Java NIO: The concept of the channel of the NIO series tutorial in Java

Source: Internet
Author: User

One: Java's NIO channel

Java NiO channels are similar to streams, but are somewhat different:

The ==> can read data from the channel and write data to the channel. But stream reads and writes are usually one-way.

==> channels can be read and written asynchronously.

The data in the ==> channel is always read to a buffer first, or it is always written from a buffer.

As mentioned above, the data is read from the channel to the buffer, and the data is written from the buffer to the channel. As shown in the following:




Second: implementation of the channel of NiO in Java

These are the most important implementations of the channel in Java NIO:

==>filechannel:

==>datagramchannel

==>socketchannel

==>serversocketchannel





Third: The role of the implementation of the Java NIO Channel


==>filechannel Read and write data from a file.

==>datagramchannel can read and write data on the network through UDP.

==>socketchannel can read and write data in the network via TCP.

==>serversocketchannel can listen for incoming TCP connections, like a Web server. A socketchannel is created for each new incoming connection.




Four: A basic example of a Java NIO channel

1  PackageCom.yeepay.sxf.testnio;2 3 Importjava.io.IOException;4 ImportJava.io.RandomAccessFile;5 ImportJava.nio.ByteBuffer;6 ImportJava.nio.channels.FileChannel;7 /**8 * Simple test of the role of channel components in the Java NiO9  * @authorSXFTen  * One  */ A  Public classTestchannelfornio { -  -      Public Static voidMain (string[] args)throwsIOException { the         //loading files into memory/usr/sxf/testnio file -Randomaccessfile Afile =NewRandomaccessfile ("/usr/sxf/testnio", "RW"); -         //get the channel from the file -FileChannel Inchannel =Afile.getchannel (); +         //registers a buffer from the channel, 48 bytes at a time -Bytebuffer buf = Bytebuffer.allocate (48); +         //Read the first time A         intBytesread =Inchannel.read (BUF); at         //See if there's any data in the file -          while(Bytesread! =-1) { -             //print the number of characters that are read for the first time -System.out.println ("Read" +bytesread); -              -             //Note that the call to Buf.flip () first reads the data into buffer, then inverts the buffer, and then reads the data from buffer.  in Buf.flip (); -              to             //print each character to a console +              while(Buf.hasremaining ()) { -System.out.print ((Char) Buf.get ()); the             } *              $             //clear this buffer .Panax Notoginseng buf.clear (); -      theBytesread =Inchannel.read (BUF); +  A         } the  + afile.close (); -     } $}
View Code

Java NIO: The concept of the channel of the NIO series tutorial in Java

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.