JAVA-619: Split or move core-java-modules/core-java-io-apis module

libraries-apache-commons/README.md

@@ -13,3 +13,4 @@ This module contains articles about Apache Commons libraries.
 - [Apache Commons BeanUtils](https://www.baeldung.com/apache-commons-beanutils)
 - [Histograms with Apache Commons Frequency](https://www.baeldung.com/apache-commons-frequency)
 - [An Introduction to Apache Commons Lang 3](https://www.baeldung.com/java-commons-lang-3)
+- [Differences Between the Java WatchService API and the Apache Commons IO Monitor Library](https://www.baeldung.com/java-watchservice-vs-apache-commons-io-monitor-library)

libraries-apache-commons/pom.xml

@@ -57,6 +57,11 @@
             <artifactId>xchart</artifactId>
             <version>${xchart-version}</version>
         </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>${common-io.version}</version>
+        </dependency>
     </dependencies>
 
     <properties>
@@ -68,6 +73,7 @@
         <commons.dbutils.version>1.6</commons.dbutils.version>
         <xchart-version>3.5.2</xchart-version>
         <common-math3.version>3.6.1</common-math3.version>
+        <common-io.version>2.5</common-io.version>
     </properties>
 
 </project>

libraries-apache-commons/src/main/java/com/baeldung/dirmonitoring/DirectoryMonitoringExample.java

@@ -0,0 +1,42 @@
+package com.baeldung.dirmonitoring;
+
+import org.apache.commons.io.monitor.FileAlterationListener;
+import org.apache.commons.io.monitor.FileAlterationListenerAdaptor;
+import org.apache.commons.io.monitor.FileAlterationMonitor;
+import org.apache.commons.io.monitor.FileAlterationObserver;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+
+public class DirectoryMonitoringExample {
+
+    private static final Logger LOG = LoggerFactory.getLogger(DirectoryMonitoringExample.class);
+
+    private static final int POLL_INTERVAL = 500;
+
+    public static void main(String[] args) throws Exception {
+        FileAlterationObserver observer = new FileAlterationObserver(System.getProperty("user.home"));
+        FileAlterationMonitor monitor = new FileAlterationMonitor(POLL_INTERVAL);
+        FileAlterationListener listener = new FileAlterationListenerAdaptor() {
+            @Override
+            public void onFileCreate(File file) {
+                LOG.debug("File: " + file.getName() + " created");
+            }
+
+            @Override
+            public void onFileDelete(File file) {
+                LOG.debug("File: " + file.getName() + " deleted");
+            }
+
+            @Override
+            public void onFileChange(File file) {
+                LOG.debug("File: " + file.getName() + " changed");
+            }
+        };
+        observer.addListener(listener);
+        monitor.addObserver(observer);
+        monitor.start();
+
+    }
+}