Dubbo+Zookeeper实现分布式布局

加入Zookeeper

在服务器端使用docker 下载Zookeeper镜像

docker pull ovfftd6p.mirror.aliyuncs.com/library/zookeeper

下载完成后启动Zookeeper

docker run -name zk01 --restart always -d -p 2181:2181 {IMAGE ID}

使用 docker ps 查看是否启动成功
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Dubbo

官方文档：http://dubbo.apache.org/
github：
https://github.com/apache/dubbo

https://github.com/apache/dubbo-spring-boot-project

https://github.com/apache/dubbo-spring-boot-project/blob/0.2.x/README_CN.md

Dubbo是什么？

Dubbo是：
- 一款分布式服务框架
- 高性能和透明化的RPC远程服务调用方案
- SOA服务治理方案
- Dubbo每天为2千多个服务提供大于30亿次访问量支持，并被广泛应用于阿里巴巴集团的各成员站点以及别的公司的业务中。

编写provider代码（简单示例）

添加依赖

<!-- Dubbo Spring Boot Starter -->
   <dependency>
      <groupId>com.alibaba.boot</groupId>
      <artifactId>dubbo-spring-boot-starter</artifactId>
      <version>0.2.1.RELEASE</version>
   </dependency>
   <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>dubbo</artifactId>
      <version>2.6.5</version>
   </dependency>

<!--Zookeeper客户端Curator-->
   <dependency>
      <groupId>org.apache.curator</groupId>
      <artifactId>curator-recipes</artifactId>
      <version>2.12.0</version>
   </dependency>

代码

实体类

public class User implements Serializable {
    private int id;
    private String name;
    private int age;

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

    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

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

服务接口

public interface UserService {
    public User getUserById(int id);
}

服务实现类

@Service
@com.alibaba.dubbo.config.annotation.Service
public class UserServiceImpl implements UserService {
    @Override
    public User getUserById(int id) {
        User user = new User();
        user.setId(id);
        user.setAge(20);
        user.setName("zzm");
        return user;
    }
}

application.properties

server.port=8081

spring.application.name=dubbo-provider-user

dubbo.application.name=dubbo-provider-user

dubbo.scan.base-packages=com.etc.service

dubbo.registry.address=zookeeper://192.168.88.128:2181

springboot启动类

@SpringBootApplication
@EnableDubbo
public class DemoproviderApplication {

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

}

执行springboot启动类

编写consumer代码（简单示例）

加入依赖

<!-- Dubbo Spring Boot Starter -->
<dependency>
   <groupId>com.alibaba.boot</groupId>
   <artifactId>dubbo-spring-boot-starter</artifactId>
   <version>0.2.1.RELEASE</version>
</dependency>
<dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>dubbo</artifactId>
   <version>2.6.5</version>
</dependency>

<dependency>
   <groupId>org.apache.curator</groupId>
   <artifactId>curator-recipes</artifactId>
   <version>2.12.0</version>
</dependency>

代码

实体类和服务接口与provider一致
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ConUserService

public interface ConUserService {
    public User getUserById(int id);
}

ConUserServiceImpl

@Service
public class ConUserServiceImpl implements ConUserService {

    @Reference
    private UserService userService;


    @Override
    public User getUserById(int id) {

        return userService.getUserById(1);
    }
}

UserController

@RestController
public class UserController {

    @Autowired
    private ConUserService service;

    @GetMapping("user/{id}")
    public User getById(@PathVariable("id") int id){
        User userById = service.getUserById(id);
        return userById;
    }
}