## org.springframework.util
Class FileCopyUtils

    java.lang.Object
      org.springframework.util.FileCopyUtils

    public abstract class FileCopyUtils

extends Object

Simple utility methods for file and stream copying. All copy methods use a block size of 4096 bytes, and close all affected streams when done.

Mainly for use within the framework, but also useful for application code.

Since:
  06.10.2003
Author:
  Juergen Hoeller

Field Summary
`static int` `BUFFER_SIZE`

Constructor Summary
`FileCopyUtils()`

Method Summary
`static void` `copy(byte[] in, File out)` Copy the contents of the given byte array to the given output File.
`static void` `copy(byte[] in, OutputStream out)` Copy the contents of the given byte array to the given OutputStream.
`static int` `copy(File in, File out)` Copy the contents of the given input File to the given output File.
`static int` `copy(InputStream in, OutputStream out)` Copy the contents of the given InputStream to the given OutputStream.
`static int` `copy(Reader in, Writer out)` Copy the contents of the given Reader to the given Writer.
`static void` `copy(String in, Writer out)` Copy the contents of the given String to the given output Writer.
`static byte[]` `copyToByteArray(File in)` Copy the contents of the given input File into a new byte array.
`static byte[]` `copyToByteArray(InputStream in)` Copy the contents of the given InputStream into a new byte array.
`static String` `copyToString(Reader in)` Copy the contents of the given Reader into a String.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### BUFFER_SIZE

    public static final int BUFFER_SIZE

See Also:
  Constant Field Values

Constructor Detail

### FileCopyUtils

    public FileCopyUtils()

Method Detail

### copy

    public static int copy(File in,
                           File out)
                    throws IOException

  Copy the contents of the given input File to the given output File.

  Parameters:
    `in` - the file to copy from
    `out` - the file to copy to
  Returns:
    the number of bytes copied
  Throws:
    `IOException` - in case of I/O errors

### copy

    public static void copy(byte[] in,
                            File out)
                     throws IOException

  Copy the contents of the given byte array to the given output File.

  Parameters:
    `in` - the byte array to copy from
    `out` - the file to copy to
  Throws:
    `IOException` - in case of I/O errors

### copyToByteArray

    public static byte[] copyToByteArray(File in)
                                  throws IOException

  Copy the contents of the given input File into a new byte array.

  Parameters:
    `in` - the file to copy from
  Returns:
    the new byte array that has been copied to
  Throws:
    `IOException` - in case of I/O errors

### copy

    public static int copy(InputStream in,
                           OutputStream out)
                    throws IOException

  Copy the contents of the given InputStream to the given OutputStream. Closes both streams when done.

  Parameters:
    `in` - the stream to copy from
    `out` - the stream to copy to
  Returns:
    the number of bytes copied
  Throws:
    `IOException` - in case of I/O errors

### copy

    public static void copy(byte[] in,
                            OutputStream out)
                     throws IOException

  Copy the contents of the given byte array to the given OutputStream. Closes the stream when done.

  Parameters:
    `in` - the byte array to copy from
    `out` - the OutputStream to copy to
  Throws:
    `IOException` - in case of I/O errors

### copyToByteArray

    public static byte[] copyToByteArray(InputStream in)
                                  throws IOException

  Copy the contents of the given InputStream into a new byte array. Closes the stream when done.

  Parameters:
    `in` - the stream to copy from
  Returns:
    the new byte array that has been copied to
  Throws:
    `IOException` - in case of I/O errors

### copy

    public static int copy(Reader in,
                           Writer out)
                    throws IOException

  Copy the contents of the given Reader to the given Writer. Closes both when done.

  Parameters:
    `in` - the Reader to copy from
    `out` - the Writer to copy to
  Returns:
    the number of characters copied
  Throws:
    `IOException` - in case of I/O errors

### copy

    public static void copy(String in,
                            Writer out)
                     throws IOException

  Copy the contents of the given String to the given output Writer. Closes the write when done.

  Parameters:
    `in` - the String to copy from
    `out` - the Writer to copy to
  Throws:
    `IOException` - in case of I/O errors

### copyToString

    public static String copyToString(Reader in)
                               throws IOException

  Copy the contents of the given Reader into a String. Closes the reader when done.

  Parameters:
    `in` - the reader to copy from
  Returns:
    the String that has been copied to
  Throws:
    `IOException` - in case of I/O errors