我有一个 byte[4] 包含一个 32 位无符号整数(大端序),我需要将它转换为 long(因为 int 不能保存无符号数).
I have a byte[4] which contains a 32-bit unsigned integer (in big endian order) and I need to convert it to long (as int can't hold an unsigned number).
另外,我该怎么做,反之亦然(即从包含 32 位无符号整数的 long 到 byte[4])?
Also, how do I do it vice-versa (i.e. from long that contains a 32-bit unsigned integer to byte[4])?
听起来像是 ByteBuffer.
有点像
public static void main(String[] args) {
byte[] payload = toArray(-1991249);
int number = fromArray(payload);
System.out.println(number);
}
public static int fromArray(byte[] payload){
ByteBuffer buffer = ByteBuffer.wrap(payload);
buffer.order(ByteOrder.BIG_ENDIAN);
return buffer.getInt();
}
public static byte[] toArray(int value){
ByteBuffer buffer = ByteBuffer.allocate(4);
buffer.order(ByteOrder.BIG_ENDIAN);
buffer.putInt(value);
buffer.flip();
return buffer.array();
}
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