public class MD5Utils { public static void main(String[] args) throws Exception{ File file = new File("D:\msdia80.dll"); String md5 = MD5Utils.getMD5(new FileInputStream(file)); System.out.println(md5); } /** * 获取文件的MD5值 */ public static String getMD5(InputStream in) { MessageDigest digest = null; byte buffer[] = new byte[1024 * 1024]; int len; try { digest = MessageDigest.getInstance("MD5"); while ((len = in.read(buffer, 0, 1024 * 1024)) != -1) { digest.update(buffer, 0, len); } } catch (NoSuchAlgorithmException e) { e.printStackTrace(); throw new SunawException("获取文件的MD5错误"); } catch (IOException e) { e.printStackTrace(); throw new SunawException("获取文件的MD5错误"); } BigInteger bigInt = new BigInteger(1, digest.digest()); return bigInt.toString(16); } }