Java FileChannel Copy copy0(File src, File dest)

Description

copy the src file to dest.

License

Apache License

Parameter

Parameter	Description
src	a parameter
dest	a parameter

Exception

Parameter	Description
IOException	an exception

Declaration

public static long copy0(File src, File dest) throws IOException 

Method Source Code

//package com.java2s;
/*/*from  w  ww . ja v a2s .c  o  m*/
 * Copyright 2002-2012 the original author or authors.
 *
 * 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.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.channels.FileChannel;

public class Main {
    /**
     * copy the src file to dest. orignal file's date is preserved.
     * 
     * @param src
     * @param dest
     * @return
     * @throws IOException
     */
    public static long copy0(File src, File dest) throws IOException {
        long size = 0;
        InputStream in = null;
        OutputStream out = null;
        try {
            in = new BufferedInputStream(new FileInputStream(src));
            out = new BufferedOutputStream(new FileOutputStream(dest));
            size = copy(in, out);
        } finally {
            if (out != null) {
                out.close();
            }
            if (in != null) {
                in.close();
            }
        }

        if (!dest.setLastModified(src.lastModified())) {
            throw new IOException("Fail to set date: " + dest);
        }
        return size;
    }

    /**
     * copy the in to out
     * 
     * @param in
     * @param out
     * @return
     * @throws IOException
     */
    @SuppressWarnings("PMD")
    public static long copy(InputStream in, OutputStream out) throws IOException {
        byte[] buf = new byte[1024 * 64];
        long total = 0;
        int size = 0;
        while ((size = in.read(buf)) != -1) {
            out.write(buf, 0, size);
            total += size;
        }

        return total;
    }

    public static long copy(File src, File dest) throws IOException {
        FileChannel in = null;
        FileChannel out = null;
        try {
            in = new FileInputStream(src).getChannel();
            out = new FileOutputStream(dest).getChannel();
            return in.transferTo(0, in.size(), out);
        } finally {
            if (out != null) {
                out.close();
            }
            if (in != null) {
                in.close();
            }
        }
    }
}

Related

1. copy(final String aSrcPath, final String aDestPath)
2. copy(String fromPath, String toPath)
3. copy(String source, String destination)
4. copy(String source, String destination, boolean recursive)
5. copy(String sourceFile, String targetFile)
6. copy12(File file1, File file2)
7. copy2(String sourceFileName, String destFileName)
8. copyAFile(File source, File target)
9. copyAll(File source, File targetDir)