GUI 聊天界面

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Event;
import java.awt.Font;
import java.awt.Frame;
import java.awt.HeadlessException;
import java.awt.Panel;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.management.ImmutableDescriptor;

public class demon4_guiChat extends Frame{
    private TextField tf;
    private Button send;
    private Button log;
    private Button clear;
    private Button shake;
    private TextArea viewText;
    private TextArea sendText;
    private DatagramSocket socket;
    private BufferedWriter bw;
    private BufferedReader br;

    /*
     * GUI    聊天
     *   继承frame  可以使用frame 的所有方法
     */
    
    

//    vvvpackage com.heima.socket;
public static void main(String[] args) throws Exception {        //主方法  主线程
        new demon4_guiChat();        
    }

    public demon4_guiChat() throws Exception {
        init();     //初始化 窗体  和开启接收信息的多线程
        southPanel();        //  创建南边的panel
        centerPanel();       //  创建中间的panel
        event();             //   事件处理：            
    }

    public void event() {
        this.addWindowListener(new WindowAdapter() {

            @Override
            public void windowClosing(WindowEvent e) {
                try {
                    socket.close();
                    bw.close();
                } catch (IOException e1) {
                    
                    e1.printStackTrace();
                }
                System.exit(0);
            }
            
        });
        send.addActionListener(new ActionListener() {            
            @Override
            public void actionPerformed(ActionEvent e) {
                try {
                    send();
                } catch (IOException e1) {
                    
                    e1.printStackTrace();
                }
            }            
        });
        log.addActionListener(new ActionListener() {
            
            @Override
            public void actionPerformed(ActionEvent e) {                
                try {
                    logFile();
                } catch (IOException e1) {
                    
                    e1.printStackTrace();
                }
            }

        });
        clear.addActionListener(new ActionListener() {
            
            @Override
            public void actionPerformed(ActionEvent e) {
                viewText.setText("");
            }
        });
        shake.addActionListener(new ActionListener() {
            
            @Override
            public void actionPerformed(ActionEvent e) {
                try {
                    send(new byte[]{-1}, tf.getText());
                } catch (IOException e1) {
                    
                    e1.printStackTrace();
                }
            }            
        });
        sendText.addKeyListener(new KeyAdapter() {

            @Override
            public void keyReleased(KeyEvent e) {
                if (e.getKeyCode() == KeyEvent.VK_ENTER && e.isControlDown()) {
                    try {
                        send();
                    } catch (IOException e1) {
                        
                        e1.printStackTrace();
                    }
                }                
            }
            
        });
    }
    private void shake() {
        int x = this.getLocation().x;
        int y = this.getLocation().y;
        for (int i = 0; i < 5 ; i++) {
            try {
                this.setLocation(x+10, y+10); 
                Thread.sleep(20);
                this.setLocation(x+10, y-10);
                Thread.sleep(20);
                this.setLocation(x-10, y+10);
                Thread.sleep(20);
                this.setLocation(x-10, y-10);
                Thread.sleep(20);
                this.setLocation(x, y);
            } catch (InterruptedException e) {
                
                e.printStackTrace();
            }
        }
        
    }

    private void logFile() throws IOException {
        bw.flush();
        FileInputStream f1 = new FileInputStream("conifg.txt");
        ByteArrayOutputStream b1 = new ByteArrayOutputStream();   //  在内存中创建缓冲区
        int len ;
        byte[] arr = new byte[8192];
        while ((len = f1.read(arr)) != -1) {
            b1.write(arr, 0, len);
        }
        String str = b1.toString();
        viewText.setText(str);
        f1.close();
    }
    
    private void send() throws IOException {
        String message = sendText.getText();     // 获取发送区域的内容        
        String ip = tf.getText();          //获取IP地址
        ip = ip.trim().length() == 0 ? "255.255.255.255":ip;         // 去掉前后空格
        send(message.getBytes(), ip);
        //viewText.setText(message);   //将信息显示在显示区
        String time = getCurrentTime();
        
        String sendStr = time + "   我对" + (ip.equals("255.255.255.255")?"所有人":ip) + "说:" + "\r\n" + message + "\r\n\r\n";
        viewText.append(sendStr);     // 将信息添加到显示区 
        bw.write(sendStr);
        sendText.setText("");        
    }

    public void send(byte[] arr, String ip) throws IOException {
        DatagramPacket packet = 
                new DatagramPacket(arr, arr.length, InetAddress.getByName(ip), 8888);
        socket.send(packet);
    }
    
    private String getCurrentTime() {
        Date d = new Date();  //创建当前日期对象
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss");  //大MM 小dd
        return sdf.format(d);     //将时间格式化
    } 

    public void centerPanel() {
        Panel center = new Panel();    // 创建中间的panel
        viewText = new TextArea();
        sendText = new TextArea(4,1);
        center.setLayout(new BorderLayout());   //设置为边界布局管理器
        center.add(sendText,BorderLayout.SOUTH);
        center.add(viewText,BorderLayout.CENTER);
        viewText.setEditable(false);
        sendText.setEditable(true);
        sendText.setFont(new Font("xxx", Font.PLAIN, 14));
        viewText.setFont(new Font("xxx", Font.PLAIN, 14));
        viewText.setBackground(Color.gray);
        this.add(center,BorderLayout.CENTER);
    }

    public void southPanel() {
        Panel south = new Panel();
        tf = new TextField(15);
        tf.setText("127.0.0.1");
        send = new Button("发送");
        log = new Button("记录");        
        clear = new Button("清屏");     
        shake = new Button("震动"); 
        south.add(tf);                     // 将各组件添加到组件中
        south.add(send);
        south.add(log);
        south.add(clear);
        south.add(shake);
        this.add(south,BorderLayout.SOUTH);    //将panel 增加到frame中的南边
    }

    public void init(){       //  初始化方法
        this.setLocation(500, 50);
        this.setSize(400, 600);
        new receive().start();   
        try {
            socket = new DatagramSocket();
            bw = new BufferedWriter(new FileWriter("conifg.txt",true));
            bw.flush();
        } catch (Exception e) {
            
            e.printStackTrace();
        }
        this.setVisible(true);
        
        
    }
    
    class receive extends Thread{      // 接收发送需要同时执行   开启多线程
        //  再类中创建类  可以方便使用外部类的方法和变量   可以使用viewText
        public void run() {
            try {
                DatagramSocket socket = new DatagramSocket(8888);
                DatagramPacket packet = new DatagramPacket(new byte[8192], 8192);
                while (true) {                    
                    socket.receive(packet); 
                    byte[] arr = packet.getData();
                    int len = packet.getLength();   //  获取有效的字节数据
                    //System.out.println(len);
                    //System.out.println(arr.length);
                    if (arr[0] == -1 && len == 1) {
                        shake();
                        continue;        // 终止本次循环，开始下次循环
                    }
                    String time = getCurrentTime();
                    String message = new String(arr, 0, len);   //转换成字符串
                    String ip = packet.getAddress().getHostAddress();
                    String receiveStr = time + "   " + ip + "对我说：\r\n" + message + "\r\n\r\n";
                    viewText.append(receiveStr);
                    bw.write(receiveStr);
                    
                    
                }
                
            }  catch (Exception e) {
                
                e.printStackTrace();
            }
        }
    }
}