Work around for application/x-www-form-urlencoded encoding. Replaces '+' from java.net.URLDecoder with charset specific encoded space value ('%20' for most charsets).
The custom urlEncode method should be replaced with calls to a true URL encoder once available.
git-svn-id: https://src.springframework.org/svn/spring-framework/trunk@2244 50f2f4bb-b051-0410-bef5-90022cba6387