public class URLDecoder extends Object
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:
a
" through "z
", "A
" through "Z
" and "0
" through "9
" remain the same. .
", "-
", "*
", and "_
" remain the same. +
" is converted into a space character " " . %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 charset 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.
Modifier and Type | Method | Description |
---|---|---|
static String |
decode |
Deprecated. The resulting string may vary depending on the default charset. |
static String |
decode |
Decodes an application/x-www-form-urlencoded string using a specific encoding scheme. |
static String |
decode |
Decodes an application/x-www-form-urlencoded string using a specific Charset. |
@Deprecated public static String decode(String s)
x-www-form-urlencoded
string. The default charset is used to determine what characters are represented by any consecutive sequences of the form "%xy
".s
- the String
to decodeString
public static String decode(String s, String enc) throws UnsupportedEncodingException
application/x-www-form-urlencoded
string using a specific encoding scheme. This method behaves the same as decode(java.lang.String,java.nio.charset.Charset) except that it will look up the charset using the given encoding name.
IllegalArgumentException
when illegal strings are encountered.s
- the String
to decodeenc
- The name of a supported character encoding.String
UnsupportedEncodingException
- If character encoding needs to be consulted, but named character encoding is not supportedpublic static String decode(String s, Charset charset)
application/x-www-form-urlencoded
string using a specific Charset. The supplied charset 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.
IllegalArgumentException
when illegal strings are encountered.s
- the String
to decodecharset
- the given charsetString
NullPointerException
- if s
or charset
is null
IllegalArgumentException
- if the implementation encounters illegal characters
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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/net/URLDecoder.html