udpsend.java

来自「java网络高级编程的配套源码,java网络高级编程为清华出版社出版.」· Java 代码 · 共 83 行

/*源代码清单8-5*/

import java.net.*;
import java.awt.*;
import borland.jbcl.layout.*;
import java.awt.event.*;

public class UDPSend extends Frame implements ActionListener
{
  VerticalFlowLayout verticalFlowLayout1 = new VerticalFlowLayout();
  TextField textField1 = new TextField();
  Button button1 = new Button();
  Button button2 = new Button();

  public UDPSend()
  {
    try
    {
      jbInit();
    }
    catch (Exception e)
    {
      e.printStackTrace();
    }
  }

  public void actionPerformed(ActionEvent e)
  {
    Component com=(Component)e.getSource();
    if(com.equals(button1))
      sendData();
    else if(com.equals(button2))
      System.exit(0);
    else
      sendData();
  }

  void sendData()
  {
    try
    {
      String msg=textField1.getText();
      if(msg.equals(""))
        return;
      textField1.setText("");
      InetAddress address=InetAddress.getByName("10.15.43.216");
      int len=msg.length();
      byte[] message=new byte[len];
      msg.getBytes(0,len,message,0);
      DatagramPacket packet=new DatagramPacket(message,len,address,9999);
      DatagramSocket socket=new DatagramSocket();
      socket.send(packet);
    }
    catch(Exception e)
    {
    }
  }

  public static void main(String[] args)
  {
    UDPSend send=new UDPSend();
    send.setLocation(100,100);
    send.setSize(200,120);
    send.show();
  }

  private void jbInit() throws Exception
  {
    this.setTitle("发送数据报");
    button1.setLabel("发送");
    button2.setLabel("退出");
    this.setLayout(verticalFlowLayout1);
    this.add(textField1, null);
    this.add(button1, null);
    this.add(button2, null);
    button1.addActionListener(this);
    button2.addActionListener(this);
    textField1.addActionListener(this);
  }
  
}