Java__MD5加密方法

老师给发的MD5加密类，不知是哪位大侠写的，在此存一下

 

/** * <p>Title: </p> * <p>Description: </p> * <p>Copyright: Copyright (c) 2003</p> * <p>Company: </p> * @author unascribed * @version 1.0 */ import java.security.MessageDigest; public class MD5 { private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"}; /** * 转换字节数组为16进制字串 * @param b 字节数组 * @return 16进制字串 */ public static String byteArrayToHexString(byte[] b) { StringBuffer resultSb = new StringBuffer(); for (int i = 0; i < b.length; i++) { resultSb.append(byteToHexString(b[i])); } return resultSb.toString(); } private static String byteToHexString(byte b) { int n = b; if (n < 0) n = 256 + n; int d1 = n / 16; int d2 = n % 16; return hexDigits[d1] + hexDigits[d2]; } public static String MD5Encode(String origin) { String resultString = null; try { resultString=new String(origin); MessageDigest md = MessageDigest.getInstance("MD5"); resultString=byteArrayToHexString(md.digest(resultString.getBytes())); } catch (Exception ex) { } return resultString; } public static void main(String[] args){ System.out.println(MD5.MD5Encode("123")); } }