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 |
- 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：
<project xmlns="maven.apache.org/POM/4.0.0"
xmlns:xsi="www.w3.org/2001/XMLSch…"
xsi:schemaLocation="maven.apache.org/POM/4.0.0 maven.apache.org/xsd/maven-4…
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 {
最后
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其实面试这一块早在第一个说的25大面试专题就全都有的。以上提及的这些全部的面试+学习的各种笔记资料，我这差不多来回搞了三个多月，收集整理真的很不容易，其中还有很多自己的一些知识总结。正是因为很麻烦，所以对以上这些学习复习资料感兴趣
相关阅读docs.qq.com/doc/DSmxTbFJ1cmN1R2dB
