一、Dubbo介绍

1、Dubbo是什么

Dubbo是阿里巴巴开源的基于Java的高性能RPC(一种远程调用)分布式服务框架(SOA),致力于提供高性能和透明化的RPC远程服务调用方案,以及SOA服务治理方案

2、Dubbo架构

在这里插入图片描述
节点角色说明

节点角色说明
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统计服务的调用次数和调用时间的监控中心
Container服务运行容器

调用关系说明

0.服务容器负责启动,加载,运行服务提供者

1.服务提供者在启动时,向注册中心注册自己提供的服务

2.服务消费者在启动时,向注册中心订阅自己所需的服务

3.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

4.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

5.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

二、SpringBoot整合Dubbo+ZooKeeper案例

ZooKeeper地址配置为:IP:Port1,IP:Port2,需要根据实际情况修改

1、使用注解的方式

项目目录结构如下:
在这里插入图片描述

1)、user-api:API通用接口
public interface UserService {
    String sayHello();
}
2)、user-service:服务提供者

pom.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</artifactId>
        <groupId>com.hand</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>user-service</artifactId>

    <properties>
        <spring-boot.version>2.1.1.RELEASE</spring-boot.version>
        <dubbo.version>2.7.3</dubbo.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <!-- Spring Boot -->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <!-- Aapche Dubbo  -->
            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo-dependencies-bom</artifactId>
                <version>${dubbo.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo</artifactId>
                <version>${dubbo.version}</version>
                <exclusions>
                    <exclusion>
                        <groupId>org.springframework</groupId>
                        <artifactId>spring</artifactId>
                    </exclusion>
                    <exclusion>
                        <groupId>javax.servlet</groupId>
                        <artifactId>servlet-api</artifactId>
                    </exclusion>
                    <exclusion>
                        <groupId>log4j</groupId>
                        <artifactId>log4j</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>com.hand</groupId>
            <artifactId>user-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <!-- Dubbo Spring Boot Starter -->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>${dubbo.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo</artifactId>
        </dependency>

        <!-- Zookeeper dependencies -->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-dependencies-zookeeper</artifactId>
            <version>${dubbo.version}</version>
            <type>pom</type>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>
</project>

application.properties:

#dubbo.application.name默认值为spring.application.name
spring.application.name=dubbo-auto-configuration-provider-demo
#要扫描dubbo组件的基本包
dubbo.scan.base-packages=com.hand.service.impl
#dubbo协议配置
dubbo.protocol.name=dubbo
dubbo.protocol.port=8081
#dubbo注册中心地址
dubbo.registry.address=zookeeper://IP:Port1,IP:Port2

主启动类:

package com.hand.service;

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

@EnableAutoConfiguration
public class ServiceApplication {

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

}

接口实现类:

package com.hand.service.impl;

import com.hand.user.service.UserService;
import org.apache.dubbo.config.annotation.Service;

@Service(version = "1.0.0")
public class UserServiceImpl implements UserService {
    public String sayHello() {
        return "hello world";
    }
}
3)、user-web:服务消费者

pom.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</artifactId>
        <groupId>com.hand</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>user-web</artifactId>

    <properties>
        <spring-boot.version>2.1.1.RELEASE</spring-boot.version>
        <dubbo.version>2.7.3</dubbo.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <!-- Spring Boot -->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!-- Aapche Dubbo  -->
            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo-dependencies-bom</artifactId>
                <version>${dubbo.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo</artifactId>
                <version>${dubbo.version}</version>
                <exclusions>
                    <exclusion>
                        <groupId>org.springframework</groupId>
                        <artifactId>spring</artifactId>
                    </exclusion>
                    <exclusion>
                        <groupId>javax.servlet</groupId>
                        <artifactId>servlet-api</artifactId>
                    </exclusion>
                    <exclusion>
                        <groupId>log4j</groupId>
                        <artifactId>log4j</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>com.hand</groupId>
            <artifactId>user-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <!-- Dubbo Spring Boot Starter -->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>${dubbo.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo</artifactId>
            <version>${dubbo.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- Zookeeper dependencies -->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-dependencies-zookeeper</artifactId>
            <version>${dubbo.version}</version>
            <type>pom</type>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>
</project>

application.properties:

#dubbo.application.name默认值为spring.application.name
spring.application.name=dubbo-auto-configure-consumer-demo
#dubbo注册中心地址
dubbo.registry.address=zookeeper://IP:Port1,IP:Port2

主启动类:

package com.hand.user;

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

@SpringBootApplication
public class WebApplication {
    public static void main(String[] args) {
        SpringApplication.run(WebApplication.class);
    }
}

消费者:

package com.hand.user.web;

import com.hand.user.service.UserService;
import org.apache.dubbo.config.annotation.Reference;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserController {
    @Reference(version = "1.0.0")
    private UserService userService;

    @RequestMapping("/sayHello")
    public String sayHello() {
        return userService.sayHello();
    }
}

GitHub地址:https://github.com/hxt970311/dubbo-springboot-annotation-demo

2、使用XML的配置方式

1)、user-service:服务提供者

新增provider.xml,在里面配置服务提供方相应的信息

<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://dubbo.apache.org/schema/dubbo"
       xmlns="http://www.springframework.org/schema/beans"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd">
    <dubbo:application name="dubbo-auto-configuration-provider-demo"/>
    <dubbo:registry address="zookeeper://IP:Port1,IP:Port2"/>
    <dubbo:protocol name="dubbo" port="8081"/>
    <bean id="userService" class="com.hand.service.impl.UserServiceImpl"/>
    <dubbo:service interface="com.hand.user.service.UserService" ref="userService"/>
</beans>

去掉具体服务实现类中@Service注解

package com.hand.service.impl;

import com.hand.user.service.UserService;

public class UserServiceImpl implements UserService {
    public String sayHello() {
        return "hello world";
    }
}

在启动类中新增@ImportResource注解

package com.hand.service;

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

@ImportResource("provider.xml")
@EnableAutoConfiguration
public class ServiceApplication {

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

}
2)、user-web:服务消费者

新增consumer.xml

<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://dubbo.apache.org/schema/dubbo"
       xmlns="http://www.springframework.org/schema/beans"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd">
    <dubbo:application name="dubbo-auto-configure-consumer-demo"/>
    <dubbo:registry address="zookeeper://IP:Port1,IP:Port2"/>
    <dubbo:reference id="userService" check="false" interface="com.hand.user.service.UserService"/>
</beans>

在启动类中新增@ImportResource注解

package com.hand.user;

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

@ImportResource("consumer.xml")
@SpringBootApplication
public class WebApplication {
    public static void main(String[] args) {
        SpringApplication.run(WebApplication.class);
    }
}

使用Spring的@Autowired注解代替@Reference

package com.hand.user.web;

import com.hand.user.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserController {
    @Autowired
    private UserService userService;

    @RequestMapping("/sayHello")
    public String sayHello() {
        return userService.sayHello();
    }
}

GitHub地址:https://github.com/hxt970311/dubbo-springboot-xml-demo

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