Added in API level 1

URLDecoder

open class URLDecoder
kotlin.Any
   ↳ java.net.URLDecoder

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 java.lang.IllegalArgumentException. Which approach the decoder takes is left to the implementation.

Summary

Public constructors

Public methods
open static String!

Decodes a x-www-form-urlencoded string.

open static String!
decode(s: String!, enc: String!)

Decodes an application/x-www-form-urlencoded string using a specific encoding scheme.

open static String!
decode(s: String!, charset: Charset!)

Decodes an application/x-www-form-urlencoded string using a specific Charset.

Public constructors

URLDecoder

Added in API level 1
URLDecoder()

Public methods

decode

Added in API level 1
Deprecated in API level 15
open static fun decode(s: String!): String!

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 String!: the String to decode
Return
String! the newly decoded String

decode

Added in API level 1
open static fun decode(
    s: String!,
    enc: String!
): String!

Decodes an application/x-www-form-urlencoded string using a specific encoding scheme.

This method behaves the same as decode(String s, Charset charset) except that it will look up the charset using the given encoding name.

Parameters
s String!: the String to decode
enc String!: The name of a supported character encoding.
Return
String! the newly decoded String
Exceptions
java.io.UnsupportedEncodingException If character encoding needs to be consulted, but named character encoding is not supported

decode

Added in API level 33
open static fun decode(
    s: String!,
    charset: Charset!
): String!

Decodes an 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.

Parameters
s String!: the String to decode
charset Charset!: the given charset
Return
String! the newly decoded String
Exceptions
java.lang.NullPointerException if s or charset is null
java.lang.IllegalArgumentException if the implementation encounters illegal characters