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  • 第三十二节( Java-实现体育*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("<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">");
            out.println("<HTML>");
            out.println("  <HEAD><TITLE>DoubleColorBall</TITLE></HEAD>");
            out.println("  <BODY style='text-align:center;'>");
            for(int i=0;i<ball.length;i++){
                if(i<6){
                    out.println("<font style='color:red;font-weight:bold'>"+ball[i]+"</font>&nbsp;&nbsp;&nbsp;");
                }else{
                    out.println("&nbsp;&nbsp;&nbsp;<font style='color:blue;font-weight:bold''>"+ball[i]+"</font>");
                }
                
            }
                
            out.println("  </BODY>");
            out.println("</HTML>");
            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<ball.length;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<ball.length;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;
    
    
    <?xml version="1.0" encoding="UTF-8"?>
    <web-app version="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">
      <servlet>
        <servlet-name>DoubleBallServlet</servlet-name>
        <servlet-class>com.tanzhou.servlet.DoubleBallServlet</servlet-class>
      </servlet>
    
      <servlet-mapping>
        <servlet-name>DoubleBallServlet</servlet-name>
        <url-pattern>/DoubleColorBall</url-pattern>
      </servlet-mapping>
    
    </web-app>
    
    /////////////////////////////////////////////////////////////////
    
    
    index.jsp文件里:
    <%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
    <script type="text/javascript">
        location.href = "${pageContext.request.contextPath}/DoubleColorBall";
    </script>
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  • 原文地址:https://www.cnblogs.com/Deng1185246160/p/4279734.html
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