JAVA开发ETH钱包

package com.example.demo.eth;
 
 
import com.google.common.collect.ImmutableList;
import org.bitcoinj.crypto.*;
import org.bitcoinj.wallet.DeterministicSeed;
import org.web3j.abi.FunctionEncoder;
import org.web3j.abi.TypeReference;
import org.web3j.abi.datatypes.Function;
import org.web3j.abi.datatypes.Type;
import org.web3j.crypto.*;
import org.web3j.protocol.Web3j;
import org.web3j.protocol.core.DefaultBlockParameterName;
import org.web3j.protocol.http.HttpService;
import org.web3j.utils.Convert;
import org.web3j.utils.Numeric;
import sun.security.provider.SecureRandom;
 
import java.io.IOException;
import java.math.BigInteger;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.ExecutionException;

public class Wallet {

/**
 * path路径
 */
private final static ImmutableList BIP44_ETH_ACCOUNT_ZERO_PATH =
        ImmutableList.of(new ChildNumber(44, true), new ChildNumber(60, true),
                ChildNumber.ZERO_HARDENED, ChildNumber.ZERO);


/**
 * 连接web3 节点
 */
private final static Web3j web3j = Web3j.build(new HttpService("https://ropsten.infura.io"));


public static void main(String[] args) throws Exception {
    //创建钱包
    //createWallet();

    //ETH转账交易
    //signETHTransaction();

    //ETH代币转账交易
    signTokenTransaction();
}

/**
 * 创建钱包
 * @throws MnemonicException.MnemonicLengthException
 */
private static void createWallet()  throws MnemonicException.MnemonicLengthException {
    SecureRandom secureRandom = new SecureRandom();
    byte[] entropy = new byte[DeterministicSeed.DEFAULT_SEED_ENTROPY_BITS / 8];
    secureRandom.engineNextBytes(entropy);

    //生成12位助记词
    List  str = MnemonicCode.INSTANCE.toMnemonic(entropy);

    //使用助记词生成钱包种子
    byte[] seed = MnemonicCode.toSeed(str, "");
    DeterministicKey masterPrivateKey = HDKeyDerivation.createMasterPrivateKey(seed);
    DeterministicHierarchy deterministicHierarchy = new DeterministicHierarchy(masterPrivateKey);
    DeterministicKey deterministicKey = deterministicHierarchy
            .deriveChild(BIP44_ETH_ACCOUNT_ZERO_PATH, false, true, new ChildNumber(0));
    byte[] bytes = deterministicKey.getPrivKeyBytes();
    ECKeyPair keyPair = ECKeyPair.create(bytes);
    //通过公钥生成钱包地址
    String address = Keys.getAddress(keyPair.getPublicKey());

    System.out.println();
    System.out.println("助记词：");
    System.out.println(str);
    System.out.println();
    System.out.println("地址：");
    System.out.println("0x"+address);
    System.out.println();
    System.out.println("私钥：");
    System.out.println("0x"+keyPair.getPrivateKey().toString(16));
    System.out.println();
    System.out.println("公钥：");
    System.out.println(keyPair.getPublicKey().toString(16));
}

/**
 * ETH转账
 * @throws IOException
 * @throws ExecutionException
 * @throws InterruptedException
 */
public static void signETHTransaction() throws IOException, ExecutionException, InterruptedException {

    //发送方地址
    String from = "0x21985541C5e43b0eB3a343c7fbe8a609ce2CB24a";
    //转账数量
    String amount = "1";
    //接收者地址
    String to = "0xc290436b3da897115493a1547B52783c50f0Bef3";
    //发送方私钥
    String privateKey = "0x7c9df206b49522ce955d48b05a0689ed7a6cb4967b195eabea3a20f38cfcd27d";
    //查询地址交易编号
    BigInteger nonce = web3j.ethGetTransactionCount(from, DefaultBlockParameterName.PENDING).send().getTransactionCount();
    //支付的矿工费
    BigInteger gasPrice = web3j.ethGasPrice().send().getGasPrice();
    BigInteger gasLimit = new BigInteger("210000");

    BigInteger amountWei = Convert.toWei(amount, Convert.Unit.ETHER).toBigInteger();
    //签名交易
    RawTransaction rawTransaction = RawTransaction.createTransaction(nonce, gasPrice, gasLimit, to, amountWei, "");
    Credentials credentials = Credentials.create(privateKey);
    byte[] signMessage = TransactionEncoder.signMessage(rawTransaction, credentials);
    //广播交易
    String hash =  web3j.ethSendRawTransaction(Numeric.toHexString(signMessage)).sendAsync().get().getTransactionHash();

    System.out.println("hash:"+hash);

}

/**
 * ETH代币转账
 * @throws IOException
 * @throws ExecutionException
 * @throws InterruptedException
 */
public static void signTokenTransaction() throws IOException, ExecutionException, InterruptedException {

    //发送方地址
    String from = "0x21985541C5e43b0eB3a343c7fbe8a609ce2CB24a";
    //转账数量
    String amount = "1";
    //接收者地址
    String to = "0xc290436b3da897115493a1547B52783c50f0Bef3";
    //发送方私钥
    String privateKey = "0x7c9df206b49522ce955d48b05a0689ed7a6cb4967b195eabea3a20f38cfcd27d";
    //代币合约地址
    String coinAddress = "0x96a02A09EFcb1c0f9deEa33B01FFb991B77Db1eA";
    //查询地址交易编号
    BigInteger nonce = web3j.ethGetTransactionCount(from, DefaultBlockParameterName.PENDING).send().getTransactionCount();
    //支付的矿工费
    BigInteger gasPrice = web3j.ethGasPrice().send().getGasPrice();
    BigInteger gasLimit = new BigInteger("210000");

    Credentials credentials = Credentials.create(privateKey);
    BigInteger amountWei = Convert.toWei(amount, Convert.Unit.ETHER).toBigInteger();

    //封装转账交易
    Function function = new Function(
            "transfer",
            Arrays.asList(new org.web3j.abi.datatypes.Address(to),
                    new org.web3j.abi.datatypes.generated.Uint256(amountWei)),
            Collections.>emptyList());
    String data = FunctionEncoder.encode(function);
    //签名交易
    RawTransaction rawTransaction = RawTransaction.createTransaction(nonce, gasPrice, gasLimit, coinAddress, data);
    byte[] signMessage = TransactionEncoder.signMessage(rawTransaction, credentials);
    //广播交易
    String hash = web3j.ethSendRawTransaction(Numeric.toHexString(signMessage)).sendAsync().get().getTransactionHash();
    System.out.println("hash:"+hash);


  }
}