【开发笔记】Java和.Net实现JS中的escape()和unescape()

在做建行支付对接时，传的参数中的汉字，需要用escape()编码

但我是通过Java和.Net后台直接请求，因此需要在后台实现类似的功能

所以在此贴上代码

Java

    /**
     * 汉字编码，实现js escape(）
     *
     * @param src
     * @return
     */
    public static String escape(String src) {
        int i;
        char j;
        StringBuffer tmp = new StringBuffer();
        tmp.ensureCapacity(src.length() * 6);
        for (i = 0; i < src.length(); i++) {
            j = src.charAt(i);
            if (Character.isDigit(j) || Character.isLowerCase(j)
                    || Character.isUpperCase(j))
                tmp.append(j);
            else if (j < 256) {
                tmp.append("%");
                if (j < 16)
                    tmp.append("0");
                tmp.append(Integer.toString(j, 16));
            } else {
                tmp.append("%u");
                tmp.append(Integer.toString(j, 16));
            }
        }
        return tmp.toString();
    }

    /**
     * 汉字解码 实现js unescap()
     *
     * @param src
     * @return
     */
    public static String unescape(String src) {
        StringBuffer tmp = new StringBuffer();
        tmp.ensureCapacity(src.length());
        int lastPos = 0, pos = 0;
        char ch;
        while (lastPos < src.length()) {
            pos = src.indexOf("%", lastPos);
            if (pos == lastPos) {
                if (src.charAt(pos + 1) == 'u') {
                    ch = (char) Integer.parseInt(src
                            .substring(pos + 2, pos + 6), 16);
                    tmp.append(ch);
                    lastPos = pos + 6;
                } else {
                    ch = (char) Integer.parseInt(src
                            .substring(pos + 1, pos + 3), 16);
                    tmp.append(ch);
                    lastPos = pos + 3;
                }
            } else {
                if (pos == -1) {
                    tmp.append(src.substring(lastPos));
                    lastPos = src.length();
                } else {
                    tmp.append(src.substring(lastPos, pos));
                    lastPos = pos;
                }
            }
        }
        return tmp.toString();
    }

.Net

        /// 

        /// escape加密
        /// 
        /// 
        public string Escape(string s)
        {
            StringBuilder sb = new StringBuilder();
            byte[] byteArr = System.Text.Encoding.Unicode.GetBytes(s);

            for (int i = 0; i < byteArr.Length; i += 2)
            {
                sb.Append("%u");
                sb.Append(byteArr[i + 1].ToString("X2"));//把字节转换为十六进制的字符串表现形式

                sb.Append(byteArr[i].ToString("X2"));
            }
            return sb.ToString();
        }

        /// 

        /// unescape解密
        /// 
        /// 
        private string unescape(string s)
        {

            string str = s.Remove(0, 2);//删除最前面两个＂%u＂
            string[] strArr = str.Split(new string[] { "%u" }, StringSplitOptions.None);//以子字符串＂%u＂分隔
            byte[] byteArr = new byte[strArr.Length * 2];
            for (int i = 0, j = 0; i < strArr.Length; i++, j += 2)
            {
                byteArr[j + 1] = Convert.ToByte(strArr[i].Substring(0, 2), 16);  //把十六进制形式的字串符串转换为二进制字节
                byteArr[j] = Convert.ToByte(strArr[i].Substring(2, 2), 16);
            }
            str = System.Text.Encoding.Unicode.GetString(byteArr); //把字节转为unicode编码
            return str;

        }