java.lang.Object
- org.zeroturnaround.zip.commons.IOUtils

```
public class IOUtils
extends java.lang.Object
```
This is a class that has been made significantly smaller (deleted a bunch of methods) and originally is from the Apache Commons IO 2.2 package (the latest version that supports Java 1.5). All license and other documentation is intact. General IO stream manipulation utilities.
This class provides static utility methods for input/output operations.
- closeQuietly - these methods close a stream ignoring nulls and exceptions
- toXxx/read - these methods read data from a stream
- write - these methods write data to a stream
- copy - these methods copy all the data from one stream to another
- contentEquals - these methods compare the content of two streams
The byte-to-char methods and char-to-byte methods involve a conversion step. Two methods are provided in each case, one that uses the platform default encoding and the other which allows you to specify an encoding. You are encouraged to always specify an encoding because relying on the platform default can lead to unexpected results, for example when moving from development to production.
All the methods in this class that read a stream are buffered internally. This means that there is no cause to use a BufferedInputStream or BufferedReader. The default buffer size of 4K has been shown to be efficient in tests.
Wherever possible, the methods in this class do not flush or close the stream. This is to avoid making non-portable assumptions about the streams' origin and further use. Thus the caller is still responsible for closing streams after use.
Origin of code: Excalibur.
Version:

$Id: IOUtils.java 1304177 2012-03-23 03:36:44Z ggregory $

Field Summary

Fields
Modifier and Type	Field	Description
`private static int`	`DEFAULT_BUFFER_SIZE`	The default buffer size (4096) to use for `copyLarge(InputStream, OutputStream)` and `copyLarge(Reader, Writer)`
`static char`	`DIR_SEPARATOR`	The system directory separator character.
`static char`	`DIR_SEPARATOR_UNIX`	The Unix directory separator character.
`static char`	`DIR_SEPARATOR_WINDOWS`	The Windows directory separator character.
`private static int`	`EOF`
`static java.lang.String`	`LINE_SEPARATOR`	The system line separator string.
`static java.lang.String`	`LINE_SEPARATOR_UNIX`	The Unix line separator string.
`static java.lang.String`	`LINE_SEPARATOR_WINDOWS`	The Windows line separator string.

Constructor Summary

Constructors
Constructor Description

IOUtils()
Instances should NOT be constructed in standard programming.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static void`	`closeQuietly(java.io.Closeable closeable)`	Unconditionally close a `Closeable`.
`static void`	`closeQuietly(java.io.InputStream input)`	Unconditionally close an `InputStream`.
`static void`	`closeQuietly(java.io.OutputStream output)`	Unconditionally close an `OutputStream`.
`static boolean`	`contentEquals(java.io.InputStream input1, java.io.InputStream input2)`	Compare the contents of two Streams to determine if they are equal or not.
`static int`	`copy(java.io.InputStream input, java.io.OutputStream output)`	Copy bytes from an `InputStream` to an `OutputStream`.
`static void`	`copy(java.io.InputStream input, java.io.Writer output)`	Copy bytes from an `InputStream` to chars on a `Writer` using the default character encoding of the platform.
`static void`	`copy(java.io.InputStream input, java.io.Writer output, java.lang.String encoding)`	Copy bytes from an `InputStream` to chars on a `Writer` using the specified character encoding.
`static int`	`copy(java.io.Reader input, java.io.Writer output)`	Copy chars from a `Reader` to a `Writer`.
`static long`	`copyLarge(java.io.InputStream input, java.io.OutputStream output)`	Copy bytes from a large (over 2GB) `InputStream` to an `OutputStream`.
`static long`	`copyLarge(java.io.InputStream input, java.io.OutputStream output, byte[] buffer)`	Copy bytes from a large (over 2GB) `InputStream` to an `OutputStream`.
`static long`	`copyLarge(java.io.Reader input, java.io.Writer output)`	Copy chars from a large (over 2GB) `Reader` to a `Writer`.
`static long`	`copyLarge(java.io.Reader input, java.io.Writer output, char[] buffer)`	Copy chars from a large (over 2GB) `Reader` to a `Writer`.
`static byte[]`	`toByteArray(java.io.InputStream input)`	Get the contents of an `InputStream` as a `byte[]`.
`static java.lang.String`	`toString(java.io.InputStream input, java.lang.String encoding)`	Get the contents of an `InputStream` as a String using the specified character encoding.

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

- Field Detail
  - EOF
```
private static final int EOF
```
    See Also:
    
    Constant Field Values
  - DIR_SEPARATOR_UNIX
```
public static final char DIR_SEPARATOR_UNIX
```
    The Unix directory separator character.
    
    See Also:
    
    Constant Field Values
  - DIR_SEPARATOR_WINDOWS
```
public static final char DIR_SEPARATOR_WINDOWS
```
    The Windows directory separator character.
    
