将字节从一个ByteBuffer传输到另一个

好吧，我已经适应了@Richard的答案：

public static int transferAsMuchAsPossible(          ByteBuffer bbuf_dest, ByteBuffer bbuf_src){  int nTransfer = Math.min(bbuf_dest.remaining(), bbuf_src.remaining());  if (nTransfer > 0)  {    bbuf_dest.put(bbuf_src.array(),        bbuf_src.arrayOffset()+bbuf_src.position(),        nTransfer);    bbuf_src.position(bbuf_src.position()+nTransfer);  }  return nTransfer;}

并进行测试以确保其有效：

public static boolean transferTest(){    ByteBuffer bb1 = ByteBuffer.allocate(256);    ByteBuffer bb2 = ByteBuffer.allocate(50);    for (int i = 0; i < 100; ++i)    {        bb1.put((byte)i);    }    bb1.flip();    bb1.position(5);    ByteBuffer bb1a = bb1.slice();    bb1a.position(2);    // bb3 includes the 5-100 range    bb2.put((byte)77);    // something to see this works when bb2 isn't empty    int n = transferAsMuchAsPossible(bb2, bb1a);    boolean itWorked = (n == 49);    if (bb1a.position() != 51)        itWorked = false;    if (bb2.position() != 50)        itWorked = false;    bb2.rewind();    if (bb2.get() != 77)        itWorked = false;    for (int i = 0; i < 49; ++i)    {        if (bb2.get() != i+7)        { itWorked = false; break;        }    }    return itWorked;}