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How to encode URL?

URL Encoder in Java

URLEncoder is the utility class for HTML form encoding is part of JDK API. This class contains static methods for converting a String to the application/x-www-form-urlencoded MIME format. Custom encoders can also be built using simple String replacement techniques, however we used use this when the built-in encode does not serve our needs.


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).


The following output is generated.

Url to to encode : Russel&age=32&prefs=a,b,c&grade=+1
Final Encoded Url :


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