springboot快速集成dubbo

当springboot和dubbo走到了一起，那么如何让它两更快更容易的集成在一起呢？dubbo-spring-boot-starter帮助我们做到了这点，它实现了dubbo在springboot项目中自动配置（@EnableAutoConfiguration）。

dubbo-spring-boot-starter模块

dubbo-spring-boot-starter主要由以下部分内容组成：

• dubbo-spring-boot-parent 模块主要管理 Dubbo Spring Boot 工程的 Maven 依赖；
• dubbo-spring-boot-autoconfigure 模块提供 Spring Boot’s @EnableAutoConfiguration 的实现 - DubboAutoConfiguration， 它简化了 Dubbo 核心组件的装配；
• dubbo-spring-boot-actuator 提供 Production-Ready 特性：健康检查、控制断点、外部化配置等；

dubbo-starter方式集成dubbo案例

现在通过一个案例来看springboot使用dubbo-spring-boot-starter来集成dubbo是多么简单的事儿。

这里通过dubbo直连的方式，不引入注册中心。

首先在项目POM文件中中引入如下信息（制定dubbo的版本号以及dubbo的依赖管理）：

<properties>
    <dubbo.version>2.7.0</dubbo.version>
</properties>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-dependencies</artifactId>
            <version>${spring-boot.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-dependencies-bom</artifactId>
            <version>${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>

然后定义一个公共的server-api：

public interface HelloService {

    String hello(String name);
}

springboot-dubbo-provider

在服务提供者中引入如下依赖：

<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>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
</dependency>

在application.yml文件中设置dubbo的简单配置：

spring:
  application:
    name: springboot-dubbo-provider

dubbo:
#  application:
#    name: #defualt is ${spring.application.name}
  protocol:
    name: dubbo
    port: 28080
  registry:
    address: N/A
  scan:
    base-packages: com.lazycece.sbac.dubbo.provider.service
  provider:
    group: demo

HelloSerice服务提供信息如下：

package com.lazycece.sbac.dubbo.provider.service;

import com.lazycece.sbac.dubbo.api.HelloService;
import org.apache.dubbo.config.annotation.Service;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

/**
 * @author lazycece
 * @date 2019/03/30
 */
@Component
@Service(version = "1.0.0", timeout = 3000)
public class HelloServiceImpl implements HelloService {

    @Value("${dubbo.application.name}")
    private String serviceName;

    @Override
    public String hello(String name) {
        return String.format("Hello, %s ! the service is %s", name, serviceName);
    }
}

springboot-dubbo-consumer

在服务消费者中引入如下依赖：

<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>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

在application.yml文件中设置dubbo的简单配置：

spring:
  application:
    name: springboot-dubbo-consumer
dubbo:
  consumer:
    group: demo

HelloSerice服务消费案例代码如下：

package com.lazycece.sbac.dubbo.consumer.controller;

import com.lazycece.sbac.dubbo.api.HelloService;
import org.apache.dubbo.config.annotation.Reference;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author lazycece
 * @date 2019/03/30
 */
@RestController
public class HelloController {

    @Reference(version = "1.0.0", url = "dubbo://127.0.0.1:28080")
    private HelloService helloService;

    @GetMapping("/hello/{name}")
    public String hello(@PathVariable String name) {
        return helloService.hello(name);
    }
}

结果验证

在浏览器访问如下地址：http://localhost:8080/hello/lazycece

输出信息为： Hello, lazycece ! the service is springboot-dubbo-provider

案例代码

案例代码地址：https://github.com/lazycece/springboot-actual-combat/tree/master/springboot-ac-dubbo