Close the input stream after read it and remove redundant util method

pf4j/src/main/java/ro/fortsoft/pf4j/util/Unzip.java

@@ -67,10 +67,11 @@ public class Unzip {
         log.debug("Extract content of '{}' to '{}'", source, destination);
 
         // delete destination file if exists
-        removeDirectory(destination);
-
-    	ZipInputStream zipInputStream = new ZipInputStream(new FileInputStream(source));
+        if (destination.exists() && destination.isDirectory()) {
+            FileUtils.delete(destination.toPath());
+        }
 
+    	try (ZipInputStream zipInputStream = new ZipInputStream(new FileInputStream(source))) {
             ZipEntry zipEntry;
             while ((zipEntry = zipInputStream.getNextEntry()) != null) {
                 try {
@@ -84,42 +85,18 @@ public class Unzip {
                         file.mkdirs();
                     } else {
                         byte[] buffer = new byte[1024];
-        		    int length = 0;
-		            FileOutputStream fos = new FileOutputStream(file);
-
+                        int length;
+                        try (FileOutputStream fos = new FileOutputStream(file)) {
                             while ((length = zipInputStream.read(buffer)) >= 0) {
                                 fos.write(buffer, 0, length);
                             }
-
-		            fos.close();
+                        }
                     }
                 } catch (FileNotFoundException e) {
                     log.error("File '{}' not found", zipEntry.getName());
                 }
             }
-
-    	zipInputStream.close();
-    }
-
-    private boolean removeDirectory(File directory) {
-        if (!directory.exists()) {
-            return true;
         }
-
-        if (!directory.isDirectory()) {
-            return false;
-        }
-
-        File[] files = directory.listFiles();
-        for (File file : files) {
-            if (file.isDirectory()) {
-                removeDirectory(file);
-            } else {
-                file.delete();
-            }
-        }
-
-        return directory.delete();
     }
 
 }