Java multithread Implementation chat client and server _java

This example for you to share the Java Chat Room code, for your reference, the specific contents are as follows

Mainly involved in knowledge

· Java GUI program writing, including event monitoring mechanism.
· Java network communication Programming, the use of serversocket,socket classes.
· Multi-Threading Programming in Java, Thread class, the use of runnable interfaces.

Source

Client

Package Project1; 
Import java.awt.*; 
Import java.awt.event.*; 
Import java.io.*; 
 
Import java.net.*; 
 
Import javax.swing.*; 
 public class Client {private JFrame clientframe; 
 Private JLabel Iplabel; 
 Private JLabel Portlabel; 
 Private JLabel Saylabel; 
 Private JLabel Nicknamelabel; 
 Private JTextField Iptext; 
 Private JTextField Porttext; 
 Private JTextField Nicknametext; 
 Private JTextField Saytext; 
 Private JButton Connectbutton; 
 Private JButton Nicknamebutton; 
 Private JButton Saybutton; 
 Private JPanel Jpanelnorth; 
 Private JPanel JPanelSouth0; 
 Private JPanel jPanelSouth1; 
 Private JPanel jPanelSouth2; 
 Private JTextArea Clienttextarea; 
 Private JScrollPane scroller; 
 Private BufferedReader reader; 
 Private PrintWriter writer; 
 
 Private String nickname; 
  public static void Main (String args[]) {Client aclient = new Client (); 
 Aclient.startup (); 
 
  }//Initialize Component public client () {nickname = "client"; 
  Clientframe = new JFrame (); JpanElnorth = new JPanel (); 
  Iplabel = new JLabel ("Server IP", jlabel.left); 
  Iptext = new JTextField (10); 
  Portlabel = new JLabel ("Server Port", jlabel.left); 
  Porttext = new JTextField (10); 
  Connectbutton = new JButton ("Connection"); 
  Clienttextarea = new JTextArea (); 
  Scroller = new JScrollPane (Clienttextarea); 
  JPanelSouth0 = new JPanel (); 
  JPanelSouth1 = new JPanel (); 
  JPanelSouth2 = new JPanel (); 
  Nicknamelabel = new JLabel ("nickname", Jlabel.left); 
  Nicknametext = new JTextField (nickname, 30); 
  Nicknamebutton = new JButton ("Confirm"); 
  Saylabel = new JLabel ("message", Jlabel.left); 
  Saytext = new JTextField (30); 
 Saybutton = new JButton ("Confirm"); 
  ///Build GUI private void Buildgui () {//Window settings Clientframe.settitle ("Client"); 
  Clientframe.setdefaultcloseoperation (Jframe.exit_on_close); 
 
  Clientframe.setsize (550, 550); 
  North of the Component Jpanelnorth.add (Iplabel); 
  Jpanelnorth.add (Iptext); 
  Jpanelnorth.add (Portlabel); 
  Jpanelnorth.add (Porttext); Jpanelnorth.add (connectbutton); 
 
  Clientframe.getcontentpane (). Add (Borderlayout.north, Jpanelnorth); 
  The middle component clienttextarea.setfocusable (false); 
  Scroller.setverticalscrollbarpolicy (scrollpaneconstants.vertical_scrollbar_always); 
  Scroller.sethorizontalscrollbarpolicy (Scrollpaneconstants.horizontal_scrollbar_never); 
 
  Clientframe.getcontentpane (). Add (Borderlayout.center, scroller); 
  The Southern Component Jpanelsouth1.add (Nicknamelabel); 
  Jpanelsouth1.add (Nicknametext); 
  Jpanelsouth1.add (Nicknamebutton); 
  Jpanelsouth2.add (Saylabel); 
  Jpanelsouth2.add (Saytext); 
  Jpanelsouth2.add (Saybutton); 
  Jpanelsouth0.setlayout (New BoxLayout (JPanelSouth0, Boxlayout.y_axis)); 
  Jpanelsouth0.add (JPANELSOUTH1); 
  Jpanelsouth0.add (JPANELSOUTH2); 
 
  Clientframe.getcontentpane (). Add (Borderlayout.south, JPanelSouth0); 
 The Set window is visible clientframe.setvisible (true); 
 
  //client runs public void StartUp () {Buildgui (); The thread that received the server message Runnable Incomingreader = new Runnable () {@Override publicvoid Run () {String message; 
     try {while (message = Reader.readline ())!= null) {clienttextarea.append (message + "\ n"); 
    } catch (Exception ex) {ex.printstacktrace (); 
 
  } 
   } 
  }; Monitor the Connect button to implement the server's connection Connectbutton.addactionlistener (new ActionListener () {@Override public void Actionperf 
    Ormed (ActionEvent e) {String Aserverip = Iptext.gettext (); 
 
