Commons IO

IOUtils is a 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

Constant Field Values

Modifier and Type	Field	Description
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.
static int	EOF	Represents the end-of-file (or stream).
static String	LINE_SEPARATOR	The system line separator string.
static String	LINE_SEPARATOR_UNIX	The Unix line separator string.
static String	LINE_SEPARATOR_WINDOWS	The Windows line separator string.

Common Methods

closeQuietly: Close a stream ignoring nulls and exceptions.

InputStream in = ...;
try {
    // do something with the stream
} finally {
    IOUtils.closeQuietly(in);
}

readLines: Gets the contents of an InputStream as a list of Strings, one entry per line.

List<String> lines = IOUtils.readLines(in);

toByteArray: Gets the contents of an InputStream(, String, URL) as a byte[].

byte[] byteArray = IOUtils.toByteArray(new URL("http://www.example.com/"));

toCharArray: Gets the contents of an InputStream(, Reader) as a character array.

char[] byteArray = IOUtils.toCharArray(in);

toInputStream: Converts the specified string(, CharSequence) to an input stream.

InputStream in = IOUtils.toInputStream("string");

toString: Gets the contents of an InputStream(, byte[], URL...) as a String

String str = IOUtils.toString(in);

更多请参考：http://commons.apache.org/proper/commons-io/javadocs/api-release/index.html?org/apache/commons/io/IOUtils.html