SpringCloud&alibaba學習筆記系列
該筆記僅作為個人學習使用。
第三章zookeeper的服務發現與注冊
官網:https://zookeeper.apache.org/
使用zookeeper代替eureka
3.1注冊中心zookeeper
3.1.1概述
ZooKeeper是Hadoop的正式子項目,它是一個針對大型分布式系統的可靠協調系統,提供的功能包括:配置維護、名字服務、分布式同步、組服務等。也可以實作注冊中心功能;
3.1.2下載下傳安裝
下載下傳安裝這裡就不贅述,詳見我我的部落格《離線安裝zookeeper》。
3.2服務提供者
下面我們實際示範通過zookeeper作為服務注冊中心和如何注冊到zookeeper。
1.建立cloud-provider-payment8004
2.pom檔案
直接從8001拷貝過來依賴
<?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>springcloud2020</artifactId>
<groupId>com.jzt</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-provider-payment8004</artifactId>
<dependencies>
<!--zookeeper用戶端-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
<!--解決zookeeper版本沖突問題-->
<exclusions>
<exclusion>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.9</version>
</dependency>
<dependency>
<groupId>com.jzt</groupId>
<artifactId>cloud-api-common</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</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>
<version>1.18.14</version>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
</project>
3.yml配置
server:
port: 8004
spring:
application:
name: cloud-provider-payment
cloud:
zookeeper:
connect-string: 192.168.31.111:2181
4.主啟動類
package com.jzt;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
//import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
/**
* 功能描述:
*
* @Author: sj
* @Date: 2020/10/25 11:26
*/
@SpringBootApplication
//@EnableEurekaClient
@EnableDiscoveryClient //使用consul或者zookeeper作為注冊中心時注冊服務
public class PaymentService8004 {
public static void main(String[] args) {
SpringApplication.run(PaymentService8004.class, args);
}
}
5.controller
package com.jzt.controller;
import lombok.extern.slf4j.Slf4j;
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;
/**
* 功能描述:
*
* @Author: sj
* @Date: 2020/10/25 15:46
*/
@RestController
@Slf4j
public class PaymentController {
@Value("${server.port}")
private String port;
@RequestMapping(value = "/payment/zk")
public String paymentzk(){
return "zookeeper :"+port+"\t"+ UUID.randomUUID().toString();
}
}
6.解決jar包沖突問題
啟動後的問題:
這是因為springcloud的zookeeper元件自帶zookeeper包,這與自己引入的zookeeper的版本不一緻,最終導緻出錯。
可以使用 标簽來去除springcloud自身依賴的zookeeper包:
<!--zookeeper用戶端-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zookeeper</artifactId>
<exclusions>
<exclusion>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.9</version>
</dependency>
7.測試
http://localhost:8004/payment/zk
進入zookeeper,檢視節點資訊:
在zookeeper伺服器中也能夠檢視到我們建立的服務了!說明我們的cloud-payment-service8004已經成功注冊到zookeeper注冊中心。
服務節點是臨時節點還是持久節點
zookeeper的節點時臨時性的。當zookeeper接收不到注冊服務的心跳時會立刻删除該服務節點。zookeeper在CAP理論中屬性CP模型
3.3服務消費者
下面我們建構一個服務消費者,将它也注冊到zookeeper中。
1.建立cloud-consumerzk-order80
2.配置POM檔案
<?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>springcloud2020</artifactId>
<groupId>com.jzt</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-consumerzk-order80</artifactId>
<dependencies>
<!--zookeeper用戶端-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
<!--解決zookeeper版本沖突問題-->
<exclusions>
<exclusion>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.9</version>
</dependency>
<dependency>
<groupId>com.jzt</groupId>
<artifactId>cloud-api-common</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</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>
<version>1.18.14</version>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
</project>
3.配置yml檔案
server:
port: 80
spring:
application:
name: cloud-comsumerzk-order
cloud:
zookeeper:
connect-string: 192.168.31.111:2181
4.主啟動類
package com.jzt;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
/**
* 功能描述:
*
* @Author: sj
* @Date: 2020/11/10 7:21
*/
@SpringBootApplication
@EnableDiscoveryClient
public class OrderZkOrder80 {
public static void main(String[] args) {
SpringApplication.run(OrderZkOrder80.class, args);
}
}
5.業務類
配置類
package com.jzt.config;
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;
/**
* 功能描述:
*
* @Author: sj
* @Date: 2020/11/10 7:24
*/
@Configuration
public class ApplicationContextConfig {
@Bean
@LoadBalanced //開啟負載均衡功能
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
}
controller
package com.jzt.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import javax.annotation.Resource;
/**
* 功能描述:
*
* @Author: sj
* @Date: 2020/11/10 7:29
*/
@RestController
public class OrderZKController {
public static final String INVOKE_URL = "http://cloud-provider-payment";
@Resource
private RestTemplate restTemplate;
@GetMapping(value = "consumer/payment/zk")
public String paymentInfo(){
String result = restTemplate.getForObject(INVOKE_URL+"/payment/zk", String.class);
return result;
}
}
6.測試
檢視zookeeper節點資訊,發現cloud-consumer-order服務已經注冊到zk中。
服務調用也能正常執行。