gRpc服务注册到zookeeper实现

将Grpc服务注册到zookeeper中，具体zookeeper代码实现如下：服务注册在http://blog.csdn.net/July_whj/article/details/79423459中体现。
注册中心代码：

package cn.org.bjca.anysign.server.service.grpcanywrite.grpcserverinzk;

import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.ZooDefs;
import org.apache.zookeeper.ZooKeeper;
import org.slf4j.LoggerFactory;

import java.net.InetAddress;

/***************************************************************************
 * 
ZK注册中心
 *
 * @文件名称: GrpcAnyWritePDFSignFacadeZKServer.class
 * @包 路   径：  xxx
 * @版权所有： xxx (C) 2018
 * @类描述:
 * @版本: V2.0
 * @创建人： july_whj
 * @创建时间：2018/3/1 13:16
 ***************************************************************************/
public class GrpcAnyWritePDFSignFacadeZKServer {

    private org.slf4j.Logger logger = LoggerFactory.getLogger(getClass());// 日志

    private ZooKeeper zk = null;

    private  String zkHosts = null;
    private  int sessiontimeout = 0;
    public String parentznodepath = null;

    public GrpcAnyWritePDFSignFacadeZKServer(){

    }

    public GrpcAnyWritePDFSignFacadeZKServer(String zkHosts,int sessiontimeout,String parentznodepath){
        this.zkHosts = zkHosts;
        this.sessiontimeout = sessiontimeout;
        this.parentznodepath = parentznodepath;
    }

    public void getZkClient() throws Exception {
        zk = new ZooKeeper(zkHosts,
                sessiontimeout, null);
    }

    /**
     * 向zookeeper中的/下创建子节点
     * 默认本机IP
     * @param port
     * @throws InterruptedException
     */
    public void connectZK(String port) throws Exception {
        InetAddress address = InetAddress.getLocalHost();
        String data = address.getHostAddress()+":"+port;
        // 先创建出父节点
        if (zk.exists(parentznodepath, false) == null) {
            zk.create(parentznodepath, null,
                    ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        }
        // 连接zk创建znode
        zk.create(parentznodepath + "/",
                data.getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE,
                CreateMode.EPHEMERAL_SEQUENTIAL);
        logger.info("server "+data+" is online ......");
    }

    /**
     * 向zookeeper中的/下创建子节点
     * @param ip
     * @param port
     * @throws Exception
     */
    public void connectZK(String ip,String port) throws Exception {
        String data = ip+":"+port;
        // 先创建出父节点
        if (zk.exists(parentznodepath, false) == null) {
            zk.create(parentznodepath, null,
                    ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        }
        // 连接zk创建znode
        zk.create(parentznodepath + "/",
                data.getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE,
                CreateMode.EPHEMERAL_SEQUENTIAL);
        logger.info("server "+data+" is online ......");
    }

}

客户端实现：

package cn.org.bjca.anysign.server.service.grpcanywrite.grpcserverinzk;

import cn.org.bjca.anysign.server.service.grpcanywrite.GrpcAnyWritePDFSignFacadeClient;
import cn.org.bjca.seal.esspdf.platform.single.SysConfigSingle;
import cn.org.bjca.seal.esspdf.platform.utils.PropertiesUtil;
import org.apache.commons.lang3.StringUtils;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;

import java.util.ArrayList;
import java.util.List;

/***************************************************************************
 * 

 *
 * @文件名称: ${CLASS_NAME}
 * @包 路   径：  xxx
 * @版权所有：xxx (C) 2018
 * @类描述:
 * @版本: V2.0
 * @创建人： july_whj
 * @创建时间：2018/3/1 15:11
 ***************************************************************************/
public class ZKClient {

    private volatile List servers = null;
    private ZooKeeper zk = null;
    String parentZNodePath = null;
    // 获取zk连接
    private void getZkClient() throws Exception {


        try {
            PropertiesUtil propertiesUtil = SysConfigSingle.getInstance().getSysConfigProperties();
            String zkHosts = propertiesUtil.read("zkServerPort");
            String sessionTimeout = propertiesUtil.read("sessionTimeout");
            parentZNodePath = propertiesUtil.read("parentZNodePath");
            // 服务器在需求中并不需要做任何监听
            zk = new ZooKeeper(zkHosts,
                    Integer.parseInt(sessionTimeout), new Watcher() {

                public void process(WatchedEvent event) {

                    if (event.getType() == Event.EventType.None)
                        return;

                    try {
                        // 获取新的服务器列表,重新注册监听
                        updateServers();

                    } catch (Exception e) {

                        e.printStackTrace();
                    }

                }
            });
        } catch (Exception ex) {
        }



    }

    /**
     * 从zk中获取在线服务器信息
     */
    public void updateServers() throws Exception {

        // 从servers父节点下获取到所有子节点，并注册监听
        List children = zk.getChildren(parentZNodePath,
                true);

        ArrayList serverList = new ArrayList();

        for (String child : children) {

            byte[] data = zk.getData(parentZNodePath + "/"
                    + child, false, null);

            serverList.add(new String(data));

        }

        // 如果客户端是一个多线程程序，而且各个线程都会竞争访问servers列表，所以，在成员中用volatile修饰了一个servers变量
        // 而在更新服务器信息的这个方法中，是用一个临时List变量来进行更新
        servers = serverList;

        // 将更新之后的服务器列表信息打印在控制台观察一下
        for (String server : serverList) {

            System.out.println(server);

        }
        System.out.println("===================");

    }

    /**
     * 业务逻辑
     *
     * @throws InterruptedException
     */
    private void requestService() throws InterruptedException {


        String ipport = servers.get(0);//这里可以获取服务列表中任何值可做负载均衡
        if (StringUtils.isBlank(ipport)){
            System.out.println("zk获取服务失败");
        }else{
            String [] strs = ipport.split(":");
            GrpcAnyWritePDFSignFacadeClient client = new GrpcAnyWritePDFSignFacadeClient(strs[0], Integer.parseInt(strs[1]));//获取服务实现
            try {
                client.Test(null);//调用服务
            } finally {
                client.shutdown();
            }
        }

    }

    public static void main(String[] args) throws Exception {

        ZKClient client = new ZKClient();

        // 先构造一个zk的连接
        client.getZkClient();

        // 获取服务器列表
        client.updateServers();

        // 客户端进入业务流程，请求服务器的服务
        client.requestService();

    }

}