java版两人聊天程序

server.java

 import java.io.*;
 import java.net.*;
 import java.text.SimpleDateFormat;
 import java.util.*;
 import java.awt.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;

 import javax.swing.*;

 @SuppressWarnings("serial")
 public class Server extends JFrame {
     DataInputStream inputFromClient;
     DataOutputStream outputToClient;
     // Button for send massage
     private JButton jbSend = new JButton("Send");
     // Text area for displaying contents
     private JTextArea jta = new JTextArea();
     // Text field for receiving radius
     private JTextField jtf = new JTextField();
     SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
     Date d = new Date();
     String time = format.format(d);

     public static void main(String[] args) {
         new Server();
     }

     public Server() {
         // Place text area on the frame
         setLayout(new BorderLayout());
         add(new JScrollPane(jta), BorderLayout.CENTER);
         JPanel p = new JPanel();
         p.setLayout(new BorderLayout());
         p.add(new JLabel("Message"), BorderLayout.WEST);
         p.add(jtf, BorderLayout.CENTER);
         jtf.setHorizontalAlignment(JTextField.LEFT);
         p.add(jbSend, BorderLayout.EAST);
         add(p, BorderLayout.SOUTH);
         jtf.addActionListener(new ButtonListener()); // Register listener
         jbSend.addActionListener(new ButtonListener()); // Register listener
         setTitle("Server");
         setSize(500, 300);
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         setVisible(true); // It is necessary to show the frame here!

         try {
             // Create a server socket
             ServerSocket serverSocket = new ServerSocket(8001);
             jta.append(" ***Server started at  " + time +"***"+ '\n');

             // Listen for a connection request
             Socket socket = serverSocket.accept();

             // Create data input and output streams
             inputFromClient = new DataInputStream(socket.getInputStream());
             outputToClient = new DataOutputStream(socket.getOutputStream());

             while (true) {
                 // Receive message from the client
                 String message = inputFromClient.readUTF();
                 jta.append(" " + time + '\n');
                 jta.append(" Message: " + message + '\n');
             }
         } catch (IOException ex) {
             jta.append(" ***端口已被占用!*** " + '\n');
         }
     }

     public class ButtonListener implements ActionListener {
         public void actionPerformed(ActionEvent e) {
             try {
                 // Get the message from the text field
                 String message = jtf.getText().trim();

                 // Send the radius to the server
                 outputToClient.writeUTF(message);
                 outputToClient.flush();

                 // Display to the text area
                 jta.append(" " + time + '\n');
                 jta.append(" MyMessage: " + message + "\n");
                 jtf.setText(null);
             } catch (IOException ex) {
                 System.err.println(ex);
             }
         }
     }

 }

client.java

 import java.io.*;
 import java.net.*;
 import java.text.SimpleDateFormat;
 import java.util.Date;
 import java.awt.*;
 import java.awt.event.*;
 import javax.swing.*;

 @SuppressWarnings("serial")
 public class Client extends JFrame {
     // Text field for receiving message
     private JTextField jtf = new JTextField();

     // Text area to display contents
     private JTextArea jta = new JTextArea();
     // Button for send massage
     private JButton jbSend = new JButton("Send");
     // IO streams
     private DataOutputStream toServer;
     private DataInputStream fromServer;
     SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
     Date d = new Date();
     String time = format.format(d);

     public static void main(String[] args) {
         new Client();
     }

     public Client() {
         // Panel p to hold the label and text field
         JPanel p = new JPanel();
         p.setLayout(new BorderLayout());
         p.add(new JLabel("Message"), BorderLayout.WEST);
         p.add(jtf, BorderLayout.CENTER);
         jtf.setHorizontalAlignment(JTextField.LEFT);
         p.add(jbSend, BorderLayout.EAST);
         setLayout(new BorderLayout());
         add(p, BorderLayout.SOUTH);
         add(new JScrollPane(jta), BorderLayout.CENTER);

         jtf.addActionListener(new ButtonListener()); // Register listener
         jbSend.addActionListener(new ButtonListener()); // Register listener

         setTitle("Client");
         setSize(500, 300);
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         setVisible(true); // It is necessary to show the frame here!

         try {
             // Create a socket to connect to the server
             Socket socket = new Socket("localhost", 8001);

             // Create an input stream to receive data from the server
             fromServer = new DataInputStream(socket.getInputStream());

             // Create an output stream to send data to the server
             toServer = new DataOutputStream(socket.getOutputStream());

             while (true) {
                 // Get message from the server
                 String message2 = fromServer.readUTF();
                 jta.append(" " + time + '\n');
                 jta.append(" Message: " + message2 + '\n');
             }
         } catch (IOException ex) {
             jta.append(" ***连接服务器失败!*** "+ '\n');
         }
     }

     public class ButtonListener implements ActionListener {
         public void actionPerformed(ActionEvent e) {
             try {
                 // Get the message from the text field
                 String message = jtf.getText().trim();

                 // Send the message to the server
                 toServer.writeUTF(message);
                 toServer.flush();

                 // Display to the text area
                 jta.append(" " + time + '\n');
                 jta.append(" MyMessage: " + message + "\n");
                 jtf.setText(null);
             } catch (IOException ex) {
                 System.err.println(ex);
             }
         }
     }
 }

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