Commons Io 简明教程
Apache Commons IO - FileAlterationMonitor
FileAlterationMonitor 表示在指定的时间间隔内生成监视线程并触发任何注册的 FileAlterationObserver 的线程。
Class Declaration
以下是 org.apache.commons.io.monitor.FileAlterationMonitor 类的声明 −
public final class FileAlterationMonitor
extends Object implements RunnableExample of FileAlterationMonitor Class
以下是我们需要解析的输入文件 -
Welcome to TutorialsPoint. Simply Easy Learning.IOTester.java
import java.io.File;
import java.io.IOException;
import org.apache.commons.io.FileDeleteStrategy;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.monitor.FileAlterationListenerAdaptor;
import org.apache.commons.io.monitor.FileAlterationMonitor;
import org.apache.commons.io.monitor.FileAlterationObserver;
public class IOTester {
public static void main(String[] args) {
try {
usingFileAlterationMonitor();
} catch(IOException e) {
System.out.println(e.getMessage());
}
}
public static void usingFileAlterationMonitor() throws IOException {
//get the file object
File inputFile = FileUtils.getFile("input.txt");
String absolutePath = inputFile.getAbsolutePath();
String parent = absolutePath.substring(0,absolutePath.indexOf("input.txt"));
File parentDirectory = FileUtils.getFile(parent);
FileAlterationObserver observer = new
FileAlterationObserver(parentDirectory);
observer.addListener(new FileAlterationListenerAdaptor(){
@Override
public void onDirectoryCreate(File file) {
System.out.println("Folder created: " + file.getName());
}
@Override
public void onDirectoryDelete(File file) {
System.out.println("Folder deleted: " + file.getName());
}
@Override
public void onFileCreate(File file) {
System.out.println("File created: " + file.getName());
}
@Override
public void onFileDelete(File file) {
System.out.println("File deleted: " + file.getName());
}
});
//create a monitor to check changes after every 500 ms
FileAlterationMonitor monitor = new FileAlterationMonitor(500, observer);
try {
monitor.start();
//create a new directory
File newFolder = new File("test");
File newFile = new File("test1");
newFolder.mkdirs();
Thread.sleep(1000);
newFile.createNewFile();
Thread.sleep(1000);
FileDeleteStrategy.NORMAL.delete(newFolder);
Thread.sleep(1000);
FileDeleteStrategy.NORMAL.delete(newFile);
Thread.sleep(1000);
monitor.stop(10000);
} catch(IOException e) {
System.out.println(e.getMessage());
} catch(InterruptedException e) {
System.out.println(e.getMessage());
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}