package chat1;
import java.io.*;
import java.net.*;
import java.util.*;

public class ChatServer {
    boolean started = false;
    ServerSocket ss = null;
    List<Client> clients = new ArrayList<Client>();

    public static void main(String[] args) {
        new ChatServer().start();
    }

    public void start() {
        try {
            ss = new ServerSocket(8888);
            started = true;
            System.out.println("端口已开启,占用8888端口号....");
        } catch (BindException e) {
            System.out.println("端口使用中....");
            System.out.println("请关掉相关程序并重新运行服务器！");
            System.exit(0);
        } catch (IOException e) {
            e.printStackTrace();
        }

        try {
            while (started) {
                Socket s = ss.accept();
                Client c = new Client(s);
                System.out.println("a client connected!");
                new Thread(c).start();
                clients.add(c);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                ss.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    class Client implements Runnable {
        private Socket s;
        private DataInputStream dis = null;
        private DataOutputStream dos = null;
        private boolean bConnected = false;

        public Client(Socket s) {
            this.s = s;
            try {
                dis = new DataInputStream(s.getInputStream());
                dos = new DataOutputStream(s.getOutputStream());
                bConnected = true;
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        public void send(String str) {
            try {
                dos.writeUTF(str);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        public void run() {
            try {
                while (bConnected) {
                    String str = dis.readUTF();
                    System.out.println("------------来自本地服务器:" + str);
                    for (int i = 0; i < clients.size(); i++) {
                        Client c = clients.get(i);
                        c.send(str);
                    }
                }
            } catch (EOFException e) {
                System.out.println("Client closed!");
                clients.remove(this);
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    if (dis != null)
                        dis.close();
                    if (dos != null)
                        dos.close();
                    if (s != null) {
                        s.close();
                    }

                } catch (IOException e1) {
                    e1.printStackTrace();
                }

            }
        }
    }
}

package chat1;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

/**
 * @author Michael Huang
 * 
 */
public class ChatClient extends Frame {
    Socket s = null;
    DataOutputStream dos = null;
    DataInputStream dis = null;
    private boolean bConnected = false;

    TextField tfTxt = new TextField();
    TextArea taContent = new TextArea();

    Thread tRecv = new Thread(new RecvThread());

    public static void main(String[] args) {
        new ChatClient().launchFrame(8888);
    }

    public void launchFrame(int port) {
        setLocation(400, 300);
        this.setSize(300, 300);
        add(tfTxt, BorderLayout.SOUTH);
        add(taContent, BorderLayout.NORTH);
        pack();
        this.addWindowListener(new WCloseListener());
        tfTxt.addActionListener(new TFListener());
        setVisible(true);
        connect(port);

        tRecv.start();
    }

    public void connect(int port) {
        try {
            s = new Socket("127.0.0.1", port);
            dos = new DataOutputStream(s.getOutputStream());
            dis = new DataInputStream(s.getInputStream());
            System.out.println("~~~~~~~~连接成功~~~~~~~~!");
            bConnected = true;
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    public void disconnect() {
        try {
            dos.close();
            dis.close();
            s.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
    private class WCloseListener extends WindowAdapter{

        @Override
        public void windowClosing(WindowEvent e) {
            disconnect();
            System.exit(0);
        }
        
    }

    private class TFListener implements ActionListener {

        public void actionPerformed(ActionEvent e) {
            String str = tfTxt.getText().trim();
            tfTxt.setText("");

            try {
                dos.writeUTF(str);
                dos.flush();
            } catch (IOException e1) {
                e1.printStackTrace();
            }

        }

    }

    private class RecvThread implements Runnable {

        public void run() {
            try {
                while (bConnected) {
                    String str = dis.readUTF();
                    taContent.setText(taContent.getText() + str + '\n');
                }
            } catch (SocketException e) {
                System.out.println("退出了，bye!");
            } catch (EOFException e) {
                System.out.println("退出了，bye!");
            } catch (IOException e) {
                e.printStackTrace();
            }

        }

    }
}