Escape加解密Java版

旧城等待， 2022-06-13 11:13 223阅读 0赞

/**
     * 中文加密
     * Created by geo on 2017/7/4.
     */
    public class EscapeUtils {
    
        /**
         * Escape编码
         * @param src 待加盐字符串
         * @return 加盐字符串
         */
        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();
        }
    
        /**
         * Escape解码
         * @param src 加盐字符串
         * @return 明文
         */
        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();
        }
    }