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Java Standard Edition (SE)

URLEncoder


compact1, compact2, compact3
java.net

Class 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 Detail

      • encode

        @Deprecated
        public 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.
        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.


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