• 三个类:

    ServiceAProvider

    ServiceBProvider

    ServiceConsumer

    其中

    ServiceAProvider提供的服务名service-A,指向IP为192.168.58.130

    ServiceBProvider提供的服务名service-A,指向IP为192.168.58.131

    当有消费者请求时,随机地选取service-A列表的服务器提供服务

    ServiceConsumer 为消费者类

    依赖:

     

    01. <dependency>
    02. <groupId>org.apache.zookeeper</groupId>
    03. <artifactId>zookeeper</artifactId>
    04. <version>3.4.5-cdh5.1.0</version>
    05. </dependency>
    06. <dependency>
    07. <groupId>org.apache.helix</groupId>
    08. <artifactId>helix-core</artifactId>
    09. <version>0.6.4</version>
    10. </dependency>


     

    github源码下载地址:

    https://github.com/Bellonor/myhadoop2.x/tree/master/myhadoop2.x/src/main/java/com/jamesfen/zookeeper

    详见下面的代码:

    服务提供者ServiceAProvider类的源码为:

     

    01. package com.jamesfen.zookeeper;
    02. import java.net.InetAddress;
    03. import org.I0Itec.zkclient.ZkClient;
    04. public class ServiceAProvider {
    05.  
    06. private String serviceName = "service-A";
    07.  
    08. //向zookeeper注册服务
    09. public void init() throws Exception{
    10. String serverList = "192.168.58.11:2181";
    11. String PATH ="/configcenter";//根节点路径
    12. ZkClient zkClient = new ZkClient(serverList);
    13. boolean rootExists = zkClient.exists(PATH);
    14. if(!rootExists){
    15. zkClient.createPersistent(PATH);
    16. }
    17. //判断是否存在,不存在则创建服务节点
    18. boolean serviceExists = zkClient.exists(PATH + "/" + serviceName);
    19. if(!serviceExists){
    20. zkClient.createPersistent(PATH + "/" + serviceName);
    21. }
    22.  
    23. //註冊當前服務
    24. InetAddress addr =InetAddress.getLocalHost();
    25. //String ip= addr.getHostAddress().toString();
    26. String ip = "192.168.58.130";
    27.  
    28. //創建當前服務器節點
    29. zkClient.createEphemeral(PATH + "/" + serviceName + "/" + ip);
    30.  
    31. System.out.println("提供的服务节点名称为:"+PATH + "/" + serviceName + "/" + ip);
    32. }
    33. //提供服务
    34. public void provide(){
    35.  
    36. }
    37. public static void main(String[]args) throws Exception {
    38. ServiceAProvider service = new ServiceAProvider();
    39. service.init();
    40.  
    41. Thread.sleep(1000*60*60*24);
    42. }
    43.  
    44. }

    服务提供者ServiceBProvider类源码为

     

     

    01. package com.jamesfen.zookeeper;
    02. import java.net.InetAddress;
    03. import org.I0Itec.zkclient.ZkClient;
    04. public class ServiceBProvider {
    05. //服务名仍然为 A,这样是为了,一个服务名有两个台机器在服务,才能做负载均衡.
    06. private String serviceName = "service-A";
    07.  
    08. //向zookeeper注册服务
    09. public void init() throws Exception{
    10. String serverList = "192.168.58.11:2181";
    11. String PATH ="/configcenter";//根节点路径
    12. ZkClient zkClient = new ZkClient(serverList);
    13. boolean rootExists = zkClient.exists(PATH);
    14. if(!rootExists){
    15. zkClient.createPersistent(PATH);
    16. }
    17.  
    18. boolean serviceExists = zkClient.exists(PATH + "/" + serviceName);
    19. if(!serviceExists){
    20. zkClient.createPersistent(PATH + "/" + serviceName);//創建服務節點
    21. }
    22.  
    23. //註冊當前服務
    24. InetAddress addr =InetAddress.getLocalHost();
    25. //String ip= addr.getHostAddress().toString();
    26. String ip = "192.168.58.131";
    27.  
    28. //創建當前服務器節點
    29. zkClient.createEphemeral(PATH + "/" + serviceName + "/" + ip);
    30.  
    31. System.out.println("提供的服务节点名称为:"+PATH + "/" + serviceName + "/" + ip);
    32. }
    33. //提供服务
    34. public void provide(){
    35.  
    36. }
    37. public static void main(String[]args) throws Exception {
    38. ServiceBProvider service = new ServiceBProvider();
    39. service.init();
    40.  
    41. Thread.sleep(1000*60*60*24);
    42. }
    43.  
    44. }

    消费者类源码为:

     

     

    01. package com.jamesfen.zookeeper;
    02. import java.util.ArrayList;
    03. import java.util.List;
    04. import java.util.Random;
    05. import org.I0Itec.zkclient.IZkChildListener;
    06. import org.I0Itec.zkclient.ZkClient;
    07. public class ServiceConsumer {
    08.  
    09. private List<String> serverList = new ArrayList<String>();
    10.  
    11. private String serviceName ="service-A";
    12.  
    13. //初始化服务地址信息
    14. public void init(){    
    15. String zkServerList ="192.168.58.11:2181";
    16. String SERVICE_PATH="/configcenter/"+serviceName;//服务节点路径
    17. ZkClient zkClient = new ZkClient(zkServerList);
    18.  
    19. boolean serviceExists =zkClient.exists(SERVICE_PATH);
    20. if(serviceExists){
    21. serverList =zkClient.getChildren(SERVICE_PATH);
    22. }else{
    23. throw new RuntimeException("service not exist!");
    24. }
    25.  
    26. //注册事件监听
    27. zkClient.subscribeChildChanges(SERVICE_PATH,new IZkChildListener(){
    28. //@Override
    29. public void handleChildChange(String parentPath, List<String> currentChilds)throws Exception{
    30. serverList = currentChilds;
    31. }     
    32. });
    33. }
    34.  
    35.  
    36. //消费服务
    37. public void consume(){
    38. //通过负责均衡算法,得到一台服务器进行调用
    39. int index = getRandomNum(0,1);     
    40. System.out.println("调用" + serverList.get(index)+"提供的服务:" + serviceName);
    41. }
    42.  
    43. public int getRandomNum(int min,int max){ 
    44. Random rdm = new Random(); 
    45. return rdm.nextInt(max-min+1)+min;
    46.
    47.  
    48. public static void main(String[] args)throws Exception {
    49. ServiceConsumer consumer = new ServiceConsumer();  
    50.  
    51. consumer.init();
    52. consumer.consume();
    53.  
    54. Thread.sleep(1000*60*60*24);
    55. }
    56.  
    57. }

     

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