com.isti.util
Class URLRefDecoder

java.lang.Object
  com.isti.util.URLRefDecoder

public class URLRefDecoder
extends java.lang.Object

Class URLRefDecoder is a modified version of 'URLDecoder' that has a single-string 'encode()' method that is not deprecated. The code was modified after being lifted from the "java.net.URLDecoder" class from Java 1.4.2_06. Utility class for HTML form decoding. This class contains static methods for decoding a String from the application/x-www-form-urlencoded MIME format.

To conversion process is the reverse of that used by the URLEncoder class. It is assumed that all characters in the encoded string are one of the following: "a" through "z", "A" through "Z", "0" through "9", and "-", "_", ".", and "*". The character "%" is allowed but is interpreted as the start of a special escaped sequence.

The following rules are applied in the conversion:

• The alphanumeric characters "a" through "z", "A" through "Z" and "0" through "9" remain the same.
• The special characters ".", "-", "*", and "_" remain the same.
• The plus sign "+" is converted into a space character " " .
• A sequence of the form "%xy" will be treated as representing a byte where xy is the two-digit hexadecimal representation of the 8 bits. Then, all substrings that contain one or more of these byte sequences consecutively will be replaced by the character(s) whose encoding would result in those consecutive bytes. The encoding scheme used to decode these characters may be specified, or if unspecified, the default encoding of the platform will be used.

There are two possible ways in which this decoder could deal with illegal strings. It could either leave illegal characters alone or it could throw an IllegalArgumentException. Which approach the decoder takes is left to the implementation.

Since:

1.2

Version:

1.23, 01/23/03

Author:

Mark Chamness, Michael McCloskey

Method Summary

static java.lang.String	decode(java.lang.String s) Decodes a x-www-form-urlencoded string.
static java.lang.String	decode(java.lang.String s, java.lang.String enc) Decodes a application/x-www-form-urlencoded string 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

decode

public static java.lang.String decode(java.lang.String s)

Decodes a x-www-form-urlencoded string. "UTF-8" encoding is used to determine what characters are represented by any consecutive sequences of the form "%xy".

Parameters:

s - the String to decode

Returns:

the newly decoded String

decode

public static java.lang.String decode(java.lang.String s,
                                      java.lang.String enc)
                               throws java.io.UnsupportedEncodingException

Decodes a application/x-www-form-urlencoded string using a specific encoding scheme. The supplied encoding is used to determine what characters are represented by any consecutive sequences of the form "%xy".

Note: The World Wide Web Consortium Recommendation states that UTF-8 should be used. Not doing so may introduce incompatibilites.

Parameters:

s - the String to decode

enc - The name of a supported character encoding.

Returns:

the newly decoded String.

Throws:

java.io.UnsupportedEncodingException - If the named encoding is not supported.