spring-boot 速成(7) 集成dubbo

github上有一个开源项目spring-boot-starter-dubbo 提供了spring-boot与dubbo的集成功能，直接拿来用即可。（记得给作者点赞，以示感谢！）

下面是使用步骤，先看下工程的大致结构：

一、引入相关的依赖项

subprojects {
    buildscript {
        ext {
            springBootVersion = '1.5.3.RELEASE'
        }
        repositories {
            mavenLocal()
            maven {
                url "http://maven.aliyun.com/nexus/content/groups/public/"
            }
            mavenCentral()
        }
        dependencies {
            classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
        }
    }

    apply plugin: "java"
    apply plugin: "maven"
    apply plugin: 'idea'


    targetCompatibility = 1.8
    sourceCompatibility = 1.8

    repositories {
        mavenLocal()
        maven {
            url "http://maven.aliyun.com/nexus/content/groups/public/"
        }
        mavenCentral()
    }

    configurations.all {
        resolutionStrategy.cacheChangingModulesFor 1, "minutes"
    }

    dependencies {
        compile('io.dubbo.springboot:spring-boot-starter-dubbo:1.0.0')
        compile('org.springframework.boot:spring-boot-starter-web:1.5.3.RELEASE')
    }
}

这是最外层根目录下的build.gradle，关键地方就是最后dependencies引入的2个依赖项

二、service-api中定义接口

package com.cnblogs.yjmyzz.service.api;

/**
 * Created by 菩提树下的杨过(http:/yjmyzz.cnblogs.com) on 2017/5/21.
 */
public interface DemoService {
    String hello(String nickName);
}

这一步平淡无奇，没什么好说的

三、service-provider

3.1 提供接口实现

package com.cnblogs.yjmyzz.service.impl;

import com.alibaba.dubbo.config.annotation.Service;
import com.cnblogs.yjmyzz.service.api.DemoService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Created by 菩提树下的杨过(http:/yjmyzz.cnblogs.com) on 2017/5/21.
 */
@Service(version = "1.0.0")
public class DemoServiceImpl implements DemoService {

    Logger logger = LoggerFactory.getLogger(DemoServiceImpl.class);

    public String hello(String nickName) {
        logger.info(nickName + " call me!");
        return String.format("hi , %s!", nickName);
    }
}

常规套路，不用多说

3.2 编写ServiceProvider主类

package com.cnblogs.yjmyzz.service;

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

/**
 * Created by yangjunming on 2017/5/21.
 */
@SpringBootApplication
public class ServiceProvider {
    public static void main(String[] args) {
        SpringApplication.run(ServiceProvider.class, args);
    }
}

仍然是spring-boot的经典套路，跟dubbo也没任何关系

3.3 application.yml配置

server:
  port: 8001

spring:
  dubbo:
    scan: com.cnblogs.yjmyzz.service
    application:
      name: provider
    registry:
      address: zookeeper://127.0.0.1:2181
    protocol:
      name: dubbo
      port: 20880

这里是重点，指定了dubbo服务提供方启动所需的zk注册地址，协议类型及端口，包括扫描的包。

四、service-consumer

4.1 定义一个辅助用的Proxy

package com.cnblogs.yjmyzz.service.proxy;

import com.alibaba.dubbo.config.annotation.Reference;
import com.cnblogs.yjmyzz.service.api.DemoService;
import org.springframework.stereotype.Component;

/**
 * Created by yangjunming on 2017/5/21.
 */
@Component
public class ServiceProxy {

    @Reference(version = "1.0.0")
    public DemoService demoService;
}

就是一个标准的spring组件(不管是叫proxy还是叫container都无所谓，随个人喜好)，在该组件中持有对Service的引用实例，注意：如果指定了version，则该版本号要与service-provider中的版本号一致

4.2 调用服务

package com.cnblogs.yjmyzz.service;

import com.cnblogs.yjmyzz.service.proxy.ServiceProxy;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;

/**
 * Created by 菩提树下的杨过(http:/yjmyzz.cnblogs.com) on 2017/5/21.
 */
@SpringBootApplication
public class ServiceConsumer {

    public static void main(String[] args) {
        ConfigurableApplicationContext ctx = SpringApplication.run(ServiceConsumer.class, args);
        ServiceProxy proxy = ctx.getBean(ServiceProxy.class);
        System.out.println(proxy.demoService.hello("菩提树下的杨过"));//调用服务
    }
}

一看即明，不多解释。

4.3 application.yml配置

server:
  port: 8002

spring:
  dubbo:
    scan: com.cnblogs.yjmyzz.service
    application:
      name: consumer
    registry:
      address: zookeeper://127.0.0.1:2181

ok，搞定！

上述示例源代码，已托管至github，有需要的朋友自行下载：https://github.com/yjmyzz/spring-boot-dubbo-demo