Java小项目——抽奖系统

一、需求分析

面板：用于放置两位抽奖号码——号码展示：1.数字 2.图片

鼠标监听器：按下鼠标，线程开始，开始号码随机滚动；释放鼠标，判断线程循环的值flag=0，号码停止滚动，获得中奖号码。

线程：线程开始，绘制遮挡框，号码number随机生成，绘制号码number，休眠0.1s（否则数字绘制过快，看不清楚）

二、系统实现

1、面板

package com.java7.choujiang0722;

import javax.swing.*;
import java.awt.*;

public class myFrame extends JFrame {
    //主程序入口
    public static void main(String args[]){
        System.out.println("抽奖");
        myFrame mf = new myFrame();
        mf.showUI();
    }
    //展示UI函数
    public void showUI(){
        this.setTitle("抽奖");
        this.setSize(600,600);
        this.setDefaultCloseOperation(3);
        this.setLocationRelativeTo(null);
        this.setVisible(true);
        //在JFrame组件上获取画笔
        Graphics g = this.getGraphics();
        //添加监听器，鼠标按压JFrame，开始抽奖；释放，结束抽奖
        addMouseListener mouse = new addMouseListener(g);
        this.addMouseListener(mouse);
    }
}

2、鼠标监听器

按下鼠标：线程开始

释放鼠标：线程结束

package com.java7.choujiang0722;

import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class addMouseListener extends MouseAdapter {

    public Graphics g;
    private myThread tr ;
    //构造函数，创建鼠标监听器时，将画笔传入addMouseListener
    public addMouseListener(Graphics g){
        this.g = g;
    }

    //鼠标按下，开始抽奖
    public void mousePressed(MouseEvent e) {
        System.out.println("开始抽奖");
        tr = new myThread(g);
        tr.start();
    }
    //鼠标释放，停止抽奖
    public void mouseReleased(MouseEvent e) {
        System.out.println("停止抽奖");
        tr.flag = false;//public，公用，此处可以直接调用
    }
}

3、线程

package com.java7.choujiang0722;

import javax.swing.*;
import java.awt.*;

public class myThread extends Thread {

    private Graphics g;
    public boolean flag = true;
    //构造函数，创建线程时候，将画笔传入myThread
    public myThread(Graphics g){
        this.g = g;
    }
    ImageIcon icon;

    public void run() {
        while(flag){
            System.out.println("run ： 抽奖中");
            //绘制抽奖数字
            g.setFont(new Font("宋体",Font.BOLD,100));
            g.setColor(Color.WHITE);
            g.fillRect(100,100,400,400);
            g.setColor(Color.RED);
            g.drawString("幸运抽奖",100,200);

            g.setColor(Color.CYAN);
            int number = (int)(Math.random()*10);
            g.drawString(number+"",240,330);
            //根据随机生成数字，获取0-9的图片；绘制图片
            icon = new ImageIcon(this.getClass().getResource(number+".png"));
            g.drawImage(icon.getImage(),150,200,120,200,null);

            number = (int)(Math.random()*10);
            g.drawString(number+"",300,330);
            icon = new ImageIcon(this.getClass().getResource(number+".png"));
            g.drawImage(icon.getImage(),350,200,120,200,null);
            try {
                sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        super.run();

    }
}