Here you can find the source of copyFiles(File src, File dest)
| Parameter | Description |
|---|---|
| src | -- A File object that represents the source for the copy |
| dest | -- A File object that represnts the destination for the copy. |
| Parameter | Description |
|---|---|
| IOException | if unable to copy. |
public static void copyFiles(File src, File dest) throws IOException
//package com.java2s; /******************************************************************************* * Copyright 2014 United States Government as represented by the * Administrator of the National Aeronautics and Space Administration. * All Rights Reserved./*from www. j a va 2s .co m*/ * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. ******************************************************************************/ import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; public class Main { /** * This function will copy files or directories from one location to another. note that the source and the destination must be mutually exclusive. This function can not be used to copy a directory * to a sub directory of itself. The function will also have problems if the destination files already exist. * * @param src * -- A File object that represents the source for the copy * @param dest * -- A File object that represnts the destination for the copy. * @throws IOException * if unable to copy. */ public static void copyFiles(File src, File dest) throws IOException { // Check to ensure that the source is valid... if (!src.exists()) { throw new IOException("copyFiles: Can not find source: " + src.getAbsolutePath() + "."); } else if (!src.canRead()) { // check to ensure we have rights to the source... throw new IOException("copyFiles: No right to source: " + src.getAbsolutePath() + "."); } // is this a directory copy? if (src.isDirectory()) { if (!dest.exists()) { // does the destination already exist? // if not we need to make it exist if possible (note this is mkdirs not mkdir) if (!dest.mkdirs()) { throw new IOException("copyFiles: Could not create direcotry: " + dest.getAbsolutePath() + "."); } } // get a listing of files... String list[] = src.list(); // copy all the files in the list. for (int i = 0; i < list.length; i++) { File dest1 = new File(dest, list[i]); File src1 = new File(src, list[i]); copyFiles(src1, dest1); } } else { // This was not a directory, so lets just copy the file FileInputStream fin = null; FileOutputStream fout = null; byte[] buffer = new byte[4096]; // Buffer 4K at a time (you can change this). int bytesRead; try { // open the files for input and output fin = new FileInputStream(src); fout = new FileOutputStream(dest); // while bytesRead indicates a successful read, lets write... while ((bytesRead = fin.read(buffer)) >= 0) { fout.write(buffer, 0, bytesRead); } } catch (IOException e) { // Error copying file... IOException wrapper = new IOException("copyFiles: Unable to copy file: " + src.getAbsolutePath() + "to" + dest.getAbsolutePath() + "."); wrapper.initCause(e); wrapper.setStackTrace(e.getStackTrace()); throw wrapper; } finally { // Ensure that the files are closed (if they were open). if (fin != null) { fin.close(); } if (fout != null) { fout.close(); } } } } }