Dubbo详解(一):Dubbo介绍和SpringBoot整合Dubbo+ZooKeeper

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

Dubbo详解(一):Dubbo介绍和SpringBoot整合Dubbo+ZooKeeper_第1张图片
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:
Dubbo详解(一):Dubbo介绍和SpringBoot整合Dubbo+ZooKeeper_第2张图片

1)、user-api:API通用接口

public interface UserService {
    String sayHello();
}

2)、user-service:服务提供者

pom.xml:



    
        dubbo
        com.hand
        1.0-SNAPSHOT
    
    4.0.0

    user-service

    
        2.1.1.RELEASE
        2.7.3
    

    
        
            
            
                org.springframework.boot
                spring-boot-dependencies
                ${spring-boot.version}
                pom
                import
            

            
            
                org.apache.dubbo
                dubbo-dependencies-bom
                ${dubbo.version}
                pom
                import
            

            
                org.apache.dubbo
                dubbo
                ${dubbo.version}
                
                    
                        org.springframework
                        spring
                    
                    
                        javax.servlet
                        servlet-api
                    
                    
                        log4j
                        log4j
                    
                
            
        
    

    
        
            org.springframework.boot
            spring-boot-starter
        
        
            com.hand
            user-api
            1.0-SNAPSHOT
        
        
        
            org.apache.dubbo
            dubbo-spring-boot-starter
            ${dubbo.version}
        
        
            org.apache.dubbo
            dubbo
        

        
        
            org.apache.dubbo
            dubbo-dependencies-zookeeper
            ${dubbo.version}
            pom
            
                
                    org.slf4j
                    slf4j-log4j12
                
            
        
    

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:



    
        dubbo
        com.hand
        1.0-SNAPSHOT
    
    4.0.0

    user-web

    
        2.1.1.RELEASE
        2.7.3
    

    
        
            
            
                org.springframework.boot
                spring-boot-dependencies
                ${spring-boot.version}
                pom
                import
            
            
            
                org.apache.dubbo
                dubbo-dependencies-bom
                ${dubbo.version}
                pom
                import
            
            
                org.apache.dubbo
                dubbo
                ${dubbo.version}
                
                    
                        org.springframework
                        spring
                    
                    
                        javax.servlet
                        servlet-api
                    
                    
                        log4j
                        log4j
                    
                
            
        
    

    
        
            com.hand
            user-api
            1.0-SNAPSHOT
        
        
        
            org.apache.dubbo
            dubbo-spring-boot-starter
            ${dubbo.version}
        
        
            org.apache.dubbo
            dubbo
            ${dubbo.version}
        
        
            org.springframework.boot
            spring-boot-starter
        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
        
            org.apache.dubbo
            dubbo-dependencies-zookeeper
            ${dubbo.version}
            pom
            
                
                    org.slf4j
                    slf4j-log4j12
                
            
        
    

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


    
    
    
    
    

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


    
    
    

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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