dubbo的简单搭建

1.父工程pom中指定依赖以及版本

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>org.example</groupId><artifactId>demo-base</artifactId><packaging>pom</packaging><version>1.0-SNAPSHOT</version><modules><module>service-api</module><module>service-provider</module><module>service-consumer</module></modules><properties><dubbo.version>2.7.5</dubbo.version></properties><dependencyManagement><dependencies><dependency><groupId>org.apache.dubbo</groupId><artifactId>dubbo</artifactId><version>${dubbo.version}</version></dependency><dependency><groupId>org.apache.dubbo</groupId><artifactId>dubbo-common</artifactId><version>${dubbo.version}</version></dependency><dependency><groupId>org.apache.dubbo</groupId><artifactId>dubbo-registry-zookeeper</artifactId><version>${dubbo.version}</version><exclusions><exclusion><groupId>org.apache.dubbo</groupId><artifactId>dubbo-remoting-api</artifactId></exclusion><exclusion><groupId>org.apache.dubbo</groupId><artifactId>dubbo-common</artifactId></exclusion></exclusions></dependency><dependency><groupId>org.apache.dubbo</groupId><artifactId>dubbo-registry-nacos</artifactId><version>${dubbo.version}</version></dependency><dependency><groupId>org.apache.dubbo</groupId><artifactId>dubbo-rpc-dubbo</artifactId><version>${dubbo.version}</version><exclusions><exclusion><groupId>org.apache.dubbo</groupId><artifactId>dubbo-remoting-api</artifactId></exclusion><exclusion><groupId>org.apache.dubbo</groupId><artifactId>dubbo-common</artifactId></exclusion></exclusions></dependency><dependency><groupId>org.apache.dubbo</groupId><artifactId>dubbo-remoting-netty4</artifactId><version>${dubbo.version}</version><exclusions><exclusion><groupId>org.apache.dubbo</groupId><artifactId>dubbo-remoting-api</artifactId></exclusion></exclusions></dependency><dependency><groupId>org.apache.dubbo</groupId><artifactId>dubbo-serialization-hessian2</artifactId><version>${dubbo.version}</version><exclusions><exclusion><groupId>org.apache.dubbo</groupId><artifactId>dubbo-common</artifactId></exclusion></exclusions></dependency></dependencies></dependencyManagement><dependencies><!-- 日志配置 --><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.16</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>1.7.5</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>1.7.5</version></dependency><!-- json数据化转换 --><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.62</version></dependency></dependencies><build><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>3.3</version><configuration><source>1.8</source><target>1.8</target></configuration></plugin></plugins></build></project>

2. 创建提供者模块

2.1 引入依赖

<?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>demo-base</artifactId><groupId>org.example</groupId><version>1.0-SNAPSHOT</version></parent><modelVersion>4.0.0</modelVersion><artifactId>service-provider</artifactId><dependencies><dependency><groupId>org.example</groupId><artifactId>service-api</artifactId><version>1.0-SNAPSHOT</version></dependency><!--dubbo相关依赖，因为在父模块中已经指定了版本号，所以子模块不用再指定版本号jdk11使用该版本有冲突，启动不起来，必须切换成jdk8--><dependency><groupId>org.apache.dubbo</groupId><artifactId>dubbo</artifactId></dependency><!--这个也可以用--><!--<dependency>--><!--    <groupId>org.apache.dubbo</groupId>--><!--    <artifactId>dubbo-spring-boot-starter</artifactId>--><!--    <version>2.7.5</version>--><!--</dependency>--><dependency><groupId>org.apache.dubbo</groupId><artifactId>dubbo-registry-zookeeper</artifactId></dependency><dependency><groupId>org.apache.dubbo</groupId><artifactId>dubbo-rpc-dubbo</artifactId></dependency><dependency><groupId>org.apache.dubbo</groupId><artifactId>dubbo-remoting-netty4</artifactId></dependency><dependency><groupId>org.apache.dubbo</groupId><artifactId>dubbo-serialization-hessian2</artifactId></dependency></dependencies></project>

2.2 编写dubbo的配置类

#程序名称
dubbo.application.name=service-provider#协议使用dubbo协议
dubbo.protocol.name=dubbo#指定dubbo的通信端口(随意指定)
dubbo.protocol.port=20880

2.3 编写提供者的启动类，先写静态内部类作为dubbo的配置类，配置相关属性以及注册中心地址，然后再main方法中创建上下文对象，启动容器即可。

package com.lwb;import org.apache.dubbo.config.RegistryConfig;
import org.apache.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;import java.io.IOException;public class DubboMain {public static void main(String[] args) throws IOException {// 创建一个上下文对象AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ProviderConfiguration.class);context.start();// 让容器启动System.in.read(); // 让程序停在这}// 写一个服务提供者的配置类@Configuration@EnableDubbo(scanBasePackages = "com.lwb.service.impl") // 类似组件扫描，也需要指定一个包，这里扫描的是实现类的包@PropertySource("classpath:/dubbo-provider.properties") // 加载配置文件static class ProviderConfiguration{// 加载注册中心的配置方法@Beanpublic RegistryConfig registryConfig(){// 创建一个注册中心的对象RegistryConfig registryConfig = new RegistryConfig();// 赋值注册中心地址  需要启动zookeeperregistryConfig.setAddress("zookeeper://127.0.0.1:2181");return registryConfig;}}
}

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3.公共API模块只需要编写一个接口，用来调用即可。

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4.消费者模块

4.1引入依赖，和提供者的依赖一样

4.2编写组件类

package com.lwb.bean;import com.lwb.service.HelloService;
import org.apache.dubbo.config.annotation.Reference;
import org.springframework.stereotype.Component;@Component
public class ConsumerComponent {// 引入dubbo的service对象@Referenceprivate HelloService helloService;public String sayHello(String name){return helloService.sayHello(name);}}

4.3编写配置文件

dubbo.application.name=service-consumer#zookeeper地址
dubbo.registry.address=zookeeper://127.0.0.1:2181

4.4编写启动测试类

package com.lwb;import com.lwb.bean.ConsumerComponent;
import org.apache.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;import java.io.IOException;public class ConsumerMain {public static void main(String[] args) throws IOException {// 因为这是基于注解+配置类的方式进行dubbo参数的配置AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ConsumerConfiguration.class);context.start();// 获取消费者组件ConsumerComponent service = context.getBean(ConsumerComponent.class);while (true){System.in.read();String world = service.sayHello("world");System.out.println("result===="+world);}}@Configuration@PropertySource("classpath:/dubbo-consumer.properties")@ComponentScan(basePackages = "com.lwb.bean") // spring的组件扫描@EnableDubbo //因为要引入dubbo组件，所以需要该注解static class ConsumerConfiguration{}}

运行效果：

说明：在控制台按几次键，就会打印几次结果。

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