我正在尝试使用 NIO 使用 transferFrom 从几个较小的文件中组装一个文件。
对 transferFrom 的调用返回 0。没有例外。没有做任何事情来打开同步行为。
FileOutputStream fos = new FileOutputStream(path);
FileChannel fileBeingAssembled = fos.channel();
int progressiveOffset = 4096;
FileInputStream fis = new FileInputStream(tmpT5);
FileChannel channel = fis.getChannel();
channel.position(0);
int thisItemLength = (int)channel.size();
LOG.info("Writing " + tag + " at " + progressiveOffset + " length " + thisItemLength);
fileBeingAssembled.position(progressiveOffset);
long x = fileBeingAssembled.transferFrom(channel, progressiveOffset, thisItemLength);
LOG.info("transferred " + x);
progressiveOffset += thisItemLength;
示例日志:
4409 [main] INFO com.basistech.seg.writing.ModelOutputTask - available 1856216
4409 [main] INFO com.basistech.seg.writing.ModelOutputTask - Writing word at 15024620 length 1856216
4419 [main] INFO com.basistech.seg.writing.ModelOutputTask - transferred 0