救救我，这女的太惨了，写一半感觉都是错的。。。。

Question

功能要求：用图形化界面实现QQ的部分功能，建立一个网络聊天程序，可以实现多人聊天，并可以保存聊天记录。

（1）多线程聊天程序；

（2）可以接收多人聊天；

（3）可以发送文件；

（4）可以发送图片；

（5）可以保存聊天记录。

Answer 1

package java3.T16;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
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 javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
/*
 * 用UDP技术实现简单聊天软件
 * */
import javax.swing.JTextField;
import javax.swing.JTextPane;
public class UdpChat extends JFrame implements ActionListener,Runnable{
	
	/*
	 * 关键参数
	 * 	1.自己的IP及端口，
	 * 	2.对方的IP及端口
	 * 	3.启动线程的按钮
	 * 	4.发送信息的按钮
	 * 	5.聊天内容的文本区域框
	 * 
	 * */
	JTextField txtSelfAddr,txtSelfPort,txtOtherAddr,txtOtherPort;
	JButton btnStart,btnSend,btnClose;
	//发送信息及接收信息的文本区域框
	JTextPane txtChatMsg,txtReceMsg;
	
	//数据报Socket;
	DatagramSocket socket;
	
	public UdpChat() {
		super("用UDP技术实现简单聊天软件");
		
		//自己的IP
		JLabel lblSelfAddr = new JLabel("自己IP：");
		txtSelfAddr = new JTextField("127.0.0.1",8);
		
		//自己的端口
		JLabel lblSelfPort = new JLabel("自己端口：");
		txtSelfPort = new JTextField("8888",5);
		//对方IP
		JLabel lblOtherAddr = new JLabel("自己端口：");
		txtOtherAddr = new JTextField("127.0.0.1",8);
		//对方端口
		JLabel lblOtherPort = new JLabel("对方端口：");
		txtOtherPort = new JTextField("8889",5);
		//启动线程的按钮
		btnStart = new JButton("启动接收线程");
		//发送信息
		btnSend = new JButton("发送");
		//关闭程序
		btnClose = new JButton("关闭");
		
		//注册按钮事件
		btnStart.addActionListener(this);
		btnSend.addActionListener(this);
		btnClose.addActionListener(this);
		
		
		JPanel northPane = new JPanel(new FlowLayout());
		northPane.add(lblSelfAddr);
		northPane.add(txtSelfAddr);
		northPane.add(lblSelfPort);
		northPane.add(txtSelfPort);
		northPane.add(lblOtherAddr);
		northPane.add(txtOtherAddr);
		northPane.add(lblOtherPort);
		northPane.add(txtOtherPort);
		northPane.add(btnStart);
		add(northPane,BorderLayout.NORTH);
		
		//聊天内容文本框放在中间
		txtChatMsg = new JTextPane();
		txtReceMsg = new JTextPane();
		JPanel centerPane = new JPanel(new GridLayout(2,1,5,10));
		centerPane.add(txtReceMsg);
		centerPane.add(txtChatMsg);
		add(centerPane);
		//发送按钮，关闭按钮放在底部右边
		JPanel southPane = new JPanel(new FlowLayout(FlowLayout.RIGHT));
		southPane.add(btnSend);
		southPane.add(btnClose);
		add(southPane,BorderLayout.SOUTH);
		setSize(800,500);
		setVisible(true);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setLocationRelativeTo(null);
		
	}
	//启动接收线程
	
	
	public static void main(String[] args) {
		UdpChat chat = new UdpChat();
	}
	@Override
	public void actionPerformed(ActionEvent e) {
		if(e.getSource() == btnClose) {
			System.exit(1);
		}else if(e.getSource() == btnStart) {
			//启动线程
			Thread thread = new Thread(this);
			thread.start();
			//把按钮状态设置为不可用状态
			btnStart.setEnabled(false);
		}else if(e.getSource() == btnSend) {
			//获取对方的IP及端口
			String host = txtOtherAddr.getText();
			int port = Integer.parseInt(txtOtherPort.getText());
			
			InetAddress netAddr;
			try {
				netAddr = InetAddress.getByName(host);
				//创建发送信息的Socket
				DatagramSocket socket = new DatagramSocket();
				//获取发送文本框的内容
				String msg = txtChatMsg.getText();
				//创建数据报
				byte b[] = msg.getBytes();
				DatagramPacket p = new DatagramPacket(b, b.length,netAddr,port);
				//发送
				socket.send(p);
				System.out.println("发送成功...");
				//获取接收文本框的内容,同时加入发送的内容
				msg = txtReceMsg.getText() + "\n发给对方的信息：" + msg; 
				txtReceMsg.setText(msg);
				//清空发送框的内容
				txtChatMsg.setText("");
				//关闭
				socket.close();
				
			} catch (UnknownHostException e1) {
				e1.printStackTrace();
			} catch (SocketException e1) {
				e1.printStackTrace();
			} catch (IOException e1) {
				e1.printStackTrace();
			}
			
		}
		
	}


	@Override
	public void run() {
		//监听是否有信息需要接收
		//获取自己端口
		int port = Integer.parseInt(txtSelfPort.getText());
		byte b[] = new byte[2048];
		int len=0;
		try {
			//创建UDP套接字(DatagramSocket)
			socket = new DatagramSocket(port);
			//接收信息的DatagramPacket对象
			DatagramPacket p = new DatagramPacket(b, b.length);
			while(true) {
				//接收信息
				socket.receive(p);
				//把接收的数据转换为字符串
				len = p.getLength();
				String msg = new String(b,0,len);
				msg = txtReceMsg.getText() + "\n接收对方的信息：" + msg; 
				txtReceMsg.setText(msg);
				
			}
			
		} catch (SocketException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}		
	}

}