//cTCPChat.java import java.net.*; import java.io.*; class cTCPChat{ public static void main(String[] args) { Socket cl=null; BufferedReader inp=null,keyboard=null; PrintWriter outp=null; int pserver=3456; String ipserver="localhost"; String s; try{ //Tao socket va thiet lap ket noi toi server cl=new Socket(ipserver,pserver); //Tao luong nhap xuat cho socket inp=new BufferedReader(new InputStreamReader(cl.getInputStream())); outp=new PrintWriter(cl.getOutputStream(),true); //Luong nhap ky tu tu ban phim keyboard=new BufferedReader(new InputStreamReader(System.in)); //Doc chuoi tu ban phim while(true) { System.out.print("Sender:"); s=keyboard.readLine().trim(); //Gui chuoi s toi server outp.println(s); if(s.equalsIgnoreCase("quit")) break; System.out.print("Receiver:"); //doc ket qua tra ve tu server s=inp.readLine(); System.out.println(s); if(s.equalsIgnoreCase("quit")) break; } } catch(IOException e) { System.out.println(e); } } }

//sTCPChat.java import java.net.*; import java.io.*; class sTCPChat{ public static void main(String[] args) { ServerSocket svr=null; Socket cl=null; BufferedReader inp=null,keyboard=null; PrintWriter outp=null; String s; int pserver=3456; InetAddress addr; int pclient; try{ //Tao doi tuong ServerSocket svr=new ServerSocket(pserver); //Dat svr o trang thai "nghe", neu co tin hieu ket noi // tra ve socket cl cl=svr.accept(); //Tao luong nhap xuat cho cl inp=new BufferedReader(new InputStreamReader(cl.getInputStream())); outp=new PrintWriter(cl.getOutputStream(),true); keyboard=new BufferedReader(new InputStreamReader(System.in)); while(true) { System.out.print("Receiver:"); //doc ket qua tra ve tu server s=inp.readLine(); System.out.println(s); if(s.equalsIgnoreCase("quit")) break; System.out.print("Sender:"); s=keyboard.readLine().trim(); //Gui chuoi s toi server outp.println(s); if(s.equalsIgnoreCase("quit")) break;

} } catch(IOException e) { System.out.println(e); } } }