主要思路很简单：
1.设置自己的接收端口
2.设置对方IP和端口
3.发送数据和接收数据
下面是主要代码：
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
public class QQFrame extends JFrame implements Runnable
{
private JTextArea sendArea = new JTextArea(20,20);
private JTextArea showArea = new JTextArea(10,20);
private JButton sendButton = new JButton("发送");
private MenuBar menuBar = new MenuBar();
private Menu setMenu = new Menu("设置");
private Menu helpMenu = new Menu("帮助");
private MenuItem aboutItem = new MenuItem("关于");
private MenuItem setItem = new MenuItem("配置参数");
private Thread thread = new Thread(this);
private Config config = new Config();
private JDialog dialog = new JDialog(this,"参数配置",true);
private int myPort;
QQFrame(int in_myPort)
{
super("局域网聊天工具");
setResizable(false);
myPort = in_myPort;
setItem.addActionListener(new SetDialog(dialog,this));
aboutItem.addActionListener(new AboutDialog(this));
initLayout();
sendButton.addActionListener(new SendListener(this,sendArea,showArea,config));
thread.start();
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
}
void initLayout()
{
int w,h;
w = 400;
h = 500;
setBounds(100,100,w,h);
setVisible(true);
setLayout(new GridLayout(3,1,10,15));
JPanel jp1,jp2;
jp1 = new JPanel();
jp2 = new JPanel();
JLabel jl1;
jl1 = new JLabel("聊天记录框：");
jp1.setLayout(null);
jp1.add(jl1);
jl1.setBounds(0,0,w,20);
jp1.add(showArea);
showArea.setBounds(0,30,w,h/3-20);
JLabel jl2;
jp2.setLayout(null);
jl2 = new JLabel("发送框：");
jp2.add(jl2);
jl2.setBounds(0,0,w,20);
sendArea.setBounds(0,30,w,h/3-20);
jp2.add(sendArea);
JPanel jp3 = new JPanel();
add(jp1);
add(jp2);
add(jp3);
jp3.add(sendButton);
setMenuBar(menuBar);
menuBar.add(setMenu);
menuBar.add(helpMenu);
helpMenu.add(aboutItem);
setMenu.add(setItem);
dialog.setBounds(120,150,200,250);
JLabel IPLabel = new JLabel("对方IP");
JLabel yourPortLabel = new JLabel("对方接收端口");
JLabel nameLabel = new JLabel("本机名");
JTextField IPTextField = new JTextField(15);
JTextField yourPortTextField = new JTextField(8);
JTextField nameTextField = new JTextField(15);
IPTextField.setText("127.0.0.1");
yourPortTextField.setText("879");
nameTextField.setText("hanxi");
dialog.setLayout(new GridLayout(4,2,10,10));
dialog.add(IPLabel);
dialog.add(IPTextField);
dialog.add(yourPortLabel);
dialog.add(yourPortTextField);
dialog.add(nameLabel);
dialog.add(nameTextField);
dialog.add(new Panel());
JButton sureButton = new JButton("确定");
dialog.add(sureButton);
sureButton.addActionListener(new SureListener(IPTextField,yourPortTextField,nameTextField,dialog,config));
}
public void run()
{
DatagramPacket dp = null;
DatagramSocket ds = null;
byte[] buf = new byte[1024];
try
{
dp = new DatagramPacket(buf,buf.length);
ds = new DatagramSocket(myPort);
System.out.println("myport="+myPort);
}
catch (Exception e)
{}
while (true)
{
try
{
ds.receive(dp);
int length = dp.getLength();
InetAddress address = dp.getAddress();
int port = dp.getPort();
String message = new String(dp.getData(),0,length);
showArea.append("收到数据长度："+length+"\n");
showArea.append("收到数据来自："+address+"端口："+port+"\n");
showArea.append("收到数据是："+message+"\n");
}
catch (Exception e)
{
}
}
}
}
//发送事件
class SendListener implements ActionListener
{
private JFrame QQFrame;
private JTextArea sendArea;
private JTextArea showArea;
private Config config;
SendListener(JFrame in_QQFrame, JTextArea in_sendArea, JTextArea in_showArea, Config in_config)
{
QQFrame = in_QQFrame;
sendArea = in_sendArea;
showArea =in_showArea;
config = in_config;
System.out.println("in_port:"+config.getyourPort());
QQFrame.validate();
}
public void actionPerformed(ActionEvent e)
{
System.out.println("你点击了发送按钮");
byte[] buf = sendArea.getText().trim().getBytes();
try
{
InetAddress address = InetAddress.getByName(config.getIP());
DatagramPacket dp = new DatagramPacket(buf,buf.length,address,Integer.parseInt(config.getyourPort()));
DatagramSocket ds = new DatagramSocket();
showArea.append("数据包目标地址："+dp.getAddress()+"\n");
showArea.append("数据包目标端口号："+dp.getPort()+"\n");
showArea.append("数据包长度："+dp.getLength()+"\n");
ds.send(dp);
}
catch (Exception ee) {}
}
}
//配置设置
class SetDialog implements ActionListener
{
private JDialog dialog;
private JFrame frame;
SetDialog(JDialog in_dialog,JFrame parent)
{
dialog = in_dialog;
frame = parent;
}
public void actionPerformed(ActionEvent e)
{
dialog.validate();
int x = frame.getX();
int y = frame.getY();
dialog.setBounds(x+50,y+50,200,250);
dialog.setVisible(true);
}
}
//关于对话框
class AboutDialog extends JDialog implements ActionListener
{
private JFrame frame;
private JLabel jl = new JLabel("感谢您的使用，作者：涵曦");
AboutDialog(JFrame parent)
{
frame = parent;
add(jl);
}
public void actionPerformed(ActionEvent e)
{
validate();
int x = frame.getX();
int y = frame.getY();
setBounds(x+50,y+50,200,250);
setVisible(true);
}
}
//对话框的确定按钮事件
class SureListener implements ActionListener
{
JTextField IPTextField;
JTextField yourPortTextField;
JTextField nameTextField;
private Dialog dialog;
private Config config;
SureListener(JTextField in_IPTextField,JTextField in_yourPortTextField,JTextField in_nameTextField,JDialog in_dialog,Config in_config)
{
IPTextField = in_IPTextField;
yourPortTextField = in_yourPortTextField;
nameTextField = in_nameTextField;
dialog = in_dialog;
config = in_config;
}
public void actionPerformed(ActionEvent e)
{
config.set(IPTextField.getText(),yourPortTextField.getText(),nameTextField.getText());
System.out.println("config:yourPort:"+config.getyourPort());
dialog.setVisible(false);
}
}
//参数
class Config
{
private String IP="127.0.0.1";
private String yourPort="666";
private String name="hanxi";
public void set(String in_IP, String in_yourPort,String in_name)
{
IP = in_IP;
yourPort = in_yourPort;
name = in_name;
}
public String getIP()
{
return IP;
}
public String getyourPort()
{
return yourPort;
}
public String getName()
{
return name;
}
}
下面是主方法代码：
public class QQ
{
public static void main(String args[])
{
if (args.length == 0)
{
System.out.println("请在QQ后面输入接收数据的端口号（需要空格）！");
System.exit(0);
}
System.out.println(Integer.parseInt(args[0]));
QQFrame frame = new QQFrame(Integer.parseInt(args[0]));
}
}
设置端口和IP的图片
下面是聊天界面
