計算機網絡編程實驗

1、計算機網絡編程技術實 訓 報 告基于UDP協(xié)議多客戶有圖形用戶界面的網上聊天程序 UDP-based protocol multi-client with a graphical user interface, online chat program班 級：姓 名：學 號：伊犁師范學院電子與信息工程學院1 實驗目的鞏固所學的Java語言基礎知識，增進Java語言的編輯基本功，拓展常用類庫的應用，了解Java網絡程序設計的思路和方法，熟練掌握UDP協(xié)議編寫程序的設計方法，掌握基本網絡包的使用方法，熟練使用Socket以及多線程。2 實驗內容運用Java程序編寫聊天室，實現(xiàn)一個基于

2、UDP協(xié)議的簡單的聊天程序，支持多人聊天并且客戶端具有圖形化用戶界面。程序實現(xiàn)了聊天室的基本功能，其中有：1.啟動服務器。2.啟動登錄界面。3.進入客戶端界面。4.發(fā)送信息。5.離開客戶端界面。6.關閉服務器。三、實驗環(huán)境操作系統(tǒng)：Windows平臺。測試環(huán)境：Eclipse。四、實驗步驟 1創(chuàng)建項目，組織文件 啟動Eclipse ，建立項目、包及各類，鍵入代碼，操作結果如圖1所示。圖1項目和文件2. 運行程序進行測試（1）首先運行Server.java，打開“聊天室服務器”。服務器IP地址為如圖2所示。圖2服務器控制臺（2） 服務器監(jiān)聽是否有新聊天者連接，如果沒有，一直

3、等待。如圖3所示。圖3 服務器等待(3)運行客戶端程序client.java，打開“多人聊天室“界面，客戶端1的IP地址為客戶端2的IP地址為9，如圖4所示。圖4聊天室客戶端界面（4） 在“多人聊天室”界面輸入框輸入聊天信息。如圖5所示。圖5在輸入框輸入聊天信息（5）在“多人聊天室”界面發(fā)送信息。如圖6所示。圖6發(fā)送聊天信息（6） 服務器端顯示兩個客戶端聊天內容，如圖7所示。圖7服務器端顯示聊天內容（7） 退出服務器和多人聊天室。五、程序清單/多人聊天室服務器端package ChatFrame_01;import .Datagram

4、Packet;import .DatagramSocket;import .InetAddress;import .Socket;import java.util.*;public class Server List ips = new ArrayList();DatagramSocket socket;DatagramPacket packet;DatagramSocket ssocket;DatagramPacket spacket;public Server() throws Exception socket = new DatagramS

5、ocket(6666);ssocket=new DatagramSocket(8888);public void listen() throws Exception byte array = new byte100;packet = new DatagramPacket(array, array.length);socket.receive(packet);byte data=packet.getData();String received = new String(data,0,data.length,UTF-8);System.out.println(received);String ss

6、 = received.split(|);String ip = ss0;byte dt=ss1.getBytes(UTF-8);spacket=new DatagramPacket(dt,dt.length,InetAddress.getByName(ip),3333);ssocket.send(spacket);public static void main(String args) throws Exception Server s = new Server();while (true) s.listen();/多人聊天室客戶端package ChatFrame_01;import ja

7、va.io.*;import javax.swing.UIManager;import java.awt.*;public class ChatApp boolean packFrame = false;ChatApp() ChatFrame frame = new ChatFrame();if (packFrame) frame.pack(); else frame.validate();/ 放置窗體在屏幕中央Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();Dimension frameSize = fra

8、me.getSize();if (frameSize.height screenSize.height) frameSize.height = screenSize.height;if (frameSize.width screenSize.width) frameSize.width = screenSize.width;frame.setLocation(screenSize.width - frameSize.width) / 2,(screenSize.height - frameSize.height) / 2);frame.setVisible(true);frame.waitfo

9、rpackets();public static void main(String args) new ChatApp();/登錄窗口package ChatFrame_01;import .*;import java.io.*;import java.awt.*;import java.awt.event.*;import javax.swing.*;import java.lang.*;import java.awt.color.*;import javax.swing.JOptionPane;public class ChatFrame extends JFrame JP

