Simple demo of thread pool

Server-side:

 Public  class Server {    Private intport=8821;PrivateServerSocket ServerSocket;PrivateExecutorservice Executorservice;//thread pool    Private Final intPool_size=Ten;//Single CPU thread pool size     Public Multithreadserver()throwsioexception{serversocket=NewServerSocket (port);the//runtime availableprocessor () method returns the number of CPUs for the current system.Executorservice=executors.newfixedthreadpool (Runtime.getruntime (). Availableprocessors () *POOL_SIZE); System.out.println ("Server started! "); } Public void Service(){ while(true) {Socket socket=NULL;Try{//Receive customer connection, as long as the customer is connected, will trigger accept (); Establish a connection! Socket=serversocket.accept (); Executorservice.execute (NewServerconthread (socket)); }Catch(Exception e)              {E.printstacktrace (); }          }      } Public Static void Main(string[] args)throwsIOException {NewServer (). Service (); }  }

Thread:

 Public  class serverconthread implements Runnable{      PrivatePrintWriter PW =NULL;PrivateBufferedReader br=NULL;PrivateSocket socket; PublicServerconthread (socket socket) {this.socket=socket; }PrivatePrintWriter getwriter (socket socket) throws ioexception{OutputStream Socketout=socket.getoutputstream ();return NewPrintWriter (Socketout,true); }PrivateBufferedReader Getreader (socket socket) throws ioexception{InputStream Socketin=socket.getinputstream ();return NewBufferedReader (NewInputStreamReader (Socketin)); } Publicvoid Run () {Try{System.out.println ("New Connection:"+socket.getinetaddress () +":"+socket.getport ());              Br=getreader (socket);              Pw=getwriter (socket); String msg=NULL; while((Msg=br.readline ())! =NULL) {System.out.println ("The client said:"msg); Pw.println ("I am the server!" ");        } br.close (); }Catch(IOException e)            {E.printstacktrace (); System.out.println ("Input output stream exception!" "); }Catch(Exceptione) {e.printstacktrace (); }finally{Try{if(socket!=NULL) Socket.close (); }Catch(IOException e)                  {E.printstacktrace (); System.out.println ("Input output stream exception!"            ); }          }      }  }

Client:

 Public classClient { Public Static void Main(string[] args) {intNumtasks =Ten; Executorservice exec = Executors.newcachedthreadpool (); for(intI=0;i<Ten; i++) {Exec.execute (CreateTask (i)); }    }//Define a simple task    Private StaticRunnableCreateTask(FinalintTaskID) {return NewRunnable () {PrivateSocket socket =NULL;Private intport=6666; Public void Run() {System. out. println ("Task"+ TaskID +": Start");Try{socket =NewSocket ("localhost", port);                    OutputStream socketout = Socket.getoutputstream (); PrintWriter PW =NewPrintWriter (socketout); Pw.println ("I am the client!" "); Pw.flush ();//Receive server feedbackBufferedReader br =NewBufferedReader (NewInputStreamReader (Socket.getinputstream ())); String msg =NULL; while(msg = Br.readline ())! =NULL) System. out. println (msg); }Catch(IOException e)                  {E.printstacktrace ();      }              }          }; }  }

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Simple demo of thread pool