Multi-person chat room realized by multithreading +socket

Recently in the Learning Multi-threading plan to do a simple multi-threaded Socke chat program, the results found that the code on the Internet does not have a complete implementation function, so I realized a demo:

The demo function is basically, there is a server responsible for information forwarding, multiple clients send messages, when a client sends a message, other clients can be accepted.

Service side:

Client:

Client code:

 Packagecom.cky.client;Importjava.io.IOException;ImportJava.io.InputStream;ImportJava.io.PrintWriter;ImportJava.net.Socket;Importjava.net.UnknownHostException;ImportJava.util.Scanner; Public classClient {PrivatePrintWriter out; //private BufferedReader BR;    PrivateScanner Scan; PrivateBoolean flag=true; PrivateSocket S; PrivateInputStream is;  PublicClient ()throwsUnknownhostexception, IOException {s=NewSocket ("127.0.0.1", 5001); is=S.getinputstream (); }         Public Static voidMain (String []args)throwsUnknownhostexception, IOException {client client=NewClient ();    Client.startup (); }     Public voidStartup ()throwsunknownhostexception, IOException { out=NewPrintWriter (S.getoutputstream (),true); //open a thread to listen for messages on the serverThread ct=NewThread (NewRunnable () {@Override Public voidrun () { while(true) {                    if(!flag) Break; Try{receive (); } Catch(IOException e) {//TODO auto-generated Catch blockE.printstacktrace ();        }                }            }        });        Ct.start (); //The main thread is responsible for sending messagesSystem.out.println ("Please enter your user name:"); Scan=NewScanner (system.in); String name=Scan.nextline ();        OUT.PRINTLN (name); SYSTEM.OUT.PRINTLN (Name+ ", welcome to the chat room, enter quit Quit");  while(flag) {String Read=Scan.nextline (); if(Read.equalsignorecase ("Quit") ) {flag=false; }            //System.out.println (read);out.println (read);    } s.close (); }         Public voidReceive ()throwsIOException {bytess[]=New byte[1024]; intLength=S.getinputstream (). read (ss); System.out.println (NewString (ss,0, length)); }}

Service-Side code:

 PackageCom.cky.server;ImportJava.io.BufferedReader;Importjava.io.IOException;ImportJava.io.InputStreamReader;ImportJava.io.PrintWriter;ImportJava.net.ServerSocket;ImportJava.net.Socket;Importjava.util.ArrayList;Importjava.util.List; Public classServer {PrivateList<threadserver> clients=NewArraylist<threadserver>();  Public voidStartup ()throwsIOException {System.out.println ("Listening on port 5001"); ServerSocket SS=NewServerSocket (5001);  while(true) {Socket Socket=ss.accept (); System.out.println ("Discover new users"); Thread St=NewThread (Newthreadserver (socket));        St.start (); }    }         Public classThreadserverImplementsrunnable{Privatesocket socket; PrivateBufferedReader BR; PrivatePrintWriter out; PrivateString name; PrivateBoolean flag=true;  PublicThreadserver (Socket socket)throwsIOException { This. socket=socket; BR=NewBufferedReader (NewInputStreamReader (Socket.getinputstream ())); out=NewPrintWriter (Socket.getoutputstream (),true); String Str=Br.readline (); Name=str+ "[" +socket.getinetaddress (). Gethostaddress () + ":" +socket.getport () + "]"; SYSTEM.OUT.PRINTLN (Name+ "Join this chat room"); Send (name+ "Join this chat room"); Clients.add ( This); }        Private voidSend (String message) { for(Threadserver threadserver:clients) {System.out.println ("--Send Message to Thread" +threadserver.name+ ");                ThreadServer.out.print (message);            ThreadServer.out.flush (); }        }        Private voidReceive ()throwsIOException {String message;  while(flag=true) {Message=Br.readline (); if(Message.equalsignorecase ("Quit") {System.out.println ("User" +name+ "exited"); Out.println ("Quit");                    Out.flush (); Clients.remove ( This); Flag=false; } System.out.println (Name+":"+message); Send (name+":"+message); }} @Override Public voidrun () {Try {                 while(flag=true) {receive (); }            } Catch(IOException e) {e.printstacktrace (); }finally {                Try{socket.close (); } Catch(IOException e) {e.printstacktrace (); }            }        }    }         Public Static voidMain (String []args)throwsIOException {Server server=NewServer (); System.out.println ("Server Open");    Server.startup (); }    }

Start the server, listen to the port, and then use the client login to send the message.

Multi-person chat room realized by multithreading +socket