标准MD5加密算法:

public class Md5 {    public static String getMd5(String s) {        char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',                'a', 'b', 'c', 'd', 'e', 'f' };        try {            byte[] strTemp = s.getBytes();            MessageDigest mdTemp = MessageDigest.getInstance("md5");            mdTemp.update(strTemp);            byte[] md = mdTemp.digest();            int j = md.length;            char str[] = new char[j * 2];            int k = 0;            for (int i = 0; i < j; i++) {                byte byte0 = md[i];                str[k++] = hexDigits[byte0 >>> 4 & 0xf];                str[k++] = hexDigits[byte0 & 0xf];            }            return new String(str);        } catch (Exception e) {            return null;        }    }    /**     * 标准MD5加密     *      * @param inStr     * @return     * @throws Exception     */    public static String toMD5(String inStr) {        StringBuffer sb = new StringBuffer();        try {            MessageDigest md = MessageDigest.getInstance("MD5");            md.update(inStr.getBytes());            byte b[] = md.digest();            int i;            for (int offset = 0; offset < b.length; offset++) {                i = b[offset];                if (i < 0)                    i += 256;                if (i < 16)                    sb.append("0");                sb.append(Integer.toHexString(i));            }        } catch (Exception e) {            return null;            // e.printStackTrace();        }        return sb.toString().toUpperCase();    }    public static void main(String[] args) throws Exception {        System.out.println(toMD5("MATICSOFT").toUpperCase());        System.out.println(getMd5("MATICSOFT").toUpperCase());    }}