    String Aserverport = Porttext.gettext (); if (Aserverip.equals ("") | | Aserverport.equals ("")) {Joptionpane.showmessagedialog (clientframe, "Please enter the full IP and port!") 
    "); else {try {@SuppressWarnings ("resource") socket Clientsocket = new socket (Aserverip, Integer.parse 
      Int (Aserverport)); 
      InputStreamReader StreamReader = new InputStreamReader (Clientsocket.getinputstream ()); 
      reader = new BufferedReader (StreamReader); 
 
      writer = new PrintWriter (Clientsocket.getoutputstream ()); 
Clienttextarea.append ("server is connected ... \ n"); 
      Thread readerthread = new Thread (incomingreader); 
     Readerthread.start (); The catch (Exception ex) {Joptionpane.showmessagedialog (clientframe) is not connected to the server!\n verify that the IP and port inputs are correct. 
     "); 
 
  } 
    } 
   } 
  }); Monitor nickname, set nickname ActionListener Nicknamelistener = new ActionListener () {@Override public void Actionperform 
    Ed (ActionEvent e) {String atext = Nicknametext.gettext (); 
    if (!atext.equals ("")) {nickname = Atext; 
  } 
   } 
  }; 
  Nicknamebutton.addactionlistener (Nicknamelistener); 
  Nicknametext.addactionlistener (Nicknamelistener); 
 
   Nicknametext.addfocuslistener (New Focuslistener () {@Override public void focusgained (FocusEvent e) {} 
    @Override public void Focuslost (FocusEvent e) {String atext = Nicknametext.gettext (); 
    if (!atext.equals ("")) {nickname = Atext; 
 
  } 
   } 
  }); Send message to server ActionListener Saylistener = new ActionListener () {@Override public void actIonperformed (ActionEvent e) {String atext = Saytext.gettext (); if (Atext.equals (")) {Joptionpane.showmessagedialog (clientframe," content cannot be empty!) 
    "); 
      else {try {writer.println (nickname + ":" + atext); 
     Writer.flush (); 
     catch (Exception ex) {ex.printstacktrace (); 
    } saytext.settext (""); 
  } 
   } 
  }; 
  Saybutton.addactionlistener (Saylistener); 
 
 Saytext.addactionlistener (Saylistener); 

 } 
 
}

Server

Package Project1; 
Import java.awt.*; 
Import java.awt.event.*; 
Import java.io.*; 
Import java.net.*; 
Import java.util.ArrayList; 
Import Java.util.Iterator; 
 
Import javax.swing.*; 
 public class Server {private JFrame serverframe; 
 Private JLabel Portlabel; 
 Private JLabel Saylabel; 
 Private JLabel Nicknamelabel; 
 Private JTextField Porttext; 
 Private JTextField Saytext; 
 Private JTextField Nicknametext; 
 Private JButton Startbutton; 
 Private JButton Saybutton; 
 Private JButton Nicknamebutton; 
 Private JPanel Jpanelnorth; 
 Private JPanel JPanelSouth0; 
 Private JPanel jPanelSouth1; 
 Private JPanel jPanelSouth2; 
 Private JScrollPane scroller; 
 Private JTextArea Servertextarea; 
 Private arraylist<printwriter> Clientoutputstreams; 
 
 Private String nickname; 
  public static void Main (string[] args) {Server aserver = new server (); 
 Aserver.startup (); 
 
  }//Initialize Component Public server () {nickname = "Server"; 
  Serverframe = new JFrame (); Jpanelnorth = new JPanel (); 
  Portlabel = new JLabel ("Port", jlabel.left); 
  Porttext = new JTextField (30); 
  Startbutton = new JButton ("Start"); 
  Servertextarea = new JTextArea (); 
  Scroller = new JScrollPane (Servertextarea); 
  Nicknamelabel = new JLabel ("nickname", Jlabel.left); 
  Nicknametext = new JTextField (nickname, 30); 
  Nicknamebutton = new JButton ("Confirm"); 
  JPanelSouth0 = new JPanel (); 
  JPanelSouth1 = new JPanel (); 
  JPanelSouth2 = new JPanel (); 
  Saylabel = new JLabel ("message", Jlabel.left); 
  Saytext = new JTextField (30); 
 Saybutton = new JButton ("Confirm"); 
  ///Build GUI private void Buildgui () {//Window settings serverframe.settitle ("Server"); 
  Serverframe.setdefaultcloseoperation (Jframe.exit_on_close); 
 
  Serverframe.setsize (550, 550); 
  North of the Component Jpanelnorth.add (Portlabel); 
  Jpanelnorth.add (Porttext); 
  Jpanelnorth.add (Startbutton); 
 
  Serverframe.getcontentpane (). Add (Borderlayout.north, Jpanelnorth); 
  The middle component servertextarea.setfocusable (false); Scroller.setvertIcalscrollbarpolicy (scrollpaneconstants.vertical_scrollbar_always); 
  Scroller.sethorizontalscrollbarpolicy (Scrollpaneconstants.horizontal_scrollbar_never); 
 
