HiChat简单聊天程序

有人说swing编写程序可再用性比较差，通过学习我觉得也是这样，因为界面部分代码实在是很乱。

程序界面：

               

程序代码：

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.net.*;
import java.io.IOException;
import java.io.*;


public class chat {
    public static void main(String[] args) {
        new UDPMessage();
    }
}

class UDPMessage extends JFrame implements ActionListener {

    /**
     *
     */
    private static final long serialVersionUID = 1L;
    private JTextArea recordText = new JTextArea();
    private JTextArea sendText = new JTextArea();
    private DatagramSocket ds;
    private JButton btnSend = new JButton("发送");
    private JButton btnExit = new JButton("关闭");
    private JLabel otherTips = new JLabel("对方IP");
    private JTextField otherIp = new JTextField();
    private JLabel myTips = new JLabel("我的IP");
    private JTextArea myIp = new JTextArea();
    InputStreamReader in;                   //创建一个文件输入流
    OutputStreamWriter out;                 //创建一个文件输出流
    Container p;
    JScrollPane jspRecord;
    JMenuBar mb = new JMenuBar();
    JMenu[] m = {new JMenu("文件"),
                             new JMenu("好友"),
                   new JMenu("背景")};
    JMenuItem[][] mi = {{new JMenuItem("传送文件")},
                                            {new JMenuItem("Regina"),new JMenuItem("Taotao"),new JMenuItem("LiShuo")},
                          {new JMenuItem("默    认"),new JMenuItem("浅灰色"),new JMenuItem("淡紫色"),new JMenuItem("黄绿色")}};

    public UDPMessage() {
        super("HiChat");
        p = getContentPane();
        setSize(550, 475);
        centerOnScreen();
        setResizable(false);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        for(int i=0; i<m.length; i++) {
            mb.add(m[i]);
            for(int j=0; j<mi[i].length; j++) {
                m[i].add(mi[i][j]);
                mi[i][j].addActionListener(this);
            }
        }
        setJMenuBar(mb);
        p.setBackground(new Color(218, 112, 214));
        p.setLayout(null);
        recordText.setEditable(false);
        recordText.setLineWrap(true);
        jspRecord = new JScrollPane(recordText);
        jspRecord.setBounds(2, 5, 350, 270);
        p.add(jspRecord);
        sendText.setLineWrap(true);
        JScrollPane jspSend = new JScrollPane(sendText);
        jspSend.setBounds(2, 285, 350,100);
        p.add(jspSend);
        btnExit.setBounds(184,390,80,25);
        btnExit.setMargin(new Insets(0, 0, 0, 0));
        btnExit.addActionListener(this);
        p.add(btnExit);
        btnSend.setBounds(271,390,80,25);
        btnSend.setMargin(new Insets(0, 0, 0, 0));
        btnSend.addActionListener(this);
        p.add(btnSend);
        GridLayout gl = new GridLayout(2, 0);
        gl.setVgap(15);
        JPanel infoPane = new JPanel(gl);
        infoPane.setOpaque(false);
        JPanel otherPane = new JPanel(null);
        otherTips.setBounds(10, 10, 80, 20);
        otherTips.setForeground(Color.red);
        otherIp.setBounds(35, 35, 105,20);
        JLabel otherPhoto = new JLabel(new ImageIcon("kabb.jpg"));
        otherPhoto.setBounds(30, 65, 120, 120);
        otherPane.add(otherPhoto);
        otherPane.add(otherTips);
        otherPane.add(otherIp);
        infoPane.add(otherPane);
        JPanel myPane = new JPanel(null);
        myTips.setBounds(10, 10, 80, 20);
        myTips.setForeground(Color.red);
        myIp.setBounds(35, 35, 105,20);
        try{
            myIp.setText(" "+InetAddress.getLocalHost().getHostAddress());
        } catch(UnknownHostException e) {
            e.printStackTrace();
        }
        myIp.setEditable(false);
        JLabel myPhoto = new JLabel(new ImageIcon("kabbn.jpg"));
        myPhoto.setBounds(30, 65, 120, 120);
        myPane.add(myPhoto);
        myPane.add(myTips);
        myPane.add(myIp);
        infoPane.add(myPane);
        infoPane.setBounds(357, 5, 185, 410);
        p.add(infoPane);
        server();
        setVisible(true);
    }

