package?com.ostarsier.servlet;
import?java.io.IOException;
import?java.sql.ResultSet;
import?java.sql.SQLException;
import?java.util.ArrayList;
import?java.util.List;
import?java.util.Random;

import?javax.servlet.ServletException;
import?javax.servlet.http.HttpServlet;
import?javax.servlet.http.HttpServletRequest;
import?javax.servlet.http.HttpServletResponse;
/**
?*?抽獎概率算法來自：http://www.helloweba.com/view-blog-216.html
?*/
public?class?AwardServlet?extends?HttpServlet?{
	public?static?final?int?k?=?5;//?4個屬性
	public?void?doGet（HttpServletRequest?request?HttpServletResponse?response）
			throws?ServletException?IOException?{
		String?sql?=?null;??
	????DBHelper?db1?=?null;??
	????ResultSet?ret?=?null;?
		sql?=?“select?*from?lotto“;//SQL語句??
????????db1?=?new?DBHelper（sql）;//創建DBHelper對象??
????????try?{
????????????ret?=?db1.pst.executeQuery（）;//執行語句，得到結果集??
????????????int?sample?=?0;
????????????while?（ret.next（））?{
????????????????sample++;
????????????}??
??????
????????????object[][]?prizeArr?=?new?object[sample][k];??
????????????ret?=?db1.pst.executeQuery（）;//?特別重要，否則取到的全是0。因為執行上面的while（rs.next（））后，ResultSet對象的下標已指到0。??
????????????//?API：當生成ResultSet對象的Statement對象關閉、重新執行或用來從多個結果的序列獲取下一個結果時，ResultSet對象將自動關閉。??
????????????for?（int?i?=?0;?ret.next（）;?i++）?{
????????????????for?（int?j?=?0;?j?????????????????	prizeArr[i][j]?=?ret.getobject（j?+?1）;??
????????????????}??
????????????}??
????????????object?result[]?=?award（prizeArr）;//抽獎后返回角度和獎品等級
????????	response.setContentType（“text/html;charset=UTF-8“）;
????		response.getWriter（）.write（“{\“angle\“:\““+result[0]+“\“\“msg\“:\““+result[2]+“\“}“）;
????		System.out.println（“轉動角度:“+result[0]+“\t獎項ID:“+result[1]+“\t提示信息:“+result[2]）;
????????????ret.close（）;
????????????db1.close（）;//關閉連接??
????????}?catch?（SQLException?e）?{
????????????e.printStackTrace（）;
????????}??
		
	}
	
	//抽獎并返回角度和獎項
	public?object[]?award（object[][]?prizeArr）{
		//概率數組
		Integer?obj[]?=?new?Integer[prizeArr.length];
		for（int?i=0;i			obj[i]?=?（Integer）?prizeArr[i][4];
		}
		Integer?prizeId?=?getRand（obj）;?//根據概率獲取獎項id
		//旋轉角度
		int?angle?=?new?Random（）.nextInt（（Integer）prizeArr[prizeId][2]-（Integer）prizeArr[prizeId][1]）+（Integer）prizeArr[prizeId][1];
		String?msg?=?（String）?prizeArr[prizeId][3];//提示信息
		return?new?object[]{angleprizeIdmsg};
	}
	//根據概率獲取獎項
	public?Integer?getRand（Integer?obj[]）{
		Integer?result?=?null;
		try?{
			int??sum?=?0;//概率數組的總概率精度?
			for（int?i=0;i				sum+=obj[i];
			}
			for（int?i=0;i				int?randomNum?=?new?Random（）.nextInt（sum）;//隨機生成1到sum的整數
				if（randomNum					result?=?i;
					break;
				}else{
					sum?-=obj[i];
				}
			}
		}?catch?（Exception?e）?{
			e.printStackTrace（）;
		}
		return?result;
	}
	
	public?void?doPost（HttpServletRequest?request?HttpServletResponse?response）
			throws?ServletException?IOExcepti

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????604??2017-12-21?15:36??ChouJiang\.classpath

?????文件????????294??2017-12-21?15:36??ChouJiang\.mymetadata

?????文件???????1750??2017-12-21?15:36??ChouJiang\.project

?????文件????????500??2017-12-21?15:36??ChouJiang\.settings\.jsdtscope

?????文件???????1040??2017-12-21?15:36??ChouJiang\.settings\com.genuitec.eclipse.j2eedt.core.prefs

?????文件????????395??2017-12-21?15:36??ChouJiang\.settings\org.eclipse.jdt.core.prefs

?????文件????????459??2017-12-21?15:36??ChouJiang\.settings\org.eclipse.wst.common.component

?????文件????????252??2017-12-21?15:36??ChouJiang\.settings\org.eclipse.wst.common.project.facet.core.xml

?????文件?????????49??2017-12-21?15:36??ChouJiang\.settings\org.eclipse.wst.jsdt.ui.superType.container

?????文件??????????6??2017-12-21?15:36??ChouJiang\.settings\org.eclipse.wst.jsdt.ui.superType.name

?????文件???????3430??2017-12-21?15:36??ChouJiang\src\com\ostarsier\servlet\AwardServlet.java

?????文件???????1099??2017-12-21?15:36??ChouJiang\src\com\ostarsier\servlet\DBHelper.java

?????文件?????154511??2017-12-21?15:36??ChouJiang\WebRoot\files\activity-lottery-1.png

?????文件??????18045??2017-12-21?15:36??ChouJiang\WebRoot\files\activity-lottery-2.png

?????文件???????7705??2017-12-21?15:36??ChouJiang\WebRoot\files\activity-style.css

?????文件??????45587??2017-12-21?15:36??ChouJiang\WebRoot\files\disk.jpg

?????文件???????5555??2017-12-21?15:36??ChouJiang\WebRoot\files\jquery.easing.min.js

?????文件??????90518??2017-12-21?15:36??ChouJiang\WebRoot\files\jquery.min.js

?????文件??????11500??2017-12-21?15:36??ChouJiang\WebRoot\files\jQueryRotate.2.2.js

?????文件??????27297??2017-12-21?15:36??ChouJiang\WebRoot\files\start.png

?????文件???????2563??2017-12-21?15:36??ChouJiang\WebRoot\index.jsp

?????文件?????????36??2017-12-21?15:36??ChouJiang\WebRoot\meta-INF\MANIFEST.MF

?????文件???????3529??2017-12-21?15:36??ChouJiang\WebRoot\WEB-INF\classes\com\ostarsier\servlet\AwardServlet.class

?????文件???????1388??2017-12-21?15:36??ChouJiang\WebRoot\WEB-INF\classes\com\ostarsier\servlet\DBHelper.class

?????文件?????999810??2017-12-21?15:36??ChouJiang\WebRoot\WEB-INF\lib\mysql-connector-java-5.1.45-bin.jar

?????文件??????83787??2017-12-21?15:36??ChouJiang\WebRoot\WEB-INF\lib\servlet-api.jar

?????文件????????710??2017-12-21?15:36??ChouJiang\WebRoot\WEB-INF\web.xml

?????文件???????1749??2017-12-21?15:37??choujiang.sql

?????目錄??????????0??2017-12-21?15:36??ChouJiang\WebRoot\WEB-INF\classes\com\ostarsier\servlet

?????目錄??????????0??2017-12-21?15:36??ChouJiang\WebRoot\WEB-INF\classes\com\ostarsier

............此處省略17個文件信息