  Serverframe.getcontentpane (). Add (Borderlayout.center, scroller); 
  The Southern Component Jpanelsouth1.add (Nicknamelabel); 
  Jpanelsouth1.add (Nicknametext); 
  Jpanelsouth1.add (Nicknamebutton); 
  Jpanelsouth2.add (Saylabel); 
  Jpanelsouth2.add (Saytext); 
  Jpanelsouth2.add (Saybutton); 
  Jpanelsouth0.setlayout (New BoxLayout (JPanelSouth0, Boxlayout.y_axis)); 
  Jpanelsouth0.add (JPANELSOUTH1); 
  Jpanelsouth0.add (JPANELSOUTH2); 
 
  Serverframe.getcontentpane (). Add (Borderlayout.south, JPanelSouth0); 
 The Set window is visible serverframe.setvisible (true); 
 
  }//server running public void StartUp () {Buildgui (); Monitor the Start button to establish the port ActionListener Startlistener = new ActionListener () {@Override public void actionperformed (A 
    Ctionevent e) {clientoutputstreams = new arraylist<printwriter> (); String Aport = Porttext.getText (); if (Aport.equals (")) {Joptionpane.showmessagedialog (serverframe, please enter the correct port number!) 
    "); ' Else {try {//thread waiting for client to connect Runnable serverrunnable = new Runnable () {@Override Publ 
        IC void Run () {ServerSocket serversocket; 
         try {serversocket = new ServerSocket (Integer.parseint (Aport)); 
         Servertextarea.append ("Waiting for client to connect ... \ n"); 
          while (true) {Socket clientsocket = serversocket.accept (); 
 
          Servertextarea.append ("Client connected ... \ n"); 
          PrintWriter writer = new PrintWriter (Clientsocket.getoutputstream ()); 
 
          Clientoutputstreams.add (writer); 
          Thread t = new Thread (new ClientHandler (Clientsocket)); 
         T.start (); catch (NumberFormatException | 
        IOException e) {e.printstacktrace (); 
      } 
       } 
      }; 
      Thread serverthread = new Thread (serverrunnable); 
     Serverthread.start (); catch (ExCeption ex) {ex.printstacktrace (); 
  } 
    } 
   } 
  }; 
  Startbutton.addactionlistener (Startlistener); 
 
  Porttext.addactionlistener (Startlistener); Monitor nickname, set nickname ActionListener Nicknamelistener = new ActionListener () {@Override public void Actionperform 
    Ed (ActionEvent e) {String atext = Nicknametext.gettext (); 
    if (!atext.equals ("")) {nickname = Atext; 
  } 
   } 
  }; 
  Nicknamebutton.addactionlistener (Nicknamelistener); 
  Nicknametext.addactionlistener (Nicknamelistener); 
 
   Nicknametext.addfocuslistener (New Focuslistener () {@Override public void focusgained (FocusEvent e) {} 
    @Override public void Focuslost (FocusEvent e) {String atext = Nicknametext.gettext (); 
    if (!atext.equals ("")) {nickname = Atext; 
 
  } 
   } 
  }); Listen for say button, send message ActionListener Saylistener = new ActionListener () {@Override public void actionperformed (actio Nevent e) {String atext = saytext.gEttext (); 
     if (!atext.equals ("")) {atext = nickname + ":" + atext; 
     Sendtoeveryclient (Atext); 
     Servertextarea.append (atext + "\ n"); 
    Saytext.settext (""); else {Joptionpane.showmessagedialog (serverframe, "content cannot be empty!) 
    "); 
  } 
   } 
  }; 
  Saybutton.addactionlistener (Saylistener); 
 Saytext.addactionlistener (Saylistener); 
  }//Multi-client thread public class ClientHandler implements Runnable {BufferedReader breader; 
 
  Socket Asocket; 
    Public ClientHandler (Socket clientsocket) {try {asocket = Clientsocket; 
    InputStreamReader Isreader = new InputStreamReader (Asocket.getinputstream ()); 
   Breader = new BufferedReader (Isreader); 
   catch (Exception ex) {ex.printstacktrace (); 
   @Override public void Run () {String message; 
     try {while (message = Breader.readline ())!= null) {sendtoeveryclient (message); 
    Servertextarea.append (message + "\ n"); 
 } catch (Exception ex) {   Ex.printstacktrace (); }}//Send message to all clients private void sendtoeveryclient (String message) {iterator<printwriter> it = CLI 
  Entoutputstreams.iterator (); 
    while (It.hasnext ()) {try {printwriter writer = (PrintWriter) it.next (); 
    WRITER.PRINTLN (message); 
   Writer.flush (); 
   catch (Exception ex) {ex.printstacktrace (); 
 } 
  } 
 } 
 
}

GUI Run screenshot:

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