readapplettest.java

Java程序设计技巧与开发实例附书源代码。

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

public class ReadAppletTest
    extends Applet
    implements ActionListener
{
   private Button read = new Button("Read");
   private Label display = new Label("Java by Definition");
   public void init()
   {
      setLayout(new FlowLayout());
      add(read);
      read.addActionListener(this);
      add(display);
   }

   public void readFile()
   {
      try
      {
         URL url = new URL(getCodeBase(), "st.dat");
         InputStreamReader ins = new InputStreamReader(url.openStream());
         BufferedReader in = new BufferedReader(ins);
         display.setText(in.readLine());
         in.close();
      }
      catch (MalformedURLException murle)
      {
         System.err.println(murle);
      }
      catch (IOException ioe)
      {
         System.err.println(ioe);
      }
   }

   public void actionPerformed(ActionEvent ae)
   {
      if (ae.getSource() == read)
      {
         readFile();
      }
   }
}