Java实现生成比特币地址代码

下面是一个简单的Java代码示例，用于生成比特币地址。

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;

public class BitcoinAddressGenerator {
    
    // 生成比特币地址
    public static String generateBitcoinAddress(String publicKey) {
        try {
            byte[] publicKeyBytes = hexStringToByteArray(publicKey);
            
            // 计算RIPEMD160哈希值
            MessageDigest md = MessageDigest.getInstance("RIPEMD160");
            byte[] hashBytes = md.digest(publicKeyBytes);
            
            // 添加版本前缀
            byte[] versionBytes = {0x00};
            byte[] extendedHashBytes = new byte[hashBytes.length + versionBytes.length];
            System.arraycopy(versionBytes, 0, extendedHashBytes, 0, versionBytes.length);
            System.arraycopy(hashBytes, 0, extendedHashBytes, versionBytes.length, hashBytes.length);
            
            // 计算校验和
            byte[] checksum = calculateChecksum(extendedHashBytes);
            
            // 添加校验和
            byte[] addressBytes = new byte[extendedHashBytes.length + checksum.length];
            System.arraycopy(extendedHashBytes, 0, addressBytes, 0, extendedHashBytes.length);
            System.arraycopy(checksum, 0, addressBytes, extendedHashBytes.length, checksum.length);
            
            // Base58编码
            return Base58.encode(addressBytes);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        
        return null;
    }
    
    // 将十六进制字符串转换为字节数组
    public static byte[] hexStringToByteArray(String hexString) {
        int length = hexString.length();
        byte[] byteArray = new byte[length / 2];
        
        for (int i = 0; i < length; i += 2) {
            byteArray[i / 2] = (byte) ((Character.digit(hexString.charAt(i), 16) << 4)
                    + Character.digit(hexString.charAt(i + 1), 16));
        }
        
        return byteArray;
    }
    
    // 计算校验和
    public static byte[] calculateChecksum(byte[] bytes) {
        try {
            MessageDigest md = MessageDigest.getInstance("SHA-256");
            byte[] hashBytes = md.digest(md.digest(bytes));
            return Arrays.copyOfRange(hashBytes, 0, 4);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        
        return null;
    }
    
    public static void main(String[] args) {
        String publicKey = "0000000000000000000000000000000000000000000000000000000000000000";
        String bitcoinAddress = generateBitcoinAddress(publicKey);
        System.out.println("Bitcoin Address: " + bitcoinAddress);
    }
}

这段代码可以使用给定的公钥生成对应的比特币地址。请注意，这只是一个简单的示例，没有涉及私钥、签名和交易等相关的内容。