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dubbo 实战之三:使用 Zookeeper 注册中心,java 后端工程师面试题

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package com.bolingcavalry.springbootzkprovider;


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-zk-provider, Hello " + name + ", request from consumer: " + RpcContext.getContext().getRemoteAddress());


try {


Thread.sleep(1000);


} catch (InterruptedException e) {


e.printStackTrace();


}


return "I'm springboot-zk-provider, Hello " + name + ", response from provider: " + RpcContext.getContext().getLocalAddress();


}


}


  1. 编写 SpringBoot 启动类 SpringBootZKProviderApplication.java,注意要添加 @EnableDubbo 注解:


package com.bolingcavalry.springbootzkprovider;


import org.apache.dubbo.config.spring.context.annotation.EnableDubbo;


import org.springframework.boot.SpringApplication;


import org.springframework.boot.autoconfigure.SpringBootApplication;


@SpringBootApplication


@EnableDubbo


public class SpringBootZKProviderApplication {


public static void main(String[] args) {


SpringApplication.run(SpringBootZKProviderApplication.class, args);


}


}


  1. 至此服务提供方编码完成,直接在 IDEA 上运行 SpringBootZKProviderApplication 类即可启动服务,启动成功后的日志输出如下图,如红框所示,已连上了 Zookeeper:


[](

)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 | SpringBootZKConsumerApplication.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;


  1. 创建名为 springbootzkconsumer 的子工程,pom.xml 内容如下,同样需要依赖 dubbo-spring-boot-starter 和 dubbo-dependencies-zookeeper:


<?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>springbootzkconsumer</artifactId>


<version>1.0-SNAPSHOT</version>


<name>springbootzkconsumer</name>


<description>Demo project for dubbo service consumer from Spring Boot</description>


<dependencyManagement>


<dependencies>


<dependency>


<groupId>org.springframework.boot</groupId>


<artifactId>spring-boot-dependencies</artifactId>


<version>2.3.3.RELEASE</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.apache.dubbo</groupId>


<artifactId>dubbo-dependencies-zookeeper</artifactId>


<type>pom</type>


</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>


  1. 编写配置文件 application.yml,注意 dubbo.registry.address 的值:


dubbo:


application:


#application-name 本模块名字


name: springboot-zk-consumer


registry:


address: zookeeper://192.168.50.43:2181


server:


port: 8081


  1. 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.springbootzkconsumer.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 (zk registry center mode) : " + demoService.sayHello(name);


}


}


  1. 再编写对外提供 web 服务的 Controller 类:


package com.bolingcavalry.springbootzkconsumer.controller;


import com.bolingcavalry.springbootzkconsumer.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);


}


}


  1. 还要添加 swagger 配置类:


package com.bolingcavalry.springbootzkconsumer;


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.springbootzkconsumer.controller"))


.paths(PathSelectors


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.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(zk 注册中心)")


//创建人


.contact(new Contact("程序员欣宸", "https://github.com/zq2599/blog_demos", "zq2599@gmail.com"))


//版本号


.version("1.0")


//描述


.description("API 描述")


.build();


}


}


  1. 最后是启动类 SpringBootZKConsumerApplication.java:


package com.bolingcavalry.springbootzkconsumer;


import org.apache.dubbo.config.spring.context.annotation.EnableDubbo;


import org.springframework.boot.SpringApplication;


import org.springframework.boot.autoconfigure.SpringBootApplication;


@SpringBootApplication


@EnableDubbo


public class SpringBootZKConsumerApplication {


public static void main(String[] args) {


SpringApplication.run(SpringBootZKConsumerApplication.class, args);


}


}


  1. 至此,服务消费方编码完成,直接在 IDEA 上运行 SpringBootZKConsumerApplication 类即可启动,如下图,可见服务消费方也连接 Zookeeper 成功:



  1. 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:



  1. 如下图,输入 web 接口参数发起请求:



  1. 下图红框中就是响应的数据,内容是 springbootzkconsumer 远程调用 springbootzkprovider 的服务得到的:


[](

)查看 Zookeeper 上的数据


  1. 再回顾一下官方的有关 Zookeeper 注册中心中数据的描述,如下图:



  1. 按照上述信息,咱们去 Zookeeper 看看数据,验证和上图是否一致,登录 Zookeeper 后执行 zkCli.sh 进度交互模式;

  2. 查看根目录,果然有名为 dubbo 的子目录:

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dubbo实战之三:使用Zookeeper注册中心,java后端工程师面试题