Java NIO Channel to channel transfers

Java Nio  

1	Java NIO Tutorial
2	Java NIO Overview
3	Java NIO Channel
4	Java NIO Buffer
5	java NIO scatter/gather
6	Java NIO channel to channel transfers
7	Java NIO Selector
8	Java NIO FileChannel
9	Java NIO Socketchannel
10	Java NIO Serversocketchannel
11	Java NIO Datagramchannel
12	Java NIO Pipe
13	Java NIO vs. IO

Java NIO Channel to channel transfers
by Jakob JenkovConnect with me:
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Table of Contents

• Transferfrom ()
• TransferTo ()

In Java NIO can transfer data directly from one channel to another, if one of the channels is a FileChannel . The FileChannel class has a and transferTo() a transferFrom() method which does.

Transferfrom ()

The FileChannel.transferFrom() method transfers data from a source channel into the FileChannel . Here are 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;long count    = Fromchannel.size ();  Tochannel.transferfrom (Fromchannel, position, count);

position ), And how many bytes to transfer maximally (count ). If The source channel has fewer than count   Bytes, less is transfered.

Additionally, some implementations may transfer only the data the have ready on its SocketChannel SocketChannel internal buffer here and no W-even If the May later has more SocketChannel data available. Thus, it may not be transfer the entire data requested () from the to count SocketChannel FileChannel .

TransferTo ()

The transferTo() method transfer from a into some and other FileChannel channel. Here are 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;long count    = Fromchannel.size ();  Fromchannel.transferto (position, count, Tochannel);

Notice How similar the example was to the previous. The only real difference are the which FileChannel object the method is called on. The rest is the same.

The issue with was SocketChannel also present with the transferTo() method. SocketChannelthe implementation may be transfer bytes from FileChannel the until the send buffer was full, and then stop.

Next: Java NIO Selector

Java NIO Channel to channel transfers