Base64 - JRE Emulation | JRE Emulation
public class

Base64

extends Object
java.lang.Object
   ↳ java.util.Base64

Class Overview

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.

Summary

Nested Classes
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 Methods
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 Methods
[Expand]
From class java.lang.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.