java模拟js的escape和unescape函数

这个是在网上找的代码,然后修改了下.作用标题已经很明显了.

/**
 * java模拟js的escape和unescape函数.
 * 
 * 
 */
public class JSEscape {
	private 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 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,模拟js的escape函数.<br>
	 * escape不编码字符有69个：*+-./@_0-9a-zA-Z
	 * 
	 * @param s
	 *            字符串
	 * @return 转义后的字符串或者null
	 */
	public static String escape(String s) {
		if (s == null) {
			return null;
		}
		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') {
				sbuf.append((char) ch);
			} else if ('a' <= ch && ch <= 'z') {
				sbuf.append((char) ch);
			} else if ('0' <= ch && ch <= '9') {
				sbuf.append((char) ch);
			} else if (ch == '*' || ch == '+' || ch == '-' || ch == '/'
					|| ch == '_' || ch == '.' || ch == '@') {
				sbuf.append((char) ch);
			} else if (ch <= 0x007F) {
				sbuf.append('%');
				sbuf.append(hex[ch]);
			} else {
				sbuf.append('%');
				sbuf.append('u');
				sbuf.append(hex[(ch >>> 8)]);
				sbuf.append(hex[(0x00FF & ch)]);
			}
		}
		return sbuf.toString();
	}

	/**
	 * 解码,模拟js的unescape函数. 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) {
		if (s == null) {
			return null;
		}
		StringBuffer sbuf = new StringBuffer();
		int i = 0;
		int len = s.length();
		while (i < len) {
			int ch = s.charAt(i);
			if ('A' <= ch && ch <= 'Z') {
				sbuf.append((char) ch);
			} else if ('a' <= ch && ch <= 'z') {
				sbuf.append((char) ch);
			} else if ('0' <= ch && ch <= '9') {
				sbuf.append((char) ch);
			} else if (ch == '*' || ch == '+' || ch == '-' || ch == '/'
					|| ch == '_' || ch == '.' || ch == '@') {
				sbuf.append((char) ch);
			} else if (ch == '%') {
				int cint = 0;
				if ('u' != s.charAt(i + 1)) {
					cint = (cint << 4) | val[s.charAt(i + 1)];
					cint = (cint << 4) | val[s.charAt(i + 2)];
					i += 2;
				} else {
					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 {
				sbuf.append((char) ch);
			}
			i++;
		}
		return sbuf.toString();
	}

	public static void main(String[] args) {
		String stest = "1234 'abcd[]()<+>,.~";
		System.out.println(stest);
		System.out.println(escape(stest));
		System.out.println(unescape(escape(stest)));
		System.out
				.println(unescape("%7B%27id%27%3A1%2C%27parentId%27%3A2%2C%27name%27%3A%27%u6D4B%u8BD5%u6837%u4F8B%27%2C%27dataSource%27%3A%2720%27%2C%27path%27%3A%272/1.rep%27%7D"));
		System.out
				.println(escape("{'id':1,'parentId':2,'name':'测试样例','dataSource':'20','path':'2/1.rep'}"));
	}
}