java中decode字符串：

public?class?Utils?{

private?static?Pattern?validStandard??????=?Pattern.compile("%([0-9A-Fa-f]{2})");

private?static?Pattern?choppedStandard????=?Pattern.compile("%[0-9A-Fa-f]{0,1}$");

private?static?Pattern?validNonStandard???=?Pattern.compile("%u([0-9A-Fa-f][0-9A-Fa-f])([0-9A-Fa-f][0-9A-Fa-f])");

private?static?Pattern?choppedNonStandard?=?Pattern.compile("%u[0-9A-Fa-f]{0,3}$");

public?static?String?resilientUrlDecode(String?input)?{

String?cookedInput?=?input;

if?(cookedInput.indexOf('%')?>?-1)?{

//?Transform?all?existing?UTF-8?standard?into?UTF-16?standard.

cookedInput?=?validStandard.matcher(cookedInput).replaceAll("%00%$1");

//?Discard?chopped?encoded?char?at?the?end?of?the?line?(there?is?no?way?to?know?what?it?was)

cookedInput?=?choppedStandard.matcher(cookedInput).replaceAll("");

//?Handle?non?standard?(rejected?by?W3C)?encoding?that?is?used?anyway?by?some

//?See:?http://stackoverflow.com/a/5408655/114196

if?(cookedInput.contains("%u"))?{

//?Transform?all?existing?non?standard?into?UTF-16?standard.

cookedInput?=?validNonStandard.matcher(cookedInput).replaceAll("%$1%$2");

//?Discard?chopped?encoded?char?at?the?end?of?the?line

cookedInput?=?choppedNonStandard.matcher(cookedInput).replaceAll("");

}

}

try?{

return?URLDecoder.decode(cookedInput,"UTF-16");

}?catch?(UnsupportedEncodingException?e)?{

//?Will?never?happen?because?the?encoding?is?hardcoded

return?null;

}

}

}

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