bitcoinj项目富含完整demo 此项目使用maven构建,不会使用maven的同学,查看项目pom.xml文件,并在http://mvnrepository.com/下载相应的依赖jar包. demo:bitcoinj签名交易 /** * @param unSpentBTCList 未花费utxo集合 * @param from 发送者地址 * @param to 接收者地址 * @param privateKey 私钥 * @param value 发送金额.单位:聪 * @param fee 旷工费.单位:聪 * @return 签名之后未广播的原生交易字符串 * @throws Exception */ public static String signBTCTransactionData(List unSpentBTCList, String from, String to, String privateKey, long value, long fee) throws Exception { NetworkParameters networkParameters = null; // networkParameters = MainNetParams.get(); //测试网络 networkParameters = TestNet3Params.get(); Transaction transaction = new Transaction(networkParameters); DumpedPrivateKey dumpedPrivateKey = DumpedPrivateKey.fromBase58(networkParameters, privateKey); ECKey ecKey = dumpedPrivateKey.getKey(); long totalMoney = 0; List utxos = new ArrayList(); //遍历未花费列表，组装合适的item for (UnSpentBTC us : unSpentBTCList) { if (totalMoney >= (value + fee)) break; UTXO utxo = new UTXO(Sha256Hash.wrap(us.getTxid()), us.getVout(), Coin.valueOf(us.getSatoshis()), us.getHeight(), false, new Script(Hex.decode(us.getScriptPubKey()))); utxos.add(utxo); totalMoney += us.getSatoshis(); } transaction.addOutput(Coin.valueOf(value), Address.fromBase58(networkParameters, to)); // transaction. //消费列表总金额 - 已经转账的金额 - 手续费 就等于需要返回给自己的金额了 long balance = totalMoney - value - fee; //输出-转给自己 if (balance > 0) { transaction.addOutput(Coin.valueOf(balance), Address.fromBase58(networkParameters, from)); } //输入未消费列表项 for (UTXO utxo : utxos) { TransactionOutPoint outPoint = new TransactionOutPoint(networkParameters, utxo.getIndex(), utxo.getHash());