erc20 转账问题

 //转账 public void sendTx(String fromPrivateKey,String toAddress) throws IOException, ExecutionException, InterruptedException { String cOntractAddress= "0xdac17f958d2ee523a2206206994597c13d831ec7"; ECKeyPair ecKeyPair = ECKeyPair.create(new BigInteger(fromPrivateKey, 16)); String from = "0x"+Keys.getAddress(ecKeyPair.getPublicKey()); log.info("from:\t\t{}",from); log.info(" to:\t\t{}",toAddress); BigDecimal amount = new BigDecimal("1"); BigInteger amountBigInteger = Convert.toWei(amount, Convert.Unit.MWEI).toBigInteger(); EthGetTransactionCount ethGetTransactiOnCount= web3j.ethGetTransactionCount( from, DefaultBlockParameterName.LATEST).sendAsync().get(); BigInteger nOnce= ethGetTransactionCount.getTransactionCount(); //离线签名 代币 Credentials credentials = Credentials.create(ecKeyPair); byte[] signedMessage; Function function = new Function( "transfer", Arrays.asList(new Address(toAddress), new Uint256(amountBigInteger)), Arrays.asList(new TypeReference<Type>(){}) ); String data = FunctionEncoder.encode(function); RawTransaction rawTransaction = RawTransaction.createTransaction(nonce, Convert.toWei("38", Convert.Unit.GWEI).toBigInteger(), Convert.toWei("30000", Convert.Unit.WEI).toBigInteger(), contractAddress, data); signedMessage = TransactionEncoder.signMessage(rawTransaction, credentials); String hexValue = Numeric.toHexString(signedMessage); log.info("signedData : " + hexValue); //广播 EthSendTransaction send = web3j.ethSendRawTransaction(hexValue).send(); ... }