Included logger and format in FileUtil class

src/main/java/de/hftstuttgart/dtabackend/utils/FileUtil.java

@@ -4,14 +4,18 @@ import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
- * Helper Class for all file related tasks.
+ * Helper Class for all file-related tasks.
  *
  * Created by Marcel Bochtler on 05.01.17.
  */
 public class FileUtil {
 
+    private static final Logger LOG = LoggerFactory.getLogger(FileUtil.class);
+
     /**
      * Delete the folder and all containing files.
      * @param folder Folder to delete
@@ -23,22 +27,36 @@ public class FileUtil {
                 if (f.isDirectory()) {
                     deleteFolderRecursively(f);
                 } else {
-                    f.delete();
-                System.out.println(String.format("Deleted file: %s", f.getAbsolutePath()));
+                    if (f.delete()) {
+                        LOG.debug("Deleted file: {}", f.getAbsolutePath());
+                    } else {
+                        LOG.debug("Failed to delete file: {}", f.getAbsolutePath());
                     }
                 }
             }
-        folder.delete();
-        System.out.println(String.format("Deleted folder: %s", folder.getAbsolutePath()));
+        }
+        if (folder.delete()) {
+            LOG.debug("Deleted folder: {}", folder.getAbsolutePath());
+        } else {
+            LOG.debug("Failed to delete folder: {}", folder.getAbsolutePath());
+        }
     }
 
+    /**
+     * Copy the folder and its contents.
+     * @param src Source folder path
+     * @param dst Destination folder path
+     * @throws IOException if an I/O error occurs
+     */
     public static void copyFolder(Path src, Path dst) throws IOException {
         Files.walk(src)
             .forEach(source -> {
                 try {
-                    Files.copy(source, dst.resolve(src.relativize(source)));
-                    System.out.println(String.format("Copying file from: %s to %s", source.toString(), dst.resolve(src.relativize(source)).toString()));
+                    Path destination = dst.resolve(src.relativize(source));
+                    Files.copy(source, destination);
+                    LOG.debug("Copying file from: {} to {}", source, destination);
                 } catch (IOException e) {
+                    LOG.debug("Error copying file from: {} to {}", source, dst.resolve(src.relativize(source)), e);
                     throw new RuntimeException(e.getMessage(), e);
                 }
             });