import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;public class Md5 {  public static String getMD5(String val) throws NoSuchAlgorithmException{     MessageDigest md5 = MessageDigest.getInstance("MD5");     md5.update(val.getBytes());     byte[] m = md5.digest();//加密      return getString(m);   }   private static String getString(byte[] b){     StringBuffer buf = new StringBuffer();      for(int i = 0; i < b.length; i ++){     	 int a = b[i];	     if(a<0)	    	 a+=256;	     if(a<16)	    	 buf.append("0");	     buf.append(Integer.toHexString(a));          } 		     return buf.toString(); //32位	或者 return buf.toString().substring(8,24)；  //16位