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 charset 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:
- 1.0
- External Specifications
- See Also:
-
Method Summary
Modifier and TypeMethodDescriptionstatic StringDeprecated.The resulting string may vary depending on the default charset.static StringTranslates a string intoapplication/x-www-form-urlencodedformat using a specific encoding scheme.static StringTranslates a string intoapplication/x-www-form-urlencodedformat using a specific Charset.
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Method Details
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encode
Deprecated.The resulting string may vary depending on the default charset. Instead, use the encode(String,String) method to specify the encoding.Translates a string intox-www-form-urlencodedformat. This method uses the default charset as the encoding scheme to obtain the bytes for unsafe characters.- Parameters:
s-Stringto be translated.- Returns:
- the translated
String.
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encode
Translates a string intoapplication/x-www-form-urlencodedformat 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-Stringto 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:
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encode
Translates a string intoapplication/x-www-form-urlencodedformat 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-Stringto be translated.charset- the given charset- Returns:
- the translated
String. - Throws:
NullPointerException- ifsorcharsetisnull.- Since:
- 10
- External Specifications
- See Also:
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