Java nio implements non-blocking Socket communication instances

Package com. java. xiong. net17; import java. io. IOException; import java.net. inetSocketAddress; import java. nio. byteBuffer; import java. nio. channels. channel; import java. nio. channels. selectionKey; import java. nio. channels. selector; import java. nio. channels. serverSocketChannel; import java. nio. channels. socketChannel; import java. nio. charset. charset; public class NServer {// selectorprivate Selec used to detect all Channel states Tor selector = null; static final int PORT = 30000; // defines the private Charset charse = Charset, which implements encoding and decoding. forName ("GBK"); public void init () throws IOException {selector = Selector. open (); // open an unbound ServerSocketChannel through the open method. It is ServerSocketChannel server = ServerSocketChannel. open (); InetSocketAddress isa = new InetSocketAddress ("127.0.0.1", PORT); // bind the ServerSocketChannel to the specified IP address server. bind (isa); // set Sets serverSocket to work in non-blocking mode. configureBlocking (false); // register the server with the specified selector Object server. register (selector, SelectionKey. OP_ACCEPT); while (selector. select ()> 0) {// process each selected SelectionKeyfor (SelectionKey sk: selector. selectedKeys () {// Delete the SelectionKeyselector being processed from the selected Kye set on the selector. selectedKeys (). remove (sk); // if the Channel corresponding to sk contains the client connection request if (sk. isAcceptable () {// call the accept method to receive connections and generate Socke for the server segment TChennalSocketChannel SC = server. accept (); // sets the non-blocking mode SC. configureBlocking (false); // register the SocketChannel to selectorsc. register (selector, SelectionKey. OP_READ);} // if the Channel corresponding to sk has data, read if (sk. isReadable () {// gets the Channel of the SelectionKey pair to the bank. The Channel has the scaled data SocketChannel SC = (SocketChannel) sk. channel (); // define the remarks. Execute ByteBufferByteBuffer buff = ByteBuffer to read the data source. allocate (1024); String content = ""; // start to read data try {w Hile (SC. read (buff)> 0) {buff. flip (); content + = charse. decode (buff);} System. out. println ("read data:" + content); // set the Channel corresponding to sk to prepare for the next sk read. interestOps (SelectionKey. OP_READ);} // if an exception occurs to the bank Channel of the sk captured, it indicates that the Client corresponding to the // Channel has a problem, so the catch (IOException io) is canceled from the Selector) {// Delete the specified SelectionKeysk from Selector. cancel (); if (sk. channel ()! = Null) {sk. channel (). close () ;}/// if the content length is greater than 0, the consecutive days information is not empty if (content. length ()> 0) {// traverse all SelectionKeyfor (SelectionKey key: selector. keys () {// obtain the ChannelChannel targerChannel = key. channel (); // if the Channel is a SocketChannel object if (targerChannel instanceof SocketChannel) {// write the read content to the Channel SocketChannel dest = (SocketChannel) targerChannel; dest. write (charse. encode (content) ;}}}}} public static void main (String [] args) throws IOException {new NServer (). init ();}}

 

Package com. java. xiong. net17; import java. io. IOException; import java.net. inetSocketAddress; import java. nio. byteBuffer; import java. nio. channels. selectionKey; import java. nio. channels. selector; import java. nio. channels. socketChannel; import java. nio. charset. charset; import java. util. listener; public class NClient {// defines the Selector object private Selector selector = null for Sockethannel detection; static final int PORT = 30000; // defines the character set private Charset charset = Charset for encoding processing. forName ("GBK"); // client SocketChannelprivate SocketChannel SC = null; public void init () throws IOException {selector = Selector. open (); InetSocketAddress isa = new InetSocketAddress ("127.0.0.1", PORT); // call the open static method to create SocketChannelsc = SocketChannel to connect to the specified host. open (isa); // sets the SC to work in a non-blocking mode. configureBlocking (false); // register the SocketChannel object to the specified Selectorsc. register (selector, SelectionKey. OP_READ); // start the new ClientThread () thread for reading server data (). start (); // create the keyboard input stream Scanner scan = new keyboard (System. in); while (scan. hasNextLine () {// read the input String line of the keyboard = scan. nextLine (); // output the content of the keyboard to SC in SocketChanenel. write (charset. encode (line) ;}}// defines the private class ClientThread extends Thread {@ Overridepublic void run () {try {while (selector. select ()> 0) {// traverse the SelectionKeyfor (SelectionKey sk: selector. selectedKeys () {// Delete the SelectionKeyselector being processed. selectedKeys (). remove (sk); // if the Channel corresponding to the SelectionKey contains readable data if (sk. isReadable () {// use NIO to read data in the Channel SocketChannel SC = (SocketChannel) sk. channel (); String content = ""; ByteBuffer bff = ByteBuffer. allocate (1, 1024); while (SC. read (bff)> 0) {SC. read (bff); bff. flip (); content + = charset. decode (bff);} // print the read content System. out. println ("chat information:" + content); sk. interestOps (SelectionKey. OP_READ) ;}}} catch (IOException io) {io. printStackTrace () ;}} public static void main (String [] args) throws IOException {new NClient (). init ();}}