What is URLEncoding ?

Utility class for HTML form decoding. This class contains static methods for decoding a String from the application/x-www-form-urlencoded MIME format.

To conversion process is the reverse of that used by the URLEncoder class. It is assumed that all characters in the encoded string are one of the following: “a” through “z“, “A” through “Z“, “0” through “9“, and “-“, “_“, “.“, and “*“. The character “%” is allowed but is interpreted as the start of a special escaped sequence.

The following rules are applied in the conversion:


  • The alphanumeric characters “a” through “z“, “A” through “Z” and “0” through “9” remain the same.
  • The special characters “.“, “-“, “*“, and “_” remain the same.
  • The plus sign “+” is converted into a space character “ ” .
  • A sequence of the form “%xy” will be treated as representing a byte where xy is the two-digit hexadecimal representation of the 8 bits. Then, all substrings that contain one or more of these byte sequences consecutively will be replaced by the character(s) whose encoding would result in those consecutive bytes. The encoding scheme used to decode these characters may be specified, or if unspecified, the default encoding of the platform will be used.

About rajkirpal

i am a software engineer. and i have decent knowledge about java technologies like ANDROID, Servlet, Jsp, Struts, Hibernet, Spring, J2ME, Java Script, Ajax, JQuery, CSS. Further i am Preparing Easy understandable materials/documents upon the same java technologies and developing project in core java , advanced java and j2me , ANDROID as per the requirements Also designing the web sites and logos Thank You.
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