从Cookie 中取出来对特殊字符的转换

页面存入Cookie中的值含有特殊字符，但所传的值中包含一些特殊字符比如“：”，Cookie中是无法对特殊字符直接承载的，所以在存入Cookie时，将其转换为unicode编码：
document.cookie = key + "=" + escape(value);
但在action中如果直接取得，是无法将特殊字符的unicode编码转换为想要的，上网搜查相关资料，找到了用java编写的unicode编码的转换的工具类，工程中的Escape就是该工具类，在action中用
String code = Escape.unescape(cookies[i].getValue());
方法转换后就可以将unicode转为我想要的特殊字符。

下面是Escape.java的源代码：

public class Escape
{
private 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" };

private final static byte[] val = { 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x00, 0x01,
0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F };

/**
* <p>Discription:[加码]</p>
* @param s
* @return
* @author:[许狄]
* @update:[日期YYYY-MM-DD] [更改人姓名][变更描述]
*/
public static String escape(String s)
{
StringBuffer sbuf = new StringBuffer();
int len = s.length();
for (int i = 0; i < len; i++)
{
int ch = s.charAt(i);
if (ch == ' ')
{ // space : map to '+'
sbuf.append('+');
}
else if ('A' <= ch && ch <= 'Z')
{ // 'A'..'Z' : as it was
sbuf.append((char) ch);
}
else if ('a' <= ch && ch <= 'z')
{ // 'a'..'z' : as it was
sbuf.append((char) ch);
}
else if ('0' <= ch && ch <= '9')
{ // '0'..'9' : as it was
sbuf.append((char) ch);
}
else if (ch == '-' || ch == '_' // unreserved : as it was
|| ch == '.' || ch == '!' || ch == '~' || ch == '*'
|| ch == '/'' || ch == '(' || ch == ')')
{
sbuf.append((char) ch);
}
else if (ch <= 0x007F)
{ // other ASCII : map to %XX
sbuf.append('%');
sbuf.append(hex[ch]);
}
else
{ // unicode : map to %uXXXX
sbuf.append('%');
sbuf.append('u');
sbuf.append(hex[(ch >>> 8)]);
sbuf.append(hex[(0x00FF & ch)]);
}
}
return sbuf.toString();
}

/**
* <p>Discription:[解码]</p>
* @param s
* @return
* @author:[许狄]
* @update:[日期YYYY-MM-DD] [更改人姓名][变更描述]
*/
public static String unescape(String s)
{
StringBuffer sbuf = new StringBuffer();
int i = 0;
int len = s.length();
while (i < len)
{
int ch = s.charAt(i);
if (ch == '+')
{ // + : map to ' '
sbuf.append(' ');
}
else if ('A' <= ch && ch <= 'Z')
{ // 'A'..'Z' : as it was
sbuf.append((char) ch);
}
else if ('a' <= ch && ch <= 'z')
{ // 'a'..'z' : as it was
sbuf.append((char) ch);
}
else if ('0' <= ch && ch <= '9')
{ // '0'..'9' : as it was
sbuf.append((char) ch);
}
else if (ch == '-' || ch == '_' // unreserved : as it was
|| ch == '.' || ch == '!' || ch == '~' || ch == '*'
|| ch == '/'' || ch == '(' || ch == ')')
{
sbuf.append((char) ch);
}
else if (ch == '%')
{
int cint = 0;
if ('u' != s.charAt(i + 1))
{ // %XX : map to ascii(XX)
cint = (cint << 4) | Escape.val[s.charAt(i + 1)];
cint = (cint << 4) | Escape.val[s.charAt(i + 2)];
i += 2;
}
else
{ // %uXXXX : map to unicode(XXXX)
cint = (cint << 4) | Escape.val[s.charAt(i + 2)];
cint = (cint << 4) | Escape.val[s.charAt(i + 3)];
cint = (cint << 4) | Escape.val[s.charAt(i + 4)];
cint = (cint << 4) | Escape.val[s.charAt(i + 5)];
i += 5;
}
sbuf.append((char) cint);
}
i++;
}
return sbuf.toString();
}

}