Java版多人聊天室

server.java

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

 @SuppressWarnings("serial")
 public class Server extends JFrame {
     // Text area for displaying data
     private JTextArea jta = new JTextArea();
     ArrayList<Client> clients = new ArrayList<Client>();
     SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
     Date d = new Date();
     String time = format.format(d);
     // Statistics the number of clients
     int clientNo = 0;

     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);

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

         ServerSocket serverSocket = null;
         try {
             // Create a server socket
             serverSocket = new ServerSocket(2014);
         } catch (IOException ex) {
             jta.append(" ***端口已被占用!*** " + '\n');
         }
         jta.append(" ***服务器启动时间： " + time + "***" + '\n');

         while (true) {
             Socket socket = null;
             try {
                 // Listen for a connection request
                 socket = serverSocket.accept();
             } catch (IOException e) {
                 e.printStackTrace();
             }
             // To display client inetAddress
             InetAddress inetAddress = socket.getInetAddress();
             clientNo++;
             jta.append(" Client " + clientNo + '\n');
             jta.append(" Host name is " + inetAddress.getHostName() + '\n');
             jta.append(" IP Address is " + inetAddress.getHostAddress() + '\n');

             // Create a new Thread for client
             Client task = new Client(socket);
             clients.add(task);
             new Thread(task).start();
         }
     }

     class Client implements Runnable {
         Socket socket;
         // Create data input and output streams
         DataInputStream inputFromClient = null;
         DataOutputStream outputToClient = null;
         Client c = null;

         public Client(Socket socket) {
             this.socket = socket;
             try {
                 inputFromClient = new DataInputStream(socket.getInputStream());
             } catch (IOException e) {
                 e.printStackTrace();
             }
             try {
                 outputToClient = new DataOutputStream(socket.getOutputStream());
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }

         public void sentAll(String str) {
             try {
                 // Receive message from the client
                 outputToClient.writeUTF(str);
             } catch (SocketException e) {
                 if (c != null)
                     clients.remove(c);
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }

         public void run() {
             try {
                 while (true) {
                     // Receive sentence from the client
                     String sentence = inputFromClient.readUTF();
                     // Send sentence back to the client
                     for (int i = 0; i < clients.size(); i++) {
                         c = clients.get(i);
                         c.sentAll(sentence);
                     }

                     // Display to the text area
                     jta.append(" " + time + "\n");
                     jta.append(" " + sentence + '\n');
                 }
             } catch (IOException e) {
                 // e.printStackTrace();
                 clientNo--;
                 if (clientNo == 0) {
                     jta.append(" ***无客户端连接!***" + "\n");
                     clients.remove(c); // 防止新用户使用
                 } else {
                     jta.append(" ***退出一用户! 剩余用户: " + clientNo + "***" + "\n");
                 }
             }
         }
     }
 }

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 data
     private JTextField jtfName = new JTextField(); // Enter Name
     private JTextField jtfMessage = new JTextField(); // Enter Message

     // Text Area to display data
     private JTextArea jta = new JTextArea();

     // Button for send massage
     private JButton jbSend = new JButton("Send");

     // IO streams
     private DataOutputStream toServer;
     private DataInputStream fromServer;

     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 GridLayout(2, 2));
         p.add(new JLabel(" Enter Name: "));
         p.add(jtfName);
         p.add(new JLabel(" Enter Message: "));
         p.add(jtfMessage);
         jtfName.setHorizontalAlignment(JTextField.LEFT);
         jtfMessage.setHorizontalAlignment(JTextField.LEFT);

         setLayout(new BorderLayout());
         add(p, BorderLayout.NORTH);
         add(new JScrollPane(jta), BorderLayout.CENTER);
         add(jbSend, BorderLayout.SOUTH);

         // Register listener for jbSend button
         jbSend.addActionListener(new ButtonListener());

         // Register listener for jtfName JTextField
         jtfName.addActionListener(new ButtonListener());

         // Register listener for jtfMessage JTextField
         jtfMessage.addActionListener(new ButtonListener());

         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", 2014);

             // 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());

             // Receive data from the server all the time
             while (true) {
                 // read data from client
                 String sentence = fromServer.readUTF();
                 SimpleDateFormat format = new SimpleDateFormat(
                         "yyyy-MM-dd HH:mm:ss");
                 Date d = new Date();
                 String time = format.format(d);

                 // Display to the text area
                 jta.append(" " + time + "\n");
                 jta.append(" " + sentence + "\n");
             }
         } catch (IOException ex) {
             jta.append(" ***服务器连接失败!***" + '\n');
         }
     }

     private class ButtonListener implements ActionListener {
         public void actionPerformed(ActionEvent e) {
             try {
                 // Get the Name and Message from the text field
                 String Name = jtfName.getText().trim();
                 String Message = jtfMessage.getText().trim();
                 // Prevent send a blank message
                 if (Name != null && Name.length() != 0 && Message != null
                         && Message.length() != 0) {
                     String data = Name + "： " + Message;

                     // Send the data to the server
                     toServer.writeUTF(data);
                     toServer.flush();
                 } else
                     jta.append(" ***警告：名称和内容均不能为空!*** " + "\n");

             } catch (IOException ex) {
                 System.err.println(ex);
             }
         }
     }
 }

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