How to realize data transfer between channels by using Netty
This article will explain in detail how to use Netty to achieve inter-channel data transmission, the content of the article is of high quality, so the editor will share it for you as a reference. I hope you will have some understanding of the relevant knowledge after reading this article.
1. FileChannel realizes data transmission between channels.
In Java NIO, if one of the two channels is FileChannel, you can transfer data directly from one channel to another channel.
TransferFrom ()
FileChannel's transferFrom () method transfers data from the source channel to FileChannel (this method is interpreted in JDK documents as transferring bytes from a given readable byte channel to a file in that channel). Here is a simple example:
RandomAccessFile fromFile = new RandomAccessFile ("fromFile.txt", "rw"); FileChannel fromChannel = fromFile.getChannel (); RandomAccessFile toFile = new RandomAccessFile ("toFile.txt", "rw"); FileChannel toChannel = toFile.getChannel (); long position = 0 rw count = fromChannel.size (); toChannel.transferFrom (position, count, fromChannel)
The input parameter position of the method indicates that data is written to the target file from position, and count represents the maximum number of bytes transferred. If the remaining space in the source channel is less than count bytes, the number of bytes transferred is less than the number of bytes requested.
Also note that in the implementation of SoketChannel, SocketChannel transmits only the data that is ready for the moment (perhaps less than count bytes). Therefore, SocketChannel may not transfer all the requested data (count bytes) to FileChannel.
TransferTo ()
The transferTo () method transfers data from FileChannel to other channel. Here is a simple example:
RandomAccessFile fromFile = new RandomAccessFile ("fromFile.txt", "rw"); FileChannel fromChannel = fromFile.getChannel (); RandomAccessFile toFile = new RandomAccessFile ("toFile.txt", "rw"); FileChannel toChannel = toFile.getChannel (); long position = 0 rw count = fromChannel.size (); fromChannel.transferTo (position, count, toChannel) On how to use Netty to achieve inter-channel data transmission is shared here, I hope the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.
