Question

5、聊天小程序

用java语言编一个聊天小程序
要求：
使用图形用户界面。
能实现一个聊天室中多人聊天。
可以两人私聊。
提示：使用socket通信

Answer 1

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

public class test
{
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
DrawFrame frame = new DrawFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}

}
class DrawFrame extends JFrame
{
public DrawFrame()
{

setLocation(100,100);
setTitle("我的QQ");
setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);
//添加菜单项……
JMenuBar menuBar = new JMenuBar();
setJMenuBar(menuBar);
JMenu edit = new JMenu("菜单");
menuBar.add(edit);
JMenuItem sset = new JMenuItem("设置");
JMenuItem eexit = new JMenuItem("退出");
edit.add(sset);
edit.addSeparator();
edit.add(eexit);
final DrawPanel pan = new DrawPanel();
//添加设置对话框
sset.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event)
{
final JFrame jf = new JFrame("设置");
jf.setSize(300,150);
jf.setLocation(200,200);
jf.setResizable(false);
jf.setVisible(true);
JPanel jp = new JPanel();
final JTextField jt1 = new JTextField(20);
final JTextField jt2 = new JTextField(20);
final JTextField jt3 = new JTextField(20);
jp.add(new JLabel("聊天端口:"));
jf.add(jp);
jp.add(jt1);
jp.add(new JLabel("目标地址:"));
jp.add(jt2);
jp.add(new JLabel("文件端口:"));
jp.add(jt3);
JButton jb1 = new JButton("确定");
JButton jb2 = new JButton("取消");
jp.add(jb1);
jp.add(jb2);
//设置“设置”按钮
jb1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event){
try{
int cat1 = Integer.parseInt(jt1.getText());
pan.setCat1(cat1);//设置对话端口号
int cat2 = Integer.parseInt(jt3.getText());
pan.setCat2(cat2);//设置文件传输端口号
String s = jt2.getText();
pan.setIP(s);//设置IP地址
pan.ls();
}
catch(Exception e)
{
e.printStackTrace();
}
jf.dispose();//关闭对话框
}
});
jb2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event){
jf.dispose();
}
});
}
});
eexit.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event){
System.exit(0);
}
});

add(pan);
pack();
}
public static final int DEFAULT_WIDTH = 400;
public static final int DEFAULT_HEIGHT = 400;
}
class DrawPanel extends JPanel
{
DatagramSocket ds;
DatagramPacket dp;
DatagramSocket ds1;
DatagramPacket dp1;
Thread thread;
Thread thread1;
TextArea textArea1 = new TextArea(10,50);
TextArea textArea2 = new TextArea(10,50);
JTextField textField = new JTextField(50);
static int cat1,cat2;
static String IP;
public void setCat1(int cat)
{
cat1 = cat;
}
public void setCat2(int cat)
{
cat2 = cat;
}
public void setIP(String ip)
{
IP=ip;
}
//重置端口号
public void ls()
{
try
{
ds = new DatagramSocket(cat1);
ds1 = new DatagramSocket(cat2);
}
catch(Exception e)
{
e.printStackTrace();
}
thread = new Thread(new Runnable()
{
public void run()
{
byte buf[] = new byte[1024];//聊天每次发送文字不能超过1024b
DatagramPacket dp = new DatagramPacket(buf,buf.length);

while(true)
{
try
{
ds.receive(dp);
textArea1.setText(textArea1.getText()+ new String(buf,0,dp.getLength()) + "\r\n");
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
});
thread.start();
}
public DrawPanel()
{

setLayout(new BorderLayout());
JTabbedPane card = new JTabbedPane();

textArea1.setEditable(false);
card.add("聊天",textArea1);
add(card,BorderLayout.NORTH);

JPanel center = new JPanel();
center.setLayout(new FlowLayout());
center.add(new JLabel("昵称："));

center.add(textField);
add(center,BorderLayout.CENTER);

JPanel south = new JPanel();
south.setLayout(new BorderLayout());

south.add(textArea2,BorderLayout.NORTH);

JPanel south2 = new JPanel();
south2.setLayout(new FlowLayout());
JButton sent = new JButton("传送文件");
JButton receive = new JButton("接收文件");
//receive.setEnabled(false);
JButton sentMessage = new JButton("发送");
south2.add(sent);
south2.add(receive);

south2.add(sentMessage);
add(south,BorderLayout.SOUTH);
south.add(south2,BorderLayout.SOUTH);
//发送信息的按钮的监听器:
sentMessage.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
textArea1.append(textField.getText()+":"+textArea2.getText()+"\n");
String s;
try
{
s = textField.getText() + ":" + textArea2.getText();
byte[] buf = s.getBytes();
dp = new DatagramPacket(buf,buf.length,InetAddress.getByName(IP),cat1);
ds.send(dp);
textArea2.setText("");
}
catch (Exception ex)
{
ex.printStackTrace();
}
}
});
//发送文件的按钮的监听器
sent.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
JFrame f = new JFrame("打开");
f.setSize(400,300);
JFileChooser chooser = new JFileChooser();
f.add(chooser);
int returnVal = chooser.showOpenDialog(f);
if(returnVal == JFileChooser.APPROVE_OPTION)
{
textArea1.append("正在传送文件:"+chooser.getCurrentDirectory()+"\\"
+chooser.getSelectedFile().getName()+"\n");
try
{
byte[] b = new byte[10248];
FileInputStream fis = new FileInputStream(chooser.getSelectedFile());
DataInputStream dos =new DataInputStream(fis);
dos.read(b);
dp1 = new DatagramPacket(b,b.length,InetAddress.getByName(IP),cat2);
ds1.send(dp1);
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
});
//接收文件的按钮的监听器:
receive.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
JFrame f1 = new JFrame("保存");
f1.setSize(400,300);
byte buf[] = new byte[10248];
DatagramPacket dp1 = new DatagramPacket(buf,buf.length);
JFileChooser ch = new JFileChooser();
f1.add(ch);
int a = ch.showSaveDialog(f1);
if(a ==JFileChooser.APPROVE_OPTION)
{
String fileName = ch.getSelectedFile().getPath();
try
{
ds1.receive(dp1);
FileOutputStream fos = new FileOutputStream(fileName);
fos.write(buf);
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
});
}
}