ZooKeeperConfig.java
　　配置操作接口ZooKeeper的实现
package org.bigmouth.common.zookeeper.config;
import org.apache.curator.framework.CuratorFramework;
import org.apache.zookeeper.data.Stat;
public class ZooKeeperConfig implements Config {
@Override
public byte[] getConfig(String path) throws Exception {
CuratorFramework client = ZooKeeperFactory.get();
if (!exists(client， path)) {
throw new RuntimeException("Path " + path + " does not exists.");
}
return client.getData().forPath(path);
}
private boolean exists(CuratorFramework client， String path) throws Exception {
Stat stat = client.checkExists().forPath(path);
return !(stat == null);
}
}
　　ZooKeeperFactory.java
　　管理ZooKeeper客户端连接
　　package org.bigmouth.common.zookeeper.config;
　　import org.apache.curator.RetryPolicy;
　　import org.apache.curator.framework.CuratorFramework;
　　import org.apache.curator.framework.CuratorFrameworkFactory;
　　import org.apache.curator.retry.ExponentialBackoffRetry;
　　public class ZooKeeperFactory {
　　public static final String CONNECT_STRING = "172.16.3.42:2181，172.16.3.65:2181，172.16.3.24:2181";
　　public static final int MAX_RETRIES = 3;
　　public static final int BASE_SLEEP_TIMEMS = 3000;
　　public static final String NAME_SPACE = "cfg";
　　public static CuratorFramework get() {
　　RetryPolicy retryPolicy = new ExponentialBackoffRetry(BASE_SLEEP_TIMEMS， MAX_RETRIES);
　　CuratorFramework client = CuratorFrameworkFactory.builder()
　　.connectString(CONNECT_STRING)
　　.retryPolicy(retryPolicy)
　　.namespace(NAME_SPACE)
　　.build();
　　client.start();
　　return client;
　　}
　　}
　　applicationContext.xml
　　配置加载器使用我们自己创建的ZooKeeperPropertyPlaceholderConfigurer，因为它重写了processProperties方法。这个方法里会去读取远程配置。
　　<?xml version="1.0" encoding="UTF-8"?>
　　<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
　　<beans>
　　<bean class="org.bigmouth.common.zookeeper.config.spring.ZooKeeperPropertyPlaceholderConfigurer">
　　<property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" />
　　<property name="ignoreResourceNotFound" value="true" />
　　<property name="locations">
　　<list>
　　<value>classpath:application.properties</value>
　　</list>
　　</property>
　　</bean>
　　</beans>
　　application.properties
　　项目配置文件，里面除了配置ZooKeeper服务器地址和读取的节点以外，其他所有的配置都应该保存在ZooKeeper中。
　　zoo.paths=/properties
　　设置ZooKeeper数据
　　登录ZooKeeper中为节点 /cfg/properties 添加一条配置项：

　　如图所示：我创建了一个节点 /cfg/properties 并设置内容为：jdbc.driver=org.postgresql.Driver
　　运行Startup.java

　　OK 了，zoo.paths是本地application.properties文件中的，jdbc.driver是远程ZooKeeper服务器中的。
　　项目中需要依赖的jar包
<dependency>
<groupId>commons-lang</groupId>
<artifactId>commons-lang</artifactId>
<version>2.4</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>3.0.3.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>3.0.3.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>3.0.3.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>3.0.3.RELEASE</version>
</dependency>
<!-- ZooKeeper -->
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.6</version>
</dependency>
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-framework</artifactId>
<version>2.4.2</version>
</dependency>
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-recipes</artifactId>
<version>2.4.2</version>
</dependency>