个回答

• 小内存

  2016-04-24 01:20:00

  看着老师的敲就好了啊：

  private static String SHA1(String str) {

  if (str == null || str.length() == 0) {

  return null;

  }

  char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

  MessageDigest mdTemp;

  try {

  mdTemp = MessageDigest.getInstance("SHA1");

  mdTemp.update(str.getBytes("UTF-8"));

  byte[] md = mdTemp.digest();

  int j = md.length;

  char buf[] = new char[j * 2];

  int k = 0;

  for (int i = 0; i < j; i++) {

  byte b0 = md[i];

  buf[k++] = hexDigits[b0 >>> 4 & 0xf];

  buf[k++] = hexDigits[b0 & 0xf];

  }

  return new String(buf);

  } catch (Exception e) {

  return null;

  }

  }

  
  

  1