public static String urlEncode(String s) {
StringBuffer sbuf = new StringBuffer();
int len = s.length();
for (int i = 0; i < len; i++) {
int ch = s.charAt(i);
if (‘A’ <= ch && ch <= ‘Z’) { // ‘A’..’Z’
sbuf.append((char)ch);
} else if (‘a’ <= ch && ch <= ‘z’) { // ‘a’..’z’
sbuf.append((char)ch);
} else if (‘0′ <= ch && ch <= ‘9′) { // ‘0′..’9′
sbuf.append((char)ch);
} else if (ch == ‘ ‘) { // space
sbuf.append(‘+’);
} else if (ch == ‘-’ || ch == ‘_’ // unreserved
|| ch == ‘.’ || ch == ‘!’
|| ch == ‘~’ || ch == ‘*’
|| ch == ‘\\’ || ch == ‘(‘
|| ch == ‘)’) {
sbuf.append((char)ch);
} else if (ch <= 0×007f) { // other ASCII
sbuf.append(hex[ch]);
} else if (ch <= 0×07FF) { // non-ASCII <= 0×7FF sbuf.append(hex[0xc0 | (ch >> 6)]);
sbuf.append(hex[0x80 | (ch & 0x3F)]);
} else { // 0×7FF < ch <= 0xFFFF sbuf.append(hex[0xe0 | (ch >> 12)]);
sbuf.append(hex[0x80 | ((ch >> 6) & 0x3F)]);
sbuf.append(hex[0x80 | (ch & 0x3F)]);
}
}
return sbuf.toString();
}
// Hex constants.
final static String[] hex = {
“%00″, “%01″, “%02″, “%03″, “%04″, “%05″, “%06″, “%07″,
“%08″, “%09″, “%0a”, “%0b”, “%0c”, “%0d”, “%0e”, “%0f”,
“%10″, “%11″, “%12″, “%13″, “%14″, “%15″, “%16″, “%17″,
“%18″, “%19″, “%1a”, “%1b”, “%1c”, “%1d”, “%1e”, “%1f”,
“%20″, “%21″, “%22″, “%23″, “%24″, “%25″, “%26″, “%27″,
“%28″, “%29″, “%2a”, “%2b”, “%2c”, “%2d”, “%2e”, “%2f”,
“%30″, “%31″, “%32″, “%33″, “%34″, “%35″, “%36″, “%37″,
“%38″, “%39″, “%3a”, “%3b”, “%3c”, “%3d”, “%3e”, “%3f”,
“%40″, “%41″, “%42″, “%43″, “%44″, “%45″, “%46″, “%47″,
“%48″, “%49″, “%4a”, “%4b”, “%4c”, “%4d”, “%4e”, “%4f”,
“%50″, “%51″, “%52″, “%53″, “%54″, “%55″, “%56″, “%57″,
“%58″, “%59″, “%5a”, “%5b”, “%5c”, “%5d”, “%5e”, “%5f”,
“%60″, “%61″, “%62″, “%63″, “%64″, “%65″, “%66″, “%67″,
“%68″, “%69″, “%6a”, “%6b”, “%6c”, “%6d”, “%6e”, “%6f”,
“%70″, “%71″, “%72″, “%73″, “%74″, “%75″, “%76″, “%77″,
“%78″, “%79″, “%7a”, “%7b”, “%7c”, “%7d”, “%7e”, “%7f”,
“%80″, “%81″, “%82″, “%83″, “%84″, “%85″, “%86″, “%87″,
“%88″, “%89″, “%8a”, “%8b”, “%8c”, “%8d”, “%8e”, “%8f”,
“%90″, “%91″, “%92″, “%93″, “%94″, “%95″, “%96″, “%97″,
“%98″, “%99″, “%9a”, “%9b”, “%9c”, “%9d”, “%9e”, “%9f”,
“%a0″, “%a1″, “%a2″, “%a3″, “%a4″, “%a5″, “%a6″, “%a7″,
“%a8″, “%a9″, “%aa”, “%ab”, “%ac”, “%ad”, “%ae”, “%af”,
“%b0″, “%b1″, “%b2″, “%b3″, “%b4″, “%b5″, “%b6″, “%b7″,
“%b8″, “%b9″, “%ba”, “%bb”, “%bc”, “%bd”, “%be”, “%bf”,
“%c0″, “%c1″, “%c2″, “%c3″, “%c4″, “%c5″, “%c6″, “%c7″,
“%c8″, “%c9″, “%ca”, “%cb”, “%cc”, “%cd”, “%ce”, “%cf”,
“%d0″, “%d1″, “%d2″, “%d3″, “%d4″, “%d5″, “%d6″, “%d7″,
“%d8″, “%d9″, “%da”, “%db”, “%dc”, “%dd”, “%de”, “%df”,
“%e0″, “%e1″, “%e2″, “%e3″, “%e4″, “%e5″, “%e6″, “%e7″,
“%e8″, “%e9″, “%ea”, “%eb”, “%ec”, “%ed”, “%ee”, “%ef”,
“%f0″, “%f1″, “%f2″, “%f3″, “%f4″, “%f5″, “%f6″, “%f7″,
“%f8″, “%f9″, “%fa”, “%fb”, “%fc”, “%fd”, “%fe”, “%ff”
};
