Chat Room applets,

Chat Room applets,
Chat Room applets

Ideas:

Server:

1. The server first needs to instantiate a serversocket to wait for the client connection.

2. After the client connects, it obtains the input and output streams of the socket, reads the data sent by the client, and sends the data to each client connected to the server.

Client:

1. instantiate the server connected to the socket

2. Data is written when information is sent and then received from the server.

3. Close the data input/output stream and socket when disconnected

Server code:

1 public class Server extends JFrame {2/** 3*4 */5 private static final long serialVersionUID = 1L; 6 private ServerSocket ss = null; 7 private boolean bStart = false; 8 9 private JTextArea taContent = new JTextArea (); 10 11 private int index = 0; // number of connected clients 12 13 List <Client> clients = new ArrayList <Client> (); // stores Client objects 14 15 public void launchFrame () {// process Frame 16 taContent. setEditable (fals E); // set the text field to 17 18 taContent. setBackground (Color. DARK_GRAY); 19 taContent. setForeground (Color. YELLOW); 20 this. add (taContent); 21 this. setSize (300,350); 22 this. setLocation (400,200); 23 this. setTitle ("TCP Server"); 24 this. setVisible (true); 25 this. setdefaclocloseoperation (JFrame. EXIT_ON_CLOSE); 26 tcpMonitor (); 27} 28 29 public void tcpMonitor () {30 try {31 ss = new ServerSocket (8888 );// Instantiate serversocket and wait for the client to connect 32 bStart = true; 33} catch (IOException e) {34 35 e. printStackTrace (); 36} 37 38 try {39 while (bStart) {40 index ++; 41 Socket s = ss. accept (); 42 Client c = new Client (s); // get the input/output stream 43 clients of the socket while instantiating the object. add (c); 44 45 taContent. append (s. getInetAddress (). getHostAddress () 46 + "connected" + index + "clients \ n"); 47 new Thread (c ). start (); 48 49} 50} catch (IOExcepti On e) {51 e. printStackTrace (); 52} finally {53 try {54 ss. close (); 55} catch (IOException e) {56 57 e. printStackTrace (); 58} 59} 60 61} 62 63 public static void main (String args []) {64 Server ts = new Server (); 65 ts. launchFrame (); 66} 67 68 private class Client implements Runnable {69 DataInputStream dis = null; 70 DataOutputStream dos = null; 71 72 Socket s = null; 73 boolean bStart = False; 74 75 Client (Socket s) {76 this. s = s; 77 try {78 dis = new DataInputStream (s. getInputStream (); 79 dos = new DataOutputStream (s. getOutputStream (); 80} catch (IOException e) {81 e. printStackTrace (); 82} 83 84 bStart = true; 85} 86 87 public void sendToEveryClient (String str) {88 try {89 dos. writeUTF (str); 90 dos. flush (); 91 92} catch (IOException e) {93 index --; 94 clients. remo Ve (this); 95 taContent. append (s. getInetAddress (). getHostAddress () 96 + "exited" + index + "clients \ n"); 97 System. out. println ("the other party exits! I removed it from the List! "); 98} 99} 100 101 public void run () {102 try {103 while (bStart) {104 String str = dis. readUTF (); 105 System. out. println (str); 106 for (int I = 0; I <clients. size (); I ++) {107 Client c = clients. get (I); 108 c. sendToEveryClient (str); 109} 110} 111} catch (EOFException e) {112 clients. remove (this); 113 taContent. append (s. getInetAddress (). getHostAddress () 114 + "exited" + clients. size () + "clients \ n ); 115 System. out. println ("client closed"); 116} catch (SocketException e) {117 System. out. println ("client closed"); 118} catch (IOException e) {119 e. printStackTrace (); 120} finally {121 try {122 if (s! = Null) 123 s. close (); 124 if (dis! = Null) 125 dis. close (); 126 if (dos! = Null) 127 dos. close (); 128} catch (IOException e) {129 e. printStackTrace (); 130} 131} 132} 133 134} 135 136}

Client code:

