Java FileInputStream Copy copyFile(File srcFile, File destFile)

Description

Copy a file preserving the date.

License

Open Source License

Parameter

Parameter	Description
srcFile	the validated source file, must not be <code>null</code>
destFile	the validated destination file, must not be <code>null</code>

Exception

Parameter	Description
IOException	if an error occurs

Declaration

public static void copyFile(File srcFile, File destFile) throws IOException 

Method Source Code

//package com.java2s;
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 {
    /**/*w w w.j a  v  a  2s.c o  m*/
     * The default buffer size to use.
     */
    private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;

    /**
     * Copy a file preserving the date.
     * 
     * @param srcFile  the validated source file, must not be <code>null</code>
     * @param destFile  the validated destination file, must not be <code>null</code>
     * @throws IOException if an error occurs
     */
    public static void copyFile(File srcFile, File destFile) throws IOException {
        if (destFile.exists() && destFile.isDirectory()) {
            throw new IOException("Destination '" + destFile + "' exists but is a directory");
        }

        FileInputStream input = new FileInputStream(srcFile);
        try {
            FileOutputStream output = new FileOutputStream(destFile);
            try {
                copy(input, output);
            } finally {
                close(output);
            }
        } finally {
            close(input);
        }

        if (srcFile.length() != destFile.length()) {
            throw new IOException("Failed to copy full contents from '" + srcFile + "' to '" + destFile + "'");
        }
        destFile.setLastModified(srcFile.lastModified());
    }

    /**
     * Copy bytes from an <code>InputStream</code> to an
     * <code>OutputStream</code>.
     * 
     * @param input  the <code>InputStream</code> to read from
     * @param output  the <code>OutputStream</code> to write to
     * @return the number of bytes copied
     * @throws NullPointerException if the input or output is null
     * @throws IOException if an I/O error occurs
     * @throws ArithmeticException if the byte count is too large
     */
    public static int copy(InputStream input, OutputStream output) throws IOException {
        byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
        long count = 0;
        int n = 0;
        while (-1 != (n = input.read(buffer))) {
            output.write(buffer, 0, n);
            count += n;
        }
        if (count > Integer.MAX_VALUE) {
            return -1;
        }
        return (int) count;
    }

    /**
     * Close an <code>InputStream</code> ignoring exceptions.
     * @param input  the InputStream to close, may be null or already closed
     */
    public static void close(InputStream input) {
        try {
            if (input != null) {
                input.close();
            }
        } catch (IOException ioe) {
            // ignore
        }
    }

    /**
     * Close an <code>OutputStream</code> ignoring exceptions.
     * @param output  the OutputStream to close, may be null or already closed
     */
    public static void close(OutputStream output) {
        try {
            if (output != null) {
                output.close();
            }
        } catch (IOException ioe) {
            // ignore
        }
    }
}

Related

1. CopyFile(File srcFile, File destFile)
2. copyFile(File srcFile, File destFile)
3. copyFile(File srcFile, File destFile)
4. copyFile(File srcFile, File destFile)
5. copyFile(File srcFile, File destFile)
6. copyFile(File srcFile, File destFile, boolean recursive)
7. copyFile(File srcFile, File dstFile)
8. copyFile(File srcFile, File dstFile)
9. copyFile(File srcFile, File dstFile)