系統架構演變

1. 單一應用框架（ORM）所有功能部署在一個應用上

2. 垂直應用框架（MVC） 將功能分到多個應用上，缺乏複用性

3. 分散式應用架構（RPC）功能作為服務抽離出來，形成服務中心

4. 流動計算架構（SOA）面向服務的體系結構

Dubbo簡介

Dubbo：

一款基於RPC的分散式服務框架，架構包含

1. Provider：服務提供方

2. Consumer：服務使用方

3. Registry：服務註冊中心

dubbo提供的：Multicast、ZooKeeper、Redis、Simple註冊中心

4. Monitor：服務監控中心

Dubbo優點

1. 呼叫遠端方法如同呼叫本地方法

2. 負載均衡及容錯機制

3.服務註冊中心自動註冊

4.服務介面監控與治理

Dubbo使用Demo

服務端：

1. pom.xml

<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.rambo</groupId>
  <artifactId>dubbotest</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <!--引入springboot-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--引入dubbot-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.5.7</version>
        </dependency>
        <!--引入zookeeper-->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.6</version>
        </dependency>
        <!--引入zookeeper客戶端-->
        <dependency>
            <groupId>com.github.sgroschupf</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.1</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>
 

2. DubboServiceProvider

package com.rambo.dubbotest.service;

public interface DubboServiceProvider {
	//宣告服務方法
    public String sayHello(String name);
}

 3. DubboServiceProvider實現

package com.rambo.dubbotest.service.impl;

import com.rambo.dubbotest.service.DubboServiceProvider;

@Component("dubboServiceProvider")
public class DubboServiceProviderImpl implements DubboServiceProvider {

	public String sayHello(String name) {
		// TODO Auto-generated method stub
		return "Hello, " + name;
	}

}
 

 4. 啟動類

package com.rambo.dubbotest;


import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ImportResource;

@SpringBootApplication
@ImportResource("classpath:/dubbo.xml")
public class ProviderApplication {

    public static void main(String[] args){
        SpringApplication.run(ProviderApplication.class,args);
    }
}

5. Dubbo.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://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">
    <!--配置服務名稱-->
    <dubbo:application name="dubboproviderhello" />
    <!--配置服務註冊中心，dubbo不僅僅支援zookeeper-->
    <dubbo:registry address="zookeeper://127.0.0.1:2181" />
    <!--宣告對外暴露的服務-->
    <dubbo:service interface="com.rambo.service.DubboServiceProvider" ref="dubboServiceProvider" />
</beans>

 客戶端

1.pom.xml 除開aircraftID不一樣

2.Service 包路徑相同的情況下相同的服務介面

3.使用類

package client;


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ImportResource;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import com.rambo.dubbotest.service.DubboServiceProvider;

@SpringBootApplication
@ImportResource("classpath:/dubbo.xml")
@RestController
public class ConsumerApplication {
    //注入宣告的服務
    @Autowired
    private DubboServiceProvider dubboServiceProvider;

    public  static void main(String[] args){
        SpringApplication.run(ConsumerApplication.class,args);
    }

    //測試服務呼叫
    @ResponseBody
    @RequestMapping("/sayhello/{name}")
    public String hello(@PathVariable String name){
        return dubboServiceProvider.sayHello(name);
    }
}

4.dubbo.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://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">
    <!--配置服務名稱-->
    <dubbo:application name="dubboproviderhello" />
    <!--配置服務註冊中心，dubbo不僅僅支援zookeeper-->
    <dubbo:registry address="zookeeper://127.0.0.1:2181" />
    <!--宣告服務引用，與服務宣告介面型別一致-->
    <dubbo:reference interface="com.rambo.dubbotest.service.DubboServiceProvider" id="dubboServiceProvider" />
</beans>

5. application.properties 修改客戶端啟動的埠

server.port=8081

演示：

1.啟動zookeeper

2.以SpringBoot方式啟動服務端主類

3.以SpringBoot方式啟動客戶端主類

5.http://localhost:8081/sayhello/Rambo

 連結：

DubboServer

DubboClient