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『高级篇』docker之课程管理dubbo入门操练(14)

『高级篇』docker之课程管理dubbo入门操练(14)

作者: IT人故事会 | 来源:发表于2018-10-18 10:44 被阅读10次

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    原文链接地址:『高级篇』docker之课程管理dubbo入门操练(14)

    接下来我们即将开始说课程管理,课程服务他是基于dubbo实现的,所以先来预热下,dubbo,对不熟悉的dubbo的老铁进行一下讲解。 源码:https://github.com/limingios/dubbo.git

    dubbo 介绍

    高性能的基于java的,RPC框架。dubbo是阿里巴巴开源的一个项目,就像大多的RPC框架,dubbo的思想围绕一个服务,指定一个方法的参数和返回值,这个方法可以被远程调用的,在服务端,会实现这个接口,会运行dubbo的服务用来处理客户端的调用,在客户端,会有一个存根它提供和服务端想通的方法。其实这些概念用java的术语:首先要定义一个接口,这个接口在服务端和客户端公用,服务端会完成这个接口的实现,客户端通过接口的描述来调用服务端。

    快速入门讲解 spring 版本,

    • 根据官网来创建
    • 创建三个api,provider,consumer 三个项目
    • 用了本地调用。
      provider.xml
    <?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://dubbo.apache.org/schema/dubbo"
           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">
    
        <!-- 提供方应用信息,用于计算依赖关系 -->
        <dubbo:application name="demo-provider"  />
    
        <!-- 使用multicast广播注册中心暴露服务地址 -->
        <dubbo:registry register="false" />
    
        <!-- 用dubbo协议在20880端口暴露服务 -->
        <dubbo:protocol name="dubbo" port="20880" />
    
        <!-- 声明需要暴露的服务接口 -->
        <dubbo:service interface="com.alibaba.dubbo.demo.DemoService" ref="demoService" />
    
        <!-- 和本地bean一样实现服务 -->
        <bean id="demoService" class="com.alibaba.dubbo.demo.provider.DemoServiceImpl" />
    </beans>
    

    consumer.xml

    <?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">
        <parent>
            <artifactId>dubbo-demo</artifactId>
            <groupId>com.idig8</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>dubbo-demo-consumer</artifactId>
        <dependencies>
            <dependency>
                <groupId>com.idig8</groupId>
                <artifactId>dubbo-demo-api</artifactId>
                <version>1.0-SNAPSHOT</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>dubbo</artifactId>
                <version>2.6.4</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>4.3.0.RELEASE</version>
            </dependency>
        </dependencies>
    
    </project>
    

    快速入门讲解springboot版本

    SpringBoot整合dubbo示例

    一、定义API(API模块)

    1. 定义api

    package com.idig8.springboot.dubbo.demo;
    
    public interface DemoService {
        String sayHello(String name);
    }
    

    2. install到本地

    对外提供的maven坐标如下:

    <dependency>
        <groupId>com.idig8</groupId>
        <artifactId>dubbo-demo-api</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
    

    二、服务提供者(provider模块)

    1. 增加maven依赖

    <!-- springboot parent -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.3.RELEASE</version>
    </parent>
    <!-- springboot dubbo starter -->
    <dependency>
        <groupId>io.dubbo.springboot</groupId>
        <artifactId>spring-boot-starter-dubbo</artifactId>
        <version>1.0.0</version>
    </dependency>
    <!-- api dependence -->
    <dependency>
        <groupId>com.idig8</groupId>
        <artifactId>dubbo-demo-api</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
    

    2. 实现API接口

    package com.idig8.springboot.dubbo.demo.provider;
    
    import com.alibaba.dubbo.config.annotation.Service;
    import com.idig8.springboot.dubbo.demo.DemoService;
    
    @Service
    public class DemoServiceImpl implements DemoService {
    
        public String sayHello(String name) {
            return "Hello, " + name + " (from Spring Boot)";
        }
    
    }
    

    3. springboot配置文件 - application.properties

    spring.dubbo.application.name=demo-provider
    #这里使用广播的注册方式,
    #如果有Can't assign address异常需要加vm参数:
    #-Djava.net.preferIPv4Stack=true
    spring.dubbo.registry.address=multicast://224.5.6.7:1234
    spring.dubbo.protocol.name=dubbo
    spring.dubbo.protocol.port=20880
    spring.dubbo.scan=com.idig8.springboot.dubbo.demo.provider
    

    4. 启动类

    package com.idig8.springboot.dubbo.demo.provider;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    public class MainProvider {
        public static void main(String[] args) {
            SpringApplication.run(MainProvider.class,args);
        }
    }
    

    三、服务消费者(consumer模块)

    1. 增加maven依赖

    <!-- springboot parent -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.3.RELEASE</version>
    </parent>
    <!-- springboot web starter -->
    <dependency>
       <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- springboot dubbo starter -->
    <dependency>
        <groupId>io.dubbo.springboot</groupId>
        <artifactId>spring-boot-starter-dubbo</artifactId>
        <version>1.0.0</version>
    </dependency>
    <!-- api dependency -->
    <dependency>
        <groupId>com.idig8</groupId>
        <artifactId>dubbo-demo-api</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
    

    2. 实现controller

    package com.idig8.springboot.dubbo.demo.consumer;
    
    import com.alibaba.dubbo.config.annotation.Reference;
    import com.idig8.springboot.dubbo.demo.DemoService;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class DemoConsumerController {
    
        @Reference
        private DemoService demoService;
    
        @RequestMapping("/sayHello")
        public String sayHello(@RequestParam String name) {
            return demoService.sayHello(name);
        }
    
    }
    

    3. springboot配置文件 - application.properties

    server.port=8080
    #dubbo config
    spring.dubbo.application.name=demo-consumer
    #这里使用广播的注册方式,
    #如果有Can't assign address异常需要加vm参数:
    #-Djava.net.preferIPv4Stack=true
    spring.dubbo.registry.address=multicast://224.5.6.7:1234
    spring.dubbo.scan=com.idig8.springboot.dubbo.demo.consumer
    

    4. 启动类

    package com.idig8.springboot.dubbo.demo.consumer;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    public class Main {
    
        public static void main(String[] args) {
            SpringApplication.run(Main.class,args);
        }
    
    }
    

    PS:dubbo的入门也就到这里,从spring 和springboot 对dubbo的整合。
    流程基本之前也说,api 建立接口,provider 实现接口, consumer 调用接口。


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