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This article introduces the relevant knowledge of "how to implement a simple chat program based on Java based on TCP". Many people will encounter this dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

First, how to realize TCP communication

To realize TCP communication, we need to create a server-side program and a client-side program. In order to ensure the security of data transmission, we first need to implement the server-side program, and then write the client-side program.

Run the server program on the local machine and the client program on the remote computer

The IP address of this machine: 192.168.129.222

The IP address of the remote machine: 192.168.214.213

Second, write Cramp S architecture chat program 1. Write server-side programs-Server.java

Create a Server class in the net.hw.network package

Package net.hw.network;import javax.swing.*;import java.awt.*;import java.awt.event.*;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.IOException;import java.net.ServerSocket;import java.net.Socket;/** * function: server side * author: Huawei * date: March 18, 2022 * / public class Server extends JFrame {static final int PORT = 8136 Static final String HOST_IP = "192.168.129.222"; private JPanel panel1, panel2; private JTextArea txtContent, txtInput, txtInputIP; private JScrollPane panContent, panInput; private JButton btnClose, btnSend; private ServerSocket serverSocket; private Socket socket; private DataInputStream netIn; private DataOutputStream netOut; public static void main (String [] args) {new Server ();} public Server () {super ("server") / / create components panel1 = new JPanel (); panel2 = new JPanel (); txtContent = new JTextArea (15,60); txtInput = new JTextArea (3,60); panContent = new JScrollPane (txtContent, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER); panInput = new JScrollPane (txtInput, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER) BtnClose = new JButton ("off"); btnSend = new JButton ("send"); / / add components getContentPane () .add (panContent, "Center"); getContentPane () .add (panel1, "South"); panel1.setLayout (new GridLayout (0,1)); panel1.add (panInput); panel1.add (panel2); panel2.add (btnSend) Panel2.add (btnClose); / / set component properties txtContent.setEditable (false); txtContent.setFont (new Font (Song style, Font.PLAIN, 13)); txtInput.setFont (new Font (Song style, Font.PLAIN, 15)); txtContent.setLineWrap (true); txtInput.setLineWrap (true); txtInput.requestFocus (); setSize (450350) SetLocation (50,200); setResizable (false); setVisible (true); / / waiting for customer request try {txtContent.append ("Server started.\ n"); serverSocket = new ServerSocket (PORT); txtContent.append ("waiting for customer request.\ n"); socket = serverSocket.accept () TxtContent.append ("connect a customer." \ n "+ socket +"\ n "); netIn = new DataInputStream (socket.getInputStream ()); netOut = new DataOutputStream (socket.getOutputStream ());} catch (IOException E1) {e1.printStackTrace () Register the listener and write the event code txtContent.addMouseMotionListener (new MouseMotionAdapter () {public void mouseMoved (MouseEvent e) {displayClientMsg ();}}); txtInput.addMouseMotionListener (new MouseMotionAdapter () {public void mouseMoved (MouseEvent e) {displayClientMsg ()) ); panel2.addMouseMotionListener (new MouseMotionAdapter () {public void mouseMoved (MouseEvent e) {displayClientMsg ();}}); txtInput.addKeyListener (new KeyAdapter () {public void keyTyped (KeyEvent e) {displayClientMsg ();}}) TxtInput.addFocusListener (new FocusAdapter () {public void focusGained (FocusEvent e) {displayClientMsg ();}}); btnSend.addActionListener (new ActionListener () {public void actionPerformed (ActionEvent e) {try {String serverMsg = txtInput.getText ()) If (! serverMsg.trim (). Equals (")) {txtContent.append (" Server > "+ serverMsg +"\ n "); netOut.writeUTF (serverMsg);} else {JOptionPane.showMessageDialog (null," cannot send empty message! " , "JOptionPane.WARNING_MESSAGE";} txtInput.setText ("); txtInput.requestFocus ();} catch (IOException ie) {ie.printStackTrace ();}) BtnClose.addActionListener (new ActionListener () {public void actionPerformed (ActionEvent arg0) {try {netIn.close (); netOut.close (); socket.close (); serverSocket.close ()) } catch (IOException e) {e.printStackTrace ();} System.exit (0);}}); addWindowListener (new WindowAdapter () {public void windowClosing (WindowEvent e) {try {netIn.close ()) NetOut.close (); socket.close (); serverSocket.close ();} catch (IOException ie) {ie.printStackTrace ();} System.exit (0) } public void windowActivated (WindowEvent e) {txtInput.requestFocus ();}});} / / display client information void displayClientMsg () {try {if (netIn.available () > 0) {String clientMsg = netIn.readUTF () TxtContent.append ("client >" + clientMsg + "\ n");}} catch (IOException E1) {e1.printStackTrace ();} 2. Write client programs-Client.java

