一、前言
通过后端java代码实现javascript脚本escape编码（加密）和unescape解码（解密）的可逆过程实现代码示例（js伪码编码），详情参见如下。
二、代码示例
public class JSescape {@b@@b@ private final static String[] hex = { "00", "01", "02", "03", "04", "05", @b@ "06", "07", "08", "09", "0A", "0B", "0C", "0D", "0E", "0F", "10", @b@ "11", "12", "13", "14", "15", "16", "17", "18", "19", "1A", "1B", @b@ "1C", "1D", "1E", "1F", "20", "21", "22", "23", "24", "25", "26", @b@ "27", "28", "29", "2A", "2B", "2C", "2D", "2E", "2F", "30", "31", @b@ "32", "33", "34", "35", "36", "37", "38", "39", "3A", "3B", "3C", @b@ "3D", "3E", "3F", "40", "41", "42", "43", "44", "45", "46", "47", @b@ "48", "49", "4A", "4B", "4C", "4D", "4E", "4F", "50", "51", "52", @b@ "53", "54", "55", "56", "57", "58", "59", "5A", "5B", "5C", "5D", @b@ "5E", "5F", "60", "61", "62", "63", "64", "65", "66", "67", "68", @b@ "69", "6A", "6B", "6C", "6D", "6E", "6F", "70", "71", "72", "73", @b@ "74", "75", "76", "77", "78", "79", "7A", "7B", "7C", "7D", "7E", @b@ "7F", "80", "81", "82", "83", "84", "85", "86", "87", "88", "89", @b@ "8A", "8B", "8C", "8D", "8E", "8F", "90", "91", "92", "93", "94", @b@ "95", "96", "97", "98", "99", "9A", "9B", "9C", "9D", "9E", "9F", @b@ "A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7", "A8", "A9", "AA", @b@ "AB", "AC", "AD", "AE", "AF", "B0", "B1", "B2", "B3", "B4", "B5", @b@ "B6", "B7", "B8", "B9", "BA", "BB", "BC", "BD", "BE", "BF", "C0", @b@ "C1", "C2", "C3", "C4", "C5", "C6", "C7", "C8", "C9", "CA", "CB", @b@ "CC", "CD", "CE", "CF", "D0", "D1", "D2", "D3", "D4", "D5", "D6", @b@ "D7", "D8", "D9", "DA", "DB", "DC", "DD", "DE", "DF", "E0", "E1", @b@ "E2", "E3", "E4", "E5", "E6", "E7", "E8", "E9", "EA", "EB", "EC", @b@ "ED", "EE", "EF", "F0", "F1", "F2", "F3", "F4", "F5", "F6", "F7", @b@ "F8", "F9", "FA", "FB", "FC", "FD", "FE", "FF" }; @b@ @b@ private final static byte[] val = { 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x00, 0x01, @b@ 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, @b@ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F }; @b@ @b@ /** @b@ * 编码 @b@ * @param s @b@ * @return @b@ */ @b@ public static String escape(String s) { @b@ StringBuffer sbuf = new StringBuffer(); @b@ int len = s.length(); @b@ for (int i = 0; i < len; i++) { @b@ int ch = s.charAt(i); @b@ if ('A' <= ch && ch <= 'Z') { @b@ sbuf.append((char) ch); @b@ } else if ('a' <= ch && ch <= 'z') { @b@ sbuf.append((char) ch); @b@ } else if ('0' <= ch && ch <= '9') { @b@ sbuf.append((char) ch); @b@ } else if (ch == '-' || ch == '_' @b@ || ch == '.' || ch == '!' || ch == '~' || ch == '*' @b@ || ch == '\'' || ch == '(' || ch == ')') { @b@ sbuf.append((char) ch); @b@ } else if (ch <= 0x007F) { @b@ sbuf.append('%'); @b@ sbuf.append(hex[ch]); @b@ } else { @b@ sbuf.append('%'); @b@ sbuf.append('u'); @b@ sbuf.append(hex[(ch >>> 8)]); @b@ sbuf.append(hex[(0x00FF & ch)]); @b@ } @b@ } @b@ return sbuf.toString(); @b@ } @b@ @b@ /** @b@ * 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 @b@ * @param s @b@ * @return @b@ */ @b@ public static String unescape(String s) { @b@ StringBuffer sbuf = new StringBuffer(); @b@ int i = 0; @b@ int len = s.length(); @b@ while (i < len) { @b@ int ch = s.charAt(i); @b@ if ('A' <= ch && ch <= 'Z') { @b@ sbuf.append((char) ch); @b@ } else if ('a' <= ch && ch <= 'z') { @b@ sbuf.append((char) ch); @b@ } else if ('0' <= ch && ch <= '9') { @b@ sbuf.append((char) ch); @b@ } else if (ch == '-' || ch == '_'|| ch == '.' || ch == '!' || ch == '~' || ch == '*'|| ch == '\'' || ch == '(' || ch == ')') { @b@ sbuf.append((char) ch); @b@ } else if (ch == '%') { @b@ int cint = 0; @b@ if ('u' != s.charAt(i + 1)) { @b@ cint = (cint << 4) | val[s.charAt(i + 1)]; @b@ cint = (cint << 4) | val[s.charAt(i + 2)]; @b@ i += 2; @b@ } else { @b@ cint = (cint << 4) | val[s.charAt(i + 2)]; @b@ cint = (cint << 4) | val[s.charAt(i + 3)]; @b@ cint = (cint << 4) | val[s.charAt(i + 4)]; @b@ cint = (cint << 4) | val[s.charAt(i + 5)]; @b@ i += 5; @b@ } @b@ sbuf.append((char) cint); @b@ } else { @b@ sbuf.append((char) ch); @b@ } @b@ i++; @b@ } @b@ return sbuf.toString(); @b@ } @b@}