本篇文章主要记录SpringCloud使用Zookeeper作为服务注册发现中心,通过服务提供者和消费者为例,来真正掌握zk注册中心!
ide搭建聚合项目详解:https://blog.csdn.net/weixin_43888891/article/details/125267683
本篇文章采用了maven聚合工程,搭建父工程这些我就不记录了,完全是基于上一篇文章的项目进行开发的,具体参考上一篇文章!
Linux安装zookeeper:https://blog.csdn.net/weixin_43888891/article/details/125400887
一、搭建服务提供者
1. 创建cloud-provider-payment8004项目
2. 修改配置
修改pom:
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.gzl.cn</groupId>
<artifactId>cloud-api-common</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<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>
</dependency>
</dependencies>
添加 application.yml
server:
port: 8004
spring:
application:
name: cloud-provider-payment
cloud:
zookeeper:
connect-string: 127.0.0.1:2181
3. 添加主启动类
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@SpringBootApplication
@EnableDiscoveryClient
public class PayMentMain8004 {
public static void main(String[] args) {
SpringApplication.run(PayMentMain8004.class, args);
}
}
4. 添加controller
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.UUID;
@RestController
public class PaymentController {
@Value("${server.port}")
private String serverPort;
@RequestMapping(value = "/payment/zk")
private String paymentzk() {
return "springcloud with zookeeper: " + serverPort + "\t" + UUID.randomUUID().toString();
}
}
项目最终结构:
5.启动测试
http://localhost:8004/payment/zk
6.查看zk节点
这里是通过linux的zkCli.sh客户端进行查看的,客户端用法及常用命令讲解: https://blog.csdn.net/weixin_43888891/article/details/125400879
启动服务后,查看zk节点,会发现当服务启动完成后会在zk创建如下节点:
/services/cloud-provider-payment/894ac3f8-96dc-4c59-b2f2-98833aafc5ea
894ac3f8-96dc-4c59-b2f2-98833aafc5ea就是随机生成的一个uuid节点,也可以称为流水号。
根据get命令查看到在uuid的节点当中是存放的有数据的,数据格式化后如下:
这些数据就是服务的注册相关信息!
cloud-provider-payment就是我们在配置文件当中配置的服务名称
服务节点是临时节点还是持久节点?
答案是临时节点,当服务关闭的时候,会发现那个流水号节点立马就不存在了,紧接着在过几秒之后,cloud-provider-payment节点就也不存在了,再过几秒services节点就也不存在了。服务注册后创建了三个嵌套的节点全是临时节点。
Eureka追求的是CAP当中的AP,zookeeper追求的是CP,Eureka某种意义上来说提供了保护机制,作用就是尽可能的来避免因为网络原因而导致误删服务节点,尽管他的保护机制有很多bug,但是他的设计理念是这样的。而zookeeper可不管那么多,只要监听不到客户端的心跳,立马删除注册信息!
二、搭建服务消费者
1. 创建cloud-consumerzk-order80项目
2. 修改配置
修改pom:
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<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>
</dependency>
</dependencies>
添加 application.yml
server:
port: 80
spring:
application:
name: cloud-consumer-order
cloud:
zookeeper:
connect-string: 127.0.0.1:2181
3. 添加主启动类
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class OrderZk80 {
public static void main(String[] args) {
SpringApplication.run(OrderZk80.class, args);
}
}
4. 添加业务类
配置Bean:
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;
@Configuration
public class ApplicationContextBean {
@Bean
@LoadBalanced
public RestTemplate getRestTemplate() {
return new RestTemplate();
}
}
添加controller:
这里是通过 服务名称 调用的,假如有多个cloud-provider-payment服务,只要注册到注册中心,就是采用负载均衡的方式访问的!
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
@RestController
public class OrderZkController {
public static final String INVOKE_URL = "http://cloud-provider-payment";
@Autowired
private RestTemplate restTemplate;
@RequestMapping(value = "/consumer/payment/zk")
public String paymentInfo() {
String result = restTemplate.getForObject(INVOKE_URL + "/payment/zk", String.class);
System.out.println("消费者调用支付服务(zookeeper)--->result:" + result);
return result;
}
}
项目最终结构:
5.启动测试
http://localhost/consumer/payment/zk 查看节点:
git源码:https://gitee.com/gzl_com/spring-cloud.git
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