直接上效果图：
目前的样子还可以美化，期待其他童鞋效果图 0.0
下边是代码
package cn.com.entity;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.image.MemoryImageSource;
import java.util.Random;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.Timer;
public class Rain extends JDialog implements ActionListener {
private static final long serialVersionUID = 1549334578038217282L;
private Random random = new Random();
private Dimension screenSize;
private JPanel graphicsPanel;
// 行高,列宽
private final static int gap = 20;
// 存放雨点顶部的位置信息(marginTop)
private int[] posArr;
// 行数
private int lines;
// 列数
private int columns;
public Rain() {
initComponents();
}
private void initComponents() {
setLayout(new BorderLayout());
graphicsPanel = new GraphicsPanel();
add(graphicsPanel, BorderLayout.CENTER);
// 设置光标不可见
Toolkit defaultToolkit = Toolkit.getDefaultToolkit();
Image image = defaultToolkit.createImage(new MemoryImageSource(0, 0, null, 0, 0));
Cursor invisibleCursor = defaultToolkit.createCustomCursor(image, new Point(0, 0), "cursor");
setCursor(invisibleCursor);
// ESC键退出
KeyPressListener keyPressListener = new KeyPressListener();
this.addKeyListener(keyPressListener);
// this.setAlwaysOnTop(true);
// 去标题栏
this.setUndecorated(true);
// 全屏
this.getGraphicsConfiguration().getDevice().setFullScreenWindow(this);
this.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
setVisible(true);
screenSize = Toolkit.getDefaultToolkit().getScreenSize();
lines = screenSize.height / gap;
columns = screenSize.width / gap;
posArr = new int[columns + 1];
random = new Random();
for (int i = 0; i < posArr.length; i++) {
posArr[i] = random.nextInt(lines);
}
// 每秒10帧
new Timer(100, this).start();
}
/**
* @return 随机字符
*/
private char getChr() {
return (char) (random.nextInt(94) + 33);
}
@Override
public void actionPerformed(ActionEvent e) {
graphicsPanel.repaint();
}
private class GraphicsPanel extends JPanel {
private static final long serialVersionUID = 3043939524168375053L;
@Override
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
g2d.setFont(getFont().deriveFont(Font.BOLD));
g2d.setColor(Color.BLACK);
g2d.fillRect(0, 0, screenSize.width, screenSize.height);
// 当前列
int currentColumn = 0;
for (int x = 0; x < screenSize.width; x += gap) {
int endPos = posArr[currentColumn];
g2d.setColor(Color.CYAN);
g2d.drawString(String.valueOf(getChr()), x, endPos * gap);
int cg = 0;
for (int j = endPos - 15; j < endPos; j++) {
// 颜色渐变
cg += 20;
if (cg > 255) {
cg = 255;
}
g2d.setColor(new Color(0, cg, 0));
g2d.drawString(String.valueOf(getChr()), x, j * gap);
}
// 每放完一帧，当前列上雨点的位置随机下移1~5行
posArr[currentColumn] += random.nextInt(5);
// 当雨点位置超过屏幕高度时，重新产生一个随机位置
if (posArr[currentColumn] * gap > getHeight()) {
posArr[currentColumn] = random.nextInt(lines);
}
currentColumn++;
}
}
}
private class KeyPressListener extends KeyAdapter {
@Override
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_ESCAPE) {
System.exit(0);
}
}
}
public static void main(String[] args) {
new Rain();
}
}
这是 html 版的
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
canvas {
display: block;
}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<script>
function $(id) {
return document.getElementById(id);
}
//画布 的大小设置
var mywindow = window.screen;
var canvas = $("canvas");
canvas.width = mywindow.width;
canvas.height = mywindow.height;
//要输出的信息
var str = "0123456789";
str = str.split("");
var fontSize = 16;//输出字体的大小
//每列显示多少个信息
var cols = canvas.width / fontSize;
//数组，统计下落的位置
var drops = [];
for (var i = 0; i < cols; i++) {
drops[i] = 1;
}
var ctx = canvas.getContext("2d");
function draw() {
/**
*这的黑客帝国：
* 获取页面的 大小 包括宽度和高度
* 用cols获取能够宽度加载列数
* drops加载每一列的位置
* drops[2]=10 2为第二排的 top为10
*/
ctx.fillStyle = "rgba(0,0,0,0.05)";
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.fillStyle = "green";
ctx.font = fontSize + "px arial";
for (var i = 0; i < cols; i++) {
var text = str[Math.floor(Math.random() * (str.length))];
// console.info("x-"+i*fontSize);
// console.info("y-"+drops[i]*fontSize);
ctx.fillText(text, i * fontSize, drops[i] * fontSize);
if (drops[i] * fontSize > canvas.height || Math.random() > 0.95)
drops[i] = 0;//把位置恢复到最上面
//控制下落的位置
drops[i]++;
}
}
setInterval(draw, 33);
</script>
</body>
</html>
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