java nio book

Java NIO, which features non-blocking, channel multiplexing, greatly improves the efficiency of TCP communications, and because Java NiO has non-blocking features, a single line can be used to manage multiple links based on this feature. The following program demonstrates a simple simulation of the build of a TCP serve

Original link Jakob Jenkov Translator: Zheng Yuting proofreading: DingThe Serversocketchannel in Java NiO is a channel that can listen for incoming TCP connections, just like serversocket in standard IO. The Serversocketchannel class is in the Java.nio.channels package.Here's an example: 01 ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();

Bo Master Knowledge Level Limited, can only provide a narrow understanding of the individual, if there are newcomers read here, suggest to look at other tutorials or API, if you do not understand, look again, if there is Dalao read here, hope to point out the understanding of the problem ~ Thank youJava provides sockets and ServerSocket packets for network communication, but the implementation is blocking, with only one connection at a time, which leads to a bad experience. Of course, we can als

In fact, Java NiO introduces an asynchronous mechanism. asynchronous I/O has select poll epoll in Linux and supports multiplexing. In Java, it is implemented through a complete set of NiO classes, mainly including: Bytebuffer Socketchannel Serversocketchannel Selector Selectionkey Registration: Channel calls register

The FileChannel in Java NiO is a channel that connects to a file. You can read and write files through a file channel.FileChannel cannot be set to non-blocking mode, it is always running in blocking mode.Open FileChannelBefore you can use FileChannel, you must first open it. However, we cannot directly open a filechannel and need to obtain a FileChannel instance by using a InputStream, OutputStream, or Rand

Java NIO DatagramchannelJava NIO Datagramchannel is a channel that can send and receive UDP packets. Because UDP is a non-connected network protocol, you cannot read and write to DatagramChannel other channels by default. instead, it sends and receives packets. Open DatagramchannelOpen a DatagramChannel代码 :Datagramchannel channel = datagramchannel.open (); Channe

In the Java NIO Framework Netty Tutorial (v)-The problem of mismatched messaging times we tried to analyze a mismatch in the number of messages sent and received. At that time the author was still puzzled. So decide to learn the selector mechanism of Java NIO first.After a simple understanding, the author boldly guesse

In Java NIO, the channel is used to abstract the connection between the program and the principal I/O operations, including files, sockets, or other devices. In short, it refers to a connection between an IO operator and an object.According to the channel interface definition, the channel only open and closed two states, only when the channel is in the open state for its operation, and the operation of the

Java NiO scatter/collectJava NiO comes with built-in scatter/gather support. Scatter/collect is a concept used in the process of reading and writing channels.Scattering from a channel reads a read operation that reads data into multiple buffers. Therefore, the data can be "scattered" from the channel into multiple buffers.A write to a channel is a write operation

ioexception{Selector acceptselector = Selectorprovider.provider (). Openselector (); /*Register the selector on the server socket and set the notification to accept the acceptance method. this tells selector that the socket wants to be placed in the ready table when the Accept operation occurson, therefore, agree that multivariate non-clogging I/O occurs. */Selectionkey Acceptkey = Ssc.register (Acceptselector,Selectionkey.op_accept);int keysadded = 0;The/*select method returns when an operatio

as follows, using non-blocking methodsprivate void Waitforconnection () throws ioexception{Selector acceptselector = Selectorprovider.provider (). Openselector (); /* Register the selector on the server socket and set the notification to accept method. This tells selector that the socket wants to be placed in the ready table when the Accept operation occurs */ Selectionkey acceptkey = Ssc.register (Acceptselector, Selectionkey.op_accept); int keysadded = 0; The /*select method retur

Related articlesJava Network Programming-nio and Netty (iv)Java Network Programming-nio and Netty (iii)Java Network Programming-nio and Netty (ii)Java Network Programming-nio and Netty

Java NIO Glob mode details, javanioglob detailsGlob mode in Java NIO Author: chszs, reprinted with note. Blog homepage: http://blog.csdn.net/chszs1. What is Glob? In programming, Glob is a pattern that uses wildcards to specify file names. For example:. Java is a simple Glob

reader to read and write, continue to read and write, continuously looping until read-write is completed. Java support for bio, NIO, AIO : Java BIO: Synchronization and blocking, the server implementation mode for a connection to a thread, that is, the client has a connection request when the server needs to start a thread to process, if the conne

Java NIO (2) Channel, javaniochannelIntroduction to Channel Channels First, open the description of JAVA. nio. channels. Channel in the java API documentation: public interface Channel extends Closeable We can see from the 2nd point that the Channel is similar to the strea

Java NiO non-clogging applications are commonly used in I/O reading and writing, we know that the performance bottleneck of the system operation is usually in the I/O read and write, including port and file operation, in the past, after opening an I/O channel, read () will be waiting on the port side read the byte content, if no content comes in, Read () is also silly and so on, this will affect our program

(). Shutdownoutput (); Stringresponse=receivedata (Test.socketchannel); SYSTEM.OUT.PRINTLN (response);} Publicstaticstringreceivedata (SOCKETCHANNELNBSP;SOCKETCHANNEL2) throws Ioexception{bytearrayoutputstreambaos=newbytearrayoutputstream (); stringresponse= ""; try{bytebufferbuffer=bytebuffer.allocate (1024); byte[]bytes;intcount=0;while ((count=socketchannel2.read (buffer)) >=0) {buffer.flip (); bytes=newbyte[count];buffer.get (bytes); Baos.write ( bytes); Buffer.clear ();} Bytes=baos.tobytea

This article is from my personal blog: Java NIO channel (ii)One, File ChannelThe file channel is always blocked and therefore cannot be placed in a non-clogging mode.The FileChannel object is thread-safe. Multiple processes can invoke methods concurrently on the same instance without causing any problems, but not all operations are multithreaded. Actions that affect the channel location or affect the file s

, it's easier to Exchange databasesInter-thread communication:It can be implemented directly by passing in shared variables.The memory-mapped file (mappedbytebuffer) of Java NIO makes me immediately associate the memory-mapped file of the Windows system. The memory-mapped file of a Windows system can be used to share data among multiple processes, that is, shared memory between processes, by mapping the sam

looking at the road to see if they want to reach the destination, then this process, the passenger (thread) has been blocked, and can not do other things, only when the destination, The passengers were able to get off, and so did the passengers behind them. Back to Java in IO and NiO to Io is a stream of processing data, byte processing, and NIO processing dat