dubbo服务简单搭建

一、初识dubbo:

架构图

  Provider: 暴露服务的服务提供方。

       Consumer: 调用远程服务的服务消费方。

       Registry: 服务注册与发现的注册中心。

       Monitor: 统计服务的调用次调和调用时间的监控中心。

       Container: 服务运行容器。

流程:

  服务容器负责启动,加载,运行服务提供者。

  服务提供者在启动时,向注册中心注册自己提供的服务。

  服务消费者在启动时,向注册中心订阅自己所需的服务。

  注册中心返回服务提供者地址列表给消费者,如果有变更,注册中心将基于长连接推送变更数据给消费者。 

  服务消费者,从提供者地址列表中,基于软负载均衡算法,选一台提供者进行调用,如果调用失败,再选另一台调用。

  服务消费者和提供者,在内存中累计调用次数和调用时间,定时每分钟发送一次统计数据到监控中心。

注册中心选择

 dubbo支持多种类型的注册中心:

  •   Multicast注册中心
  •   Zookeeper注册中心
  •   Redis注册中心
  •   Simple注册中心

二、ZooKeeper

下载:https://archive.apache.org/dist/zookeeper/

windows安装:https://blog.csdn.net/tlk20071/article/details/52028945

三、服务Demo搭建

1、新建一个maven工程:结构如下

其中模块dubbo-api用于给提供服务模块dubbo-provider和消费服务dubbo-cosumer提供公用接口,各目录结构为:

模块dubbo-api简单测试代码如下:

package com.example.demo;

public interface DemoService {
    String testService();
}

提供服务模块dubbo-provider:

  pom文件:

<?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>

    <groupId>com.example</groupId>
    <artifactId>dubbo-provider</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>dubbo-provider</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    <!-- dubbo-api依赖 -->
        <dependency>
            <groupId>com.example</groupId>
            <artifactId>dubbo-api</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    <!-- dubbo依赖 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.4.10</version>
            <exclusions>
                <exclusion>
                    <artifactId>spring</artifactId>
                    <groupId>org.springframework</groupId>
                </exclusion>
            </exclusions>
        </dependency>
    <!-- zkclient -->
        <dependency>
            <groupId>com.101tec</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.3</version>
        </dependency>
    </dependencies>

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


</project>

  实现接口类:

package com.example.demo.impl;

import com.example.demo.DemoService;

public class DemoServiceimpl implements DemoService {
    @Override
    public String testService() {
        return "provider testService";
    }
}

  启动类:

package com.example.demo.provider;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;

public class Provider {
    public static void main(String[] args) {
     //测试 ClassPathXmlApplicationContext context
= new ClassPathXmlApplicationContext( "classpath*:provider.xml"); context.start(); System.out.println("dubbo service begin to start"); try { System.in.read(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }

  配置文件:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://code.alibabatech.com/schema/dubbo
       http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
    <!--定义了提供方应用信息,用于计算依赖关系;在 dubbo-admin 或 dubbo-monitor 会显示这个名字,方便辨识-->
    <dubbo:application name="demo-provider" owner="programmer" organization="dubbox"/>
    <!--使用 zookeeper 注册中心暴露服务,注意要先开启 zookeeper-->
    <dubbo:registry address="zookeeper://localhost:2181"/>
    <!-- 用dubbo协议在20880端口暴露服务 -->
    <dubbo:protocol name="dubbo" port="20880" />
    <!--使用 dubbo 协议实现定义好的 api.PermissionService 接口-->
    <dubbo:service interface="com.example.demo.DemoService" ref="demoService" protocol="dubbo" />
    <!--具体实现该接口的 bean-->
    <bean id="demoService" class="com.example.demo.impl.DemoServiceimpl"/>
</beans>

消费服务dubbo-cosumer:

  pom文件:

<?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>

    <groupId>com.example</groupId>
    <artifactId>duboo-consumer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>duboo-consumer</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- dubbo-api -->
        <dependency>
            <groupId>com.example</groupId>
            <artifactId>dubbo-api</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
        <!-- dubbo依赖 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.4.10</version>
            <exclusions>
                <exclusion>
                    <artifactId>spring</artifactId>
                    <groupId>org.springframework</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- zkclient依赖 -->
        <dependency>
            <groupId>com.101tec</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.3</version>
        </dependency>
    </dependencies>

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


</project>

  启动类: 

package com.example.demo.consumer;

import com.example.demo.DemoService;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Consumer {
    public static void main(String[] args) {
        //测试服务
        ClassPathXmlApplicationContext context =
                new ClassPathXmlApplicationContext("consumer.xml");
        context.start();
        System.out.println("consumer start");
        DemoService demoService = context.getBean(DemoService.class);
        System.out.println("consumer");
        System.out.println(demoService.testService());
    }
}

  配置文件:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
    <dubbo:application name="demo-consumer" owner="programmer" organization="dubbox"/>
    <!--向 zookeeper 订阅 provider 的地址,由 zookeeper 定时推送-->
    <dubbo:registry address="zookeeper://localhost:2181"/>
    <!--使用 dubbo 协议调用定义好的 api.PermissionService 接口-->
    <dubbo:reference id="demoService" interface="com.example.demo.DemoService"/>
</beans>

四、测试:

zookeeper服务启动后,先启动服务提供方dubbo-provider,再运行dubbo-consuner,效果如下:

 

 

源码参照Github

posted @ 2018-03-29 13:50  花拾夕  阅读(613)  评论(0编辑  收藏  举报