5.txt

编写小程序

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.net.*;
import javax.swing.*;

public class Applet1 extends Applet {
Button b1,b2;
TextField tf;
Image urlImg;
URL imgurl;
Panel p1;//面板用来放组件：按钮、标签、文本框。
int i;

   public void init(){
//获取媒体资源
getResource();
urlImg=getImage(imgurl);//加载图片
setLayout(new BorderLayout());
p1=new Panel();
b1=new Button("按钮1");
b1.setBackground(Color.red);
b1.addActionListener(new ActionListener(){
 public void actionPerformed(ActionEvent event){
   i=1;
    repaint();
}
});
b2=new Button("按钮2");
b1.setBackground(Color.red);
tf=new TextField(20);
p1.add(b1); 
p1.add(b2);
p1.add(tf);
 p1.setBackground(Color.white);
 add(p1,BorderLayout.SOUTH);
}

public void paint(Graphics g){
	super.paint(g);
	if(i==1)
	g.drawImage(urlImg,1,1,this);
	}
private void getResource(){
   try{
    imgurl=new URL(getCodeBase(),"t-mac.bmp");
  }catch(MalformedURLException e) {
e.printStackTrace();
   }
}
}


新建HTML文件，输入<applet code ="Applet1.class" width="500" height="500"></applet>
从而让applet在web中运行