Applet学习-1

来源：互联网发布：微商水印软件编辑：程序博客网时间：2024/06/04 08:18

1）在网页上用Applet实现画图的功能。

HTML内调用程序：

画图程序：

import java.awt.*;

import java.applet.*;

import java.awt.event.*;

public class MyApplet extends Applet

{

int orgX;

int orgY;

int endX;

int endY;

public void paint(Graphics g)

{

g.drawString("this is a simple applet",50,50);

}

public void init()

{

addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{

orgX=e.getX();//获得初始点的横坐标

orgY=e.getY();//获得初始点的纵坐标

}

public void mouseReleased(MouseEvent e)

{

endX=e.getX();//获得末点横坐标

endY=e.getY();//获得末点纵坐标

getGraphics().drawLine(orgX,orgY,endX,endY);

}

});

}

2）动画小程序

package applet;

import java.applet.*;

import java.awt.*;

public class MyApplet extends Applet implements Runnable{

int index=0;

String teString=null;

Image []imgs=new Image[3];

public void init()

{

for (int i = 0; i < 3; i++) {

imgs[i]=getImage(getCodeBase(),"zhaopin"+(i+1)+".jpg");

}

new Thread(this).start();

}

public void paint(Graphics g)

{

g.drawImage(imgs[index], 20, 20, this);

g.setFont(new Font(null,Font.ITALIC|Font.BOLD,20));

g.drawString(""+index, 10,20);

}

public void run() {

while (true) {

try {

Thread.sleep(100);

} catch (InterruptedException e) {

e.printStackTrace();

}

index=(index+1)%3;

repaint();

}

问题：图片未显示

3）通过网页传递给applet信息

在网页上设置变量：<param name=interval value=100>

在Applet上获得变量： time1=Integer.parseInt(getParameter("interval"));

4）网页上用户和Applet的交互

网页：

<html>

<head>

<title>MyHtml.html</title>

</head>

<applet

code="MyApplet1.class"

name="app"

width=500

height=300

</applet>

</center>

function setTest()

{

document.app.text=content.value;

document.app.repaint();

}

</script>

<input type=button value="改变文本"

onclick="setTest()">

</body>

</html>

Applet程序:

import java.applet.*;

import java.awt.*;

public class MyApplet1 extends Applet implements Runnable{

public String text="";

int index=0;

int time1=100;

Image []imgs=new Image[10];

public void init()

{

for (int i = 0; i < 10; i++) {

imgs[i]=getImage(getCodeBase(),"images//zhaopin"+(i+1)+".bmp");

}

time1=Integer.parseInt(getParameter("interval"));

//new Thread(this).start();

}

public void paint(Graphics g)

{

g.drawImage(imgs[index],20,20,this);

g.setFont(new Font(null,Font.ITALIC|Font.BOLD,30));

g.drawString(text, 50, 60);

}

public void run() {

while (true) {

try {

Thread.sleep(time1);

} catch (InterruptedException e) {

e.printStackTrace();

}

index=(index+1)%10;

repaint();

}