下面的代码实现了MD5值的生成:
public class MD5Test2 { public static void main(String[] args) { System.out.println(MD5Test2.MD5Operation("hello")); System.out.println(MD5Test2.getMD5("hello")); } //通过java.math包的BigInteger类实现十六进制的转换 public final static String MD5Operation(String s){ try { byte strTemp[] = s.getBytes(); MessageDigest md = MessageDigest.getInstance("MD5"); md.update(strTemp); byte b[] = md.digest(); BigInteger bigInt = new BigInteger(1, b); return bigInt.toString(16); } catch (NoSuchAlgorithmException e) { return null; } } //利用java底层代码实现十六进制的转换 public final 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 md = MessageDigest.getInstance("MD5"); md.update(strTemp); byte b[] = md.digest(); int len = b.length; char str[] = new char[len*2]; int k=0; for(int i=0; i<len; i++){ str[k++] = hexDigits[b[i] >>> 4 & 0xf]; str[k++] = hexDigits[b[i] & 0xf]; } return new String(str); } catch (NoSuchAlgorithmException e) { return null; } } }
原文地址:http://www.cnblogs.com/weilunhui/p/3843939.html