2.5 Gathering Writes

使用如下方式写入，可以将多个 buffer 的数据填充至 channel

try (RandomAccessFile file = new RandomAccessFile("helloword/3parts.txt", "rw")) { FileChannel channel = file.getChannel(); ByteBuffer d = ByteBuffer.allocate(4); ByteBuffer e = ByteBuffer.allocate(4); channel.position(11);

d.put(new byte[]{'f', 'o', 'u', 'r'});
e.put(new byte[]{'f', 'i', 'v', 'e'});
d.flip();
e.flip();
debug(d);
debug(e);
channel.write(new ByteBuffer[]{d, e});

} catch (IOException e) { e.printStackTrace(); }

结果 +-------------------------------------------------+ |  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f | +--------+-------------------------------------------------+----------------+ |00000000| 66 6f 75 72                                     |four            | +--------+-------------------------------------------------+----------------+ +-------------------------------------------------+ |  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f | +--------+-------------------------------------------------+----------------+ |00000000| 66 69 76 65                                     |five

文件内容 onetwothreefourfive|