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《dubbo实战》系列导航
- 准备和初体验
- 与SpringBoot集成
- 使用Zookeeper注册中心
- 管理控制台dubbo-admin
本篇概览
- 本文是《dubbo实战》系列的第二篇,一起来实战SpringBoot(2.3.3.RELEASE版本)与dubbo的集成,这也是分布式服务的常用技术组合,本文由以下内容组成:
- 创建子工程springbootmulticastprovider,对外提供服务;
- 创建子工程springbootmulticastconsumer,启动后提供一个web接口,咱们调用这个web接口时,springbootmulticastconsumer会远程调用springbootmulticastprovider提供的服务,如下图:
- 本篇的实战暂不使用注册中心,而是服务提供方启动时广播自己的地址,再由消费方启动时订阅,并随时远程调用,调用逻辑如下图所示:
源码下载
- 如果您不想编码,可以在GitHub下载所有源码,地址和链接信息如下表所示:
- 这个git项目中有多个文件夹,本章的应用在dubbopractice文件夹下,如下图红框所示:
- dubbopractice是父子结构的工程,本篇的代码在springbootmulticastprovider和springbootmulticastconsumer这两个子工程中,如下图:
编码(服务提供方)
- 先创建提供服务的工程springbootmulticastprovider,一共要创建4个文件,创建顺序和功能如下表:
创建顺序 |
文件名 |
作用 |
1 |
pom.xml |
工程的pom文件 |
2 |
src/main/resources/application.yml |
配置文件 |
3 |
DemoServiceImpl.java |
提供具体的服务 |
4 |
SpringBootMulticastProviderApplication.java |
启动类 |
- 创建名为springbootmulticastprovider的子工程,pom.xml内容如下,要重点关注的是新增依赖dubbo-spring-boot-starter,这就是dubbo在SpringBoot环境的starter依赖:
dubbopractice
com.bolingcavalry
1.0-SNAPSHOT
4.0.0
com.bolingcavalry
springbootmulticastprovider
1.0-SNAPSHOT
springbootmulticastprovider
Demo project for dubbo service provider from Spring Boot, multicast mode
org.springframework.boot
spring-boot-dependencies
${springboot.version}
pom
import
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-test
test
com.bolingcavalry
practiceinterface
${project.version}
org.projectlombok
lombok
org.apache.dubbo
dubbo-spring-boot-starter
org.springframework.boot
spring-boot-maven-plugin
${springboot.version}
- 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 |
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 |
- 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:
dubbopractice
com.bolingcavalry
1.0-SNAPSHOT
4.0.0
com.bolingcavalry
springbootmulticastconsumer
1.0-SNAPSHOT
springbootmulticastconsumer
Demo project for dubbo service consumer from Spring Boot, multicast mode
org.springframework.boot
spring-boot-dependencies
${springboot.version}
pom
import
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-test
test
io.springfox
springfox-swagger2
io.springfox
springfox-swagger-ui
com.bolingcavalry
practiceinterface
${project.version}
org.projectlombok
lombok
org.apache.dubbo
dubbo-spring-boot-starter
org.springframework.boot
spring-boot-maven-plugin
${springboot.version}
- 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;
import springfox.documentation.service.Contact;
import springfox.documentation.service.Tag;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
@Configuration
@EnableSwagger2
public class SwaggerConfig {
@Bean
public Docket createRestApi() {
return new Docket(DocumentationType.SWAGGER_2)
.apiInfo(apiInfo())
.tags(new Tag("DemoController", "演示服务"))
.select()
// 当前包路径
.apis(RequestHandlerSelectors.basePackage("com.bolingcavalry.springbootmulticastconsumer.controller"))
.paths(PathSelectors.any())
.build();
}
//构建 api文档的详细信息函数,注意这里的注解引用的是哪个
private ApiInfo apiInfo() {
return new ApiInfoBuilder()
//页面标题
.title("dubbo远程调用服务的操作(广播模式)")
//创建人
.contact(new Contact("程序员欣宸", "https://github.com/zq2599/blog_demos", "[email protected]"))
//版本号
.version("1.0")
//描述
.description("API 描述")
.build();
}
}
- 最后是启动类SpringBootMulticastConsumerApplication.java:
package com.bolingcavalry.springbootmulticastconsumer;
import org.apache.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@EnableDubbo
public class SpringBootMulticastConsumerApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootMulticastConsumerApplication.class, args);
}
}
- 至此,服务消费方编码完成,直接在IDEA上运行SpringBootMulticastConsumerApplication类即可启动;
- 通过浏览器访问swagger,地址是:http://localhost:8081/swagger-ui.html ,如下图,点击红框位置展开接口详情:
- 如下图,输入web接口参数发起请求:
- 下图红框中就是响应的数据,内容是springbootmulticastconsumer远程调用springbootmulticastprovider的服务得到的:
- 至此,dubbo与springboot集成的实战就完成了,希望能给您提供一些参考,助您快速开发dubbo应用;
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