10、anel contentPane;JLabel label1 = new JLabel();/ 發(fā)送消息JLabel label2 = new JLabel();/ 輸入ipLabel label3 = new Label();/ 輸入端口標簽Label label4 = new Label();/ 輸出端口標簽JTextField textField1 = new JTextField();/ 發(fā)送消息JTextField textField2 = new JTextField();/ 輸入ipJTextField textField3 = new JTextField();/ 獲得輸入端口

11、JTextField textField4 = new JTextField();/ 獲得輸出端口JButton button1 = new JButton(發(fā)送);/ 發(fā)送消息TextArea textArea1 = new TextArea();JOptionPane jopane = new JOptionPane();DatagramPacket sendpacket, receivepacket;/ 聲明發(fā)送和接收數(shù)據(jù)包DatagramSocket sendsocket, receivesocket;/ 聲明發(fā)送和接收DatagramSocketpublic ChatFrame()

12、enableEvents(AWTEvent.WINDOW_EVENT_MASK);try toInit(); catch (Exception e) e.printStackTrace();private void toInit() throws Exception contentPane = (JPanel) this.getContentPane();label1.setText(發(fā)送信息：);label1.setBounds(new Rectangle(13, 100, 60, 21);contentPane.setLayout(null);contentPane.setBackgrou

13、nd(Color.pink);this.setSize(new Dimension(363, 502);this.setTitle(多人聊天室);label2.setText(輸入對方IP地址：);label2.setBounds(new Rectangle(12, 19, 109, 23);label3.setText(輸入端口：);label3.setBounds(new Rectangle(12, 58, 55, 22);label4.setText(輸出端口：);label4.setBounds(new Rectangle(180, 58, 55, 22);textField3.set

14、Text(3000);textField4.setText(3001);button1.setBounds(new Rectangle(280, 100, 59, 21);button1.addActionListener(new java.awt.event.ActionListener() public void actionPerformed(ActionEvent e) button1_actionPerformed(e););textField1.addKeyListener(new KeyAdapter() public void keyPressed(KeyEvent e) if

15、 (e.getKeyCode() = KeyEvent.VK_ENTER) String str = textField2.getText();String str1=textField1.getText();if (pareTo() != 0&!.equals(str1) try textArea1.append(nto + textField2.getText()+ : + 3000 + say: + textField1.getText();String s = textField1.getText();byte data = s.getBytes(UTF-8);sendp

16、acket = new DatagramPacket(data,data.length,InetAddress.getByName(9),6666);sendsocket.send(sendpacket); catch (IOException exc) exc.printStackTrace();textField1.setText(););textField4.setBounds(new Rectangle(240, 58, 90, 22);textField3.setBounds(new Rectangle(70, 58, 90, 22);textField2.se

17、tBounds(new Rectangle(123, 20, 120, 19);textField1.setBounds(new Rectangle(76, 100, 190, 19);textArea1.setBounds(new Rectangle(11, 140, 333, 315);textArea1.setEditable(false);textArea1.setBackground(Color.white);contentPane.add(label4, null);contentPane.add(label3, null);contentPane.add(label2, null

18、);contentPane.add(label1, null);contentPane.add(textField1, null);contentPane.add(textField2, null);contentPane.add(textField3, null);contentPane.add(textField4, null);contentPane.add(textArea1, null);contentPane.add(button1, null);this.setVisible(true);bind();protected void processWindowEvent(Windo

19、wEvent e) cessWindowEvent(e);if (e.getID() = WindowEvent.WINDOW_CLOSING) System.exit(0);public void waitforpackets() / 檢測并接受對方發(fā)來的消息while (true) try byte array = new byte100;receivepacket = new DatagramPacket(array, array.length);receivesocket.receive(receivepacket);/ 接收textArea1.append(nfro

20、m + receivepacket.getAddress() + :+ receivepacket.getPort() + get:);String received = new String(receivepacket.getData(), 0,receivepacket.getLength(), UTF-8);textArea1.append(received); catch (IOException se) se.printStackTrace();void bind() / 和對方建立連try sendsocket = new DatagramSocket(3000);receivesocket = new DatagramSocket(3333); catch (Exception e) void button1_actionPerformed(ActionEvent e) / 發(fā)送消息到對方String str = textField2.getText();String str1=textField1.getText();if (pareTo() != 0&!.equals(str1) try textArea1.append(n