基于SpringBoot2.0.x+Dubbo2.6.x+zookeeper3.4.1x创建RPC服务

叁歲伎倆 2022-05-12 01:58 67阅读 0赞

由于公司使用的是springboot+dubbo的分布式架构，虽然个人更偏向于springcloud，但是日常中使用dubbo更多，所以也参考了很多的资料，自己搭建了一个基于目前最新版本的RPC服务demo。（springboot 2.0.5+dubbo2.6.3+zookeeper3.4.10）用来熟悉dubbo和学习相关技术，把搭建过程记录下来，防止自己和他人踩坑。

下图是dubbo官网给的图。在系统越来越庞大的情况下，分布式就显得尤为重要了，应用之间交互是不可避免的，将核心业务抽取出来，作为独立的服务，然后逐渐形成稳定的服务中心，使前端应用能更快速的响应多变的市场需求。此时，用于提高业务复用及整合的分布式服务框架(RPC)是关键。

![70][]

在项目搭建之前首先需要一个注册中心，dubbo推荐使用zookeeper，所以我这里使用的也是zookeeper，下载地址：[http://zookeeper.apache.org/][http_zookeeper.apache.org]。下载完成后解压就行。不会的参考：[http://dubbo.apache.org/zh-cn/docs/admin/install/zookeeper.html][http_dubbo.apache.org_zh-cn_docs_admin_install_zookeeper.html]

首先使用idea创建一个空的springboot项目用来做多模块的父工程：spring-boot-dubbo-parent。这里要注意把打包方式改为pom类型。代码如下：

然后在父工程下创建一个module：spring-boot-dubbo-api。用来存放所有的公共接口。pom文件同上，打包类型为jar。

再创建一个服务生产者：spring-boot-dubbo-provider。这里需要添加dubbo以及zookeeper的包，同时使用dubbo官方给出的starter。github地址：[https://github.com/apache/incubator-dubbo-spring-boot-project][https_github.com_apache_incubator-dubbo-spring-boot-project]（不是alibaba的那个，那个不维护了。）同时引入刚才创建的api。

<?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">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.wangzc</groupId>
        <artifactId>spring-boot-dubbo-provider</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
    
        <name>spring-boot-dubbo-provider</name>
        <description>Demo project for Spring Boot</description>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.0.5.RELEASE</version>
            <relativePath/> 
        </parent>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
    
            <dependency>
                <groupId>com.wangzc</groupId>
                <artifactId>spring-boot-dubbo-api</artifactId>
                <version>0.0.1-SNAPSHOT</version>
            </dependency>
    
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>dubbo</artifactId>
                <version>2.6.3</version>
            </dependency>
    
            <dependency>
                <groupId>org.apache.zookeeper</groupId>
                <artifactId>zookeeper</artifactId>
                <version>3.4.10</version>
                <exclusions>
                    <exclusion>
                        <groupId>org.slf4j</groupId>
                        <artifactId>slf4j-log4j12</artifactId>
                    </exclusion>
                    <exclusion>
                        <groupId>log4j</groupId>
                        <artifactId>log4j</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
    
            <dependency>
                <groupId>com.alibaba.boot</groupId>
                <artifactId>dubbo-spring-boot-starter</artifactId>
                <version>0.2.0</version>
            </dependency>
    
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

最后一个就是服务消费者了：spring-boot-dubbo-consumer。pom文件同上，多了一个web包。

<dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

parent的pom文件引入3个module

<modules>
        <module>spring-boot-dubbo-api</module>
        <module>spring-boot-dubbo-provider</module>
        <module>spring-boot-dubbo-consumer</module>
    </modules>

这里就用dubbo官网给出的最简单的sayHello例子用来验证服务是否发布成功，在api的module包下创建一个接口用来提供服务。

package com.FarStars.springbootdubboapi.service;
    
    /**
     * @author FarStars
     * @date 2018/9/13
     */
    public interface HelloService {
    
        /**
         * sayHello
         *
         * @author FarStars
         * @param name name
         * @return java.lang.String
         */
        String sayHello(String name);
    
    }

provider的application.properties配置文件：

# Spring boot application
    spring.application.name = spring-boot-dubbo-provider
    server.port = 9090
    management.port = 9091
    
    # Service version
    provider.service.version = 1.0.0
    
    # Base packages to scan Dubbo Components (e.g @Service , @Reference)
    # 实现类的包路径（换成自己的）
    dubbo.scan.basePackages  = com.xxx.springbootdubboprovider.impl
    