Create a Client class in the net.hw.network package

Package net.hw.network;import javax.swing.*;import java.awt.*;import java.awt.event.*;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.IOException;import java.net.InetAddress;import java.net.Socket;/** * function: client * author: Huawei * date: March 18, 2022 * / public class Client extends JFrame {private JPanel panel1, panel2; private JTextArea txtContent, txtInput; private JScrollPane panContent, panInput Private JButton btnClose, btnSend; private Socket socket; private DataInputStream netIn; private DataOutputStream netOut; public static void main (String [] args) {new Client ();} public Client () {super ("client"); / / create component panel1 = new JPanel (); panel2 = new JPanel (); txtContent = new JTextArea (15,60) TxtInput = new JTextArea (3,60); panContent = new JScrollPane (txtContent, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER); panInput = new JScrollPane (txtInput, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER); btnClose = new JButton ("off"); btnSend = new JButton ("send"); / / add component getContentPane (). Add (panContent, "Center") GetContentPane () .add (panel1, "South"); panel1.setLayout (new GridLayout (0,1)); panel1.add (panInput); panel1.add (panel2); panel2.add (btnSend); panel2.add (btnClose); / / set component properties txtContent.setEditable (false); txtContent.setFont (new Font ("Verdana", Font.PLAIN, 13)) TxtInput.setFont (new Font, Font.PLAIN, 15); txtContent.setLineWrap (true); txtInput.setLineWrap (true); txtInput.requestFocus (); setSize (450,350); setLocation (550,200); setResizable (false); setVisible (true) / / connect to the server try {txtContent.append ("connect to the server.\ n"); socket = new Socket (Server.HOST_IP, Server.PORT); txtContent.append ("connect to the server successfully. \ n "+ socket +"\ n "); netIn = new DataInputStream (socket.getInputStream ()); netOut = new DataOutputStream (socket.getOutputStream ());} catch (IOException E1) {JOptionPane.showMessageDialog (null," Server connection failed! \ nPlease start the server program first! " , "client", JOptionPane.ERROR_MESSAGE); System.exit (1);} / register the listener and write the event code txtContent.addMouseMotionListener (new MouseMotionAdapter () {public void mouseMoved (MouseEvent e) {displayServerMsg ();}}) TxtInput.addMouseMotionListener (new MouseMotionAdapter () {public void mouseMoved (MouseEvent e) {displayServerMsg ();}}); panel2.addMouseMotionListener (new MouseMotionAdapter () {public void mouseMoved (MouseEvent e) {displayServerMsg ();}}) TxtInput.addKeyListener (new KeyAdapter () {public void keyTyped (KeyEvent e) {displayServerMsg ();}}); txtInput.addFocusListener (new FocusAdapter () {public void focusGained (FocusEvent e) {displayServerMsg ();}}) BtnSend.addActionListener (new ActionListener () {public void actionPerformed (ActionEvent e) {try {String clientMsg = txtInput.getText (); if (! clientMsg.trim (). Equals (")) {netOut.writeUTF (clientMsg)) TxtContent.append ("client >" + clientMsg + "\ n");} else {JOptionPane.showMessageDialog (null, "cannot send empty message!" , JOptionPane.WARNING_MESSAGE);} txtInput.setText ("); txtInput.requestFocus ();} catch (IOException ie) {ie.printStackTrace ();}) BtnClose.addActionListener (new ActionListener () {public void actionPerformed (ActionEvent e) {try {netIn.close (); netOut.close (); socket.close ();} catch (IOException ie) {ie.printStackTrace ()) } System.exit (0);}}); addWindowListener (new WindowAdapter () {public void windowClosing (WindowEvent e) {try {netIn.close (); netOut.close (); socket.close ()) } catch (IOException ie) {ie.printStackTrace ();} System.exit (0);} public void windowActivated (WindowEvent e) {txtInput.requestFocus ();}}) } / / display server information void displayServerMsg () {try {if (netIn.available () > 0) {String serverMsg = netIn.readUTF (); txtContent.append ("server >" + serverMsg + "\ n");}} catch (IOException E1) {e1.printStackTrace ();} 3. Test whether the server can communicate with the client

Start the server side on the local machine [192.168.129.222]

Start the client on the remote computer [192.168.214.213]

Show that the connection to the server [192.168.129.222] is successful. Switch to the server side to view, showing that a customer is connected [192.168.214.213].

At this point, the server and the client can communicate with each other.

4. The idea of program optimization-using multithreading on the server side

In fact, many server-side programs are allowed to be accessed by multiple applications, such as portals can be accessed by multiple users at the same time, so the server-side is multi-threaded.

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