netty - 如何将 ChannelBuffer 类型保存到文件中

Question

我尝试使用以下代码：

saver=new FileOutputStream(file);
byte c;
while ( content.readable() ){ //content is a ChannelBuffer type
    c = content.readByte();
    saver.write(c); 
   }   

但是由于文件流是二进制的，因此写入速度似乎真的很慢！有没有办法将通道缓冲区保存到文件中非常快？

Answer 1

尝试将整个缓冲区写入文件。 此示例代码来自 netty 文件上传应用。

    FileOutputStream outputStream = new FileOutputStream(file);
    FileChannel localfileChannel = outputStream.getChannel();
    ByteBuffer byteBuffer = buffer.toByteBuffer();
    int written = 0;
    while (written < size) {
        written += localfileChannel.write(byteBuffer);
    }
    buffer.readerIndex(buffer.readerIndex() + written);
    localfileChannel.force(false);
    localfileChannel.close();

Answer 2

    ChannelBuffer cBuffer = ***;
    try (FileOutputStream foStream = new FileOutputStream(filepath)) {
        while (cBuffer.readable()) {
            byte[] bb = new byte[cBuffer.readableBytes()];
            cBuffer.readBytes(bb);
            foStream.write(bb);
        }
        foStream.flush();
    } catch (Exception e) {
        e.printStackTrace();
    }