這篇文章主要講解了“怎么用java實(shí)現(xiàn)簡(jiǎn)單比特幣功能”,文中的講解內(nèi)容簡(jiǎn)單清晰,易于學(xué)習(xí)與理解,下面請(qǐng)大家跟著小編的思路慢慢深入,一起來(lái)研究和學(xué)習(xí)“怎么用java實(shí)現(xiàn)簡(jiǎn)單比特幣功能”吧!
一、塊定義
/**
* 區(qū)塊結(jié)構(gòu)
* @author
*/
public class Block {
/**
* 區(qū)塊索引號(hào)
*/
private int index;
/**
* 當(dāng)前區(qū)塊的hash值,區(qū)塊唯一標(biāo)識(shí)
*/
private String hash;
/**
* 生成區(qū)塊的時(shí)間戳
*/
private long timestamp;
/**
* 當(dāng)前區(qū)塊的交易集合
*/
private List<Transaction> transactions;
/**
* 工作量證明,計(jì)算正確hash值的次數(shù)
*/
private int nonce;
/**
* 前一個(gè)區(qū)塊的hash值
*/
private String previousHash;
public Block() {
super();
}
public Block(int index, long timestamp, List<Transaction> transactions, int nonce, String previousHash, String hash) {
super();
this.index = index;
this.timestamp = timestamp;
this.transactions = transactions;
this.nonce = nonce;
this.previousHash = previousHash;
this.hash = hash;
}
}
二、交易定義
/**
* 交易
* @author
*/
public class Transaction {
/**
* 交易唯一標(biāo)識(shí)
*/
private String id;
/**
* 交易發(fā)送方錢包地址
*/
private String sender;
/**
* 交易接收方錢包地址
*/
private String recipient;
/**
* 交易金額
*/
private int amount;
public Transaction() {
super();
}
public Transaction(String id, String sender, String recipient, int amount) {
super();
this.id = id;
this.sender = sender;
this.recipient = recipient;
this.amount = amount;
}
}
三、挖礦方法
/**
* 挖礦
* @param blockchain 整個(gè)區(qū)塊鏈
* @param txs 需記賬交易記錄
* @param address 礦工錢包地址
* @return
*/
private static void mineBlock(List<Block> blockchain, List<Transaction> txs, String address) {
//加入系統(tǒng)獎(jiǎng)勵(lì)的交易,默認(rèn)挖礦獎(jiǎng)勵(lì)10個(gè)比特幣
Transaction sysTx = new Transaction(CryptoUtil.UUID(), "", address, 10);
txs.add(sysTx);
//獲取當(dāng)前區(qū)塊鏈里的最后一個(gè)區(qū)塊
Block latestBlock = blockchain.get(blockchain.size() - 1);
//隨機(jī)數(shù)
int nonce = 1;
String hash = "";
while(true){
hash = CryptoUtil.SHA256(latestBlock.getHash() + JSON.toJSONString(txs) + nonce);
if (hash.startsWith("0000000000")) {
System.out.println("=====計(jì)算結(jié)果正確,計(jì)算次數(shù)為:" +nonce+ ",hash:" + hash);
break;
}
nonce++;
System.out.println("計(jì)算錯(cuò)誤,hash:" + hash);
}
//解出難題,可以構(gòu)造新區(qū)塊并加入進(jìn)區(qū)塊鏈里
Block newBlock = new Block(latestBlock.getIndex() + 1, System.currentTimeMillis(), txs, nonce, latestBlock.getHash(), hash);
blockchain.add(newBlock);
System.out.println("挖礦后的區(qū)塊鏈:" + JSON.toJSONString(blockchain));
}
四、余額計(jì)算
/**
* 查詢余額
* @param blockchain
* @param address
* @return
*/
public static int getWalletBalance(List<Block> blockchain, String address) {
int balance = 0;
for (Block block : blockchain) {
List<Transaction> transactions = block.getTransactions();
for (Transaction transaction : transactions) {
if (address.equals(transaction.getRecipient())) {
balance += transaction.getAmount();
}
if (address.equals(transaction.getSender())) {
balance -= transaction.getAmount();
}
}
}
return balance;
五、運(yùn)行范例
public static void main(String[] args) {
//創(chuàng)建一個(gè)空的區(qū)塊鏈
List<Block> blockchain = new ArrayList<>();
//生成創(chuàng)世區(qū)塊
Block block = new Block(1, System.currentTimeMillis(), new ArrayList<Transaction>(), 1, "1", "1");
//加入創(chuàng)世區(qū)塊到區(qū)塊鏈里
blockchain.add(block);
System.out.println(JSON.toJSONString(blockchain));
// 發(fā)送方錢包地址
String sender = "sender_wallet";
//接收方錢包地址
String recipient = "recipient_wallet";
//創(chuàng)建一個(gè)空的交易集合
List<Transaction> txs = new ArrayList<>();
//挖礦
mineBlock(blockchain, txs, sender);
System.out.println(sender + "錢包的余額為:" + getWalletBalance(blockchain, sender));
//創(chuàng)建一個(gè)空的交易集合
List<Transaction> txs1 = new ArrayList<>();
//已發(fā)生但未記賬的交易記錄,發(fā)送者給接收者轉(zhuǎn)賬3個(gè)比特幣
Transaction tx1 = new Transaction(CryptoUtil.UUID(), sender, recipient, 3);
//已發(fā)生但未記賬的交易記錄,發(fā)送者給接收者轉(zhuǎn)賬1個(gè)比特幣
Transaction tx2 = new Transaction(CryptoUtil.UUID(), sender, recipient, 1);
txs1.add(tx1);
txs1.add(tx2);
//挖礦
mineBlock(blockchain, txs1, sender);
System.out.println(sender + "錢包的余額為:" + getWalletBalance(blockchain, sender));
System.out.println(recipient + "錢包的余額為:" + getWalletBalance(blockchain, recipient));
}
感謝各位的閱讀,以上就是“怎么用java實(shí)現(xiàn)簡(jiǎn)單比特幣功能”的內(nèi)容了,經(jīng)過(guò)本文的學(xué)習(xí)后,相信大家對(duì)怎么用java實(shí)現(xiàn)簡(jiǎn)單比特幣功能這一問(wèn)題有了更深刻的體會(huì),具體使用情況還需要大家實(shí)踐驗(yàn)證。這里是億速云,小編將為大家推送更多相關(guān)知識(shí)點(diǎn)的文章,歡迎關(guān)注!
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