import java.math.BigInteger; 
 import java.security.MessageDigest; 
 import java.security.NoSuchAlgorithmException; 
 public class MD5 { 
 //密码加密 与php加密一致 
 public static String md5(String input) throws NoSuchAlgorithmException { 
 String result = input; 
 if(input != null) { 
 MessageDigest md = MessageDigest.getInstance("MD5"); //or "SHA-1" 
 md.update(input.getBytes()); 
 BigInteger hash = new BigInteger(1, md.digest()); 
 result = hash.toString(16); 
 while(result.length() < 32) { //31位string 
 result = "0" + result; 
 } 
 } 
 return result; 
 } 
 }