java MD5算法工具类

川长思鸟来 2021-06-24 15:57 320阅读 0赞

package com.zlxls.util;
    
    import java.security.MessageDigest;
    import java.security.NoSuchAlgorithmException;
    /**
     *
     * MD算法工具类
     * @ClassNmae：NewClass   
     * @author zlx-雄雄
     * @date    2017-8-16 11:42:41
     * 
     */
    public class MD5 {
        /**
         * @Description：全局数组
         */
        private final static String[] strDigits = { "0", "1", "2", "3", "4", "5","6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
    
        public MD5() {
        }
        /**
         * @Description：返回形式为数字跟字符串
         * @param bByte
         * @return 返回形式为数字跟字符串
         */
        private static String byteToArrayString(byte bByte) {
            int iRet = bByte;
            // System.out.println("iRet="+iRet);
            if (iRet < 0) {
                iRet += 256;
            }
            int iD1 = iRet / 16;
            int iD2 = iRet % 16;
            return strDigits[iD1] + strDigits[iD2];
        }
        /**
         * @Description：返回形式只为数字
         * @param bByte
         * @return 返回形式只为数字
         */
        private static String byteToNum(byte bByte) {
            int iRet = bByte;
            System.out.println("iRet1=" + iRet);
            if (iRet < 0) {
                iRet += 256;
            }
            return String.valueOf(iRet);
        }
        /**
         * @Description：转换字节数组为16进制字串
         * @param bByte
         * @return 
         */
        private static String byteToString(byte[] bByte) {
            StringBuilder sBuffer = new StringBuilder();
            for (int i = 0; i < bByte.length; i++) {
                sBuffer.append(byteToArrayString(bByte[i]));
            }
            return sBuffer.toString();
        }
        /**
         * @param strObj
         * @Description：获取MD5字符串
         * @return MD5字符串
         */
        public static String GetMD5Code(String strObj) {
            String resultString = null;
            try {
                resultString = strObj;
                MessageDigest md = MessageDigest.getInstance("MD5");
                // md.digest() 该函数返回值为存放哈希值结果的byte数组
                resultString = byteToString(md.digest(strObj.getBytes()));
            } catch (NoSuchAlgorithmException ex) {
            }
            return resultString;
        }
    }