第三十二节（ Java-实现体育彩票开奖系统）

DoubleBallServlet.java里:



package com.tanzhou.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.tanzhou.util.DoubleBall;

public class DoubleBallServlet extends HttpServlet {

    /**
     * Constructor of the object.
     */
    public DoubleBallServlet() {
        super();
    }


    public void destroy() {
        super.destroy(); // Just puts "destroy" string in log
        // Put your code here
    }

    
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
           doPost(request,response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        DoubleBall db = new DoubleBall();
        String[] ball = db.doubleBall();
        
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("");
        out.println("");
        out.println("  ");
        out.println("  ");
        for(int i=0;i){
            if(i<6){
                out.println(""+ball[i]+"   ");
            }else{
                out.println("   "+ball[i]+"");
            }
            
        }
            
        out.println("  ");
out.println("");
out.flush();
out.close();
}
public void init() throws ServletException {
// Put your code here
 }
}
////////////////////////////////////////////////////////////////////
DoubleBall.java里：
package com.tanzhou.util;
import java.util.Arrays;
import java.util.Random;
public class DoubleBall {
public String[] doubleBall(){
Random r = new Random(); // 产生随机数
// 产生红球
String[] balls = {"01","02","03","04","05","06","07","08","09","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28","29","30","31","32","33"};
int ballsLen = balls.length; // 33

boolean[] used = new boolean[ballsLen]; // 标记位

String[] ball = new String[6]; // 装载6红球的数组
while(!checkNull(ball)){
if(checkNull(ball)){ // 判断数组是否已经装满6个红球
break;
}
// 取红球(只取6个红球)
for(int i=0;i){
int index = r.nextInt(ballsLen); // index =(0-32) 产生下标
if(used[index]){ //已经取出来的就进入到下一次循环，不能取重复的数字
continue;
}
used[index] = true; // 将已经取出的红球下标标记为不可取
ball[i] = balls[index];
if(checkNull(ball)){ // 判断数组是否已经装满6个红球
break;
}
}
}
Arrays.sort(ball);
System.out.println(Arrays.toString(ball));
ball = Arrays.copyOf(ball, ball.length+1); // 将数组的内容复制到新的数组中
// 取蓝球
int index = r.nextInt(16);
ball[ball.length-1] = balls[index];
System.out.println(Arrays.toString(ball));
return ball;
}
/**
* 判断是否是否取满六个红球
* @param ball
* @return
*/
public boolean checkNull(String[] ball){
int num = 0 ;
for(int k=0;k){
if(ball[k]==null){
num++;
}
}
if(num==0){
return true;
}
return false;
}
public static void main(String[] args){
DoubleBall db = new DoubleBall();
db.doubleBall();
}
}
//////////////////////////////////////////////////////////////
web.xml文件里;
"1.0" encoding="UTF-8"?>
"3.0"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

DoubleBallServlet
class>com.tanzhou.servlet.DoubleBallServletclass>


DoubleBallServlet
/DoubleColorBall


/////////////////////////////////////////////////////////////////

index.jsp文件里：
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

 

转载于:https://www.cnblogs.com/Deng1185246160/p/4279734.html