由于zookeeper的client只有zookeeper一个对象，使用也比较简单，所以就不许要文字说明了，在代码中注释下就ok 了。
1、测试用的main方法
package ClientExample; public class TestMain { public static void main(String[] args) { /* * 测试流程 * 1、创建sever1的连接client1，并且创建一个永久性的/test节点 * 2、创建一个针对server1的临时节点 * 3、创建server2的连接client21，并创建一个针对server2的临时节点 * 4、创建server3的连接client3，并创建一个针对server3的临时节点 * 5、分别查看client1、client2、client3的三个节点的字节点数量，确定是否同步成功 * 6、修改client1的临时节点内容，然后在在client2和client3中查看 * 7、kill掉client3的线程，然后检查是watcher是否有通知给client1和client2 */ Thread t1= new ClientThread("127.0.0.1:2181","server1",false); Thread t2= new ClientThread("127.0.0.1:2182","server2",false); Thread t3= new ClientThread("127.0.0.1:2183","server3",false); Thread t4= new ClientThread("127.0.0.1:2181","server4",false); t1.start(); t2.start(); t3.start(); t4.start(); ControlThread c = new ControlThread(t1, t2, t3, t4); c.start(); int i=0; while(true) { i++; i--; } /* * 测试控制台输出： * connectIP:server4,path:null,state:SyncConnected,type:None * connectIP:server3,path:/test,state:SyncConnected,type:NodeChildrenChanged * connectIP:server4,path:/test/server4,state:SyncConnected,type:NodeCreated * 。。。。。。。。。。。 * * connectIP:server2,path:null,state:Disconnected,type:None server2exception,KeeperErrorCode = ConnectionLoss for /test connectIP:newServer1,path:null,state:SyncConnected,type:None connectIP:server1,path:/test,state:SyncConnected,type:NodeChildrenChanged connectIP:server4,path:/test/server2,state:SyncConnected,type:NodeDeleted connectIP:server4,path:/test,state:SyncConnected,type:NodeChildrenChanged connectIP:newServer1,path:/test,state:SyncConnected,type:NodeChildrenChanged connectIP:server3,path:/test/server2,state:SyncConnected,type:NodeDeleted connectIP:server3,path:/test,state:SyncConnected,type:NodeChildrenChanged */ } }
2、zookeeper封装的接口：package ClientExample; import java.io.IOException; import java.util.List; import org.apache.zookeeper.KeeperException; /** * zookeeper的操作封装接口，实现了常用的操作 * 创建、销毁、写入、修改、查询等。 * @author ransom * */ public interface ServerOperation { void init(String address,String serverName) throws IOException; void destroy() throws InterruptedException; List<String> getChilds(String path) throws KeeperException, InterruptedException; String getData(String path) throws KeeperException, InterruptedException; void changeData(String path, String data) throws KeeperException, InterruptedException; void delData(String path) throws KeeperException, InterruptedException; void apendTempNode(String path, String data) throws KeeperException, InterruptedException; void apendPresistentNode(String path, String data) throws KeeperException, InterruptedException; void delNode(String path) throws KeeperException, InterruptedException; boolean exist(String path) throws KeeperException, InterruptedException; }
3、接口的实现：package ClientExample;import java.io.IOException;
import java.util.List;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.ZooDefs.Ids;
public class ServerConnector implements ServerOperation {
// 创建一个Zookeeper实例，第一个参数为目标服务器地址和端口，第二个参数为Session超时时间，第三个为节点变化时的回调方法
private ZooKeeper zk = null;
public void init(String address,String serverName) throws IOException {
zk = new ZooKeeper(address, 500000,
new MultiWatcher(serverName));
}
@Override
public void destroy() throws InterruptedException {
// TODO Auto-generated method stub
if (zk != null) {
zk.close();
}
}
@Override
public List<String> getChilds(String path) throws KeeperException, InterruptedException {
// TODO Auto-generated method stub
if (zk != null) {
return zk.getChildren(path, true);
}
return null;
}
@Override
public String getData(String path) throws KeeperException, InterruptedException {
// TODO Auto-generated method stub
if (zk != null) {
// 取得/root/childone节点下的数据,返回byte[]
byte[] b = zk.getData(path, true, null);
return new String(b);
}
return null;
}
@Override
public void changeData(String path,String data) throws KeeperException, InterruptedException {
// TODO Auto-generated method stub
if (zk != null) {
// 修改节点/root/childone下的数据，第三个参数为版本，如果是-1，那会无视被修改的数据版本，直接改掉
zk.setData(path, data.getBytes(),-1);
}
}
@Override
public void delData(String path) throws InterruptedException, KeeperException {
// TODO Auto-generated method stub
if (zk != null) {
// 删除/root/childone这个节点，第二个参数为版本，－1的话直接删除，无视版本
zk.delete(path, -1);
}
}
@Override
public void delNode(String path) throws InterruptedException, KeeperException {
// TODO Auto-generated method stub
if (zk != null) {
zk.delete(path, -1);
}
}
@Override
public boolean exist(String path) throws KeeperException,
InterruptedException {
// TODO Auto-generated method stub
if (zk != null) {
return zk.exists(path, true)!=null;
}
return false;
}
@Override
public void apendTempNode(String path, String data) throws KeeperException,
InterruptedException {
// TODO Auto-generated method stub
// TODO Auto-generated method stub
if (zk != null)
{
// 创建一个节点root，数据是mydata,不进行ACL权限控制，节点为永久性的(即客户端shutdown了也不会消失)
/*
* 创建一个给定的目录节点 path, 并给它设置数据，
* CreateMode 标识有四种形式的目录节点,分别是
* PERSISTENT：持久化目录节点，这个目录节点存储的数据不会丢失；
* PERSISTENT_SEQUENTIAL：顺序自动编号的目录节点，这种目录节点会根据当前已近存在的节点数自动加 1，然后返回给客户端已经成功创建的目录节点名；
* EPHEMERAL：临时目录节点，一旦创建这个节点的客户端与服务器端口也就是 session 超时，这种节点会被自动删除；
