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java.net
Class URLEncoder
java.lang.Object
java.net.URLEncoder
-
public class URLEncoder
- extends Object
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).
-
Since:
-
JDK1.0
Method Summary
|
static
String
|
encode
(
String
s)
Deprecated.
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,
String
enc)
Translates a string into application/x-www-form-urlencoded format using a specific encoding scheme. |
Methods inherited from class java.lang.
Object
|
clone
,
equals
,
finalize
,
getClass
,
hashCode
,
notify
,
notifyAll
,
toString
,
wait
,
wait
,
wait
|
encode
@Deprecated
public static Stringencode(String s)
-
Deprecated.
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 to be translated.
-
Returns:
-
the translated String.
encode
public static String encode(String s,
String enc)
throws UnsupportedEncodingException
-
Translates a string into application/x-www-form-urlencoded format using a specific encoding scheme. This method uses the supplied encoding scheme 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 incompatibilites.
-
-
Parameters:
-
s - String to be translated.
-
enc - The name of a supported
character encoding
.
-
Returns:
-
the translated String.
-
Throws:
-
UnsupportedEncodingException
- If the named encoding is not supported
-
Since:
-
1.4
-
See Also:
-
URLDecoder.decode(java.lang.String, java.lang.String)