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Dubbo配合SpringBoot，实现接口多个实现(group)

SpringBoot配合Dubbo，使用@Service和@Reference，group实现接口多实现

公司项目升级，需要实现springBoot + Dubbo，并支持一个接口多个实现的情况。遇到了几个坑，在这里记录下。

1. 安装Zookeeper

在官网上下载最新版本3.5.6(注意下载 bin 包)

将下载好的压缩包，解压到对应目录

cd apache-zookeeper-3.5.6-bin/conf/ // 切换到配置目录

mv zoo_sample.cfg zoo.cfg //更改默认配置文件名称

vi zoo.cfg // 编辑配置文件，自定义dataDir，我的配置贴在下面

这里会遇到第一个坑：zk从3.5.5开始，带有bin名称的包才是我们想要的下载可以直接使用的里面有编译后的二进制的包，而tar.gz的包里面是只是源码，无法直接使用。不小心下了 apache-zookeeper-3.5.6.tar.gz 这个包，启动时会报错"错误: 找不到或无法加载主类 org.apache.zookeeper.server.quorum.QuorumPeerMain"。

zoo.cfg

# 发送心跳的间隔时间， 毫秒为单位
tickTime=2000
# 集群用到，初始化连接时，leader最多能容忍client多少个心跳间隔，默认是10，就代表10*2000=20000 ， 毫秒
initLimit=10
# 集群用到，正常通信时，如果client超过此时间间隔没有心跳
syncLimit=5
# 保存数据的目录
dataDir=/Users/ouitsu/document/apache-zookeeper-3.5.6-bin/data
# 暴露的接口
clientPort=2181
# zk3.5的新特性，Zookeeper AdminServer，默认端口是8080，坑的一批
admin.serverPort=12181

这里是第二个坑，zk的Zookeeper AdminServer默认端口和Dubbo admin默认端口冲突，会报错：Unable to start AdminServer, exiting abnormally org.apache.zookeeper.server，在这里定义端口即可解决。

配置完成，开始启动zk

cd到zookeeper的bin目录下

./zkServer.sh start 启动

./zkServer.sh stop 停止

开始搭建项目

1. 生产者

目录结构如下：

provider_pom文件如下

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.uaepay.pay.channel</groupId>
    <artifactId>dubbo_provider</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>dubbo_provider</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.alibaba.spring.boot</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>2.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>uaepay.cmf.channel</groupId>
            <artifactId>dubbo_facade</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>io.projectreactor</groupId>
            <artifactId>reactor-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.101tec</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.10</version>
        </dependency>
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.12</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.2.0.RELEASE</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
        </repository>
    </repositories>

</project>

provider_application:

package com.uaepay.pay.channel.dubbo_provider;

import com.alibaba.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@EnableDubbo  //启动dubbo的配置
public class DubboProviderApplication {

    public static void main(String[] args) {
        SpringApplication.run(DubboProviderApplication.class, args);
    }

两个生产实现

package com.uaepay.pay.channel.dubbo_provider.service;

import com.alibaba.dubbo.config.annotation.Service; // 这里要注意引用dubbo的Service
import org.springframework.stereotype.Component; // 对应的，使用spring的Component
import uaepay.cmf.channel.MockResponseService;
import uaepay.cmf.channel.vo.User;

@Service(group = "mockResponseServiceImpl") // 定义group
@Component
public class MockResponseServiceImpl implements MockResponseService {

    @Override
    public User getUserInfo() {
        User user = new User();
        user.setUserName("1111");
        return user;
    }
}

package com.uaepay.pay.channel.dubbo_provider.service;

import com.alibaba.dubbo.config.annotation.Service;// 使用alibaba.dubbo的Service注解
import org.springframework.stereotype.Component;// 使用Spring的Component注解
import uaepay.cmf.channel.MockResponseService;
import uaepay.cmf.channel.vo.User;

@Service(group = "mockResponseServiceImpl2") //定义group
@Component
public class MockResponseServiceImpl2 implements MockResponseService {

    @Override
    public User getUserInfo() {
        User user = new User();
        user.setUserName("222222");
        return user;
    }
}

application.properties

dubbo.application.name=dubbo-provider-service
dubbo.registry.address=zookeeper://127.0.0.1:2181
dubbo.protocol.port=20782
dubbo.protocol.dispatcher=message
dubbo.protocol.threadpool=fixed
dubbo.protocol.threads=200
server.port=8871

2. 消费者

目录结构如下：

pom文件

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.uaepay.pay.channel</groupId>
    <artifactId>dubbo_consumer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>dubbo_consumer</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>com.alibaba.spring.boot</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>2.0.0</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>uaepay.cmf.channel</groupId>
            <artifactId>dubbo_facade</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>com.101tec</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.10</version>
        </dependency>
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.12</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.2.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.28</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

