Review/comment needed for the new public java.util.Base64 class

Xueming Shen xueming.shen at
Wed Oct 10 17:54:37 UTC 2012

A standard/public API for Base64 encoding and decoding has been long
overdue. JDK8  has a JEP [1] for this particular request.

Here is the draft proposal to add a public Base64 utility class for JDK8.

This class basically provides 4 variants of Base64 encoding scheme,

(1) the default RFC 4648, which uses standard mapping, no line breaks,
(2) the URL-safe RFE 4648, no line breaks, use "-" and "_" to replace 
"+" and
     "/" for the mapping
(3) the default MIME style, as in RFC 2045 (and its earlier versions), 
which uses
     "standard" base64 mapping, a 76 characters per line limit and uses 
crlf pair
      \r\n for line break.
(4) an extend-able MIME base64, with the char-per-line and the line 
      specified by developer.

The encoder/decoder now provides encoding and decoding for byte[], String,
ByteBuffer and a pair of "EncoderInputStream" and "DecoderOutputStrream",
which we believe/hope should satisfy most of the common use cases. 
method(s) can be added if strongly desired.

We tried couple slightly different styles of design for such this 
"simple" utility
class [2].  We kinda concluded that the version proposed probably provides
the best balance among readability, usability and extensibility.

Please help review and comment on the API and implementation.



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