1.8 URI Encoding

The classes URLEncoder and URLDecoder provide Methods for character encodings and decoding
- static String encode(String s, String enc)
- static String decode(String s, String enc)
Character encodings should conform with the RFC 2396 standard

The following rules apply:

The characters a-z, A-Z, 0-9, ., -, *, and _ remain the same.
The space character is converted into +.
The other characters are first converted into a sequence of bytes using the specified encoding scheme. Then each byte is represented by a two-digit hexadecimal number prefixed by %.

+	! %21	" %22	# %23	$ %24	% %25	& %26	' %27	( %28	) %29

* *	+ %2B	, %2C	- -	. .	/ %2F	0 0	1 1	2 2	3 3

4 4	5 5	6 6	7 7	8 8	9 9	: %3A	; %3B	< %3C	= %3D

> %3E	? %3F	@ %40	A A	B B	C C	D D	E E	F F	G G

H H	I I	J J	K K	L L	M M	N N	O O	P P	Q Q

R R	S S	T T	U U	V V	W W	X X	Y Y	Z Z	[ %5B

\ %5C	] %5D	^ %5E	_ _	` %60	a a	b b	c c	d d	e e

f f	g g	h h	i i	j j	k k	l l	m m	n n	o o

p p	q q	r r	s s	t t	u u	v v	w w	x x	y y

z z	{ %7B	\| %7C	} %7D	~ %7E	α %CE%B1	א %D7%90	ش %D8%B4	⊆ %E2%8A%86	乔 %E4%B9%94

<..char encodings ..>

char alpha = (char) Integer.parseInt( "2192", 16);
char beta  = (char) Integer.parseInt( "FE38", 16);
String s =
     "http://The."
   + URLEncoder.encode( alpha + " + " + beta , "utf-8" )
   + ".host/"
   + URLEncoder.encode( "@!?" , "utf-8" )
   + ".html"
   ;
System.out.println( s );
URL url = new URL( s );
//...
s = URLDecoder.decode( "%40%41%42%43%21" , "utf-8" );
System.out.println( s );

-_-_-

http://The.%E2%86%92+%2B+%EF%B8%B8.host/%40%21%3F.html
@ABC!

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