Java socket Programming--chat small case

A long time ago wrote the socket chat room, are almost forgotten, the impulse to write again.

Server-side:

 Packagecom.fancy;ImportJava.io.BufferedReader;Importjava.io.IOException;ImportJava.io.InputStream;ImportJava.io.InputStreamReader;ImportJava.io.OutputStream;ImportJava.io.PrintWriter;ImportJava.net.ServerSocket;ImportJava.net.Socket;ImportJava.util.HashMap;ImportJava.util.Map; Public classServer {Private intPort; PrivateServerSocket server; Privatemap<string,printwriter> clients =NewHashMap ();  PublicServer ()throwsIOException {Port= 10025; Server=NewServerSocket (port); System.out.println ("Successfully created server side!");    Startreceive (); }     Public voidStartreceive ()throwsioexception{ while(true) {Socket Socket=server.accept (); //inetaddress address = socket.getinetaddress ();ClientHandler handler =NewClientHandler (socket); NewThread (handler). Start (); }    }     Public voidsendmsg (String from,string str)throwsIOException { for(String k:clients.keyset ()) {if(K.equals (from)) {Continue; } printwriter PW=Clients.get (k);            Pw.println (str);        Pw.flush (); }    }    classClientHandlerImplementsrunnable{PrivateString Nickname; Privatesocket socket; PrivatePrintWriter PW;  PublicClientHandler (socket socket) { This. Socket =socket; } @Override Public voidrun () {BufferedReader br=NULL; Try{InputStream in=Socket.getinputstream (); BR=NewBufferedReader (NewInputStreamReader (in)); OutputStream out=Socket.getoutputstream (); PW=NewPrintWriter (out,true); String name=Br.readline ();  This. Nickname =name; if(!Clients.containskey (name))                    {clients.put (name, PW); Pw.println ("Welcome new friends:" +name+ ", Current online number:" +clients.size ());                } String str;  while(str = br.readline ())! =NULL){                    if("Exit". Equalsignorecase (Str.trim ())) {Clients.remove ( This. Nickname);  This. Socket.close (); Sendmsg ("All", This. nickname+ "offline, current online number:" +clients.size ()); }Else{sendmsg (name,name+ ":" +str); }                }            } Catch(Exception e) {e.printstacktrace (); } finally{                Try{br.close (); } Catch(IOException e) {}}} }     Public Static voidMain (string[] args) {Try{Server s=NewServer (); } Catch(IOException e) {e.printstacktrace (); }    }}

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Client:

 Packagecom.fancy;ImportJava.io.BufferedReader;Importjava.io.IOException;ImportJava.io.InputStream;ImportJava.io.InputStreamReader;ImportJava.io.OutputStream;ImportJava.io.PrintWriter;ImportJava.net.Socket;Importjava.net.UnknownHostException;ImportJava.util.Scanner; Public classClient {Privatesocket socket; Private BooleanOnline =true;  PublicClient ()throwsunknownhostexception, IOException {socket=NewSocket ("127.0.0.1", 10025); OutputStream out=Socket.getoutputstream (); PrintWriter PW=NewPrintWriter (out,true); Scanner Scan=NewScanner (system.in);        String Word; Serverhandler hander=NewServerhandler (); NewThread (hander). Start (); System.out.println ("Please enter your nickname:"); Word=Scan.nextline ();        PW.PRINTLN (word);        Pw.flush ();  while((Word=scan.nextline ())! =NULL) {pw.println (word);            Pw.flush (); if("Exit". Equalsignorecase (word)) {Online=false;  Break; }        }    }    classServerhandlerImplementsrunnable{@Override Public voidrun () { while(online) {InputStream in; Try{ in=Socket.getinputstream (); BufferedReader BR=NewBufferedReader (NewInputStreamReader (in)); String Back=Br.readline ();                System.out.println (back); } Catch(IOException e) {e.printstacktrace (); }            }        }    }     Public Static voidMain (string[] args) {Try{Client C=NewClient (); System.out.println ("Started!"); } Catch(unknownhostexception e) {e.printstacktrace (); } Catch(IOException e) {e.printstacktrace (); }            }}

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Run the server one time, the results of multiple clients are as follows:

　　

Java socket Programming--chat small case