/**

* 将字符串转成16 位MD5值

* 

* @param string

* @return

*/

public static String MD5(String string) {

byte[] hash;

try {

hash = MessageDigest.getInstance("MD5").digest(

string.getBytes("UTF-8"));

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

return null;

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

return null;

}

StringBuilder hex = new StringBuilder(hash.length * 2);

for (byte b : hash) {

if ((b & 0xFF) < 0x10)

hex.append("0");

hex.append(Integer.toHexString(b & 0xFF));

}

return hex.toString();// 32位

return hex.toString().toString().substring(8, 24);// 16位

}