Java使用Web3j进行eth和token转账

ETH转账

public static void transfer() throws Exception {
    Web3j web3j = Web3j.build(new HttpService("infura节点链接"));
    BigInteger bigInteger = new BigInteger("钱包私钥", 16);
    ECKeyPair ecKeyPair = ECKeyPair.create(bigInteger);
    Credentials credentials = Credentials.create(ecKeyPair);
    TransactionReceipt transactionReceipt = Transfer.sendFunds(web3j, credentials, "目标地址", BigDecimal.valueOf(0.001), Convert.Unit.ETHER).send();
    System.out.println(transactionReceipt);
}

Token转账

public static void transferToken() throws Exception {
    Web3j web3j = Web3j.build(new HttpService("infura节点链接"));
    BigInteger bigInteger = new BigInteger("私钥", 16);
    ECKeyPair ecKeyPair = ECKeyPair.create(bigInteger);
    Credentials credentials = Credentials.create(ecKeyPair);
    String fromAddress = credentials.getAddress();
    EthGetTransactionCount ethGetTransactionCount = web3j.ethGetTransactionCount(
            fromAddress, DefaultBlockParameterName.LATEST).sendAsync().get();
    BigInteger nonce = ethGetTransactionCount.getTransactionCount();

    Address address = new Address("目标地址");
    Uint256 value = new Uint256(new BigInteger("数量 单位wei"));
    List<Type> parametersList = new ArrayList<>();
    parametersList.add(address);
    parametersList.add(value);
    List<TypeReference<?>> outList = new ArrayList<>();
    Function function = new Function("transfer", parametersList, outList);
    String encodedFunction = FunctionEncoder.encode(function);
    System.out.println( DefaultGasProvider.GAS_PRICE);
    System.out.println(DefaultGasProvider.GAS_LIMIT);
    RawTransaction rawTransaction = RawTransaction.createTransaction(nonce,  DefaultGasProvider.GAS_PRICE,
            new BigInteger("210000"), "合约地址", encodedFunction);
    byte[] signedMessage = TransactionEncoder.signMessage(rawTransaction, credentials);
    String hexValue = Numeric.toHexString(signedMessage);
    EthSendTransaction ethSendTransaction = web3j.ethSendRawTransaction(hexValue).sendAsync().get();
    Object transactionHash = ethSendTransaction.getTransactionHash();
    System.out.println(transactionHash.toString());
}