    private void server() {
        try {
            ds = new DatagramSocket(9527);
            byte[] buf = new byte[1024];
            final DatagramPacket dp = new DatagramPacket(buf, buf.length);
            Runnable run = new Runnable() {
                public void run() {
                    while(true) {
                        try {
                            Thread.sleep(100);
                            ds.receive(dp);
                            int length = dp.getLength();
                            String message = new String(dp.getData(), 0, length);
                            String ip = dp.getAddress().getHostAddress();
                            if(!InetAddress.getLocalHost().getHostAddress().equals(ip)) {
                                recordText.append(dp.getAddress().getHostName()+":/n      "+message+"/n");
                            }
                            recordText.setCaretPosition(recordText.getText().length());
                        } catch(IOException e) {
                            e.printStackTrace();
                        } catch(InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                }
            };
            new Thread(run).start();
        } catch(SocketException e) {
            e.printStackTrace();
        }
    }

    public void actionPerformed(ActionEvent e) {
        if(e.getActionCommand() == "默    认") {
            p.setBackground(new Color(240, 255, 255));
        }
        if(e.getActionCommand() == "浅灰色") {
            p.setBackground(new Color(192, 192, 192));
        }
        if(e.getActionCommand() == "淡紫色") {
            p.setBackground(new Color(218, 112, 214));
        }
        if(e.getActionCommand() == "黄绿色") {
            p.setBackground(new Color(127, 255, 0));
        }
        if(e.getActionCommand() == "传送文件") {   //功能尚未实现，一下代码无法使用
            /*try {
                ds = new DatagramSocket(9527);
                byte[] buf = new byte[1024];
                File f = new File("Test4.java");
                FileInputStream fis = new FileInputStream(f);
                //FileOutputStream fos = new FileOutputStream(f);
                while(fis.read(buf)>0) {
                    final DatagramPacket dp = new DatagramPacket(buf, buf.length);
                    ds.receive(dp);
                }
            } catch(IOException ee) {
                ee.printStackTrace();
            }*/
        }
        if(e.getActionCommand() == "Regina") {
            otherIp.setText("对方ip地址");
        }
        if(e.getActionCommand() == "Taotao") {
            otherIp.setText("对方ip地址");
        }
        if(e.getActionCommand() == "LiShuo") {
            otherIp.setText("对方ip地址");
        }
        if(e.getSource() == btnSend) {
            try {
                String ip = otherIp.getText();
                InetAddress addr = InetAddress.getByName(ip);
                byte[] data = sendText.getText().getBytes();
                DatagramPacket dp = new DatagramPacket(data, data.length, addr, 9527);
                String myName = InetAddress.getLocalHost().getHostName();
                recordText.append(myName+":/n      "+sendText.getText()+"/n");
                ds.send(dp);
                sendText.setText(null);
            } catch(UnknownHostException ee) {
                ee.printStackTrace();
            } catch(IOException ee) {
                ee.printStackTrace();
            }
        }
        if(e.getSource() == btnExit) {
            System.exit(0);
        }
    }

    public void centerOnScreen() {        //使窗体被创建后在屏幕中间显示
        Dimension displaySize = getToolkit().getScreenSize();
        Dimension winSize = getSize();
        int x = (displaySize.width - winSize.width) / 2;
        int y = (displaySize.height - winSize.height) / 2;
        if(x < 0) {
            x = 0;
        }
        if(y < 0) {
            y = 0;
        }
        setLocation(x, y);
    }
}

swing本来就很庞杂，所以自学习中明白那种最适合自己就选用那种，因为要实现相同效果的程序可以用很多种不同的swing组件来实现，所以我一般是想到那里就学习那个的用法，然后组在一起构成程序。