dubbo 实战之二：与 SpringBoot 集成
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-spring-boot-starter</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>${springboot.version}</version>
</plugin>
</plugins>
</build>
</project>
配置文件 application.yml，要注意的是 registry.address 的配置是广播模式：
dubbo:
application:
#application-name 本模块名字
name: springboot-multicast-provider
id: springboot-multicast-provider
registry:
address: multicast://224.5.6.7:1234
id: registry
protocol:
name: dubbo
port: 20880
编写服务实现类 DemoServiceImpl.java，注意 @Service 注解将当前类的实例作为远程服务对外暴露：
package com.bolingcavalry.springbootmulticastprovider;
import com.bolingcavalry.dubbopractice.service.DemoService;
import lombok.extern.slf4j.Slf4j;
import org.apache.dubbo.config.annotation.Service;
import org.apache.dubbo.rpc.RpcContext;
@Slf4j
@Service
public class DemoServiceImpl implements DemoService {
@Override
public String sayHello(String name) {
log.info("I'm springboot-multicast-provider, Hello " + name + ", request from consumer: " + RpcContext.getContext().getRemoteAddress());
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
return "I'm springboot-multicast-provider, Hello " + name + ", response from provider: " + RpcContext.getContext().getLocalAddress();
}
}
编写 SpringBoot 启动类 SpringBootMulticastProviderApplication.java，注意要添加 @EnableDubbo 注解：
package com.bolingcavalry.springbootmulticastprovider;
import org.apache.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@EnableDubbo
public class SpringBootMulticastProviderApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootMulticastProviderApplication.class, args);
}
}
至此服务提供方编码完成，直接在 IDEA 上运行 SpringBootMulticastProviderApplication 类即可启动服务，启动成功后的日志输出如下图：
[](()编码(服务消费方)
现在网络上已经有了服务，咱们再来编写服用消费方的代码，一共要创建 6 个文件，创建顺序和功能如下表：
| 创建顺序 | 文件名 | 作用 |
| --- | --- | --- |
| 1 | 《一线大厂 Java 面试题解析+后端开发学习笔记+最新架构讲解视频+实战项目源码讲义》无偿开源 威信搜索公众号【编程进阶路】 pom.xml | 工程的 pom 文件 |
| 2 | src/main/resources/application.yml | 配置文件 |
| 3 | RemoteInvokeServiceImpl.java | service 层，在这里远程调用服务提供方的服务 |
| 4 | DemoController.java | web 接口类，对外提供 web 服务 |
| 5 | SwaggerConfig.java | swagger 配置类，便于通过页面测试接口 |
| 6 | SpringBootMulticastConsumerApplication.java | 启动类 |
完整的文件位置如下图：
接下来逐个创建上述文件；
创建名为 springbootmulticastconsumer 的子工程，pom.xml 内容如下，同样需要依赖 dubbo-spring-boot-starter：
<?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>dubbopractice</artifactId>
<groupId>com.bolingcavalry</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<groupId>com.bolingcavalry</groupId>
<artifactId>springbootmulticastconsumer</artifactId>
<version>1.0-SNAPSHOT</version>
<name>springbootmulticastconsumer</name>
<description>Demo project for dubbo service consumer from Spring Boot, multicast mode</description>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>${springboot.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
</dependency>
<dependency>
<groupId>com.bolingcavalry</groupId>
<artifactId>practiceinterface</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-spring-boot-starter</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>${springboot.version}</version>
</plugin>
</plugins>
</build>
</project>
编写配置文件 application.yml，注意 dubbo.registry.address 的值，除了是广播模式，还要添加 unicast=false，这样才能保证多个消费者进程都能收到广播：
dubbo:
application:
name: springboot-multicast-consumer
id: springboot-multicast-consumer
qosEnable: false
registry:
address: multicast://224.5.6.7:1234?unicast=false
id: registry
protocol:
name: dubbo
port: 20880
server:
port: 8081
编写调用远程服务的代码，如下，可见如果想调用远程服务，只要对接口做 @Reference 注释即可，另外还通过 timeout 属性增加了超时配置：
package com.bolingcavalry.springbootmulticastconsumer.service;
import com.bolingcavalry.dubbopractice.service.DemoService;
import org.apache.dubbo.config.annotation.Reference;
import org.springframework.stereotype.Service;
@Service
public class RemoteInvokeServiceImpl {
@Reference(timeout = 2000)
private DemoService demoService;
public String sayHello(String name) {
return "from dubbo remote (multicast mode) : " + demoService.sayHello(name);
}
}
再编写对外提供 web 服务的 Controller 类：
package com.bolingcavalry.springbootmulticastconsumer.controller;
import com.bolingcavalry.springbootmulticastconsumer.service.RemoteInvokeServiceImpl;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/demo")
@Api(tags = {"DemoController"})
public class DemoController {
@Autowired
private RemoteInvokeServiceImpl remoteInvokeService;
@ApiOperation(value = "获取 dubbo service provider 的响应", notes=""获取 dubbo service provider 的响应")
@ApiImplicitParam(name = "name", value = "昵称", paramType = "path", required = true, dataType = "String")
@RequestMapping(value = "/{name}", method = RequestMethod.GET)
public String sayHello(@PathVariable String name){
return remoteInvokeService.sayHello(name);
}
}
还要添加 swagger 配置类：
package com.bolingcavalry.springbootmulticastconsumer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
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