【Apache ZooKeeper】为ZNode设置watcher
众所周知，ZooKeeper中的ZNode是树形结构，现在我需要给/app1结点设置watcher，监听/app1下增减、删除和修改的结点，并将相应的事件使用log4j记录到日志文件中。ZNode的变化可以直接通过event.getType来获取。使用zk.exists(PATH, wc);来为PATH结点设置watcher，所有结点都可以使用wc做watcher。
代码如下：
<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.iflytek.cpcloud</groupId> <artifactId>zookeeper-test</artifactId> <version>0.1.0-SNAPSHOT</version> <dependencies> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>1.1.1</version> </dependency> <dependency> <groupId>commons-cli</groupId> <artifactId>commons-cli</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> </dependency><dependency> <groupId>org.apache.zookeeper</groupId> <artifactId>zookeeper</artifactId> <version>3.4.5</version> </dependency> </dependencies> <build> <plugins> <plugin><artifactId>maven-assembly-plugin</artifactId><version>2.2-beta-5</version><configuration> <descriptorRefs> <descriptorRef>jar-with-dependencies</descriptorRef> </descriptorRefs></configuration> </plugin> <plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>2.3.2</version><configuration> <source>1.6</source> <target>1.6</target> <encoding>UTF-8</encoding></configuration> </plugin> </plugins> </build></project>
