Multithreaded Java Socket programming

The Java 5 executorservice is used to implement multi-threading in a thread pool, which simulates the client sending requests to the same server side.

1. Service-side

 PackageLocalsocket;ImportJava.io.BufferedReader;Importjava.io.IOException;ImportJava.io.InputStream;ImportJava.io.InputStreamReader;ImportJava.io.OutputStream;ImportJava.io.PrintWriter;Importjava.net.*;Importjava.util.concurrent.*; Public classMultithreadserver {Private intport=8821; PrivateServerSocket ServerSocket; PrivateExecutorservice Executorservice;//thread Pool    Private Final intpool_size=10;//single CPU thread pool size         PublicMultithreadserver ()throwsioexception{ServerSocket=NewServerSocket (port); //the runtime's Availableprocessor () method returns the number of CPUs in the current system.Executorservice=executors.newfixedthreadpool (Runtime.getruntime (). Availableprocessors () *pool_size); System.out.println ("Server Startup"); }         Public voidService () { while(true) {Socket Socket=NULL; Try {                //receiving a client connection, as long as the customer is connected, the accept () is triggered and the connection is establishedsocket=serversocket.accept (); Executorservice.execute (NewHandler (socket)); } Catch(Exception e) {e.printstacktrace (); }        }    }         Public Static voidMain (string[] args)throwsIOException {Newmultithreadserver (). Service (); }}classHandlerImplementsrunnable{Privatesocket socket;  PublicHandler (socket socket) { This. socket=socket; }    PrivatePrintWriter getwriter (Socket socket)throwsioexception{outputstream socketout=Socket.getoutputstream (); return NewPrintWriter (Socketout,true); }    PrivateBufferedReader Getreader (Socket socket)throwsioexception{InputStream Socketin=Socket.getinputstream (); return NewBufferedReader (NewInputStreamReader (Socketin)); }     Publicstring Echo (String msg) {return"Echo:" +msg; }     Public voidrun () {Try{System.out.println ("New Connection Accepted" +socket.getinetaddress () + ":" +Socket.getport ()); BufferedReader BR=Getreader (socket); PrintWriter PW=getwriter (socket); String msg=NULL;  while((Msg=br.readline ())! =NULL) {System.out.println (msg);                Pw.println (Echo (msg)); if(Msg.equals ("Bye"))                     Break; }        } Catch(IOException e) {e.printstacktrace (); }finally{            Try {                if(socket!=NULL) Socket.close (); } Catch(IOException e) {e.printstacktrace (); }        }    }}

2. Client

 PackageLocalsocket;ImportJava.io.BufferedReader;Importjava.io.IOException;ImportJava.io.InputStreamReader;ImportJava.io.OutputStream;ImportJava.net.Socket;ImportJava.util.concurrent.ExecutorService;Importjava.util.concurrent.Executors; Public classmultithreadclient { Public Static voidMain (string[] args) {intNumtasks = 10; Executorservice exec=Executors.newcachedthreadpool ();  for(inti = 0; i < numtasks; i++) {Exec.execute (CreateTask (i)); }    }    //define a simple task    Private StaticRunnable CreateTask (Final intTaskID) {        return NewRunnable () {PrivateSocket socket =NULL; Private intport=8821;  Public voidrun () {System.out.println ("Task" + TaskID + ": Start"); Try{Socket=NewSocket ("localhost", Port); //Send Close CommandOutputStream socketout =Socket.getoutputstream (); Socketout.write ("Shutdown\r\n". GetBytes ()); //feedback from the receiving serverBufferedReader br =NewBufferedReader (NewInputStreamReader (Socket.getinputstream ())); String msg=NULL;  while(msg = Br.readline ())! =NULL) System.out.println (msg); } Catch(IOException e) {e.printstacktrace ();    }            }        }; }}

Multithreaded Java Socket programming