????ZooKeeperConfig.java
???????ò??????ZooKeeper?????
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
????????ZooKeeper?????????
????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
???????ü?????????????????????ZooKeeperPropertyPlaceholderConfigurer?????????д??processProperties??????????????????????????á?
????<?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
???????????????????????????ZooKeeper????????????????????????????е??????????????ZooKeeper?С?
????zoo.paths=/properties
????????ZooKeeper????
???????ZooKeeper?????? /cfg/properties ????????????

????????????????????????? /cfg/properties ?????????????jdbc.driver=org.postgresql.Driver
????????Startup.java

????OK ???zoo.paths?????application.properties????е??jdbc.driver?????ZooKeeper???????е??
??????????????????jar??
<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>