Java Socket Multithreading

1. Server

Import Java.io.bufferedreader;import Java.io.ioexception;import Java.io.inputstream;import Java.io.inputstreamreader;import Java.io.outputstream;import Java.io.printwriter;import Java.net.*;import java.util.concurrent.*;p Ublic class Multithreadserver {private int port = 8821;private ServerSocket serversocket; Private Executorservice executorservice;//thread pool private final int pool_size = 10;//Single CPU thread pool size public multithreadserver () th Rows IOException {serversocket = new ServerSocket (port);//Runtime Availableprocessor () method returns the number of CPUs for the current system. Executorservice = Executors.newfixedthreadpool (Runtime.getruntime (). Availableprocessors () * POOL_ SIZE); SYSTEM.OUT.PRINTLN ("server Start");} public void Service () {while (true) {Socket socket = Null;try {//Receive client connection, as long as the client is connected, the accept () is triggered, thereby establishing a connection Socket = Serversocke T.accept (); Executorservice.execute (new Handler (socket));} catch (Exception e) {e.printstacktrace ();}}} public static void Main (string[] args) throws IOException {new Multithreadserver (). Service ();}} Class Handler IMPlements Runnable {Private socket socket;public Handler (socket socket) {this.socket = socket;} Private PrintWriter getwriter (socket socket) throws IOException {OutputStream socketout = Socket.getoutputstream (); return new PrintWriter (Socketout, True);} Private BufferedReader Getreader (socket socket) throws IOException {InputStream socketin = Socket.getinputstream (); return new BufferedReader (new InputStreamReader (Socketin)); public string Echo (String msg) {return "echo:" + msg;} public void Run () {try {System.out.println ("New connection accepted" + socket.getinetaddress () + ":" + socket.getport ()); B Ufferedreader br = getreader (socket); PrintWriter pw = getwriter (socket); String msg = null;while (msg = Br.readline ()) = null) {System.out.println (msg);p w.println (Echo (msg)), if (Msg.equals (" Bye ")) Break;}} catch (IOException e) {e.printstacktrace ();} finally {try {if (socket! = NULL) Socket.close ();} catch (IOException e) {E.PR Intstacktrace ();}}}

2. Client

Import Java.io.bufferedreader;import Java.io.ioexception;import Java.io.inputstreamreader;import Java.io.outputstream;import Java.net.socket;import Java.util.concurrent.executorservice;import Java.util.concurrent.executors;public class Multithreadclient {public static void main (string[] args) {int numtasks = 10; Executorservice exec = Executors.newcachedthreadpool (); for (int i = 0; i < numtasks; i++) {Exec.execute (CreateTask (i)); }}//defines a simple task private static Runnable createtask (final int taskID) {return new Runnable () {private socket socket = NULL;PR ivate int port = 8821;public void Run () {System.out.println ("Task" + TaskID + ": Start"); try {socket = new socket ("Localho St ", port);//Send Close command outputstream socketout = Socket.getoutputstream (); Socketout.write (" shutdown\r\n ". GetBytes ());// Feedback from the receiving server BufferedReader br = new BufferedReader (New InputStreamReader (Socket.getinputstream ())); String msg = null;while (msg = Br.readline ()) = null) System.out.println (msg); catch (IOException e) {E.prinTstacktrace ();}}};}} 

Java Socket Multithreading