Utility class for HTML form decoding. This class contains static methods
for decoding a String from the application/x-www-form-urlencoded
MIME format.
The 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.
There are two possible ways in which this decoder could deal with
illegal strings. It could either leave illegal characters alone or
it could throw an IllegalArgumentException
.
Which approach the decoder takes is left to the
implementation.
Public Constructor Summary
Public Method Summary
static String | |
static String |
Inherited Method Summary
Public Constructors
public URLDecoder ()
Public Methods
public static String decode (String s)
This method is deprecated.
The resulting string may vary depending on the platform's
default encoding. Instead, use the decode(String,String) method
to specify the encoding.
Decodes a x-www-form-urlencoded
string.
The platform's default encoding is used to determine what characters
are represented by any consecutive sequences of the form
"%xy
".
Parameters
s | the String to decode |
---|
Returns
- the newly decoded
String
public static String decode (String s, String enc)
Decodes a application/x-www-form-urlencoded
string using a specific
encoding scheme.
The supplied encoding is used to determine
what characters are represented by any consecutive sequences of the
form "%xy
".
Note: The World Wide Web Consortium Recommendation states that UTF-8 should be used. Not doing so may introduce incompatibilities.
Parameters
s | the String to decode |
---|---|
enc | The name of a supported character encoding. |
Returns
- the newly decoded
String
Throws
UnsupportedEncodingException | If character encoding needs to be consulted, but named character encoding is not supported |
---|