密码加密

public static final String MD5(String s) {
char ac[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a',
'b', 'c', 'd', 'e', 'f' };
try {
byte abyte0[] = s.getBytes();
MessageDigest messagedigest = MessageDigest.getInstance("MD5");
messagedigest.update(abyte0);
byte abyte1[] = messagedigest.digest();
int i = abyte1.length;
char ac1[] = new char[i * 2];
int j = 0;
for (int k = 0; k < i; k++) {
byte byte0 = abyte1[k];
ac1[j++] = ac[byte0 >>> 4 & 15];
ac1[j++] = ac[byte0 & 15];
}

return new String(ac1);
} catch (Exception exception) {
return null;
}
}

public static void main(String[] args){
System.out.println(MD5("111111"));
}