ConsumerApplication：

package com.uaepay.pay.channel.dubbo_consumer;

import com.alibaba.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@EnableDubbo
public class DubboConsumerApplication {

    public static void main(String[] args) {
        SpringApplication.run(DubboConsumerApplication.class, args);
    }
}

消费者的实现类

package com.uaepay.pay.channel.dubbo_consumer.service;

import com.alibaba.dubbo.config.annotation.Reference;// 使用Dubbo的reference 获取对应实现
import com.alibaba.fastjson.JSON;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import uaepay.cmf.channel.MockResponseService;

import java.util.LinkedHashMap;
import java.util.TreeMap;

@RestController
@RequestMapping("/test")
public class MockServiceImpl {

    @Reference(group = "mockResponseServiceImpl")//对应定义group
    private MockResponseService mockResponseServiceImpl;

    @Reference(group = "mockResponseServiceImpl2")// 对应定义group
    private MockResponseService mockResponseServiceImpl2;

    @RequestMapping("/getUserInfo")
    public  void getUserInfo(){
        System.out.println("得到的详情为..."+JSON.toJSONString(mockResponseServiceImpl.getUserInfo()));
    }

    @RequestMapping("/getUserInfo1")
    public  void getUserInfo11(){
        System.out.println("得到的详情为..."+JSON.toJSONString(mockResponseServiceImpl2.getUserInfo()));
    }
}

application.properties

dubbo.application.name=dubbo-consumer-service
dubbo.registry.address=zookeeper://127.0.0.1:2181
dubbo.consumer.check=false
server.port=8862

facade包

项目结构如下：

pom文件

<?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>uaepay.cmf.channel</groupId>
  <artifactId>dubbo_facade</artifactId>
  <version>1.0-SNAPSHOT</version>

  <name>dubbo_facade</name>
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <optional>true</optional>
    </dependency>
    <dependency>
      <groupId>commons-lang</groupId>
      <artifactId>commons-lang</artifactId>
      <version>2.4</version>
    </dependency>
  </dependencies>

  <build>
    <pluginManagement>
      <plugins>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-jar-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-site-plugin</artifactId>
          <version>3.7.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-project-info-reports-plugin</artifactId>
          <version>3.0.0</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

实体类

package uaepay.cmf.channel.vo;
import java.io.Serializable;

public class User implements Serializable {
    private String userName;
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
}

接口

package uaepay.cmf.channel;
import uaepay.cmf.channel.vo.User;

public interface MockResponseService {

    public User getUserInfo();

}

运行项目

启动provider

Socket connection established to 127.0.0.1/127.0.0.1:2181, initiating session
Session establishment complete on server 127.0.0.1/127.0.0.1:2181, sessionid = 0x100000dd3c5000c, negotiated timeout = 30000

成功打印出这些，说明生产者已经注册成功，如果未出现，检查一下是不是没引入com.101tec.zkclient的依赖，或者zk是否成功启动。

启动Consumer

<dubbo:reference object="com.alibaba.dubbo.common.bytecode.proxy0@3da222de" singleton="true" interface="uaepay.cmf.channel.MockResponseService" uniqueServiceName="mockResponseServiceImpl/uaepay.cmf.channel.MockResponseService" generic="false" group="mockResponseServiceImpl" listener="" filter="" id="uaepay.cmf.channel.MockResponseService" /> has been built.
<dubbo:reference object="com.alibaba.dubbo.common.bytecode.proxy0@4aae626d" singleton="true" interface="uaepay.cmf.channel.MockResponseService" uniqueServiceName="mockResponseServiceImpl2/uaepay.cmf.channel.MockResponseService" generic="false" group="mockResponseServiceImpl2" listener="" filter="" id="uaepay.cmf.channel.MockResponseService" /> has been built.

成功打印这个，证明消费者配置成功。

如果打印的是 <dubbo:reference singleton="true" interface="uaepay.cmf.channel.MockResponseService..../> 且访问报空指针，打印参数中不包含 object时，说明消费者没有接收到生产者的代理对象。需要检查两个地方：

依赖是否加上了com.101tec.zkclient
application.properties中是否加入了属性 dubbo.consumer.check=false

附加：Dubbo-admin

dubbo提供dubbo的后台管理，在github上下载，拉到本地的项目结构是这样的：

重要的子模块有两个：Dubbo-admin-server和Dubbo-admin-ui

Dubbo-admin-server：
- 默认端口8080
- 是一个springboot项目，直接启动即可
Dubbo-admin-ui：
- 需要使用npm，没安装npm的点这里
- cd到Dubbo-admin-ui路径，npm install 安装依赖
- 依赖安装完成，npm run dev
- 运行成功打开http://localhost:8081 即可

如果有具体步骤不懂，可以查看项目中的README.md(子模块中也有)，写的很详细。

至此，大功告成！

欢迎访问我的个人博客

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原文地址：https://www.cnblogs.com/metabolism/p/11785547.html

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