Here you can find the source of copyDirectory(File source, File target)
public static void copyDirectory(File source, File target) throws IOException
//package com.java2s; /******************************************************************************* * Copyright (c) 2012 Pivotal Software, Inc. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors:/*from w w w. jav a 2s . com*/ * Pivotal Software, Inc. - initial API and implementation *******************************************************************************/ import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; public class Main { /** * Copy the given source directory (and all its contents) to the given * target directory. */ public static void copyDirectory(File source, File target) throws IOException { if (!target.exists()) { target.mkdirs(); } File[] files = source.listFiles(); if (files == null) { return; } for (File sourceChild : files) { String name = sourceChild.getName(); if (name.equals(".svn")) { continue; } File targetChild = new File(target, name); if (sourceChild.isDirectory()) { copyDirectory(sourceChild, targetChild); } else { copy(sourceChild, targetChild); } } } /** * Copy file from src (path to the original file) to dest (path to the * destination file). */ private static void copy(File src, File dest) throws IOException { InputStream in = new FileInputStream(src); try { OutputStream out = new FileOutputStream(dest); try { byte[] buf = new byte[1024]; int len; while ((len = in.read(buf)) > 0) { out.write(buf, 0, len); } } finally { out.close(); } } finally { in.close(); } } }