URLEncoder
public
class
URLEncoder
extends Object
java.lang.Object | |
↳ | java.net.URLEncoder |
Utility class for HTML form encoding. This class contains static methods
for converting a String to the application/x-www-form-urlencoded
MIME
format. For more information about HTML form encoding, consult the HTML
specification.
When encoding a String, the following rules apply:
- The alphanumeric characters "
a
" through "z
", "A
" through "Z
" and "0
" through "9
" remain the same. - The special characters "
.
", "-
", "*
", and "_
" remain the same. - The space character " " is
converted into a plus sign "
+
". - All other characters are unsafe and are first converted into
one or more bytes using some encoding scheme. Then each byte is
represented by the 3-character string
"
%xy
", where xy is the two-digit hexadecimal representation of the byte. The recommended encoding scheme to use is UTF-8. However, for compatibility reasons, if an encoding is not specified, then the default encoding of the platform is used.
For example using UTF-8 as the encoding scheme the string "The string ü@foo-bar" would get converted to "The+string+%C3%BC%40foo-bar" because in UTF-8 the character ü is encoded as two bytes C3 (hex) and BC (hex), and the character @ is encoded as one byte 40 (hex).
Summary
Public methods | |
---|---|
static
String
|
encode(String s, String enc)
Translates a string into |
static
String
|
encode(String s)
This method was deprecated in API level 15. The resulting string may vary depending on the platform's default encoding. Instead, use the encode(String,String) method to specify the encoding. |
static
String
|
encode(String s, Charset charset)
Translates a string into |
Inherited methods | |
---|---|
Public methods
encode
public static String encode (String s, String enc)
Translates a string into application/x-www-form-urlencoded
format using a specific encoding scheme.
This method behaves the same as encode(String s, Charset charset) except that it will look up the charset using the given encoding name.
Parameters | |
---|---|
s |
String : String to be translated. |
enc |
String : The name of a supported
character
encoding. |
Returns | |
---|---|
String |
the translated String . |
Throws | |
---|---|
UnsupportedEncodingException |
If the named encoding is not supported |
encode
public static String encode (String s)
This method was deprecated
in API level 15.
The resulting string may vary depending on the platform's
default encoding. Instead, use the encode(String,String)
method to specify the encoding.
Translates a string into x-www-form-urlencoded
format. This method uses the platform's default encoding
as the encoding scheme to obtain the bytes for unsafe characters.
Parameters | |
---|---|
s |
String : String to be translated. |
Returns | |
---|---|
String |
the translated String . |
encode
public static String encode (String s, Charset charset)
Translates a string into application/x-www-form-urlencoded
format using a specific Charset.
This method uses the supplied charset to obtain the bytes for unsafe
characters.
Note: The World Wide Web Consortium Recommendation states that UTF-8 should be used. Not doing so may introduce incompatibilities.
Parameters | |
---|---|
s |
String : String to be translated. |
charset |
Charset : the given charset |
Returns | |
---|---|
String |
the translated String . |
Throws | |
---|---|
NullPointerException |
if s or charset is null . |