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 };

        /**
        * 编码
        *
        * @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();
        }

        /**
        * 解码 说明：本方法保证 不论参数s是否经过escape()编码，均能得到正确的“解码”结果
        *
        * @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 { // 对应的字符未经过编码
        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)));
        }

        }