SpringBoot整合Dubbo+Zookeeper进行分布式搭建系统

QUESTIONl:SpringBoot整合Dubbo+Zookeeper进行分布式搭建系统？

 

ANSWER：

一：创建项目模块

 

1.1.创建一个Empty Project

 

名称:Dubbo

1.2.创建一个Provider模块

这里采用SpringBoot快速搭建。

 

1.3.创建Consumer模块

创建完成后代码架构:

二：provider代码部分

2.1导入provider.xml依赖

 

<?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>2.2.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.xy</groupId>
    <artifactId>provider</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>provider</name>
    <description>Demo project for Spring Boot</description>

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

    <dependencies>

        <!-- https://mvnrepository.com/artifact/org.apache.dubbo/dubbo-spring-boot-starter -->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>2.7.3</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.github.sgroschupf/zkclient -->
        <dependency>
            <groupId>com.github.sgroschupf</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.1</version>
            <exclusions>
                <exclusion>
                    <artifactId>slf4j-log4j12</artifactId>
                    <groupId>org.slf4j</groupId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.curator/curator-framework -->
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>2.13.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-recipes</artifactId>
            <version>2.13.0</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.zookeeper/zookeeper -->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.13</version>
            <exclusions>
                <exclusion>
                    <artifactId>slf4j-log4j12</artifactId>
                    <groupId>org.slf4j</groupId>
                </exclusion>
            </exclusions>
        </dependency>

        <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>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

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

</project>

 

2.2创建POJO类

创建一个User实体类，只做简单的测试:

package com.xy.provider.pojo;

import java.io.Serializable;

public class User implements Serializable {
    private static final long serialVersionUID = -7341603933521593227L;
    private Long id;
    private String username;
    private String password;
    private Integer age;

    public static long getSerialVersionUID() {
        return serialVersionUID;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", age=" + age +
                '}';
    }
}

 

2.3创建接口及实现类

创建userService接口:

package com.xy.provider.service;

import com.xy.provider.pojo.User;

import java.util.List;

public interface UserService {
    public List<User> findAll();
    public void test();
}

UserServiceImpl实现类:

package com.xy.provider.service.impl;

import com.xy.provider.pojo.User;
import com.xy.provider.service.UserService;
import org.apache.dubbo.config.annotation.Service;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;

@Service    //这里要用dubbo的service，在项目一启动就注册到注册中心
@Component      //使用了Dubbo尽量不要用@Service
public class UserServiceImpl implements UserService {
    @Override
    public List<User> findAll() {
        System.out.println("查询所有");
        List<User> list = new ArrayList<User>();
        for (int i = 0; i < 10; i++) {
            User user = new User();
            user.setAge(10 + i);
            user.setId(Long.valueOf(i + 1));
            user.setPassword("123456");
            user.setUsername("username_" + i);
            list.add(user);
        }
        return list;
    }

    @Override
    public void test() {
        System.out.println("dubbo");
    }
}

 

2.4构造application.properties

#提供者名称
dubbo.application.name=provider
#注册中心地址
dubbo.registry.address=zookeeper://www.youngxy.top:2181
#哪些服务要注册
dubbo.scan.base-packages=com.xy.provider.service

 

三：consumer代码部分

3.1导入consumer.xml依赖

<?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>2.2.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.xy</groupId>
    <artifactId>consumer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>consumer</name>
    <description>Demo project for Spring Boot</description>

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

    <dependencies>
        <!-- https://mvnrepository.com/artifact/org.apache.dubbo/dubbo-spring-boot-starter -->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>2.7.3</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.github.sgroschupf/zkclient -->
        <dependency>
            <groupId>com.github.sgroschupf</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.1</version>
            <exclusions>
                <exclusion>
                    <artifactId>slf4j-log4j12</artifactId>
                    <groupId>org.slf4j</groupId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.curator/curator-framework -->
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>2.13.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-recipes</artifactId>
            <version>2.13.0</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.zookeeper/zookeeper -->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.13</version>
            <exclusions>
                <exclusion>
                    <artifactId>slf4j-log4j12</artifactId>
                    <groupId>org.slf4j</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <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>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>com.xy</groupId>
            <artifactId>provider</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>

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

</project>

 

3.2创建实现类

消费者要获取提供者的服务，定义消费者实现类:

package com.xy.consumer.service;

import com.xy.provider.pojo.User;
import com.xy.provider.service.UserService;
import com.xy.provider.service.impl.UserServiceImpl;
import org.apache.dubbo.config.annotation.Reference;
import org.springframework.stereotype.Service;

import java.util.List;

@Service        //这里是Spring的服务，表示放到容器中
public class ConsumerService {
    /*
    * 想要拿到UserService，要到注册中心去拿
    * */
    @Reference
    private UserService userService;    //引用，pom导入相关依赖
    public void consume(){
        System.out.println("test");
        List<User> users = userService.findAll();
        for (User user:users
             ) {
            System.out.println(user);
        }
       userService.test();
    }
}

 

3.3构造application.properties

#SpringBoot端口
server.port=8081
#消费者去注册中心获取服务需要暴露自己的名称
dubbo.application.name=consumer
#注册中心的地址
dubbo.registry.address=zookeeper://www.youngxy.top:2181

3.4创建测试类

package com.xy.consumer;


import com.xy.consumer.service.ConsumerService;
import com.xy.provider.pojo.User;
import com.xy.provider.service.UserService;
import org.apache.dubbo.config.annotation.Reference;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.List;

@SpringBootTest
class ConsumerApplicationTests {
    @Autowired
    private ConsumerService consumerService;
    @Test
    public void testConsume(){
        consumerService.consume();
        System.out.println("成功");
    }

}

 

四：打开dubbo-admin平台

首先在本地或者云服务器上面安装好dubbo软件，详情请参照:搭建分布式环境:Dubbo+Zookeeper

在浏览器输入:ip:8080/dubbo-admin-2.5.4-SNAPSHOT输入密码进入。

 

五：SpringBoot和Dubbo、Zookeeper版本不兼容问题的解决

5.1官方匹配的版本

请参考：SrpingBoot整合Zookeeper和Dubbo的版本匹配问题

 

5.2依赖冲突

请参考：依赖包冲突