以太坊转账之java
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ETH账户之间的转账
public class EthUtil {
private static final String URL = “http://127.0.0.1:8545/”;
public static final String KEYSTOREPATH = “C:\Users\Administrator\AppData\Roaming\Ethereum\keystore”;
public static final String PASSWORD = “yx2018”;/**
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create eth wallet
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@throws CipherException
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@throws IOException
*/
public static String CreateWallet() throws CipherException, IOException {Bip39Wallet wallet = WalletUtils.generateBip39Wallet(PASSWORD, new File(KEYSTOREPATH));
String fileName = wallet.getFilename();
return getAddress(fileName);
}
public static String getAddress(String fileName) {
String walletAddress = "0x" + fileName.substring( fileName.lastIndexOf("-") + 1, fileName.lastIndexOf("-") + 41); return walletAddress;}
public static List IterateAllWallet(String path) {
ListfileList = new ArrayList (); File file = new File(path); File[] files = file.listFiles(); if (files == null) { return fileList; } for (File f : files) { if (f.isFile()) { fileList.add(f); } else if (f.isDirectory()) { System.out.println(f.getAbsolutePath()); IterateAllWallet(f.getAbsolutePath()); } } -
// for (File f:fileList){
// System.out.println(getAddress(f.getName()));
// }
return fileList;
}
public static File getFileFromAddress(String address) {
File file = new File(KEYSTOREPATH);
if (!file.isDirectory() || file.listFiles().length == 0) {
return null;
}
for (File f : file.listFiles()) {
String fileName = f.getName();
String walletAddress = "0x" + fileName.substring(fileName.lastIndexOf("-") + 1,
fileName.lastIndexOf("-") + 41);
if (address.equalsIgnoreCase(walletAddress)) {
return f;
}
}
return null;
}
/**
* 连接eth
*
* @return
*/
public static Web3j getConnection() {
Web3j web3 = Web3j.build(new HttpService(URL));
return web3;
}
/**
* 初始化admin级别操作的对象
*
* @return Admin
*/
public static Admin initAdmin() {
return Admin.build(getService());
}
/**
* 通过http连接到geth节点
*
* @return
*/
private static HttpService getService() {
return new HttpService(URL);
}
}
Web3j web3j = EthUtil.getConnection();
String txHash = ethService.tranferEth(web3j, fromAddr, toAddr, amount, gasPrice, gasLimit, walletPwd);
if (StringUtils.isEmpty(txHash)) {
throw new Exception(“转账失败”);
}
@Transactional(rollbackFor = Exception.class)
@Override
public String tranferEth(Web3j web3j, String from, String to, String amount, String gasPrice1, String gasLimit1, String walletPwd) throws Exception {
//查询交易费
BigInteger gasPrice = new BigInteger(gasPrice1);
BigInteger gasLimit = new BigInteger(gasLimit1);
BigInteger gas = gasPrice.multiply(gasLimit);
BigInteger value = new BigInteger(amount);
BigInteger allFee = value.add(gas);
String transactionHash;
//获取指定钱包的以太币余额
try {
BigInteger balance = web3j.ethGetBalance(from, DefaultBlockParameterName.LATEST).send().getBalance();
if (balance.compareTo(allFee) < 0) {
throw new Exception(“账户余额不足”);
}
//交易凭证
Credentials credentials = WalletUtils.loadCredentials(walletPwd, EthUtil.getFileFromAddress(from));
EthGetTransactionCount ethGetTransactionCount = web3j.ethGetTransactionCount(
from, DefaultBlockParameterName.LATEST).sendAsync().get();
BigInteger nonce = ethGetTransactionCount.getTransactionCount();
//普通交易
RawTransaction rawTransaction = RawTransaction.createEtherTransaction(
nonce, gasPrice, gasLimit, to, value);
byte[] signedMessage = TransactionEncoder.signMessage(rawTransaction, credentials);
String hexValue = Numeric.toHexString(signedMessage);
//发送交易
EthSendTransaction ethSendTransaction = web3j.ethSendRawTransaction(hexValue).sendAsync().get();
//交易的HASH
transactionHash = ethSendTransaction.getTransactionHash();
} catch (Exception e) {
throw new Exception("转账失败!");
}
return transactionHash;
}
2.指定地址转ETH至合约地址i
Result result = new Result();
Web3j web3j = EthUtil.getConnection();
String txHash = ethService.tranferToContractAddr(web3j, account, contractAddr, amount, gasPrice, gasLimit, walletPwd);
if (StringUtils.isEmpty(txHash)) {
throw new Exception(“转账失败”);
}
@Transactional(rollbackFor = Exception.class)
@Override
public String tranferToContractAddr(Web3j web3j, String from, String to, String value, String gasPrice, String gasLimit, String walletPwd) throws Exception {
BigInteger balance = web3j.ethGetBalance(from, DefaultBlockParameterName.LATEST).send().getBalance();
BigInteger gasPrice1 = new BigInteger(gasPrice);
BigInteger gasLimit1 = new BigInteger(gasLimit);
BigInteger gas = gasPrice1.multiply(gasLimit1);
// double temp = Math.pow(10, TokenOperate.DECIMAL);
BigInteger amount = new BigInteger(value);
BigInteger allFee = amount.add(gas);
//获取账户余额
// System.out.println(from + " balance :" + balance);
if (balance.compareTo(allFee) < 0) {
throw new Exception(“账户余额不足”);
}
//交易凭证
Credentials credentials = WalletUtils.loadCredentials(walletPwd, EthUtil.getFileFromAddress(from));
EthGetTransactionCount ethGetTransactionCount = web3j.ethGetTransactionCount(
from, DefaultBlockParameterName.LATEST).sendAsync().get();
BigInteger nonce = ethGetTransactionCount.getTransactionCount();
//创建交易 注意金额 保留小数点后8位 要转化为整数 比如0.00000001 转化为1
Function function = new Function(
"_transfer",//交易的方法名称
Arrays.asList(new Address(from), new Uint256(amount)),
Arrays.asList(new TypeReference() {
}, new TypeReference() {
})
);
String encodedFunction = FunctionEncoder.encode(function);
//智能合约交易
RawTransaction rawTransaction = RawTransaction.createTransaction(nonce, gasPrice1, gasLimit1, to, encodedFunction);
byte[] signedMessage = TransactionEncoder.signMessage(rawTransaction, credentials);
String hexValue = Numeric.toHexString(signedMessage);
//发送交易
EthSendTransaction ethSendTransaction = web3j.ethSendRawTransaction(hexValue).sendAsync().get();
//交易的HASH
String transactionHash = ethSendTransaction.getTransactionHash();
return transactionHash;
}