* EPHEMERAL_SEQUENTIAL：临时自动编号节点
*/
zk.create(path, data.getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
}
}
@Override
public void apendPresistentNode(String path, String data)
throws KeeperException, InterruptedException {
// TODO Auto-generated method stub
if (zk != null)
{
// 创建一个节点root，数据是mydata,不进行ACL权限控制，节点为永久性的(即客户端shutdown了也不会消失)
/*
* 创建一个给定的目录节点 path, 并给它设置数据，
* CreateMode 标识有四种形式的目录节点,分别是
* PERSISTENT：持久化目录节点，这个目录节点存储的数据不会丢失；
* PERSISTENT_SEQUENTIAL：顺序自动编号的目录节点，这种目录节点会根据当前已近存在的节点数自动加 1，然后返回给客户端已经成功创建的目录节点名；
* EPHEMERAL：临时目录节点，一旦创建这个节点的客户端与服务器端口也就是 session 超时，这种节点会被自动删除；
* EPHEMERAL_SEQUENTIAL：临时自动编号节点
*/
zk.create(path, data.getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
}
}
} 4、一个控制的线程，主要用来强制kill掉连接的线程package ClientExample; public class ControlThread extends Thread{ public ControlThread(Thread t1,Thread t2,Thread t3,Thread t4) { list[0]=t1; list[1]=t2; list[2]=t4; list[3]=t4; } private Thread[] list = new Thread[4]; private int num=0; public void run() { while(true) { if(num==7) { list[2].stop(); System.out.println("kill server3"); } if(num==15) { list[3].stop(); System.out.println("kill server4"); } try { sleep(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } }
5、watcher 的实现：package ClientExample; import org.apache.zookeeper.WatchedEvent; import org.apache.zookeeper.Watcher; import org.apache.zookeeper.Watcher.Event.EventType; import org.apache.zookeeper.Watcher.Event.KeeperState; /** * 提供给多个client使用的watcher * @author ransom * */ public class MultiWatcher implements Watcher{ public MultiWatcher(String address) { connectAddress=address; } private String connectAddress=null; @Override public void process(WatchedEvent event) { // TODO Auto-generated method stub String outputStr=""; if(connectAddress!=null){ outputStr+="connectIP:"+connectAddress; } outputStr+=",path:"+event.getPath(); outputStr+=",state:"+event.getState(); outputStr+=",type:"+event.getType(); System.out.println(outputStr); } }
6、client 运行 的Threadpackage ClientExample; import java.io.IOException; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; import java.util.List; import org.apache.zookeeper.KeeperException; public class ClientThread extends Thread{ public ClientThread(String address,String serverName,boolean islog) { this.address=address; this.serverName=serverName; try { otherOperation(); } catch (KeeperException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } this.islog=islog; } private boolean islog=true; private final String rootPath = "/test"; private String address; private String serverName; private ServerOperation operationCient = null; public void run() { if(operationCient==null) { System.out.println("operationCient=null"); return; } while(true){ try { if(islog){ System.out.println(serverName+",loopTime:"+getNowTime()); } observerChildData(rootPath); } catch (KeeperException e) { // TODO Auto-generated catch block System.out.println(serverName+"exception,"+e.getLocalizedMessage()); try { operationCient= new ServerConnector(); operationCient.init("127.0.0.1:2181","newServer1"); } catch (IOException e1) { // TODO Auto-generated catch block System.out.println(serverName+" reconnect exception,"+e.getLocalizedMessage()); } } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { sleep(2000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } /* * 测试流程 * 1、创建sever1的连接client1，并且创建一个永久性的/test节点 * 2、创建一个针对server1的临时节点 * 3、创建server2的连接client21，并创建一个针对server2的临时节点 * 4、创建server3的连接client3，并创建一个针对server3的临时节点 * 5、分别查看client1、client2、client3的三个节点的字节点数量，确定是否同步成功 * 6、修改client1的临时节点内容，然后在在client2和client3中查看 * 7、kill掉client3的线程，然后检查是watcher是否有通知给client1和client2 */ private void otherOperation() throws KeeperException, InterruptedException { operationCient= new ServerConnector(); try { operationCient.init(address,serverName); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } if(operationCient==null) { System.out.println("operationCient=null"); return; } if(!operationCient.exist(rootPath)) { operationCient.apendPresistentNode(rootPath, "this node is creat by " + serverName); } //添加临时节点 if(!operationCient.exist(rootPath+"/"+serverName)) { operationCient.apendTempNode(rootPath+"/"+serverName, "this node is creat by " + serverName); } observerChildData("/test"); //修改临时节点内容 operationCient.changeData(rootPath+"/"+serverName, "this node is changed by " + serverName); //临时节点内容 List<String> childs=operationCient.getChilds(rootPath); for(String str : childs) { System.out.println("observered by "+ serverName +": child node is :"+ str); } } //查看临时节点的同步状态 public void observerChildData(String path) throws KeeperException, InterruptedException { if(operationCient==null) { System.out.println("operationCient=null"); return; } List<String> childs=operationCient.getChilds(rootPath); if(islog){ System.out.println("observered by "+ serverName +": childs len is :"+ childs.size()); } for(String str : childs) { if(islog){ System.out.println("observered by "+ serverName +": child node is :"+ str+",data is :"+operationCient.getData(rootPath+"/"+str)); } } } public String getNowTime() { DateFormat format1 = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); return format1.format(new Date()); } }
