package shuai.study.file.generator;

 import java.io.IOException;

 import java.nio.file.Files;

 import java.nio.file.Paths;

 import java.util.Date;

 import org.apache.log4j.Logger;

 import shuai.study.file.tooler.CommonTooler;

 /**

  * @author shengshu

  *

  */

 public class FileGenerator implements Runnable {

     private static final Logger LOG = Logger.getLogger(FileGenerator.class);

     private String directory = null;

     private static Date date = new Date();

     public FileGenerator(String directory) {

         this.directory = directory;

     }

     private void generator(String directory) {

         for (int i = 0; i < 10; i++) {

             String fileName = CommonTooler.getDateTimeFormat(date) + "-" + Thread.currentThread().getId() + i + ".pm";

             LOG.info("[Path]: " + directory + "/" + fileName);

             try {

                 // Create file (path: directory/fileName)

                 Files.createFile(Paths.get(directory, fileName));

             } catch (IOException ioe) {

                 ioe.printStackTrace();

             }

         }

     }

     @Override

     public void run() {

         this.generator(directory);

     }

 }

 package shuai.study.file.monitor;

 import java.io.File;

 import java.io.IOException;

 import org.apache.commons.io.FileUtils;

 import org.apache.commons.io.FilenameUtils;

 import org.apache.commons.io.filefilter.FileFilterUtils;

 import org.apache.commons.io.monitor.FileAlterationListenerAdaptor;

 import org.apache.commons.io.monitor.FileAlterationMonitor;

 import org.apache.commons.io.monitor.FileAlterationObserver;

 import org.apache.log4j.Logger;

 import shuai.study.file.tooler.CommonTooler;

 /**

  * @author shengshu

  *

  */

 public class FileMonitor extends FileAlterationListenerAdaptor {

     private static final Logger LOG = Logger.getLogger(FileMonitor.class);

     private static FileMonitor fileMonitor;

     private static int pageNumber = 0;

     private FileMonitor() {

     }

     // Get singleton object instance

     public static FileMonitor getFileMonitor() {

         if (fileMonitor == null) {

             synchronized (FileMonitor.class) {

                 if (fileMonitor == null) {

                     fileMonitor = new FileMonitor();

                 }

             }

         }

         return fileMonitor;

     }

     // Create file event

     @Override

     public void onFileCreate(File file) {

         LOG.info("[Create]: " + file.getAbsolutePath());

         String fileAbsolutePath = file.getAbsolutePath();

         String fileAbsoluteParentPath = file.getParent();

         String fileBaseName = FilenameUtils.getBaseName(fileAbsolutePath);

         File destFile = new File(fileAbsoluteParentPath + File.separator + fileBaseName + "-" + CommonTooler.pagingFormat(pageNumber) + ".xml");

         try {

             FileUtils.moveFile(file, destFile);

         } catch (IOException ioe) {

             ioe.printStackTrace();

         }

         pageNumber++;

     }

     // Change file event

     @Override

     public void onFileChange(File file) {

         LOG.info("[Change]: " + file.getAbsolutePath());

     }

     // Delete file event

     @Override

     public void onFileDelete(File file) {

         LOG.info("[Delete]: " + file.getAbsolutePath());

     }

     public void monitor(String directory, int interval) {

         // Observer file whose suffix is pm

         FileAlterationObserver fileAlterationObserver = new FileAlterationObserver(directory, FileFilterUtils.and(FileFilterUtils.fileFileFilter(),

                 FileFilterUtils.suffixFileFilter(".pm")), null);

         // Add listener for event (file create & change & delete)

         fileAlterationObserver.addListener(this);

         // Monitor per interval

         FileAlterationMonitor fileAlterationMonitor = new FileAlterationMonitor(interval, fileAlterationObserver);

         try {

             // Start to monitor

             fileAlterationMonitor.start();

         } catch (Exception e) {

             e.printStackTrace();

         }

     }

 }

 package shuai.study.file.tester;

 import java.io.IOException;

 import java.nio.file.Files;

 import java.nio.file.Paths;

 import org.apache.log4j.Logger;

 import shuai.study.file.generator.FileGenerator;

 import shuai.study.file.monitor.FileMonitor;

 /**

  * @author shengshu

  *

  */

 public class FileTester {

     private static final Logger LOG = Logger.getLogger(FileTester.class);

     private static String directory = "/home/omc/tmp";

     public static void main(String[] args) {

         // Create directory if it does not exist

         try {

             Files.createDirectory(Paths.get(directory));

         } catch (IOException ioe) {

             ioe.printStackTrace();

         }

         LOG.info("File Monitor...");

         // Start to monitor file event per 500 milliseconds

         FileMonitor.getFileMonitor().monitor(directory, 500);

         LOG.info("File Generater...");

         // New runnable instance

         FileGenerator fileGeneratorRunnable = new FileGenerator(directory);

         // Start to multi-thread for generating file

         for (int i = 0; i < 10; i++) {

             Thread fileGeneratorThread = new Thread(fileGeneratorRunnable);

             fileGeneratorThread.start();

         }

     }

 }

 package shuai.study.file.tooler;

 import java.text.SimpleDateFormat;

 import java.util.Date;

 /**

  * @author shengshu

  *

  */

 public class CommonTooler {

     // Date time format

     public static String getDateTimeFormat(Date date) {

         SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd-HHmm");

         String dateTime = simpleDateFormat.format(date);

         return dateTime;

     }

     // Page format

     public static String pagingFormat(int pageNumber) {

         String pageNumberStr = "P00";

         if (pageNumber < 0) {

             throw new NumberFormatException("The page number should not be negative");

         }

         if (pageNumber < 10) {

             pageNumberStr = String.format("P0%d", pageNumber);

         } else {

             pageNumberStr = String.format("P%d", pageNumber);

         }

         return pageNumberStr;

     }

 }