SpringCloud整合Zookeeper注册中心

简介

        注册中心可以用Eureka等技术来实现，但是为了更好的扩展下知识层面，所以这次就使用Zookeeper作为注册中心，搭建一下以Zookeeper作为注册中心的微服务项目。

Zookeeper介绍

        Zookeeper是一个高性能，分布式的，开源分布式应用协调服务。它提供了简单原始的功能，分布式应用可以基于它实现更高级的服务，比如同步，配置管理，集群管理，名空间。它被设计为易于编程，使用文件系统目录树作为数据模型。 

首先在Zookeeper官网下载，地址如下图：

这次我们下载3.5.5的版本，因为我是以springboot2.0以上版本整合的，必须整好版本不然会报错，下载成功解压。

进入conf文件夹中如图：

复制一份conf文件夹下的zoo_sample. cfg文件并重命名为zoo.cfg修改dataDir=（你的zookeeper安装目录）

# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial 
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between 
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just 
# example sakes.
# 你的zookeeper安装目录路径
dataDir=F:\java\apache-zookeeper-3.5.5-bin\data
# the port at which the clients will connect
clientPort=2181
# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=60
#
# Be sure to read the maintenance section of the 
# administrator guide before turning on autopurge.
#
# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
#autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1

进入bin目录下，运行zkServer.cmd启动zookeeper服务。 

启动成功如下图：

在Eclipse中创建两个项目

pom.xml中的内容： 

	4.0.0
	
		org.springframework.boot
		spring-boot-starter-parent
		2.1.4.RELEASE
		 
	
	
	com.itmuch.cloud
	springcloud-zookeeper
	0.0.1-SNAPSHOT
	pom
	
	
		1.8
	
	
  
  	springcloud-zookeeper-order
  	springcloud-zookeeper-user
  
  
  
   
      org.springframework.cloud
      spring-cloud-starter-feign
      1.4.1.RELEASE 
   
  
  
  
  	
		
			org.springframework.boot
			spring-boot-dependencies
			2.1.4.RELEASE
			pom
			import
		
		
		
		    org.springframework.cloud
		    spring-cloud-dependencies
		    Greenwich.RELEASE
		    pom
		    import
		
	
  
  
  
	
		
			org.springframework.boot
			spring-boot-maven-plugin
		
	
  

 springcloud-zookeeper-user项目中的pom.xml内容：

  4.0.0
  
  
	 com.itmuch.cloud
	 springcloud-zookeeper
	 0.0.1-SNAPSHOT
  

  springcloud-zookeeper-user
  jar

  
    UTF-8
  

 
    
			org.springframework.boot
			spring-boot-starter-web
			
    
	  org.springframework.cloud
	  spring-cloud-starter-zookeeper-discovery
	

 

 springcloud-zookeeper-user项目中的application.yml内容：

server:
  port: 9001
spring:
  application: 
    name: zookeeper-user
  cloud: 
    zookeeper: 
      connect-string: localhost:2181
    discovery:
        enabled: true
        register: true

 springcloud-zookeeper-user项目中的启动类内容：

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

 springcloud-zookeeper-order项目中的pom.xml内容：

  4.0.0
  
  
	 com.itmuch.cloud
	 springcloud-zookeeper
	 0.0.1-SNAPSHOT
  

  springcloud-zookeeper-order
  jar

  
    UTF-8
  

 
    
			org.springframework.boot
			spring-boot-starter-web
			
    
	  org.springframework.cloud
	  spring-cloud-starter-zookeeper-discovery
	

 

 springcloud-zookeeper-order项目中的application.yml内容：

server:
  port: 9002
spring:
  application: 
    name: zookeeper-order
  cloud: 
    zookeeper: 
      connect-string: localhost:2181
    discovery:
        enabled: true
        register: true

 springcloud-zookeeper-order项目中的启动类内容：

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

  springcloud-zookeeper-user项目中的Controller:

@RestController
public class UserController {
	
	@GetMapping("/getUserList")
	public Map getUserList() {
		Map map = new HashMap();
		List userlist = new ArrayList();
		userlist.add("孙林");
		userlist.add("王伟");
		userlist.add("关天棋");
		userlist.add("于晓野");
		userlist.add("王大龙");
		map.put("userlist", userlist);
		return map;
	}
}

 springcloud-zookeeper-order项目中的Controller:

@RestController
public class OrderController {
	
	@Autowired
	private FeginInterfase feginInterfase;
	
	@GetMapping("/getUserList")
	public Map getUserList() {		
		Map map = feginInterfase.getUserList();
		return map;
	}
}

springcloud-zookeeper-order项目中的Fegin接口：

@FeignClient(name="zookeeper-user")
public interface FeginInterfase {

	@RequestMapping(value="/getUserList",method=RequestMethod.GET)
	public Map getUserList();
	
	
}

成功启动2个项目后，打开zookeeper管理工具可以查看到2个节点 

在浏览器中输入请求地址可看到输出结果，至此SpringCloud整合Zookeeper注册中心以成功搭建完成。