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Categories / Java / File Input Output

 

Copy and overwrite files

//  Ahy - A pure java CMS. //  Copyright (C) 2010 Sidney Leal (manish.com.br) // //  This program is free software: you can redistribute it and/or modify //  it under the terms of the GNU General Public License as published by //  the Free Software Foundation, either version 3 of the License, or //  (at your option) any later version. // //  This program is distributed in the hope that it will be useful, //  but WITHOUT ANY WARRANTY; without even the implied warranty of //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the //  GNU General Public License for more details. // //  You should have received a copy of the GNU General Public License //  along with this program.  If not, see <http://www.gnu.org/licenses/>. //package br.com.manish.ahy.kernel.util; import java.io.BufferedInputStream; import java.io.ByteArrayOutputStream; import java.io.DataInputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; public final class FileUtil {     public static void copyFile(String from, String to) {         copyFile(from, to, Boolean.FALSE);     }     public static void copyFile(String from, String to, Boolean overwrite) {         try {             File fromFile = new File(from);             File toFile = new File(to);             if (!fromFile.exists()) {                 throw new IOException("File not found: " + from);             }             if (!fromFile.isFile()) {                 throw new IOException("Can't copy directories: " + from);             }             if (!fromFile.canRead()) {                 throw new IOException("Can't read file: " + from);             }             if (toFile.isDirectory()) {                 toFile = new File(toFile, fromFile.getName());             }             if (toFile.exists() && !overwrite) {                 throw new IOException("File already exists.");             } else {                 String parent = toFile.getParent();                 if (parent == null) {                     parent = System.getProperty("user.dir");                 }                 File dir = new File(parent);                 if (!dir.exists()) {                     throw new IOException("Destination directory does not exist: " + parent);                 }                 if (dir.isFile()) {                     throw new IOException("Destination is not a valid directory: " + parent);                 }                 if (!dir.canWrite()) {                     throw new IOException("Can't write on destination: " + parent);                 }             }             FileInputStream fis = null;             FileOutputStream fos = null;             try {                 fis = new FileInputStream(fromFile);                 fos = new FileOutputStream(toFile);                 byte[] buffer = new byte[4096];                 int bytesRead;                 while ((bytesRead = fis.read(buffer)) != -1) {                     fos.write(buffer, 0, bytesRead);                 }             } finally {                 if (from != null) {                     try {                         fis.close();                     } catch (IOException e) {                       System.out.println(e);                     }                 }                 if (to != null) {                     try {                         fos.close();                     } catch (IOException e) {                         System.out.println(e);                     }                 }             }         } catch (Exception e) {             System.out.println("Problems when copying file.");         }     } }