1 public class Client extends JFrame {2/** 3*4 */5 private static final long serialVersionUID = 1L; 6 TextArea taContent = new TextArea (); 7 JTextField tfTxt = new JTextField (20); 8 9 JButton send = new JButton ("send"); 10 JButton connect = new JButton ("connect "); 11 JButton clear = new JButton ("clear"); 12 13 boolean live = false; 14 JPanel p1 = new JPanel (); 15 JPanel p2 = new JPanel (); 16 17 Socket s = Null; 18 DataOutputStream dos = null; 19 DataInputStream dis = null; 20 21 boolean bConnected = false; 22 23 Thread t = new Thread (new RecToServer ()); // receive data from the server 24 25 public void launchFrame () {26 27 taContent. setEditable (false); 28 29 p2.setLayout (new FlowLayout (FlowLayout. CENTER, 10, 5); 30 p2.add (send); 31 p2.add (connect); 32 p2.add (clear); 33 34 Container con = this. getContentPane (); 35 36 con. add (taContent, "North"); 37 con. add (tfTxt, "Center"); 38 con. add (p2, "South"); 39 40 this. set size (300,350); 41 this. setLocation (400,200); 42 this. setTitle ("Chat Client"); 43 44 this. setVisible (true); 45 this. setdefaclocloseoperation (JFrame. EXIT_ON_CLOSE); 46 47 connect. addActionListener (new Connect (); 48 send. addActionListener (new SendMsg (); 49 clear. addActionListener (new ActionListene R () {50 public void actionreceivmed (ActionEvent e) {51 taContent. setText (""); 52} 53}); 54} 55 56 public void connectToServer () {57 try {58 59 s = new Socket ("127.0.0.1", 8888 ); 60 dos = new DataOutputStream (s. getOutputStream (); 61 dis = new DataInputStream (s. getInputStream (); 62 63 bConnected = true; 64 65} catch (BindException e) {66 System. out. println ("the specified server cannot be found"); 67} catch (Unknow NHostException e) {68 // TODO Auto-generated catch block 69 e. printStackTrace (); 70} catch (IOException e) {71 // TODO Auto-generated catch block 72 e. printStackTrace (); 73} 74 75} 76 77 public void disConnect () {78 try {79 if (s! = Null) {80 s. close (); 81} 82 83 if (dos! = Null) {84 dos. close (); 85} 86 if (dis! = Null) {87 dis. close (); 88} 89} catch (IOException e) {90 e. printStackTrace (); 91} 92} 93 94 public static void main (String args []) {95 Client tc = new Client (); 96 tc. launchFrame (); 97} 98 99 private class Connect implements ActionListener {100 public void actionreceivmed (ActionEvent e) {101 if (e. getActionCommand () = "connection") {102 103 connectToServer (); 104 try {105 t. start (); 106} catch (IllegalThreadStateException ex) {107 108} 109 connect. setText ("disconnected"); 111 112} else if (e. getActionCommand () = "disconnected") {113 disConnect (); 114 connect. setText ("connection"); 115} 116 117} 118} 119 120 private class SendMsg implements ActionListener {121 public void actionreceivmed (ActionEvent e) {122 if (connect. getActionCommand () = "connection") {123 JOptionPane. showMessageDialog (Client. this, 124 "the specified server is not found", "error message", 1); 125} else {126 String str = tfTxt. getText (); 127 tfTxt. setText (""); 128 129 try {130 dos. writeUTF (str); 131 dos. flush (); 132} catch (SocketException ex) {133 System. out. println ("the specified server is not found"); 134 JOptionPane. showMessageDialog (Client. this, 135 "the specified server is not found", "error message", 1); 136} catch (IOException ex) {137 ex. printStackTrace (); 138} 139} 140 141} 142} 143 144 private class RecToServer implements Runnable {145 public void run () {146 try {147 while (bConnected) {148 String str = dis. readUTF (); 149 // System. out. println (str); 150 151 taContent. append (str + "\ n"); 152} 153} catch (SocketException e) {154 System. out. println ("Server Disabled"); 155} catch (IOException e) {156 e. printStackTrace (); 157} 158} 159} 160}

Result: