西北农林科技大学 Java 网络编程.doc

实验八 网络编程基础1实验目的（1）掌握Socket通信。（2）掌握UDP通信2实验内容实验题1 使用InetAddress类的方法获取/的主机的IP地址；获取本地机的名称和IP地址。具体代码如下：package demo;import .InetAddress ;public class InetAddressDemo public static void main(String args)throws Exception InetAddress locAdd = null ;locAdd = InetAddress.getLocalHost() ;/ 得到本机System.out.println(本机的IP地址： + locAdd.getHostAddress() ;System.out.println(本机的名称+locAdd.getHostName();运行结果如下：实验题2 使用URL类下载西北农林科技大学首页/，并统计下载得到网页文件的大小。具体代码如下：package demo;import .URL ;import .URLConnection ;import java.io.InputStream ;import java.util.Scanner ;public class URLConnectionDemo public static void main(String args) throws ExceptionURL url = new URL() ;URLConnection urlCon = url.openConnection() ;/ 建立连接InputStream input = url.openStream() ;Scanner scan = new Scanner(input) ;scan.useDelimiter(n) ;while(scan.hasNext()System.out.println(scan.next() ;System.out.println(内容大小： + urlCon.getContentLength() ;实验题3 利用Socket类和ServerSocket类编写一个C/S程序，实现C/S通信。客户端向服务器端发送Time命令，服务器端接受到该字符串后将服务器端当前时间返回给客户端；客户端向服务器端发送Exit命令，服务器端向客户端返回“Bye”后退出。基本要求 编写完整程序；两人一组，一个作为服务器端，另一人作为客户端。服务器端和客户端都需要打印出接受到的消息和发出的命令。具体的程序代码如下：package demo;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import .ServerSocket;import .Socket;import java.util.Calendar;public class server public static void main(String args) try ServerSocket server = new ServerSocket(9527);System.out.println(服务器启动完毕);Socket socket = server.accept();System.out.println(创建客户连接);InputStream input = socket.getInputStream();InputStreamReader isreader = new InputStreamReader(input);BufferedReader reader = new BufferedReader(isreader);while (true) String str = reader.readLine();if (str.equals(exit) System.out.println(Bye);break;if (str.equals(Time) String s = Calendar.getInstance().getTime().toString();System.out.println(服务器当前的时间为: + s);reader.close();isreader.close();input.close();socket.close();server.close(); catch (IOException e) e.printStackTrace();package demo;import java.io.IOException;import java.io.OutputStream;import .UnknownHostException;import .Socket;public class Client public static void main(String args) try Socket socket = new Socket(localhost, 9527);OutputStream out = socket.getOutputStream();out.write(Timen.getBytes();out.write(exitn.getBytes(); catch (UnknownHostException e) e.printStackTrace(); catch (IOException e) e.printStackTrace();运行结果如下：实验题4 编写一数据报通信程序，实现简单的聊天功能。聊天内容输入文本确定清空退出图3.14 聊天程序界面基本要求 两人一组编写完整程序。“聊天内容”和“输入文本”分别为当前聊天的历史信息和当前要传送出去的聊天文本。“确定”、“清空”、“退出”三个按钮分别实现发送当前聊天文本、清空当前聊天文本和退出系统的功能。具体代码如下：package ChattingP;import java.awt.*;import java.awt.event.*;import java.io.IOException;import .*;import javax.swing.*;public class UDPmessage extends JFrame implements ActionListenerprivate JTextArea text;private JTextField ipText;private JTextField sendText;private JButton button;private DatagramSocket socket;private JScrollBar vsBar;public UDPmessage()setTitle(UDP聊天程序);setBounds(100,100,400,300);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);setLayout(new BorderLayout();text = new JTextArea();text.setEditable(false);JScrollPane textPanel = new JScrollPane(text);vsBar = textPanel.getVerticalScrollBar();add(textPanel,BorderLayout.CENTER);JPanel panel = new JPanel();BorderLayout panelLayout = new BorderLayout();panelLayout.setHgap(5);panel.setLayout(panelLayout);ipText = new JTextField(120.95.160.);panel.add(ipText,BorderLayout.WEST);sendText = new JTextField();panel.add(sendText,BorderLayout.CENTER);button = new JButton(发送);panel.add(button,BorderLayout.EAST);add(panel,BorderLayout.SOUTH);setVisible(true);server();button.addActionListener(this);private void server()try socket = new DatagramSocket(9527);byte buf = new byte1024;final DatagramPacket dpl = new DatagramPacket(buf,buf.length);Runnable runnable = new Runnable()public void run()while(true)tryThread.sleep(100);socket.receive(dpl);int length = dpl.getLength();String message = new String(dpl.getData(),0,length);String ip = dpl.getAddress().getHostAddress();if(!InetAddress.getLocalHost().getHostAddress().equals(ip)text.append(ip+:n +message+n);vsBar.setValue(vsBar.getMaximum(); catch(IOException e)e.printStackTrace(); catch(InterruptedException e)e.printStackTrace();new Thread(runnable).start(); catch (SocketException e) e.printStackTrace();public void actionPerformed(ActionEvent ev)try String ip = ipText.getText();InetAddress address = InetAddress.getByName(ip);byte data = sendText.getText().getBytes();DatagramPacket dp = new DatagramPacket(data, data.length,address,9527);String myip = InetAddress.getLocalHost().getHostAddress();text.append(myip+:n +sendText.getText()+n);socket.send(dp);sendText.setText(null); catch (UnknownHostException e) / TODO Auto-generated catch blocke.printStackTrace();catch(IOException e)e.printStackTrace();public static void main(String args) JFrame frame = new UDPmessage();运行结果如下：实验题5 客户机之间通过服务器交换数据。 提示：为了适应传输各种类型的数据，必须统一客户机的数据格式，为此可以将数据封装在一个对象中，数据传输以对象的形式传输。因此必须定义一个数据封装的类，此类实现Serializable接口。实验代码:package cie.bing;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.io.Serializable;public class Feng implements Serializable String name;String password;int age;Overridepublic String toString() / TODO Auto-generated method stubreturn name+n+password+n+age;public Feng(String name,String password,int age)=name;this.password=password;this.age=age;public void setpassword(String password)this.password=password;public static void main(String args) throws IOException / TODO Auto-generated method stubFeng user=new Feng(li,3123,23);try Fi