第11章 Java中的网络编程.doc

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1、第11章 Java中的网络编程实验1 显示网页中特定的超链接2模板代码 URLExample.javaimport javax.swing.*;import java.awt.*;import java.awt.event.*;import .*;import java.io.*;import java.util.regex.*;import javax.swing.event.*;class Win extends JFrame implements ActionListener, Runnable JButton button;URL url, newURL;JTextField text

2、;JEditorPane editPane;byte b = new byte118;Thread thread;Container con = null;JPanel p;public Win() text = new JTextField(20);editPane = new JEditorPane(); / 创建editPaneeditPane.setEditable(false); / editPane设置为不可编辑状态button = new JButton(确定);button.addActionListener(this);thread = new Thread(this);p

3、= new JPanel();p.add(new JLabel(输入网址:);p.add(text);p.add(button);con = getContentPane();con.add(new JScrollPane(editPane), BorderLayout.CENTER);con.add(p, BorderLayout.NORTH);setBounds(60, 60, 450, 300);setVisible(true);validate();setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);public void actionPerf

4、ormed(ActionEvent e) if (!(thread.isAlive()thread = new Thread(this);try thread.start(); catch (Exception ee) text.setText(我正在读取 + url);public void run() try int m = -1;editPane.setText(null);url = new URL(text.getSelectedText(); / 使用构造方法URL(String s)创建url，其中参数s由text中的文本指定InputStream in = url.openSt

5、ream(); / url返回输入流File file = new File(temp.html);ByteArrayOutputStream write = new ByteArrayOutputStream();while (m = in.read(b) != -1) write.write(b, 0, m);write.close();in.close();byte content = write.toByteArray();String str = new String(content);Pattern pattern;Matcher match;pattern = Ppile(*.育

6、.*,Pattern.CASE_INSENSITIVE);match = pattern.matcher(str);FileOutputStream out = new FileOutputStream(file);while (match.find() String strHREF = match.group();strHREF = + strHREF;out.write(strHREF.getBytes();out.close();newURL = file.toURL();con.removeAll();editPane = new JEditorPane(); / 创建editPane

7、editPane.setEditable(false); / editPane设置为不可编辑状态editPane.setPage(newURL); / editPane显示newURLcon.add(p, BorderLayout.NORTH);con.add(new JScrollPane(editPane), BorderLayout.CENTER);con.validate();validate();editPane.addHyperlinkListener(new HyperlinkListener() public void hyperlinkUpdate(HyperlinkEven

8、t e) if (e.getEventType() = HyperlinkEvent.EventType.ACTIVATED) try URL linkURL = e.getURL();editPane.setPage(linkURL); / editPane显示linkURL catch (IOException e1) editPane.setText( + e1);); catch (MalformedURLException e1) text.setText( + e1);return; catch (IOException e1) text.setText( + e1);return

9、;public class URLExample public static void main(String args) new Win();实验2 过滤网页中的内容2模板代码 Example.javaimport javax.swing.*;import java.awt.*;import java.awt.event.*;import .*;import java.io.*;import java.util.regex.*;import javax.swing.event.*;class Win extends JFrame implements ActionListener,Runna

10、ble JButton button; URL url, newURL; JTextField text; JEditorPane editPane; byte b=new byte118; Thread thread; Container con=null; JPanel p; public Win() text=new JTextField(20); editPane=new JEditorPane(); / 创建editPane editPane.setEditable(false); / editPane设置为不可编辑状态 button=new JButton(确定); button.

11、addActionListener(this); thread=new Thread(this); p=new JPanel(); p.add(new JLabel(输入网址:); p.add(text); p.add(button); con=getContentPane(); con.add(new JScrollPane(editPane),BorderLayout.CENTER); con.add(p,BorderLayout.NORTH); setBounds(60,60,460,380); setVisible(true); validate(); setDefaultCloseO

12、peration(JFrame.EXIT_ON_CLOSE); public void actionPerformed(ActionEvent e) if(!(thread.isAlive() thread=new Thread(this); try thread.start(); catch(Exception ee) text.setText(我正在读取+url); public void run() try int m=-1; editPane.setText(null); url= new URL(text.getSelectedText();/ 使用构造方法URL(String s)

13、创建url，其中参数s由text中的文本指定 InputStream in=url.openStream(); / url返回输入流 File file=new File(temp.html); ByteArrayOutputStream write=new ByteArrayOutputStream (); while(m=in.read(b)!=-1) write.write(b,0,m); write.close(); in.close(); byte content=write.toByteArray(); String str=new String(content); Pattern

