Here you can find the source of copyFile(File src, File dest)
public static void copyFile(File src, File dest) throws IOException
//package com.java2s; /**//w ww .jav a2s.co m * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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.*; public class Main { private static final int DEFAULT_BUFFER_SIZE = 4096; public static void copyFile(File src, File dest) throws IOException { FileInputStream fileSrc = new FileInputStream(src); FileOutputStream fileDest = new FileOutputStream(dest); copyInputStream(fileSrc, fileDest); } public static void copyInputStream(InputStream in, OutputStream out) throws IOException { try { byte[] buffer = new byte[DEFAULT_BUFFER_SIZE]; int len = in.read(buffer); while (len >= 0) { out.write(buffer, 0, len); len = in.read(buffer); } } finally { close(in); close(out); } } public static void close(Writer out) { try { out.close(); } catch (IOException e) { } } public static void close(OutputStream out) { try { out.close(); } catch (IOException e) { } } public static void close(InputStream in) { try { in.close(); } catch (IOException e) { } } }