springboot+dubbo+zk

注意

关于Curator连接Zookeeper对应版本

Versions
The are currently two released versions of Curator, 2.x.x and 3.x.x:
 
Curator 2.x.x - compatible with both ZooKeeper 3.4.x and ZooKeeper 3.5.x
Curator 3.x.x - compatible only with ZooKeeper 3.5.x and includes support for new features such as dynamic reconfiguration, etc.

正文

目录结构

dubbo

pom.xml

<?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.gohb</groupId>
    <artifactId>dubbo</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>dubbo_api</module>
        <module>dubbo_provider</module>
        <module>dubbo_consumer</module>
    </modules>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.4.RELEASE</version>
    </parent>


    <dependencies>
        <!--springboot 启动器-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <!--lombok依赖-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <!--dubbo springboot启动器-->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>2.7.8</version>
        </dependency>
        <!--curator依赖-->
        <!--Curator提供了一套Java类库， 可以更容易的使用ZooKeeper。 -->
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-recipes</artifactId>
            <version>2.12.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>2.12.0</version>
        </dependency>

    </dependencies>


</project>

dubbo_api

pom.xml

<?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>dubbo</artifactId>
        <groupId>com.gohb</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>dubbo_api</artifactId>


</project>

dubbo_api目录结构

User

package com.gohb.pojo;

public class User {
    

    private Long id;
    private String name;
    private String password;

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

    public Long getId() {
    
        return id;
    }

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

    public String getName() {
    
        return name;
    }

    public void setName(String name) {
    
        this.name = name;
    }

    public String getPassword() {
    
        return password;
    }

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

UserService

package com.gohb.service;

import com.gohb.pojo.User;

/**
 * 用户服务接口
 */
public interface UserService {
    
    void register(User user);
    User getUserById(Long id);
}

dubbo_provider

dubbo_provider目录结构

pom.xml

<?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>dubbo</artifactId>
        <groupId>com.gohb</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>dubbo_provider</artifactId>

    <dependencies>
        <dependency>
            <groupId>com.gohb</groupId>
            <artifactId>dubbo_api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>

</project>

application.yml

dubbo:
  registry:
    address: zookeeper://192.168.91.145:2181 # 提供注册中心的访问地址。
  application:
    name: gohb-dubbo-provider # 配置本dubbo的应用名称，名称组成是：字母，数字，'-'，字母开头
#  protocol: # 协议，协议自定义配置的时候，所有的默认值失效。
#    name: dubbo # 协议名
#    port: 20880 # 端口，默认20880

UserMapper

package com.gohb.mapper;

import com.gohb.pojo.User;

/**
 * 模拟数据库访问
 */
public interface UserMapper {
    
    void insert(User user);
    User selectById(Long id);
}

UserMapperImpl

package com.gohb.mapper.impl;

import com.gohb.mapper.UserMapper;
import com.gohb.pojo.User;
import org.springframework.stereotype.Repository;

@Repository
public class UserMapperImpl implements UserMapper {
    
    @Override
    public void insert(User user) {
    
        System.out.println("数据库访问：新增用户 - " + user);
    }

    @Override
    public User selectById(Long id) {
    
        User user = new User();
        user.setId(id);
        user.setName("name" + id);
        user.setPassword("password" + id);
        System.out.println("数据库访问：主键查询用户 - " + user);
        return user;
    }
}

UserServiceImpl

package com.gohb.service.impl;

import com.gohb.mapper.UserMapper;
import com.gohb.pojo.User;
import com.gohb.service.UserService;
import org.apache.dubbo.config.annotation.DubboService;
import org.springframework.beans.factory.annotation.Autowired;

@DubboService(loadbalance = "roundrobin")
public class UserServiceImpl implements UserService {
    

    @Autowired
    private UserMapper userMapper;

    @Override
    public void register(User user) {
    
        System.out.println("UserService 实现类中：注册用户");
        userMapper.insert(user);
    }