    # Dubbo Config properties
    ## ApplicationConfig Bean
    dubbo.application.id = dubbo-provider
    dubbo.application.name = dubbo-provider
    
    ## ProtocolConfig Bean
    dubbo.protocol.id = dubbo
    dubbo.protocol.name = dubbo
    dubbo.protocol.port = 20880
    
    ## RegistryConfig Bean
    dubbo.registry.id = my-registry
    # zookeeper的地址（换成自己的）
    dubbo.registry.address = zookeeper://xxx:2181

HelloService的实现类,注意这里要用dubbo的service注解，不是spring的。

package com.FarStars.springbootdubboprovider.impl;
    
    import com.alibaba.dubbo.config.annotation.Service;
    import com.FarStars.springbootdubboapi.service.HelloService;
    
    /**
     * @author FarStars
     * @date 2018/9/13
     */
    @Service(
            version = "${provider.service.version}",
            application = "${dubbo.application.id}",
            protocol = "${dubbo.protocol.id}",
            registry = "${dubbo.registry.id}"
    )
    public class HelloServiceImpl implements HelloService {
    
        /**
         * sayHello
         *
         * @param name name
         * @return java.lang.String
         * @author FarStars
         */
        @Override
        public String sayHello(String name) {
            return "Hello, " + name;
        }
    }

consumer的application.properties配置文件：

# Spring boot application
    spring.application.name = spring-boot-dubbo-consumer
    server.port = 8080
    management.port = 8081
    
    # Service Version
    consumer.service.version = 1.0.0
    
    # Dubbo Config properties
    ## ApplicationConfig Bean
    dubbo.application.id = dubbo-consumer
    dubbo.application.name = dubbo-consumer
    
    ## ProtocolConfig Bean
    dubbo.protocol.id = dubbo
    dubbo.protocol.name = dubbo
    dubbo.protocol.port = 20880

HelloController类：

package com.FarStars.springbootdubboconsumer.controller;
    
    import com.alibaba.dubbo.config.annotation.Reference;
    import com.FarStars.springbootdubboapi.service.HelloService;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.RestController;
    
    /**
     * @author FarStars
     * @date 2018/9/13
     */
    @RestController
    public class HelloController {
    
        @Reference(
                version = "${consumer.service.version}",
                application = "${dubbo.application.id}",
                url = "dubbo://localhost:20880"
        )
        private HelloService helloService;
    
        @RequestMapping("/sayHello")
        public String sayHello(@RequestParam String name) {
            return helloService.sayHello(name);
        }
    }

启动类上要加controller包扫描

@SpringBootApplication(scanBasePackages =     
        "com.FarStars.springbootdubboconsumer.controller")

这样就算搭建完成了，测试时先启动provider，再启动consumer。

示例 `Controller` : [http://localhost:8080/sayHello?name=FarStars][http_localhost_8080_sayHello_name_FarStars]  网页输出如下，表示服务发布成功![70 1][]

本文参考：dubbo官网：[http://dubbo.apache.org/zh-cn/index.html][http_dubbo.apache.org_zh-cn_index.html]

starter中文文档：[https://github.com/apache/incubator-dubbo-spring-boot-project/blob/master/README\_CN.md][https_github.com_apache_incubator-dubbo-spring-boot-project_blob_master_README_CN.md]

也可以引入actuator包检查健康状态，请参考以上文档。

（本人才疏学浅，如有错误纯属正常，欢迎指出！）

[70]: /images/20220512/21e8fd52b36743c383876e637c4b3621.png
[http_zookeeper.apache.org]: http://zookeeper.apache.org/
[http_dubbo.apache.org_zh-cn_docs_admin_install_zookeeper.html]: http://dubbo.apache.org/zh-cn/docs/admin/install/zookeeper.html
[https_github.com_apache_incubator-dubbo-spring-boot-project]: https://github.com/apache/incubator-dubbo-spring-boot-project
[http_localhost_8080_sayHello_name_FarStars]: http://localhost:8080/sayHello?name=FarStars
[70 1]: /images/20220512/2b18c77245ee48f296cdcafb702bdab6.png
[http_dubbo.apache.org_zh-cn_index.html]: http://dubbo.apache.org/zh-cn/index.html
[https_github.com_apache_incubator-dubbo-spring-boot-project_blob_master_README_CN.md]: https://github.com/apache/incubator-dubbo-spring-boot-project/blob/master/README_CN.md