python and java encrypt with AES, but the result are not same -

java code:

public string encrypt (string str,string key) throws encryptexception {      try{         javax.crypto.spec.secretkeyspec keyspec = new javax.crypto.spec.secretkeyspec(key.getbytes(), "aes");         javax.crypto.cipher c = javax.crypto.cipher.getinstance("aes");         c.init(javax.crypto.cipher.encrypt_mode, keyspec);         byte[] src = str.getbytes("utf-8");         byte[] encrypt = c.dofinal(src);         return new sun.misc.base64encoder().encode(encrypt).replaceall("\r|\n", "");     }catch(exception e){         throw new encryptexception("encrypt failed.",e);     } } 

python code:

def get_enctypted(self, param_req):     bs = aes.block_size     pad = lambda s: s + (bs - len(s) % bs) * chr(bs - len(s) % bs)     param_json = json.dumps(param_req)     iv = random.new().read(aes.block_size)     cipher = aes.new(self.get_key(), aes.mode_ecb, iv)     encrypted = cipher.encrypt(pad(param_json))     encrypted_base64 = base64.b64encode(iv + encrypted)     return encrypted_base64 

when run code same key , string, 2 different result, know why?

take @ line - iv = random.new().read(aes.block_size). use random value, of course results can't same.