    @Override
    public User getUserById(Long id) {
    
        System.out.println("UserService 实现类中：根据id查询用户");
        return userMapper.selectById(id);
    }
}

DbProviderApplication

package com.gohb;

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

/**
 * 启动的每个Dubbo应用，一定会在注册中心中注册信息。
 *  * 服务提供者注册的是/dubbo/xxx/providers
 *  * 服务消费者注册的是/dubbo/xxx/consumers
 *  *
 *  * Dubbo启动器（dubbo-spring-boot-starter）默认不生效。
 *  * 必须通过@EnableDubbo让启动器生效。
 *  *
 *  * 在2.7.2- 版本中，部分配置默认不加载，需要使用@EnableDubboConfig让
 *  * 全部配置生效。
 *  *
 *  *
 *  * 负载均衡策略：
 *  *  设置负载均衡策略，可以在@DubboService或者@DubboReference注解上
 *  *  加属性loadbalance进行配置。
 *  *  消费者默认是不考虑负载均衡策略的，是使用提供者定义的负载均衡策略。
 *  *  如果消费者配置了负载均衡策略，则忽略提供者配置的负载均衡策略。
 */
@SpringBootApplication
@EnableDubbo
public class DbProviderApplication {
    
    public static void main(String[] args) {
    
        SpringApplication.run(DbProviderApplication.class,args);
    }
}

dubbo_consumer

dubbo_consumer目录结构

pom.xml

<?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>dubbo</artifactId>
        <groupId>com.gohb</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>dubbo_consumer</artifactId>

    <dependencies>
        <dependency>
            <groupId>com.gohb</groupId>
            <artifactId>dubbo_api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>


</project>

application.yml

dubbo:
  registry:
    address: zookeeper://192.168.91.145:2181
  application:
    name: gohb-dubbo-provider

UserController

package com.gohb.controller;

import com.gohb.pojo.User;
import com.gohb.service.LocalUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserController {
    

    @Autowired
    private LocalUserService localUserService;

    @RequestMapping("findUser")
    public User findUser(Long id){
    
        return localUserService.getById(id);
    }

    @RequestMapping("registerUser")
    public String register(User user){
    
        localUserService.register(user);
        return "注册用户成功";
    }

    @RequestMapping("hello")
    public String hello(){
    
        return "hello";
    }


}

LocalUserService

package com.gohb.service;

import com.gohb.pojo.User;

/**
 * consumer子Module的本地Service
 */
public interface LocalUserService {
    
    void register(User user);
    User getById(Long id);
}

LocalUserServiceImpl

package com.gohb.service.impl;

import com.gohb.pojo.User;
import com.gohb.service.LocalUserService;
import com.gohb.service.UserService;
import org.apache.dubbo.config.annotation.DubboReference;
import org.springframework.stereotype.Service;


@Service
public class LocalUserServiceImpl implements LocalUserService {
    

    /**
     * 远程服务的接口。通过注解@DubboReference实现动态代理创建
     * 规则：
     * 1、 通知Dubbo框架，根据配置找注册中心，发现服务的地址。
     *    拿接口名称作为zookeeper中节点的命名规则，获取地址。
     * 2、 通知Spring，根据Dubbo框架的特性，创建接口的动态代理对象，并维护
     *    在Spring容器中。
     * 3、 类似@Autowired，把代理对象注入到当前的变量中。
     */
    @DubboReference
    private UserService userService;

    @Override
    public void register(User user) {
    
        System.out.println("准备调用远程服务，服务对象类型是：" + userService.getClass().getName());
        System.out.println("注册的用户是： " + user);
        userService.register(user);
    }

    @Override
    public User getById(Long id) {
    
        System.out.println("根据主键查询用户，主键是： " + id);
        return userService.getUserById(id);
    }
}

DbConsumerApplication

package com.gohb;

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

@SpringBootApplication(scanBasePackages = ("com.gohb.*"))
@EnableDubbo
public class DbConsumerApplication {
    
    public static void main(String[] args) {
    
        SpringApplication.run(DbConsumerApplication.class,args);
    }
}