Class URLDecoder
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 wherexy 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 anIllegalArgumentException. Which approach the decoder takes is left to the implementation.
- Since:
- 1.2
- See Also:
Method Summary
Modifier and TypeMethodDescriptionstaticStringDeprecated.The resulting string may vary depending on the default charset.staticStringDecodes anapplication/x-www-form-urlencodedstring using a specific encoding scheme.staticStringDecodes anapplication/x-www-form-urlencodedstring using a specificCharset.
Method Details
decode
Deprecated.The resulting string may vary depending on the default charset. Instead, use the decode(String,String) method to specify the encoding.Decodes ax-www-form-urlencodedstring. The default charset is used to determine what characters are represented by any consecutive sequences of the form "%xy".- Parameters:
s- theStringto decode- Returns:
- the newly decoded
String - Throws:
IllegalArgumentException- if the implementation encounters malformed escape sequences
decode
Decodes anapplication/x-www-form-urlencodedstring using a specific encoding scheme.This method behaves the same asdecode(java.lang.String,java.nio.charset.Charset) except that it willlook up the charset using the given encoding name.
- Parameters:
s- theStringto decodeenc- The name of a supportedcharacter encoding.- Returns:
- the newly decoded
String - Throws:
UnsupportedEncodingException- If character encoding needs to be consulted, but named character encoding is not supportedIllegalArgumentException- if the implementation encounters malformed escape sequences- Since:
- 1.4
- See Also:
decode
Decodes anapplication/x-www-form-urlencodedstring using a specificCharset. The supplied charset is used to determine what characters are represented by any consecutive escape sequences of the form "%xy". Erroneous bytes are replaced with the suppliedCharset'sreplacement value.Note: The World Wide Web Consortium Recommendation states that UTF-8 should be used. Not doing so may introduce incompatibilities.
- Parameters:
s- theStringto decodecharset- the given charset- Returns:
- the newly decoded
String - Throws:
NullPointerException- ifsorcharsetisnullIllegalArgumentException- if the implementation encounters malformed escape sequences- Since:
- 10
- External Specifications
- See Also: