ETH原生交易构建,可手动设置手续费

ETH原生交易构建,可手动设置手续费

第一种交易方式(无法设置手续费)

这种方式比较简单,不需要一大堆杂七杂八的参数,直接通过私钥完成即可:

/**
     * 以太坊交易
     *
     * @param fromAddress 转账地址
     * @param password    密码 userId
     * @param toAddress   收款方地址
     * @param amount      转账金额,单位:eth
     * @return 交易哈希
     * @throws Exception
     */
    public static String tx(String fromAddress, String password, String toAddress, BigDecimal amount) throws Exception {
        Web3j web3j = Web3j.build(new HttpService("https://mainnet.infura.io/v3/df37be688d544933a573b47c1f0ea159"));
        String privateKey = EthService.exportPrivateKey(password, fromAddress);
        Credentials credentials = Credentials.create(privateKey);
        TransactionReceipt transactionReceipt = Transfer.sendFunds(web3j, credentials, toAddress, amount, Convert.Unit.ETHER).send();
        return transactionReceipt.getTransactionHash();
    }

//获取私钥  keystorePath是keystore文件所在路径
public static String exportPrivateKey(String password, String keystorePath) throws Exception {
        Credentials credentials = WalletUtils.loadCredentials(password, keystorePath);
        BigInteger privateKey = credentials.getEcKeyPair().getPrivateKey();
        return privateKey.toString(16);
    }

第二种交易方式(可以设置手续费)

第二种方式,通过私钥签名的方式完成交易。需要进行手动获取nonce,手动设置手续费等操作,相对第一种方式麻烦一些,但是执行速度更快,效率更高。第一种转账方式的本质,其实和第二种转账方式是一样的,只不过是在底层帮我们把这些操作封装好了。

   /**
     * 构建eth原始交易
     *
     * @return 交易hash
     */
    private String transaction(String fromAddress, String password, String toAddress, BigDecimal amount) throws Exception {
        Web3j web3j = Web3j.build(new HttpService("https://mainnet.infura.io/v3/df37be688d544933a573b47c1f0ea159"));
        BigInteger nonce;
        EthGetTransactionCount ethGetTransactionCount = web3j.ethGetTransactionCount(fromAddress, DefaultBlockParameterName.PENDING).send();
        if (ethGetTransactionCount == null) {
            return null;
        }
        nonce = ethGetTransactionCount.getTransactionCount();
        //设置手续费 矿工可接受范围之内
        BigInteger gasPrice = Convert.toWei(new BigDecimal(PropertiesUtil.getProperty("eth.gasPrice", "3")),
                Convert.Unit.GWEI).toBigInteger();
        BigInteger gasLimit = new BigInteger(PropertiesUtil.getProperty("eth.gasLimit", "21000"));
        toAddress = toAddress.toLowerCase();
        BigInteger value = Convert.toWei(amount, Convert.Unit.ETHER).toBigInteger();
        String data = "";
        byte chainId = ChainId.MAINNET; //主网id
        //获取私钥进行交易签名
        String privateKey = EthService.exportPrivateKey(password, fromAddress);
        if (org.apache.commons.lang3.StringUtils.isBlank(privateKey)) {
            return null;
        }
        String signedData = signTransaction(nonce, gasPrice, gasLimit, toAddress, value, data, chainId, privateKey);
        if (signedData != null) {
            EthSendTransaction ethSendTransaction = web3j.ethSendRawTransaction(signedData).send();
            String hash = ethSendTransaction.getTransactionHash();
            if (hash != null) {
                logger.info("eth交易成功,hash={}", hash);
                return hash;
            }
        }
        return null;
    }

   /**
     * eth交易签名
     *
     * @return 签名信息
     */
    private String signTransaction(BigInteger nonce, BigInteger gasPrice, BigInteger gasLimit, String to,
                                   BigInteger value, String data, byte chainId, String privateKey) {
        byte[] signedMessage;
        RawTransaction rawTransaction = RawTransaction.createTransaction(nonce, gasPrice, gasLimit, to, value, data);
        if (privateKey.startsWith("0x")) {
            privateKey = privateKey.substring(2);
        }
        ECKeyPair ecKeyPair = ECKeyPair.create(new BigInteger(privateKey, 16));
        Credentials credentials = Credentials.create(ecKeyPair);
        if (chainId > ChainId.NONE) {
            signedMessage = TransactionEncoder.signMessage(rawTransaction, chainId, credentials);
        } else {
            signedMessage = TransactionEncoder.signMessage(rawTransaction, credentials);
        }
        String hexValue = Numeric.toHexString(signedMessage);
        logger.info("eth交易签名信息={}", hexValue);
        return hexValue;
    }
  • 说明:手续费 = gasUsed * gasPrice
    如果想要手动设置手续费,gasLimit一定要写死21000,这是最低值,设置成了21000意味着每次gasUsed都是21000,不会改变。所以只需要修改gasPrice就相当于设置了手续费。

以上代码复制过去就可以直接使用啦,如果对你有帮助,就点个赞吧 ^ . ^

说明:此处是通过调用infura的节点进行操作的,token可自行去官网免费获取,两种方式本地测试均没有问题。也可以自己同步eth区块,搭建rpc节点进行调用。这样就没有使用限制啦!

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