Java Socket Network Programming (multithreading Technology)

Client.java

Import java.io.*; import java.net.*; import java.util.*; Public classClient { Public Static voidMain (String args[]) {Scanner Scanner=NewScanner (System.inch); Socket Mysocket=NULL; DataInputStreaminch=NULL; DataOutputStream out=NULL;       Thread ReadData; Read Read=NULL; Try{mysocket=NewSocket (); Read=NewRead (); ReadData=NewThread (read); System. out. Print ("Enter the IP of the server:"); String IP=Scanner.nextline (); System. out. Print ("Input port number:"); intPort =Scanner.nextint (); if(mysocket.isconnected ()) {}Else{inetaddress Address=Inetaddress.getbyname (IP); Inetsocketaddress socketaddress=Newinetsocketaddress (Address,port);               Mysocket.connect (socketaddress); inch=NewDataInputStream (Mysocket.getinputstream ());  out=NewDataOutputStream (Mysocket.getoutputstream ()); Read.setdatainputstream (inch);            Readdata.start (); }       }       Catch(Exception e) {System. out. println ("Server is disconnected"+e); } System. out. Print ("Enter the radius of the garden (discard Please enter N):");  while(Scanner.hasnext ()) {Doubleradius=0; Try{radius=scanner.nextdouble (); }           Catch(inputmismatchexception exp) {system.exit (0); }              Try {                 out. writedouble (RADIUS); }           Catch(Exception e) {} }}}

Read.java

Import java.io.*; Public classRead implements Runnable {DataInputStreaminch;  Public voidSetdatainputstream (DataInputStreaminch) {       This.inch=inch; }    Public voidrun () {Doubleresult=0;  while(true) {        Try{result=inch. readdouble (); System. out. println ("area of the circle:"+result); System. out. Print ("Enter the radius of the garden (discard Please enter N):"); }        Catch(IOException e) {System. out. println ("is disconnected from the server"+e);  Break; }         }   }}

Server.java

Import java.io.*; import java.net.*; import java.util.*; Public classServer { Public Static voidMain (String args[]) {ServerSocket server=NULL;      Serverthread thread; Socket for you=NULL;  while(true) {        Try{server=NewServerSocket ( .); }        Catch(IOException E1) {System. out. println ("is listening .");//ServerSocket objects cannot be created repeatedly        }         Try{System. out. println ("waiting for customer to call"); You=server.accept (); System. out. println ("customer's address:"+you.getinetaddress ()); }         Catch(IOException e) {System. out. println ("Waiting for customer"); }        if(you!=NULL) {               NewServerthread (You). Start ();//start a dedicated thread for each customer        }      }   }}classServerthread extends Thread {socket socket; DataOutputStream out=NULL; DataInputStreaminch=NULL; String s=NULL; Serverthread (Socket t) {socket=T; Try{ out=NewDataOutputStream (Socket.getoutputstream ()); inch=NewDataInputStream (Socket.getinputstream ()); }      Catch(IOException e) {}} Public voidrun () { while(true) {         Try{DoubleR=inch. readdouble ();//blocked state, unless a message is read               Doublearea=math.pi*r*R;  out. writedouble (area); }         Catch(IOException e) {System. out. println ("Customer Leave"); return; }      }   } }

Java Socket Network Programming (multithreading Technology)