SpringBoot整合Dubbo和Zookeeper

以下純屬個人理解，比較俗氣不專業大佬勿噴

一、分佈式

1、什麼是分佈式

分佈式就是一個項目有多個功能模塊，把這些功能模塊拆分成若干個子項目，並分別部署在多臺服務器上的方式叫做分佈式

2、分佈式和集羣的區別

集羣是同一個功能模塊部署在多臺服務器上，主要是爲了實現負載均衡，緩解服務器壓力

分佈式就是多個不同的功能模塊分別部署在多臺服務器上，主要是爲了代碼解偶和緩解服務器壓力

二、Springboot整合Dubbo和Zookeeper

1、關係圖，以銀行系統爲例

如果你覺得服務註冊中心太難懂的話，你也可以把它當成類似esb的中樞，或者調用對應方法的代理

2、整合過程

（1）項目結構如下

（2）中間商

common是一個普通的maven工程，是服務提供方開發的並且會打成一個jar包，服務提供方自己會引入這個jar包進行接口實現，而服務調用方會引入這個jar包進行服務調用

RPCService：

package com.lcy.common.service;

/**
 * 功能描述：
 *
 * @author liuchaoyong
 * @version 1.0
 * @date 2019-08-19 15:33
 */
public interface RPCService {

    void test();

}

POM：

注意<packaging>裏原來是war，改成jar

<?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.lcy</groupId>
    <artifactId>common</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>common Maven Webapp</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <build>
        <finalName>common</finalName>
        <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
            <plugins>
                <plugin>
                    <artifactId>maven-clean-plugin</artifactId>
                    <version>3.1.0</version>
                </plugin>
                <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
                <plugin>
                    <artifactId>maven-resources-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.8.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-surefire-plugin</artifactId>
                    <version>2.22.1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-war-plugin</artifactId>
                    <version>3.2.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-install-plugin</artifactId>
                    <version>2.5.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-deploy-plugin</artifactId>
                    <version>2.8.2</version>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>
</project>

（3）賣家

provider作爲服務的提供方，是一個簡單的springboot服務，引入自己提供的common-jar包並實現它

POM：

zookeeper的版本有個小坑，需要根據你服務器上的zk版本下載對應版本的依賴

<?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>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.lcy</groupId>
    <artifactId>provider</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>provider</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>
        <!--dubbo-->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>2.7.3</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.curator/curator-recipes -->
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-recipes</artifactId>
            <version>4.2.0</version>
            <exclusions>
                <exclusion>
                    <groupId>org.apache.zookeeper</groupId>
                    <artifactId>zookeeper</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.13</version>
        </dependency>


        <dependency>
            <groupId>com.lcy</groupId>
            <artifactId>common</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>

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

</project>

application.properties:

server.port=8081

# dubbo配置名稱
dubbo.application.name=provider
# 服務註冊地址
dubbo.registry.address=zookeeper://127.0.0.1:2181
# 服務對外名
dubbo.protocol.name=dubbo
# 服務對外暴露端口
dubbo.protocol.port=20880

RPCServiceImpl：

實現jar包中的接口

注意註解@Service不是spring的，是dubbo的，用於暴露服務

package com.lcy.provider.impl;

import com.lcy.common.service.RPCService;
import org.apache.dubbo.config.annotation.Service;

/**
 * 功能描述：
 *
 * @author liuchaoyong
 * @version 1.0
 * @date 2019-08-19 15:40
 */
@Service
public class RPCServiceImpl implements RPCService {

    @Override
    public void test() {
        System.out.println("sayHello");
    }
}

啓動類：

在普通啓動類的基礎上加@EnableDubbo表示使用dubbo

package com.lcy.provider;

import org.apache.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@EnableDubbo
public class ProviderApplication {

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

}

（4）買家

作爲服務調用方，引入服務提供方提供的jar包

POM:

同上注意zk版本

<?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>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.lcy</groupId>
    <artifactId>consumer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>customer</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>
        <!--dubbo-->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>2.7.3</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.curator/curator-recipes -->
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-recipes</artifactId>
            <version>4.2.0</version>
            <exclusions>
                <exclusion>
                    <groupId>org.apache.zookeeper</groupId>
                    <artifactId>zookeeper</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.13</version>
        </dependency>
        <dependency>
            <groupId>com.lcy</groupId>
            <artifactId>common</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>

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

</project>

application.properties:

server.port=8080

# dubbo-consumer.properties
dubbo.application.name=consumer
dubbo.registry.address=zookeeper://127.0.0.1:2181
dubbo.consumer.timeout=3000

Controller：

很普通的，供前端調用的接口

其中引入服務使用@Reference，而不使用我們常用的@AutoWired，意義不同

 package com.lcy.consumer.controller;

import com.lcy.common.service.RPCService;
import org.apache.dubbo.config.annotation.Reference;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 功能描述：
 *
 * @author liuchaoyong
 * @version 1.0
 * @date 2019-08-19 16:09
 */
@RestController
public class RPCController {

    @Reference
    private RPCService rpcService;

    @GetMapping("test")
    public void test(){
        rpcService.test();
    }

}

啓動類：

package com.lcy.consumer;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ConsumerApplication {

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

}

然後啓動zk->啓動provider->啓動consumer->測試一下接口，provider有打印輸出，大功告成

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