Java multi-client chat program implementation program

The code is as follows:

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Import java. io .*; Import java.net .*; Import java. util .*; Public class HeartServer {      /* * Member variable debut */ List <ClientThread> clients = new ArrayList <ClientThread> ();     /** * This is the portal. Check it out here... * @ Param args */ Public static void main (String [] args ){ New HeartServer (). start ();     }     /** * Starting the server...      * */ Public void start (){ Try { Boolean iConnect = false; ServerSocket ss = new ServerSocket (1720 ); IConnect = true; While (iConnect ){ System. out. println ("server port bound successfully! "); Socket s = ss. accept (); ClientThread currentClient = new ClientThread (s); // create a thread reference System. out. println ("client found! "); Clients. add (currentClient); // add the current client to the set New Thread (currentClient). start (); System. out. println ("The client process has been started! ");             } } Catch (IOException e ){ System. out. println ("IOException "); E. printStackTrace ();         }     }     /** * Leave a home address for each client (client process)      * */ Class ClientThread implements Runnable { /* * The member variable is coming again... */ Private Socket s; Private DataInputStream dis; Private DataOutputStream dos; Private String str; Private boolean iConnect = false;         /** * Minor structure */ ClientThread (Socket s ){ This. s = s; IConnect = true;         }         Public void run (){ System. out. println ("run method started! "); Try {                 While (iConnect ){ System. out. println ("the while loop in the RUN method starts, waiting for the client to send a message ..."); Dis = new DataInputStream (s. getInputStream ()); Str = dis. readUTF (); System. out. println (str ); For (int I = 0; I <clients. size (); I ++ ){ System. out. println ("forwarding messages..." + I ); ClientThread c = clients. get (I ); C. sendMsg (str );                     }                 } } Catch (IOException e ){ E. printStackTrace ();             }                     }         /** * Forward messages. I am the master... * Send messages sent to the server to each connected client. */ Public void sendMsg (String str ){ Try { System. out. println ("create an output pipeline! "); Dos = new DataOutputStream (this. s. getOutputStream ()); System. out. println ("The message is being written to the client! "); Dos. writeUTF (str ); System. out. println ("The message is successfully written to the client! "); } Catch (IOException e ){ E. printStackTrace ();             }                     }             }     }

Program

The code is as follows:

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Import java. awt .*; Import java. awt. event .*; Import java. io .*; Import java. lang .*; Import java.net .*; Public class HeartClient extends Frame { /* * Member method appearance... */ Private TextField tfText; Private TextArea taContent; Private Socket s; Private DataOutputStream dos; Private DataInputStream dis;     /** * Note: The entry... ^ * @ Param args */ Public static void main (String [] args ){ New HeartClient (). launchFrame ();             }     /** * Loading GU */ Public void launchFrame (){ TfText = new TextField (); TaContent = new TextArea (); This. setSize (300,300 ); This. setLocation (300,300 ); This. tfText. addActionListener (new TFListener ()); This. add (tfText, BorderLayout. SOUTH ); This. add (taContent, BorderLayout. NORTH ); This. addWindowListener (new WindowAdapter (){ @ Override Public void windowClosing (WindowEvent e ){ System. exit (0 ); }}); This. pack (); This. connect (); This. setVisible (true );     } /** * I am trying to connect to the server... */ Public void connect (){ Try { S = new Socket ("127.0.0.1", 1720 ); Dos = new DataOutputStream (s. getOutputStream ()); Dis = new DataInputStream (s. getInputStream ()); New Thread (new SendThread (). start (); // Dos. writeUTF ("Hello, I find u! "); } Catch (UnknownHostException e ){ System. out. println ("UnknownHostException "); E. printStackTrace (); } Catch (IOException e ){ System. out. println ("IOException "); E. printStackTrace (); } Finally { // Disable Donnie...         }             } /** * Don't wait for tfText (the listener class of TextField tfText) */ Class TFListener implements ActionListener { Private String str; @ Override Public void actionreceivmed (ActionEvent e ){ Str = tfText. getText (). trim (); TfText. setText (""); Try { Dos. writeUTF (str ); } Catch (IOException e1 ){ System. out. println ("IOException "); E1.printStackTrace ();             }         }             }     /** * The thread in which the client receives messages...      * */ Class SendThread implements Runnable { Private String str; Private boolean iConnect = false;         Public void run (){ IConnect = true; RecMsg ();                     }         /** * Message, look at moves, where to run... (implementation of the client to receive messages) * @ Throws IOException */ Public void recMsg (){ Try { While (iConnect ){ Str = dis. readUTF (); TaContent. setText (str );                 } } Catch (IOException e ){ E. printStackTrace ();             }                     }             }     }