    See Also:
    
    Constant Field Values
  - DIR_SEPARATOR
```
public static final char DIR_SEPARATOR
```
    The system directory separator character.
  - LINE_SEPARATOR_UNIX
```
public static final java.lang.String LINE_SEPARATOR_UNIX
```
    The Unix line separator string.
    
    See Also:
    
    Constant Field Values
  - LINE_SEPARATOR_WINDOWS
```
public static final java.lang.String LINE_SEPARATOR_WINDOWS
```
    The Windows line separator string.
    
    See Also:
    
    Constant Field Values
  - LINE_SEPARATOR
```
public static final java.lang.String LINE_SEPARATOR
```
    The system line separator string.
  - DEFAULT_BUFFER_SIZE
```
private static final int DEFAULT_BUFFER_SIZE
```
    The default buffer size (4096) to use for copyLarge(InputStream, OutputStream) and copyLarge(Reader, Writer)
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - IOUtils
```
public IOUtils()
```
    Instances should NOT be constructed in standard programming.
- Method Detail
  - closeQuietly
```
public static void closeQuietly(java.io.InputStream input)
```
    Unconditionally close an InputStream.
    Equivalent to InputStream.close(), except any exceptions will be ignored. This is typically used in finally blocks.
    Example code:
    byte[] data = new byte[1024]; InputStream in = null; try { in = new FileInputStream("foo.txt"); in.read(data); in.close(); //close errors are handled } catch (Exception e) { // error handling } finally { IOUtils.closeQuietly(in); }
    Parameters:
    
    input - the InputStream to close, may be null or already closed
  - closeQuietly
```
public static void closeQuietly(java.io.OutputStream output)
```
    Unconditionally close an OutputStream.
    Equivalent to OutputStream.close(), except any exceptions will be ignored. This is typically used in finally blocks.
    Example code:
    byte[] data = "Hello, World".getBytes(); OutputStream out = null; try { out = new FileOutputStream("foo.txt"); out.write(data); out.close(); //close errors are handled } catch (IOException e) { // error handling } finally { IOUtils.closeQuietly(out); }
    Parameters:
    
    output - the OutputStream to close, may be null or already closed
  - closeQuietly
```
public static void closeQuietly(java.io.Closeable closeable)
```
    Unconditionally close a Closeable.
    Equivalent to Closeable.close(), except any exceptions will be ignored. This is typically used in finally blocks.
    Example code:
    Closeable closeable = null; try { closeable = new FileReader("foo.txt"); // process closeable closeable.close(); } catch (Exception e) { // error handling } finally { IOUtils.closeQuietly(closeable); }
    Parameters:
    
    closeable - the object to close, may be null or already closed
    
    Since:
    
    2.0
  - toByteArray
```
public static byte[] toByteArray(java.io.InputStream input)
                          throws java.io.IOException
```
    Get the contents of an InputStream as a byte[].
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    
    Parameters:
    
    input - the InputStream to read from
    
    Returns:
    
    the requested byte array
    
    Throws:
    
    java.lang.NullPointerException - if the input is null
    
    java.io.IOException - if an I/O error occurs
  - toString
```
public static java.lang.String toString(java.io.InputStream input,
                                        java.lang.String encoding)
                                 throws java.io.IOException
```
    Get the contents of an InputStream as a String using the specified character encoding.
    Character encoding names can be found at IANA.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    
    Parameters:
    
    input - the InputStream to read from
    
    encoding - the encoding to use, null means platform default
    
    Returns:
    
    the requested String
    
    Throws:
    
    java.lang.NullPointerException - if the input is null
    
    java.io.IOException - if an I/O error occurs
  - copy
```
public static int copy(java.io.InputStream input,
                       java.io.OutputStream output)
                throws java.io.IOException
```
    Copy bytes from an InputStream to an OutputStream.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    Large streams (over 2GB) will return a bytes copied value of -1 after the copy has completed since the correct number of bytes cannot be returned as an int. For large streams use the copyLarge(InputStream, OutputStream) method.
    
    Parameters:
    
    input - the InputStream to read from
    
    output - the OutputStream to write to
    
    Returns:
    
    the number of bytes copied, or -1 if > Integer.MAX_VALUE
    
    Throws:
    
    java.lang.NullPointerException - if the input or output is null
    
    java.io.IOException - if an I/O error occurs
    
    Since:
    
    1.1
  - copyLarge
```
public static long copyLarge(java.io.InputStream input,
                             java.io.OutputStream output)
                      throws java.io.IOException
```
    Copy bytes from a large (over 2GB) InputStream to an OutputStream.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    The buffer size is given by DEFAULT_BUFFER_SIZE.
    
    Parameters:
    
    input - the InputStream to read from
    
    output - the OutputStream to write to
    
    Returns:
    
    the number of bytes copied
    
    Throws:
    
    java.lang.NullPointerException - if the input or output is null
    
    java.io.IOException - if an I/O error occurs
    
    Since:
    
    1.3
  - copyLarge
```
public static long copyLarge(java.io.InputStream input,
                             java.io.OutputStream output,
                             byte[] buffer)
                      throws java.io.IOException
```
    Copy bytes from a large (over 2GB) InputStream to an OutputStream.
    This method uses the provided buffer, so there is no need to use a BufferedInputStream.
    
