frame1.java~37~

java灵感设计

package udpserver;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.net.*;
import java.util.*;
import java.io.*;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2002</p>
 * <p>Company: </p>
 * @author unascribed
 * @version 1.0
 */

public class Frame1 extends JFrame {
  JPanel contentPane;
    byte[] buf =new byte[256];
  DatagramPacket packet;
  InetAddress address;
  int port;
  String dString=null;
  private DatagramSocket socket=null;
  Button button1 = new Button();
  TextField textField1 = new TextField();
  Label label1 = new Label();

  //Construct the frame
  public Frame1() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
      socket=new DatagramSocket();
      textField1.setText(String(socket.getLocalPort()));
    }
    catch(Exception e) {
      e.printStackTrace();
    }

  }
  //Component initialization
  private void jbInit() throws Exception  {
    //setIconImage(Toolkit.getDefaultToolkit().createImage(Frame1.class.getResource("[Your Icon]")));
    contentPane = (JPanel) this.getContentPane();
    button1.setLabel("开始监听");
    button1.setBounds(new Rectangle(111, 183, 141, 43));
    button1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button1_actionPerformed(e);
      }
    });
    contentPane.setLayout(null);
    this.setSize(new Dimension(400, 300));
    this.setTitle("UDP服务器");
    textField1.setText("");
    textField1.setBounds(new Rectangle(78, 101, 208, 31));
    label1.setText("UDP服务器监听端口号为:");
    label1.setBounds(new Rectangle(81, 49, 188, 29));
    contentPane.add(label1, null);
    contentPane.add(textField1, null);
    contentPane.add(button1, null);
  }
  //Overridden so we can exit when window is closed
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }

  public void run()
  {
  if(socket==null)
  return;
  while(true)
  {
  try{
  packet=new DatagramPacket(buf,256);
  socket.receive(packet);
  address=packet.getAddress();
  port=packet.getPort();
  dString= new String("Information form UDP Server");
  dString.getBytes(0,dString.length(),buf,0);
  packet=new DatagramPacket(buf,buf.length,address,port);
  socket.send(packet);
  finalize();
  }
  catch(IOException e)
  {
  System.err.println("IO异常:"+e);
  e.printStackTrace();
  }
  }
  }

  protected void finalize()
  {
  if(socket!=null){
  socket.close();
  socket=null;
  textField1.setText("成功关闭服务器端口!");
  }
  }

  void button1_actionPerformed(ActionEvent e) {
      run();
  }
  }