Introduction to Java IO multiplexing technology

<span style= "FONT-SIZE:18PX;" >package com.winwill.nio;/** * @author qifuguang * @date 15-2-4 pm 2:07 */public class Timeservermain {public    Stati c void Main (string[] args) throws Exception {        //Start time server        new Thread (New Selectortimeserver ()). Start ();}    } </span>

<span style= "FONT-SIZE:18PX;" >package com.winwill.nio;/** * @author qifuguang * @date 15-2-4 pm 2:09 */public class Timeclientmain {public    Stati c void Main (string[] args) throws Exception {        //Create 100 clients to connect to server for        (int i = 0; i <; i++) {            new Thread (New Selectortimeclient (i + 1)). Start ();}}    </span>

<span style= "FONT-SIZE:18PX;" >package Com.winwill.nio;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.text.simpledateformat;import Java.util.date;import    java.util.iterator;/** * @author Qifuguang * @date 15-2-4 pm 1:21 */public class Selectortimeserver implements Runnable {    private static final String Time_order = "Query time";    Private Selector Selector;    Private Serversocketchannel Serverchannel;    Private volatile Boolean stop = false;     /** * Create selector, create Serversocketchannel, and set to non-blocking mode, register to selector.        * * @throws Exception */Public Selectortimeserver () throws Exception {selector = Selector.open ();        Serverchannel = Serversocketchannel.open ();        Serverchannel.socket (). bind (New inetsocketaddress (8080));        Serverchannel.configureblocking (FALSE);Serverchannel.register (selector, selectionkey.op_accept);     }/** * Polling listener selector. */@Override public void Run () {try {System.out.println ("Time server started!            ");                while (!stop) {selector.select (1000);                iterator<selectionkey> Iterator = Selector.selectedkeys (). Iterator ();                    while (Iterator.hasnext ()) {Selectionkey key = Iterator.next ();                    Iterator.remove ();                Handlekey (key);            }} if (selector! = null) {selector.close ();        }} catch (Exception e) {e.printstacktrace ();     }}/** * Handles events of interest to each selector.     * * @param key poll to get Selectionkey.  */private void Handlekey (Selectionkey key) {try {if (Key.isvalid ()) {//If the connection succeeds if (Key.isacceptable ()) {//Supervisor hears a new client connection Socketchannel accept = ((ServersoCketchannel) Key.channel ()). Accept ();  Establish a connection to the client accept.configureblocking (FALSE); Set the connection as non-blocking mode Accept.register (selector, selectionkey.op_read);                Register the connection to selector System.out.println ("Discover new client connections ..."); } if (Key.isreadable ()) {//monitor heard there is a client sending request Socketchannel Channel = (socketchannel) key.                    Channel ();                    Read request from client Bytebuffer buff = bytebuffer.allocate (1024);                    int size = Channel.read (buff);                        if (Size > 0) {byte[] b = new Byte[size];                        Buff.flip ();                        Buff.get (b);                        String order = new String (b, "UTF-8");                        System.out.println ("Received client command:" + order);                        String content = ""; if (Order.equalsignorecase (Time_order)) {content = new SimpledatEformat ("Yyyy-mm-dd HH:mm:ss"). Format (new Date ());                        } else {content = "command error";                    }//According to the request from the client to make the corresponding action, and return the processing results to the client Dowrite (channel, content);                        } else if (size < 0) {channel.close ();                    Key.cancel ();                    } else {;        }}}} catch (Exception e) {e.printstacktrace ();     }}/** * Sends the specified message to the specified socketchannel.  * * @param SC needs to send a message to which Socketchannel * @param content needs to be sent * @throws Exception */private void        Dowrite (Socketchannel SC, String content) throws Exception {Bytebuffer buffer = bytebuffer.allocate (1024);        Buffer.put (Content.getbytes ("UTF-8"));        Buffer.flip ();        Sc.write (buffer); if (!buffer.hasremaining ()) {System.out.prinTLN ("Send Message to Client:" + content); }}}</span>

<span style= "FONT-SIZE:18PX;" >package Com.winwill.nio;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.util.iterator;/** * @author Qifuguang * @date 15-2-4 pm 1:21 */public class Selectortimeclient implements Runnable {    private static final String Time_order = "Query time";    Private Socketchannel channel;    Private Selector Selector;    Private volatile Boolean stop = false;    Private Integer index;     /** * Create selector, Socketchannel.     * * @param index client number. * @throws Exception */public selectortimeclient (Integer index) throws Exception {selector = Selector.open (        );        Channel = Socketchannel.open ();        Channel.configureblocking (FALSE);    This.index = index;     }/** * Polls listeners for events that are just interested in selector. */@Override public void Run () {try {System.out.println ("+ Index +" customerEnd-Start! "); First try to connect to the server asynchronously, if the connection is successful, you only need to register the channel to the selector read event,//Read the results returned by the server.            If it is unsuccessful (the client has sent a sync packet to the server, but the server does not return an ACK packet, the physical link has not yet succeeded)//the channel is registered to the Selector connect event, waiting for the ACK packet returned by the server.                if (Channel.connect (new inetsocketaddress (8080))) {Channel.register (selector, selectionkey.op_read);            Dowrite (channel, Time_order);            } else {Channel.register (selector, selectionkey.op_connect);                } while (!stop) {selector.select (1000);                iterator<selectionkey> Iterator = Selector.selectedkeys (). Iterator ();                    while (Iterator.hasnext ()) {Selectionkey key = Iterator.next ();                    Socketchannel sc = (socketchannel) key.channel ();                    Iterator.remove ();                            if (Key.isvalid ()) {if (key.isreadable ()) {//} hears a readable event and reads the processing result returned by the server. Bytebuffer bUff = bytebuffer.allocate (1024);                            int size = Sc.read (buff);                                if (Size > 0) {byte[] b = new Byte[size];                                Buff.flip ();                                Buff.get (b);                                SYSTEM.OUT.PRINTLN ("+ index +" client gets the server return time: "+ new String (b));                            Stop = true;                                } else if (size < 0) {sc.close ();                            Key.cancel ();                            } else {;                            }} if (Key.isconnectable ()) {//monitor the server returned an ACK packet, ready to complete the connection establishment if (Sc.finishconnect ()) {//Call this method to complete the establishment of a physical link connection sc.register (selector, Selectionkey . Op_read);            After establishing the connection, register the listening read event Dowrite (SC, time_order);                } else {system.exit (1);            Otherwise, the program exits}}}}            if (selector! = null) {selector.close ();        }} catch (Exception e) {e.printstacktrace ();     }}/** * Sends the specified message to the specified channel. * * @param channel to which channel to send message * @param content needs to be sent message * @throws Exception */private void Dowrite        (Socketchannel channel, String content) throws Exception {Bytebuffer buff = bytebuffer.allocate (1024);        Buff.put (Content.getbytes ("UTF-8"));        Buff.flip ();        Channel.write (Buff);        if (!buff.hasremaining ()) {System.out.println ("+ Index +" client successfully sends a request to the server: "+ content); }}}</span>

Introduction to Java IO multiplexing technology