springcloud整合zookeeper注册中心

首先本地下载一个zookeeper，https://mirrors.tuna.tsinghua.edu.cn/apache/zookeeper/

下载3.4的，3.5 的解压的时候回出现文件已存在的错误，解压完会多出来一个文件夹，然后启动的时候找不到jar包报错。

下载完解压，进入conf文件夹，把zoo_sample.cfg文件改名为zoo.cfg。然后改一下里面的dataDir=D:\zookeeper-3.4.14\data

临时文件存放位置，一个路径。进入bin文件夹，双击zkServer.cmd启动zookeeper服务。

下载zookeeper图形化客户端 ZooInspectorhttps://issues.apache.org/jira/secure/attachment/12436620/ZooInspector.zip

解压后双击build文件夹中的那个jar包。点击左上角启动按钮连接zookeeper

新建一个maven项目，

pom文件

<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.3.RELEASE</version>
		<relativePath/>
	</parent>
	
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<!-- <version>Finchley.RC2</version> -->
				<version>Finchley.RELEASE</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>
	
	<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>
		<exclusions>
			<exclusion>
				<groupId>org.apache.zookeeper</groupId>
				<artifactId>zookeeper</artifactId>
			</exclusion>
		</exclusions>
	</dependency>
	<dependency>
		<groupId>org.apache.zookeeper</groupId>
		<artifactId>zookeeper</artifactId>
		<!-- 与服务器安装的Zookeeper版本相同 -->
		<version>3.4.10</version>
		<exclusions>
			<exclusion>
				<groupId>org.slf4j</groupId>
				<artifactId>slf4j-log4j12</artifactId>
			</exclusion>
		</exclusions>
	</dependency>
		
	</dependencies>
     
     <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>repository.springframework.maven.release</id>
            <name>Spring Framework Maven Release Repository</name>
            <url>http://maven.springframework.org/milestone/</url>
        </repository>
        <repository>
            <id>org.springframework</id>
            <url> http://maven.springframework.org/snapshot</url>
        </repository>
        <repository>
            <id>spring-milestone</id>
            <name>Spring Maven MILESTONE Repository</name>
            <url>http://repo.spring.io/libs-milestone</url>
        </repository>
        <repository>
            <id>spring-release</id>
            <name>Spring Maven RELEASE Repository</name>
            <url>http://repo.spring.io/libs-release</url>
        </repository>
    </repositories>
    
    <build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

启动类

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package com.vhukze.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
@EnableDiscoveryClient   //如果服务使用consoul、zookeeper，便可以使用此注解开启服务
public class ZkMemberController {

	@Value("${server.port}")
	private String serverPort;
	
	@RequestMapping("getMember")
	public String getMember() {
		return "订单服务调用会员服务接口，端口号为："+serverPort;
	}
	
	public static void main(String[] args) {
		SpringApplication.run(ZkMemberController.class, args);
	}
}

配置文件

###订单服务的端口号
server: 
  port: 8002
###服务别名---服务注册到注册中心的名称
spring: 
  application:
    name: zk-member
  cloud: 
    zookeeper:
    ###注册到的zookeeper地址
      connect-string: 127.0.0.1:2181

再新建一个maven项目

pom文件同上

启动类

package com.vhukze.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

/**
 * Hello world!
 *
 */
@SpringBootApplication
@EnableDiscoveryClient
@RestController
public class App 
{
	
	@Autowired
	private RestTemplate template;
	
	@RequestMapping("orderToMember")
	public String orderToMember() {
		String memberUrl = "http://zk-member/getMember";
		return template.getForObject(memberUrl, String.class);
	}
	
    public static void main( String[] args )
    {
        SpringApplication.run(App.class, args);
    }
    
    //默认rest方式开启负载均衡，如果以服务别名调用，必须注入此对象
    @Bean
    @LoadBalanced
    RestTemplate restTemplate() {
    	return new RestTemplate();
    }
}

配置文件

###订单服务的端口号
server: 
  port: 8004
###服务别名---服务注册到注册中心的名称
spring: 
  application:
    name: zk-order
  cloud: 
    zookeeper:
    ###注册到的zookeeper地址
      connect-string: 127.0.0.1:2181

启动第一个项目，然后改一个端口号再启动一遍，相当于一个集群，然后启动第二个项目。这时候

查看ZooInspector，便有三个服务了。

访问第二个项目的接口方法，刷新会变端口号，负载均衡的轮询机制