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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 };

??????? /**
??????? * 編碼
??????? *
??????? * @param s
??????? * @return
??????? */
??????? 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 ('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();
??????? }

??????? /**
??????? * 解碼 說明：本方法保證 不論參數s是否經過escape()編碼，均能得到正確的“解碼”結果
??????? *
??????? * @param s
??????? * @return
??????? */
??????? 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 ('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) | val[s.charAt(i + 1)];
??????? cint = (cint << 4) | val[s.charAt(i + 2)];
??????? i += 2;
??????? } else { // %uXXXX : map to unicode(XXXX)
??????? cint = (cint << 4) | val[s.charAt(i + 2)];
??????? cint = (cint << 4) | val[s.charAt(i + 3)];
??????? cint = (cint << 4) | val[s.charAt(i + 4)];
??????? cint = (cint << 4) | val[s.charAt(i + 5)];
??????? i += 5;
??????? }
??????? sbuf.append((char) cint);
??????? } else { // 對應的字符未經過編碼
??????? sbuf.append((char) ch);
??????? }
??????? i++;
??????? }
??????? return sbuf.toString();
??????? }

??????? public static void main(String[] args) {
??????? String stest = "中文1234 abcd[]()<+>,.~\\";
??????? System.out.println(stest);
??????? System.out.println(escape(stest));
??????? System.out.println(unescape(escape(stest)));
??????? }

??????? }

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