Java.nio.channels-based programming practice

Service-side code

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.ServerSocketChannel; Import Java.nio.channels.socketchannel;import Java.util.iterator;import Java.util.set;import Java.util.concurrent.timeunit;import Org.slf4j.logger;import Org.slf4j.loggerfactory;public class NIOSocketServer Extends Thread {private static final Logger LOG = Loggerfactory.getlogger (niosocketserver.class);p rivate static final Str ing CHARSET = "UTF-8";p rivate static final int buffer_size = 1024;private static final int fail_try_num = 3;private Select or selector;private serversocketchannel ssc;private static niosocketserver server;/** * Program Entry * * @param args */public sta tic void Main (string[] args) {server = new niosocketserver (); try {//Server.setdaemon (TRUE); Server.initserver (); Server.start ();} catch (Exception e) {//If an exception occurs, close the client server.stopserver () directly; System.exit (1);}} @Overridepublic VOID run () {int failnum = 0;while (true) {try {int select = Selector.select (), if (select > 0) {set<selectionkey> ke ys = Selector.selectedkeys ();iterator<selectionkey> iter = Keys.iterator (); while (Iter.hasnext ()) {SelectionKey Key = Iter.next (), if (key.isacceptable ()) {doacceptable (key);} if (key.iswritable ()) {dowritemessage (key);} if (key.isreadable ()) {doreadmessage (key);} if (key.isconnectable ()) {doconnectable (key);} Iter.remove ();}}} catch (Exception e) {failnum++;if (Failnum > Fail_try_num) {server.stopserver ();}}} /** * Initialize server-side program, start listening port * * @throws ioexception */private void Initserver () throws IOException {selector = Selector.open () ; SSC = Serversocketchannel.open (); ssc.configureblocking (false); Ssc.socket (). bind (New Inetsocketaddress (2181)); Ssc.register (selector, selectionkey.op_accept);} /** * Stop Server * * @throws ioexception */private void Stopserver () {try {if (selector! = null && selector.isopen ()) {Selector.close ();} if (SSC! = null && ssc.isopen ()) {ssc.close ();}} catch (IOException e) {log.info ("Close Server failed:" + e.getmessage ());}} /** * Processing of new client connections * * @param key * @throws ioexception */private void doacceptable (Selectionkey key) throws IOException {Serversocketchannel TMPSSC = (serversocketchannel) key.channel (); Socketchannel ss = Tmpssc.accept (); ss.configureblocking (false); Ss.register (selector, Selectionkey.op_read | Selectionkey.op_write);} /** * Connected * * @param key */private void doconnectable (Selectionkey key) {Log.info ("Connect is OK");} /** * Write message to Client * * @param key * @throws ioexception */private void Dowritemessage (Selectionkey key) throws Exception {Sock Etchannel sc = (socketchannel) key.channel (); Bytebuffer buffer = bytebuffer.wrap ("Server write msg to client". GetBytes (CHARSET)), while (Buffer.hasremaining ()) { Sc.write (buffer);} TimeUnit.SECONDS.sleep (1);}  /** * @param key * @throws ioexception */private void Doreadmessage (Selectionkey key) throws Exception {Socketchannel sc = (Socketchannel) Key.channel (); Bytebuffer BB = byTebuffer.allocate (buffer_size); int read = Sc.read (BB), while (Read > 0) {bb.flip (); byte[] Barr = new Byte[bb.limit ()];b B.get (Barr); Log.info ("server read msg from client:" + new String (Barr, CHARSET)); Bb.clear (); read = Sc.read (BB);} TimeUnit.SECONDS.sleep (1);}}

Client Code

Import Java.io.ioexception;import Java.io.unsupportedencodingexception;import Java.net.inetsocketaddress;import Java.nio.bytebuffer;import Java.nio.channels.closedchannelexception;import Java.nio.channels.selectionkey;import Java.nio.channels.selector;import Java.nio.channels.socketchannel;import Java.util.iterator;import Java.util.Set; Import Java.util.concurrent.timeunit;import Org.slf4j.logger;import Org.slf4j.loggerfactory;public class Niosocketclient extends Thread {private static final Logger LOG = Loggerfactory.getlogger (Niosocketclient.class); private static final String CHARSET = "UTF-8";p rivate static final int buffer_size = 1024;private static final int fail_tr   Y_num = 3;private Socketchannel socketchannel;private Selector selector;private static niosocketclient client;/** * Program Entry * * @param args */public static void main (string[] args) {client = new niosocketclient (); try {client.initclient (); Client.s Tart ();//Client.setdaemon (TRUE);} catch (Exception e) {//If an exception occurs, close the client directly ClieNt.close ();}} public void Run () {int failnum = 0;while (true) {try {writemessage (); int select = Selector.select (); SYSTEM.OUT.PRINTLN (Select), if (select > 0) {set<selectionkey> keys = Selector.selectedkeys ();iterator< Selectionkey> iter = Keys.iterator (); while (Iter.hasnext ()) {Selectionkey SK = Iter.next (); if (Sk.isreadable ()) { Readmessage (SK);} Iter.remove ();}}} catch (Exception e) {//If more than three occurrences of the exception occur, close the client failnum++;if (Failnum > Fail_try_num) {client.close (); System.exit (1);}}} public void Readmessage (Selectionkey sk) throws Exception,unsupportedencodingexception {Socketchannel CURSC = ( Socketchannel) Sk.channel (); Bytebuffer buffer = bytebuffer.allocate (buffer_size), while (Cursc.read (buffer) > 0) {buffer.flip (); Log.info ("read message from server:" + New String (Buffer.array (), CHARSET)); Buffer.clear ();} TimeUnit.SECONDS.sleep (1);} public void Writemessage () throws Exception {String ss = ' Client write msg to server '; Bytebuffer buffer = Bytebuffer.wrap (Ss.getbytes (CHARSET)); wHile (Buffer.hasremaining ()) {socketchannel.write (buffer);} TimeUnit.SECONDS.sleep (1);} public void Initclient () throws IOException, closedchannelexception {inetsocketaddress addr = new Inetsocketaddress (2181 ); Socketchannel = Socketchannel.open (); selector = Selector.open (); socketchannel.configureblocking (false); Socketchannel.register (selector, selectionkey.op_read);//Connect to Serversocketchannel.connect (addr); Socketchannel.finishconnect ()) {Log.info ("Check finish Connection");}} /** * Stop client */private void Close () {try {if (selector! = null && selector.isopen ()) {selector.close ()}; if (Socketchannel! = null && socketchannel.isopen ()) {socketchannel.close ();}} catch (IOException e) {log.info ("Shutdown client failed:" + e.getmessage ());}}}

Java.nio.channels-based programming practice