Java FileInputStream Copy copyFile(final File fromFile, final File toFile)

Description

Copy file to file.

License

Apache License

Parameter

Parameter	Description
fromFile	the File to copy (readable, non-null file)
toFile	the File to copy to (non-null, parent dir exists)

Exception

Parameter	Description
IOException	an exception

Declaration

public static void copyFile(final File fromFile, final File toFile) throws IOException 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class Main {
    /**//ww  w  . j  av a2  s. c  o  m
     * Buffer to use
     */
    public static final int BUFFER_SIZE = 8192;

    /**
     * Copy file to file.
     *
     * @param fromFile
     *            the File to copy (readable, non-null file)
     * @param toFile
     *            the File to copy to (non-null, parent dir exists)
     * @throws IOException
     */
    public static void copyFile(final File fromFile, final File toFile) throws IOException {
        FileInputStream in = null;
        FileOutputStream out = null;
        try {
            in = new FileInputStream(fromFile);
            out = new FileOutputStream(toFile);
            streamToStream(in, out);
        } finally {
            if (out != null) {
                out.close();
            }
            if (in != null) {
                in.close();
            }
        }
    }

    /**
     * Take a stream to another stream (AND CLOSE BOTH).
     *
     * @param inputStream
     *            to read and close
     * @param outputStream
     *            to (over)write and close
     */
    public static void streamToStream(final InputStream inputStream, final OutputStream outputStream) {
        streamToStream(inputStream, outputStream, true);
    }

    /**
     * Take a stream to another stream.
     *
     * @param inputStream
     *            to read
     * @param outputStream
     *            to (over)write
     * @param close
     *            or not
     */
    public static long streamToStream(final InputStream inputStream, final OutputStream outputStream,
            final boolean close) {
        long bytesWritten = 0;
        try {

            final byte[] buffer = new byte[BUFFER_SIZE];
            int len;
            while ((len = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, len);
                bytesWritten += len;
            }
            if (close) {
                outputStream.close();
                inputStream.close();
            }
            return bytesWritten;
        } catch (final IOException ioEx) {
            // Wrap it
            throw new RuntimeException(ioEx);
        }
    }

    public static void close(final OutputStream outputStream) {
        try {
            if (outputStream != null) {
                outputStream.close();
            }
        } catch (final Exception ex) {
            throw new RuntimeException(ex);
        }
    }

    public static void close(final InputStream inputStream) {
        try {
            if (inputStream != null) {
                inputStream.close();
            }
        } catch (final Exception ex) {
            throw new RuntimeException(ex);
        }
    }
}

Related

1. copyFile(File target, File source)
2. copyFile(File targetFile, File file)
3. copyFile(File targetFile, File file)
4. copyFile(final File from, final File to)
5. copyFile(final File fromFile, final File toFile)
6. copyFile(final File in, final File out)
7. copyFile(final File oldfile, final File newfile)
8. copyFile(final File source, final File dest)
9. copyFile(final File source, final File target)