本文整理了Java中org.bitcoinj.core.Utils.readUint32BE()方法的一些代码示例，展示了Utils.readUint32BE()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Utils.readUint32BE()方法的具体详情如下：
包路径：org.bitcoinj.core.Utils
类名称：Utils
方法名：readUint32BE

Utils.readUint32BE介绍

[英]Parse 4 bytes from the byte array (starting at the offset) as unsigned 32-bit integer in big endian format.
[中]将字节数组中的4个字节（从偏移量开始）解析为big-endian格式的无符号32位整数。

代码示例

代码示例来源：origin: blockchain/unused-My-Wallet-V3-jar

/**
 * BIP 43 purpose needs to be 31 bit or less. For lack of a BIP number we take the first 31 bits
 * of the SHA256 hash of a reverse domain.
 */
private static int getPurpose(String sub) throws NoSuchAlgorithmException, UnsupportedEncodingException {
  MessageDigest md = MessageDigest.getInstance("SHA-256");
  String text = "info.blockchain."+sub;
  md.update(text.getBytes("UTF-8"));
  byte[] hash = md.digest();
  byte[] slice = Arrays.copyOfRange(hash, 0, 4);
  return (int) (Utils.readUint32BE(slice, 0) & 0x7FFFFFFF); // 510742
}

代码示例来源：origin: cash.bitcoinj/bitcoinj-core

/**
 * MPI encoded numbers are produced by the OpenSSL BN_bn2mpi function. They consist of
 * a 4 byte big endian length field, followed by the stated number of bytes representing
 * the number in big endian format (with a sign bit).
 * @param hasLength can be set to false if the given array is missing the 4 byte length field
 */
public static BigInteger decodeMPI(byte[] mpi, boolean hasLength) {
  byte[] buf;
  if (hasLength) {
    int length = (int) readUint32BE(mpi, 0);
    buf = new byte[length];
    System.arraycopy(mpi, 4, buf, 0, length);
  } else
    buf = mpi;
  if (buf.length == 0)
    return BigInteger.ZERO;
  boolean isNegative = (buf[0] & 0x80) == 0x80;
  if (isNegative)
    buf[0] &= 0x7f;
  BigInteger result = new BigInteger(buf);
  return isNegative ? result.negate() : result;
}

代码示例来源：origin: greenaddress/GreenBits

/**
 * MPI encoded numbers are produced by the OpenSSL BN_bn2mpi function. They consist of
 * a 4 byte big endian length field, followed by the stated number of bytes representing
 * the number in big endian format (with a sign bit).
 * @param hasLength can be set to false if the given array is missing the 4 byte length field
 */
public static BigInteger decodeMPI(byte[] mpi, boolean hasLength) {
  byte[] buf;
  if (hasLength) {
    int length = (int) readUint32BE(mpi, 0);
    buf = new byte[length];
    System.arraycopy(mpi, 4, buf, 0, length);
  } else
    buf = mpi;
  if (buf.length == 0)
    return BigInteger.ZERO;
  boolean isNegative = (buf[0] & 0x80) == 0x80;
  if (isNegative)
    buf[0] &= 0x7f;
  BigInteger result = new BigInteger(buf);
  return isNegative ? result.negate() : result;
}

代码示例来源：origin: HashEngineering/dashj

/**
 * MPI encoded numbers are produced by the OpenSSL BN_bn2mpi function. They consist of
 * a 4 byte big endian length field, followed by the stated number of bytes representing
 * the number in big endian format (with a sign bit).
 * @param hasLength can be set to false if the given array is missing the 4 byte length field
 */
public static BigInteger decodeMPI(byte[] mpi, boolean hasLength) {
  byte[] buf;
  if (hasLength) {
    int length = (int) readUint32BE(mpi, 0);
    buf = new byte[length];
    System.arraycopy(mpi, 4, buf, 0, length);
  } else
    buf = mpi;
  if (buf.length == 0)
    return BigInteger.ZERO;
  boolean isNegative = (buf[0] & 0x80) == 0x80;
  if (isNegative)
    buf[0] &= 0x7f;
  BigInteger result = new BigInteger(buf);
  return isNegative ? result.negate() : result;
}

代码示例来源：origin: fr.acinq/bitcoinj-core

/**
 * MPI encoded numbers are produced by the OpenSSL BN_bn2mpi function. They consist of
 * a 4 byte big endian length field, followed by the stated number of bytes representing
 * the number in big endian format (with a sign bit).
 * @param hasLength can be set to false if the given array is missing the 4 byte length field
 */
public static BigInteger decodeMPI(byte[] mpi, boolean hasLength) {
  byte[] buf;
  if (hasLength) {
    int length = (int) readUint32BE(mpi, 0);
    buf = new byte[length];
    System.arraycopy(mpi, 4, buf, 0, length);
  } else
    buf = mpi;
  if (buf.length == 0)
    return BigInteger.ZERO;
  boolean isNegative = (buf[0] & 0x80) == 0x80;
  if (isNegative)
    buf[0] &= 0x7f;
  BigInteger result = new BigInteger(buf);
  return isNegative ? result.negate() : result;
}

代码示例来源：origin: fr.acinq/bitcoinj-core

long size = Utils.readUint32BE(Utils.reverseBytes(bytes), 0);

代码示例来源：origin: HashEngineering/dashj

long size = Utils.readUint32BE(Utils.reverseBytes(bytes), 0);

代码示例来源：origin: cash.bitcoinj/bitcoinj-core

long size = Utils.readUint32BE(Utils.reverseBytes(bytes), 0);

代码示例来源：origin: greenaddress/GreenBits

long size = Utils.readUint32BE(Utils.reverseBytes(bytes), 0);