    Parameters:
    
    input - the InputStream to read from
    
    output - the OutputStream to write to
    
    buffer - the buffer to use for the copy
    
    Returns:
    
    the number of bytes copied
    
    Throws:
    
    java.lang.NullPointerException - if the input or output is null
    
    java.io.IOException - if an I/O error occurs
    
    Since:
    
    2.2
  - copy
```
public static void copy(java.io.InputStream input,
                        java.io.Writer output)
                 throws java.io.IOException
```
    Copy bytes from an InputStream to chars on a Writer using the default character encoding of the platform.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    This method uses InputStreamReader.
    
    Parameters:
    
    input - the InputStream to read from
    
    output - the Writer to write to
    
    Throws:
    
    java.lang.NullPointerException - if the input or output is null
    
    java.io.IOException - if an I/O error occurs
    
    Since:
    
    1.1
  - copy
```
public static void copy(java.io.InputStream input,
                        java.io.Writer output,
                        java.lang.String encoding)
                 throws java.io.IOException
```
    Copy bytes from an InputStream to chars on a Writer using the specified character encoding.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    Character encoding names can be found at IANA.
    This method uses InputStreamReader.
    
    Parameters:
    
    input - the InputStream to read from
    
    output - the Writer to write to
    
    encoding - the encoding to use, null means platform default
    
    Throws:
    
    java.lang.NullPointerException - if the input or output is null
    
    java.io.IOException - if an I/O error occurs
    
    Since:
    
    1.1
  - copy
```
public static int copy(java.io.Reader input,
                       java.io.Writer output)
                throws java.io.IOException
```
    Copy chars from a Reader to a Writer.
    This method buffers the input internally, so there is no need to use a BufferedReader.
    Large streams (over 2GB) will return a chars copied value of -1 after the copy has completed since the correct number of chars cannot be returned as an int. For large streams use the copyLarge(Reader, Writer) method.
    
    Parameters:
    
    input - the Reader to read from
    
    output - the Writer to write to
    
    Returns:
    
    the number of characters copied, or -1 if > Integer.MAX_VALUE
    
    Throws:
    
    java.lang.NullPointerException - if the input or output is null
    
    java.io.IOException - if an I/O error occurs
    
    Since:
    
    1.1
  - copyLarge
```
public static long copyLarge(java.io.Reader input,
                             java.io.Writer output)
                      throws java.io.IOException
```
    Copy chars from a large (over 2GB) Reader to a Writer.
    This method buffers the input internally, so there is no need to use a BufferedReader.
    The buffer size is given by DEFAULT_BUFFER_SIZE.
    
    Parameters:
    
    input - the Reader to read from
    
    output - the Writer to write to
    
    Returns:
    
    the number of characters copied
    
    Throws:
    
    java.lang.NullPointerException - if the input or output is null
    
    java.io.IOException - if an I/O error occurs
    
    Since:
    
    1.3
  - copyLarge
```
public static long copyLarge(java.io.Reader input,
                             java.io.Writer output,
                             char[] buffer)
                      throws java.io.IOException
```
    Copy chars from a large (over 2GB) Reader to a Writer.
    This method uses the provided buffer, so there is no need to use a BufferedReader.
    
    Parameters:
    
    input - the Reader to read from
    
    output - the Writer to write to
    
    buffer - the buffer to be used for the copy
    
    Returns:
    
    the number of characters copied
    
    Throws:
    
    java.lang.NullPointerException - if the input or output is null
    
    java.io.IOException - if an I/O error occurs
    
    Since:
    
    2.2
  - contentEquals
```
public static boolean contentEquals(java.io.InputStream input1,
                                    java.io.InputStream input2)
                             throws java.io.IOException
```
    Compare the contents of two Streams to determine if they are equal or not.
    This method buffers the input internally using BufferedInputStream if they are not already buffered.
    
    Parameters:
    
    input1 - the first stream
    
    input2 - the second stream
    
    Returns:
    
    true if the content of the streams are equal or they both don't exist, false otherwise
    
    Throws:
    
    java.lang.NullPointerException - if either input is null
    
    java.io.IOException - if an I/O error occurs

Class IOUtils

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

EOF

DIR_SEPARATOR_UNIX

DIR_SEPARATOR_WINDOWS

DIR_SEPARATOR

LINE_SEPARATOR_UNIX

LINE_SEPARATOR_WINDOWS

LINE_SEPARATOR

DEFAULT_BUFFER_SIZE

Constructor Detail

IOUtils

Method Detail

closeQuietly

closeQuietly

closeQuietly

toByteArray

toString

copy

copyLarge

copyLarge

copy

copy

copy

copyLarge

copyLarge

contentEquals