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

 

Method Detail

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)