegistryProtocol.java:126)
   at com.alibaba.dubbo.registry.integration.RegistryProtocol.export(RegistryProtocol.java:146)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper.export(ProtocolFilterWrapper.java:98)
   at com.alibaba.dubbo.qos.protocol.QosProtocolWrapper.export(QosProtocolWrapper.java:60)
   at com.alibaba.dubbo.rpc.protocol.ProtocolListenerWrapper.export(ProtocolListenerWrapper.java:55)
   at com.alibaba.dubbo.rpc.Protocol$Adaptive.export(Protocol$Adaptive.java)
   at com.alibaba.dubbo.config.ServiceConfig.doExportUrlsFor1Protocol(ServiceConfig.java:513)
   at com.alibaba.dubbo.config.ServiceConfig.doExportUrls(ServiceConfig.java:358)
   at com.alibaba.dubbo.config.ServiceConfig.doExport(ServiceConfig.java:317)

解决方法：
这里的问题主要是服务端的zookeeper版本和客户端的zookeeper版本不同。
只要降低一下curator-framework的版本就可以了，

<version.curator>2.12.0</version.curator>

        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>${version.curator}</version>
        </dependency>

终于走出第一走了。

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dubbo 快速启动-根据官网demo

新建项目

父pom文件

provider pom

consumer pom

api就一个接口

provider

consumer

遇到的问题

推荐阅读更多精彩内容