Spring Cloud Zookeeper服务注册和发现

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/it_lihongmin/article/details/91355548

目录

1、从http://start.spring.io生成项目

2、zookeeper-client-provider

1)、在启动类中添加@EnableDiscoveryClient注解

2)、根目录下添加UserController

3)、使用Spring profiles方式启动三个服务节点

3、zookeeper-client-consumer

1)、启动类中添加@EnableFeignClients 和@EnableDiscoveryClient注解

2)、添加一个Controller和一个Service

3)、添加一个fallback类

---

    在之前有写Spring Cloud Eureka的集群服务（Spring Cloud Eureka Server集群和客户端调用），作为微服务的注册和发现中心。但是都知道Eureka Server已经是不会进行更新了，Spring Cloud还支持其他方式的注册和发现中心（Spring Cloud Zookeeper和Consul、etcd等形式），所以很有必要进行对比和选择。下面是一些大致的对比：

    Zookeeper集群的搭建可以参照Zookeeper的Windows集群搭建和Zookeeper的Centos集群搭建，在简历集群的基础上，我们开始搭建基于Zookeeper集群的微服务注册和调用，使用Feign 进行负载均衡调用，架构大致如下：

1、从http://start.spring.io生成项目

    在start.spring.io中添加Web、Actuator。生成项目后，在下面添加zookeeper-client-provider和zoopeeper-client-consumer两个项目，pom.xml中的dependencies都添加如下：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-zookeeper-all</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

2、zookeeper-client-provider

1)、在启动类中添加@EnableDiscoveryClient注解

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@EnableDiscoveryClient
@SpringBootApplication
public class ZookeeperClientProviderApplication {

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

}

2)、根目录下添加UserController

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserController {

    @Value("${server.port}")
    private int port;

    @GetMapping("user")
    public String getUserInfo(@RequestParam Long id) {
        User user = new User();
        user.setId(id);
        user.setName("userName-" + id);

        return user.toString() + "port:" + port;
    }

}

3)、使用Spring profiles方式启动三个服务节点

application-zookeeper-1.properties

server.port=8000
spring.application.name=zookeeper-user-provider
spring.cloud.zookeeper.connect-string=127.0.0.1:2181,127.0.0.1:2182,127.0.0.1:2183
spring.cloud.zookeeper.discovery.enabled=true
spring.cloud.zookeeper.discovery.register=true

application-zookeeper-2.properties

server.port=8001
spring.application.name=zookeeper-user-provider
spring.cloud.zookeeper.connect-string=127.0.0.1:2181,127.0.0.1:2182,127.0.0.1:2183
spring.cloud.zookeeper.discovery.enabled=true
spring.cloud.zookeeper.discovery.register=true

application-zookeeper-3.properties

server.port=8002
spring.application.name=zookeeper-user-provider
spring.cloud.zookeeper.connect-string=127.0.0.1:2181,127.0.0.1:2182,127.0.0.1:2183
spring.cloud.zookeeper.discovery.enabled=true
spring.cloud.zookeeper.discovery.register=true

3、zookeeper-client-consumer

1)、启动类中添加@EnableFeignClients 和@EnableDiscoveryClient注解

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@EnableFeignClients
@EnableDiscoveryClient
@SpringBootApplication
public class ZookeeperClientConsumerApplication {
    public static void main(String[] args) {
        SpringApplication.run(ZookeeperClientConsumerApplication.class, args);
    }
}

2)、添加一个Controller和一个Service

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;


@RestController
public class UserConsumerController {

    @Autowired
    private UserService userService;

    @GetMapping("getUser/{id}")
    public String getUserInfo(@PathVariable Long id) {

        return userService.getUserInfo(id);
    }

}

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

@FeignClient(value = "zookeeper-user-provider", fallback = FeignFallBack.class)
public interface UserService {

    /**
     *  定义Feign的接口
     *  使用{@link RequestParam} 一定要添加value值，否则不能正确的解析
     *
     * @param id 用户id
     * @return 用户信息
     */
    @GetMapping("user")
    String getUserInfo(@RequestParam(value = "id") Long id);

}

3)、添加一个fallback类

import org.springframework.stereotype.Component;

@Component
public class FeignFallBack implements UserService {

    @Override
    public String getUserInfo(Long id) {

        return null;
    }
}