Java FileInputStream Copy copyFile(File src, File dest)

Description

copy File

License

Apache License

Declaration

public static void copyFile(File src, File dest) throws IOException 

Method Source Code

//package com.java2s;
/**/*from w w  w. j ava  2 s.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.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import java.util.ArrayList;
import java.util.List;

public class Main {
    private static final int DEFAULT_BUFFER_SIZE = 4096;

    public static void copyFile(File src, File dest) throws IOException {
        copyFile(src, dest, null);
    }

    public static void copyFile(File src, File dest, FilenameFilter filter) throws IOException {
        if (src.getCanonicalPath().equals(dest.getCanonicalPath()) == false) {
            if (src.isDirectory()) {

                mkdirs(dest);
                List<File> list = getFiles(src, filter);
                for (File f : list) {
                    if (f.isFile()) {
                        File target = new File(getCopyParent(src, dest, f), f.getName());
                        copySingleFile(f, target);
                    }
                }

            } else if (dest.isDirectory()) {
                mkdirs(dest);
                File target = new File(dest, src.getName());
                copySingleFile(src, target);
            } else {
                copySingleFile(src, dest);
            }
        }
    }

    public static void mkdirs(File dir) throws IOException {
        if (dir.exists()) {
            if (!dir.isDirectory()) {
                throw new IOException(
                        "Failed to create directory '" + dir + "', regular file already existed with that name");
            }

        } else {
            if (!dir.mkdirs()) {
                throw new IOException("Failed to create directory '" + dir + "'");
            }
        }
    }

    static List<File> getFiles(File dir, FilenameFilter filter) {
        List<File> result = new ArrayList<File>();
        getFiles(dir, result, filter);
        return result;
    }

    static void getFiles(File dir, List<File> list, FilenameFilter filter) {
        if (!list.contains(dir)) {
            list.add(dir);
            String[] fileNames = dir.list(filter);
            for (int i = 0; i < fileNames.length; i++) {
                File f = new File(dir, fileNames[i]);
                if (f.isFile()) {
                    list.add(f);
                } else {
                    getFiles(dir, list, filter);
                }
            }
        }
    }

    static File getCopyParent(File from, File to, File src) {
        File result = null;
        File parent = src.getParentFile();
        String fromPath = from.getAbsolutePath();
        if (parent.getAbsolutePath().equals(fromPath)) {
            // one level down
            result = to;
        } else {
            String parentPath = parent.getAbsolutePath();
            String path = parentPath.substring(fromPath.length());
            result = new File(to.getAbsolutePath() + File.separator + path);
        }
        return result;
    }

    public static void copySingleFile(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 {
            in.close();
            out.close();
        }
    }
}

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