Java将整数转换为字节数组

看看ByteBuffer类。

ByteBuffer b = ByteBuffer.allocate(4);//b.order(ByteOrder.BIG_ENDIAN); // optional, the initial order of a byte buffer is always BIG_ENDIAN.b.putInt(0xAABBCCDD);byte[] result = b.array();

设置字节顺序保证了

result[0] == 0xAA

result[1] == 0xBB

result[2] == 0xCC

result[3] == 0xDD

或者，你可以手动执行以下操作：

byte[] toBytes(int i){  byte[] result = new byte[4];  result[0] = (byte) (i >> 24);  result[1] = (byte) (i >> 16);  result[2] = (byte) (i >> 8);  result[3] = (byte) (i );  return result;}

该

ByteBuffer

java.nio.Bits

ByteBuffer.putInt()

private static byte int3(int x) { return (byte)(x >> 24); }private static byte int2(int x) { return (byte)(x >> 16); }private static byte int1(int x) { return (byte)(x >>  8); }private static byte int0(int x) { return (byte)(x >>  0); }