关于后端:如何基于-Spring-Boot-快速开发一个-Dubbo-微服务应用

Dubbo 还提供了包含XML、API等多种启动与接入形式，更多开发方式和配置细节可参见配置手册。

下载示例代码

残缺示例代码在 dubbo-samples 中。

下载源码

git clone -b master https://github.com/apache/dubbo-samples.git

进入示例目录

cd dubbo-samples/1-basic/dubbo-samples-spring-bootls # 查看目录构造

疾速运行示例

编译 Provider
在 dubbo-samples-spring-boot 目录执行 maven 命令
```
mvn clean package
```

运行 Provider
进入 dubbo-samples-spring-boot-provider/target 目录并启动 java 过程

cd ./dubbo-samples-spring-boot-providerjava -jar ./target/dubbo-samples-spring-boot-provider-1.0-SNAPSHOT.jar

运行 consumer
进入 dubbo-samples-spring-boot-consumer 目录并启动 java 过程
```
java -jar ./target/dubbo-samples-spring-boot-consumer-1.0-SNAPSHOT.jar
```
查看后果
在 consumer 侧会输入如下信息：
```
result: Hello World
```
在 provider 侧会输入如下信息：
```
Hello World, request from consumer: xxx.xxx.xxx.xxx
```

至此就把 Dubbo 的基本功能都实现了，能够在 Dubbo 的根底上进行更多的开发。

示例外围流程

对于示例的更具体解读可参见注解配置

1. 定义服务接口

dubbo-samples-spring-boot-interface/DemoService.java

package org.apache.dubbo.samples.basic.api;public interface DemoService {    String sayHello(String name);}

2. 提供方实现接口并裸露服务

dubbo-samples-spring-boot-provider/DemoServiceImpl.java

@DubboServicepublic class DemoServiceImpl implements DemoService {    @Override    public String sayHello(String name) {        System.out.println("Hello " + name + ", request from consumer: " + RpcContext.getContext().getRemoteAddress());        return "Hello " + name;    }}

3. 配置 application.yml 文件

dubbo-samples-spring-boot-provider/resources/application.yml

dubbo:  application:    name: dubbo-springboot-demo-provider  protocol:    name: dubbo    port: -1  registry:    id: zk-registry    address: zookeeper://127.0.0.1:2181  config-center:    address: zookeeper://127.0.0.1:2181  metadata-report:    address: zookeeper://127.0.0.1:2181

4. 定义 Spring Boot 主函数

dubbo-samples-spring-boot-provider/ProviderApplication.java

@SpringBootApplication@EnableDubbopublic class ProviderApplication {    public static void main(String[] args) throws Exception {        new EmbeddedZooKeeper(2181, false).start();        SpringApplication.run(ProviderApplication.class, args);        System.out.println("dubbo service started");        new CountDownLatch(1).await();    }}

其中，@EnableDubbo 必须配置。

5. 援用近程服务

dubbo-samples-spring-boot-consumer/ConsumerApplication.java

public class ConsumerApplication {    @DubboReference    private DemoService demoService;}

6. 定义 application.yml

dubbo-samples-spring-boot-consumer/application.yml

dubbo:  application:    name: dubbo-springboot-demo-consumer  protocol:    name: dubbo    port: -1  registry:    id: zk-registry    address: zookeeper://127.0.0.1:2181  config-center:    address: zookeeper://127.0.0.1:2181  metadata-report:    address: zookeeper://127.0.0.1:2181

7. 加载 Spring 配置，并调用近程服务

dubbo-samples-spring-boot-consumer/ConsumerApplication.java

@SpringBootApplication@Service@EnableDubbopublic class ConsumerApplication {    @DubboReference    private DemoService demoService;        public String doSayHello(String name) {        return demoService.sayHello(name);    }    public static void main(String[] args) {        ConfigurableApplicationContext context = SpringApplication.run(ConsumerApplication.class, args);        ConsumerApplication application = context.getBean(ConsumerApplication.class);        String result = application.doSayHello("world");        System.out.println("result: " + result);    }}

其中，@EnableDubbo 必须配置。

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