apache codec.shiyong bianjiema,jarbao-Codec was formed as an attempt to focus development effort on one definitive implementation of the Base64 encoder. At the time of Codec s proposal, there were approximately 34 different Java classes that dealt with Base64 encoding spread over the Foundation s CVS repository. Developers in the Jakarta Tomcat project had implemented an original version of the Base64 codec which had been copied by the Commons HttpClient and Apache XML project s XML-RPC subproject. After almost one year, the two forked versions of Base64 had significantly diverged from one another. XML-RPC had applied numerous fixes and patches which were not applied to the Commons HttpClient Base64. Different subprojects had differing implementations at various levels of compliance with the RFC 2045.