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1 描述
1.1 疑问
为什么要采用zookeeper作为注册中心？
那是因为eurake2.0开始，就闭源勒，当然，注册中心闭源，对我们开发来说，影响不大
zk是什么节点类型？临时或者持久？
临时节点。服务一关闭，过一段时间就会自己删除。
1.2准备
下载:https://issues.apache.org/jira/secure/attachment/12436620/ZooInspector.zip
方便查看zk的内容
2.zk代码
2.1zookeeper下载
2.2父项目依赖
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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.fqyd</groupId>
<artifactId>springcloud</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
</properties>
<modules>
<module>springcloud_eureka</module>
<module>springcloud_eureka_ha</module>
<module>springcloud_product</module>
<module>springcloud_product_member</module>
<module>springcloud_consumer</module>
<module>springcloud_zk_member</module>
</modules>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<!-- Spring Cloud 管理依赖 -->
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>2.3 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>
<parent>
<groupId>com.fqyd</groupId>
<artifactId>springcloud</artifactId>
<version>1.0-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
</parent>
<groupId>com.fqyd</groupId>
<artifactId>springcloud_zk_member</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springcloud_zk_member</name>
<description>Demo project for Spring Boot</description>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<!-- SpringBoot整合eureka客户端 -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
</dependency>
<!--zk工具包-->
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.13</version>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</exclusion>
<exclusion>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
</project>
注意这里导入的zk的版本，应该与zk服务的版本一样，我之前只导入了spring-cloud-starter-zookeeper-discovery依赖，实际上他对应的版本是4.0以上的，为了跟服务器的zk保持一致，我们应该明确版本
2.4 application.yml
###会员服务的端口号
server:
port: 8002
###服务别名----服务注册到注册中心名称
spring:
application:
name: zk-member
cloud:
zookeeper:
#注册到zk的地址
connect-string: 127.0.0.1:21812.5 controller
package com.fqyd.controller;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* Description：
* Author: wude
* Date: 2019/7/10 16:44
* Modified By:
*/
@RestController
public class MeberApiController {
@Value("${server.port}")
private String port;
@RequestMapping("getMember")
public String getMember(){
return "this is member!端口号为："+port;
}
}
2.6 启动类
package com.fqyd;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@SpringBootApplication
@EnableDiscoveryClient //如果服务注册是consul或者zk，可以使用该注解
public class SpringcloudZkMemberApplication {
public static void main(String[] args) {
SpringApplication.run(SpringcloudZkMemberApplication.class, args);
}
}
2.7效果
这里的zk-member就是我服务器指定的服务名
如果我强制关闭zk-member服务，会出现什么问题？
强制关闭zk-member服务后，该页面还是可以查看到该服务器的一些信息，需要等待一段时间左右，才会清理该服务的信息，这是因为zk，需要间隔一段时间，给zk-member包，也就是我们所说的心跳，这也是我博客开头所说的zk是临时节点，而不是永久节点，服务一关闭，他对应的信息也会消失。
{
"name": "zk-member",
"id": "506b477c-99ef-47b2-9ff8-cbf02e20bcfd",
"address": "DESKTOP-8S3CENH",
"port": 8002,
"sslPort": null,
"payload": {
"@class": "org.springframework.cloud.zookeeper.discovery.ZookeeperInstance",
"id": "application-1",
"name": "zk-member",
"metadata": {}
},
"registrationTimeUTC": 1563779355524,
"serviceType": "DYNAMIC",
"uriSpec": {
"parts": [{
"value": "scheme",
"variable": true
}, {
"value": "://",
"variable": false
}, {
"value": "address",
"variable": true
}, {
"value": ":",
"variable": false
}, {
"value": "port",
"variable": true
}]
}
}