14、 pattern; Matcher match; pattern=Ppile(,Pattern .CASE_INSENSITIVE); match=pattern.matcher(str); str=match.replaceAll(); byte cc=str.getBytes(); ByteArrayInputStream inByte=new ByteArrayInputStream(cc); FileOutputStream out=new FileOutputStream(file); byte dd=new byte1024; while(m=inByte.read(dd,0,10

15、24)!=-1) out.write(dd,0,m); out.close(); inByte.close(); newURL=file.toURL(); con.removeAll(); editPane=new JEditorPane();/ 创建editPane editPane.setEditable(false); / editPane设置为不可编辑状态 editPane.setPage(newURL);/ editPane显示newURL editPane.addHyperlinkListener(new HyperlinkListener() public void hyperl

16、inkUpdate(HyperlinkEvent e) if(e.getEventType()=HyperlinkEvent.EventType.ACTIVATED) try URL linkURL=e.getURL(); editPane.setPage(linkURL);/ editPane显示linkURL catch(IOException e1) editPane.setText(+e1); ); con.add(p,BorderLayout.NORTH); con.add(new JScrollPane(editPane),BorderLayout.CENTER); con.val

17、idate(); validate(); catch(MalformedURLException e1) text.setText(+e1); return; catch(IOException e1) text.setText(+e1); return; public class Example public static void main(String args) new Win(); 实验3 使用套接字传输数据2模板代码 客户端模板：Client.javaimport .*;import java.io.*;import java.awt.*;import java.awt.event

18、.*;import javax.swing.*;class Client extends JFrame implements Runnable, ActionListener JButton connection, computer;JTextField inputA, inputB, inputC;JTextArea showResult;Socket socket = null;DataInputStream in = null;DataOutputStream out = null;Thread thread;public Client() socket = new Socket();c

19、onnection = new JButton(连接服务器);computer = new JButton(求三角形面积);computer.setEnabled(false);inputA = new JTextField(0, 12);inputB = new JTextField(0, 12);inputC = new JTextField(0, 12);Box boxV1 = Box.createVerticalBox();boxV1.add(new JLabel(输入边A);boxV1.add(new JLabel(输入边B);boxV1.add(new JLabel(输入边C);B

20、ox boxV2 = Box.createVerticalBox();boxV2.add(inputA);boxV2.add(inputB);boxV2.add(inputC);Box baseBox = Box.createHorizontalBox();baseBox.add(boxV1);baseBox.add(boxV2);Container con = getContentPane();con.setLayout(new FlowLayout();showResult = new JTextArea(8, 18);con.add(connection);con.add(baseBox

21、);con.add(computer);con.add(new JScrollPane(showResult);computer.addActionListener(this);connection.addActionListener(this);thread = new Thread(this);setBounds(100, 100, 360, 310);setVisible(true);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);public void run() while (true) try double area = in.read

22、Double(); / in读入一个double型数据showResult.append(n三角形的面积:n + area);showResult.setCaretPosition(showResult.getText().length(); catch (IOException e) showResult.setText(与服务器已断开);computer.setEnabled(false);break;public void actionPerformed(ActionEvent e) if (e.getSource() = connection) try if (socket.isCon

23、nected() else InetAddress address = InetAddress.getByName(127.0.0.1);InetSocketAddress socketAddress = new InetSocketAddress(address, 4331);/ 创建端口为4331、地址为address的socketAddresssocket.connect(socketAddress); / socket建立和socketAddress的连接呼叫in = new DataInputStream(socket.getInputStream(); / socket返回输入流o

24、ut = new DataOutputStream(socket.getOutputStream(); / socket返回输出流computer.setEnabled(true);thread.start(); catch (IOException ee) if (e.getSource() = computer) try double a = Double.parseDouble(inputA.getText(), b = Double.parseDouble(inputB.getText(), c = Double.parseDouble(inputC.getText();if (a +

25、 b c & a + c b & b + c a) out.writeDouble(a); / out写入a，发送到服务器out.writeDouble(b); / out写入b，发送到服务器out.writeDouble(c); / out写入c，发送到服务器 else inputA.setText(你输入的3个数不构成三角形); catch (Exception ee) inputA.setText(请输入数字字符);public static void main(String args) Client win = new Client();服务器端模板：Server.javaimport

