Base64

public class Base64 extends Object

This class consists exclusively of static methods for obtaining encoders and decoders for the Base64 encoding scheme. The implementation of this class supports the following types of Base64 as specified in RFC 4648 and RFC 2045.

• Basic

  Uses "The Base64 Alphabet" as specified in Table 1 of RFC 4648 and RFC 2045 for encoding and decoding operation. The encoder does not add any line feed (line separator) character. The decoder rejects data that contains characters outside the base64 alphabet.

• URL and Filename safe

  Uses the "URL and Filename safe Base64 Alphabet" as specified in Table 2 of RFC 4648 for encoding and decoding. The encoder does not add any line feed (line separator) character. The decoder rejects data that contains characters outside the base64 alphabet.

• MIME

  Uses the "The Base64 Alphabet" as specified in Table 1 of RFC 2045 for encoding and decoding operation. The encoded output must be represented in lines of no more than 76 characters each and uses a carriage return '\r' followed immediately by a linefeed '\n' as the line separator. No line separator is added to the end of the encoded output. All line separators or other characters not found in the base64 alphabet table are ignored in decoding operation.

Unless otherwise noted, passing a null argument to a method of this class will cause a NullPointerException to be thrown.

Nested Class Summary

class	Base64.Decoder		This class implements a decoder for decoding byte data using the Base64 encoding scheme as specified in RFC 4648 and RFC 2045.
class	Base64.Encoder		This class implements an encoder for encoding byte data using the Base64 encoding scheme as specified in RFC 4648 and RFC 2045.

Public Method Summary

static Base64.Decoder	getDecoder() Returns a Base64.Decoder that decodes using the Basic type base64 encoding scheme.
static Base64.Encoder	getEncoder() Returns a Base64.Encoder that encodes using the Basic type base64 encoding scheme.
static Base64.Decoder	getMimeDecoder() Returns a Base64.Decoder that decodes using the MIME type base64 decoding scheme.
static Base64.Encoder	getMimeEncoder() Returns a Base64.Encoder that encodes using the MIME type base64 encoding scheme.
static Base64.Encoder	getMimeEncoder(int lineLength, byte[] lineSeparator) Returns a Base64.Encoder that encodes using the MIME type base64 encoding scheme with specified line length and line separators.
static Base64.Decoder	getUrlDecoder() Returns a Base64.Decoder that decodes using the URL and Filename safe type base64 encoding scheme.
static Base64.Encoder	getUrlEncoder() Returns a Base64.Encoder that encodes using the URL and Filename safe type base64 encoding scheme.

Inherited Method Summary

From class java.lang.Object

Object	clone() Creates and returns a copy of this Object.
boolean	equals(Object obj) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of Class that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long timeout, int nanos) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait(long timeout) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.

Public Methods

public static Base64.Decoder getDecoder ()

Returns a Base64.Decoder that decodes using the Basic type base64 encoding scheme.

Returns

• A Base64 decoder.

public static Base64.Encoder getEncoder ()

Returns a Base64.Encoder that encodes using the Basic type base64 encoding scheme.

Returns

• A Base64 encoder.

public static Base64.Decoder getMimeDecoder ()

Returns a Base64.Decoder that decodes using the MIME type base64 decoding scheme.

Returns

• A Base64 decoder.

public static Base64.Encoder getMimeEncoder ()

Returns a Base64.Encoder that encodes using the MIME type base64 encoding scheme.

Returns

• A Base64 encoder.

public static Base64.Encoder getMimeEncoder (int lineLength, byte[] lineSeparator)

Returns a Base64.Encoder that encodes using the MIME type base64 encoding scheme with specified line length and line separators.

Parameters

lineLength	the length of each output line (rounded down to nearest multiple of 4). If lineLength <= 0 the output will not be separated in lines
lineSeparator	the line separator for each output line

Returns

• A Base64 encoder.

Throws

IllegalArgumentException	if lineSeparator includes any character of "The Base64 Alphabet" as specified in Table 1 of RFC 2045.

public static Base64.Decoder getUrlDecoder ()

Returns a Base64.Decoder that decodes using the URL and Filename safe type base64 encoding scheme.

Returns

• A Base64 decoder.

public static Base64.Encoder getUrlEncoder ()

Returns a Base64.Encoder that encodes using the URL and Filename safe type base64 encoding scheme.

Returns

• A Base64 encoder.