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"); } }