26、 java.io.*;import .*;public class Server public static void main(String args) ServerSocket server = null;ServerThread thread;Socket you = null;while (true) try server = new ServerSocket(4331); / 创建在端口4331上负责监听的/ ServerSocket对象 catch (IOException e1) System.out.println(正在监听);try you = server.accept()

27、; / server返回和客户端相连接的Socket对象System.out.println(客户的地址: + you.getInetAddress(); catch (IOException e) System.out.println(正在等待客户);if (you != null) new ServerThread(you).start(); else continue;class ServerThread extends Thread Socket socket;DataOutputStream out = null;DataInputStream in = null;String s

28、= null;ServerThread(Socket t) socket = t;try in = new DataInputStream(socket.getInputStream(); / socket返回输入流out = new DataOutputStream(socket.getOutputStream(); / socket返回输出流 catch (IOException e) public void run() while (true) double a = 0, b = 0, c = 0, area = 0;try a = in.readDouble(); / in读入一个do

29、uble型数据b = in.readDouble(); / in读入一个double型数据c = in.readDouble(); / in读入一个double型数据double p = (a + b + c) / 2.0;area = Math.sqrt(p * (p - a) * (p - b) * (p - c);out.writeDouble(area); / out写入area，发送到客户端 catch (IOException e) System.out.println(客户离开);break;实验4 基于UDP的图像传输2模板代码 客户端模板：Client.javaimport

30、.*;import java.awt.*;import java.awt.event.*;import javax.swing.*;import java.io.*;class Client extends JFrame implements Runnable, ActionListener JLabel label = new JLabel();JButton b = new JButton(获取图像);Container con;Client() super(I am a client);setSize(320, 200);setVisible(true);b.addActionListe

31、ner(this);con = getContentPane();con.add(b, BorderLayout.NORTH);con.add(new JScrollPane(label), BorderLayout.CENTER);Thread thread = new Thread(this);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);validate();thread.start(); / 线程负责接收数据public void actionPerformed(ActionEvent event) / 单击按扭发送数据byte b =

32、请发图像.trim().getBytes();try InetAddress address = InetAddress.getByName(127.0.0.1);DatagramPacket data = new DatagramPacket(b, b.length, address, 1234); / 创建数据包，该数据包的目标地址和端口分别是/ address和1234，其中的数据为数组b中的全部字节DatagramSocket mailSend = new DatagramSocket(); / 创建负责发送数据的DatagramSocket对象mailSend.send(data);

33、 / mailSend发送数据data catch (Exception e) public void run() DatagramPacket pack = null;DatagramSocket mailReceive = null;byte b = new byte8192;ByteArrayOutputStream out = new ByteArrayOutputStream();try pack = new DatagramPacket(b, b.length);mailReceive = new DatagramSocket(5678); / 创建在端口5678负责收取数据包的D

34、atagramSocket对象 catch (Exception e) try while (true) mailReceive.receive(pack);String message = new String(pack.getData(), 0, pack.getLength();if (message.startsWith(end)break;out.write(pack.getData(), 0, pack.getLength();byte imagebyte = out.toByteArray();out.close();Icon icon = new ImageIcon(image

35、byte);label.setIcon(icon);con.validate(); catch (IOException e) public static void main(String args) new Client();服务器端模板：Server.javaimport .*;import java.io.*;public class Server public static void main(String args) DatagramPacket pack = null;DatagramSocket mailReceive = null;ServerThread thread;byt

36、e b = new byte8192;InetAddress address = null;pack = new DatagramPacket(b, b.length);while (true) try mailReceive = new DatagramSocket(1234);/ 创建在端口1234负责收取数据包的DatagramSocket对象 catch (IOException e1) System.out.println(正在等待);try mailReceive.receive(pack);address = pack.getAddress(); / pack返回InetAddr

37、ess对象System.out.println(客户的地址: + address); catch (IOException e) if (address != null)new ServerThread(address).start();elsecontinue;class ServerThread extends Thread InetAddress address;DataOutputStream out = null;DataInputStream in = null;String s = null;ServerThread(InetAddress address) this.addre

38、ss = address;public void run() FileInputStream in;byte b = new byte8192;try in = new FileInputStream(a.jpg);int n = -1;while (n = in.read(b) != -1) DatagramPacket data = new DatagramPacket(b, b.length, address,5678); / 创建数据包，该数据包的目标地址和端口分别是address和5678，其中的数据为数组b中的前n个字节DatagramSocket mailSend = new DatagramSocket