Use Apache common IO to monitor file changes — to

<span style="color: #0000ff;">import<span style="color: #000000;"> org.apache.commons.io.filefilter.FileFilterUtils;

<span style="color: #0000ff;">import<span style="color: #000000;"> org.apache.commons.io.monitor.FileAlterationListener;

<span style="color: #0000ff;">import<span style="color: #000000;"> org.apache.commons.io.monitor.FileAlterationMonitor;

<span style="color: #0000ff;">import<span style="color: #000000;"> org.apache.commons.io.monitor.FileAlterationObserver;

<span style="color: #0000ff;">import<span style="color: #000000;"> java.io.File;

<span style="color: #0000ff;">import<span style="color: #000000;"> java.util.concurrent.TimeUnit;
<span style="color: #008000;">/**<span style="color: #008000;">

 
 
 


  
  
  

Created with IntelliJ IDEA.


  
  
  

User: superman


  
  
  

Date: 14-1-5


  
  
  

Time: 上午11:43


  
  
  

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<span style="color: #008000;">*/

<span style="color: #0000ff;">public <span style="color: #0000ff;">class<span style="color: #000000;"> Example3 {

<span style="color: #0000ff;">public <span style="color: #0000ff;">static <span style="color: #0000ff;">void main(String[] args) <span style="color: #0000ff;">throws<span style="color: #000000;"> Exception{

File directory = <span style="color: #0000ff;">new File("D:/test"<span style="color: #000000;">);

<span style="color: #008000;">//<span style="color: #008000;"> 轮询间隔 5 秒

<span style="color: #0000ff;">long interval = TimeUnit.SECONDS.toMillis(5<span style="color: #000000;">);

<span style="color: #008000;">//<span style="color: #008000;"> 创建一个文件观察器用于处理文件的格式

FileAlterationObserver observer = <span style="color: #0000ff;">new<span style="color: #000000;"> FileAlterationObserver(directory,FileFilterUtils.and(

FileFilterUtils.fileFileFilter(),FileFilterUtils.suffixFileFilter(".txt"<span style="color: #000000;">)));

<span style="color: #008000;">//<span style="color: #008000;">设置文件变化监听器

observer.addListener(<span style="color: #0000ff;">new<span style="color: #000000;"> MyFileListener());

FileAlterationMonitor monitor = <span style="color: #0000ff;">new<span style="color: #000000;"> FileAlterationMonitor(interval,observer);

monitor.start();

<span style="color: #008000;">//<span style="color: #008000;">Thread.sleep(30000);

<span style="color: #008000;">//<span style="color: #008000;">monitor.stop();

<span style="color: #000000;">    }

}

<span style="color: #0000ff;">final <span style="color: #0000ff;">class MyFileListener <span style="color: #0000ff;">implements<span style="color: #000000;"> FileAlterationListener{

@Override

<span style="color: #0000ff;">public <span style="color: #0000ff;">void<span style="color: #000000;"> onStart(FileAlterationObserver fileAlterationObserver) {

System.out.println("monitor start scan files.."<span style="color: #000000;">);

}
@Override

<span style="color: #0000ff;">public <span style="color: #0000ff;">void<span style="color: #000000;"> onDirectoryCreate(File file) {

System.out.println(file.getName()+" director created."<span style="color: #000000;">);

}
@Override

<span style="color: #0000ff;">public <span style="color: #0000ff;">void<span style="color: #000000;"> onDirectoryChange(File file) {

System.out.println(file.getName()+" director changed."<span style="color: #000000;">);

}
@Override

<span style="color: #0000ff;">public <span style="color: #0000ff;">void<span style="color: #000000;"> onDirectoryDelete(File file) {

System.out.println(file.getName()+" director deleted."<span style="color: #000000;">);

}
@Override

<span style="color: #0000ff;">public <span style="color: #0000ff;">void<span style="color: #000000;"> onFileCreate(File file) {

System.out.println(file.getName()+" created."<span style="color: #000000;">);

}
@Override

<span style="color: #0000ff;">public <span style="color: #0000ff;">void<span style="color: #000000;"> onFileChange(File file) {

System.out.println(file.getName()+" changed."<span style="color: #000000;">);

}
@Override

<span style="color: #0000ff;">public <span style="color: #0000ff;">void<span style="color: #000000;"> onFileDelete(File file) {

System.out.println(file.getName()+" deleted."<span style="color: #000000;">);

}
@Override

<span style="color: #0000ff;">public <span style="color: #0000ff;">void<span style="color: #000000;"> onStop(FileAlterationObserver fileAlterationObserver) {

System.out.println("monitor stop scanning.."<span style="color: #000000;">);

}

}