Java 实现MD5加密

import java.security.MessageDigest;/** * MD5加密类 *  */public class MD5Encoding{/** *  *  */private MD5Encoding(){}/** * 加密算法MD5 *  * @param text *            明文 * @return String 密文 */public final static String encoding(String text){char hexDigits[] ={ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd','e', 'f' };String encodingStr = null;try{byte[] strTemp = text.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];}encodingStr = new String(str);}catch (Exception e){}return encodingStr;}public static void main(String[] areg){MD5Encoding md5 = new MD5Encoding();md5.encoding("admin");}}