Java抽奖系统（附完整代码）

import java.util.Scanner;import java.util.ArrayList;import java.io.*;import java.util.StringTokenizer;
public class Dos {    static boolean logined=false;    public static void main(String[] args) {        User user=new User();        int k=0;        while( (k=Main(user))>=1&&k<5){            switch (k){                case 1:                    System.out.print((k=user.login(user))==-1?"此用户不存在!\n":"");                    System.out.print((k==-2)?"===<<警告>>用户：["+user.userName+"]已处于登录状态，无需重复登录！\n":"");                    break;                case 2:                    user.regist();                    break;                case 3:                    user.getLuckly();                    break;                default:System.exit(0);            }        }    }    static int Main(User user){        System.out.println("**********************************************");        System.out.println("********************主菜单********************");        System.out.println("**********************************************");        System.out.println("******          <1> 登   录             ******");        System.out.println("******          <2> 注   册             ******");        System.out.println("******          <3> 抽   奖             ******");        System.out.println("******          <4> 退   出             ******");        System.out.println("**********************************************");        System.out.println("==============================================");        System.out.println(logined ? "-[已登录]-  （1）用户名:"+user.userName+"   （2）用户账号:"+user.userId:"-[未登录]-   （1）用户名:NaN   （2）用户账号:NaN");        System.out.println("==============================================");        System.out.print("###===>请输入您的选择：");        return (new Scanner(System.in)).nextInt();    }}public class User{    String userName,userId,userPwd;    public User(){}    public User(String userName, String userId, String userPwd) {        this.userName = userName;        this.userId = userId;        this.userPwd = userPwd;    }    public String getUserName() {        return userName;    }    public void setUserName(String userName) {        if(!userName.equals("")) {            ArrayList temp;            this.userId=(temp=(new operatorFile(this.userName = userName)).getUserMess(0)).get(1);            this.userPwd=temp.get(2);        }    }    public String getUserId() {        return userId;    }    public String setUserId() {        String userId="";        while((new operatorFile(userId=String.valueOf ((int) (Math.random()*9000+1000)))).getUserMess(1).size()>0){ }        return (this.userId = userId);    }    public String getUserPwd() {        return userPwd;    }    public int login(User u) {        int inputTimes=3;        Scanner scanner=new Scanner(System.in);        operatorFile getUserMessage=new operatorFile();        System.out.print("======>请输入您的用户名：");        String uName="";        getUserMessage.setUser(uName=scanner.nextLine());        ArrayList userMess=getUserMessage.getUserMess(0);        if(userMess.size()<1)       return -1;//返回-1表示用户不存在        if (uName.equals(userName))     return -2;//返回-2表示用户重复登录        System.out.print("======>请输入您的登录密码：");        while(!scanner.next().equals(userMess.get(2))&&inputTimes>0)            System.out.print("===>密码输入错误！"+((--inputTimes)>0?"您还剩"+inputTimes+"次机会！":"三次机会已经用完了！输入任意退出"));        System.out.println(inputTimes>0?"==>登录成功！您本次输入密码"+(4-inputTimes)+"次！":"==>登录失败！");        setUserName(inputTimes>0?uName:"");        Dos.logined=inputTimes>0?true:false;        return 0;    }    public void regist() {        User u=new User();        Scanner scanner=new Scanner(System.in);        System.out.print("===>请输入新的用户名：");        String name;        while(new operatorFile(name=scanner.nextLine()).getUserMess(0).size() > 0)            System.out.print("已存在此用户,注册失败！\n===>请重新输入新的用户名：");        System.out.print("======>请设置您的(六位数字)登录密码：");        String regex = "[0-9]{6}", pwd;        while (!(pwd = scanner.nextLine()).matches(regex))            System.out.print("==>密码格式不正确，请重新设置您的(六位数字)登录密码：");        System.out.println("已为用户："+(u.userName=name)+" 生成唯一ID: "+(u.userPwd=pwd));        (new operatorFile()).writeUserMess(u);        System.out.println("=======>注册成功！");    }    public static HashMap lucklyUsers=new HashMap<>();    public void getLuckly() {        if (!Dos.logined)   {            System.out.println("===>警告：没有用户登录，无法抽奖！");            return ;        }        while(lucklyUsers.size()<5)        {            String id="";            ArrayList u;            while((u=(new operatorFile(id=String.valueOf ((int) (Math.random()*9000+1000)))).getUserMess(1)).size()<1){ }            lucklyUsers.put(u.get(1),u.get(0));        }        Iterator iterator=lucklyUsers.entrySet().iterator();        int no=1;        boolean LUCKLY=false;        System.out.println("====>恭喜以下用户获得幸运称号：");        while(iterator.hasNext()){            Map.Entry entry=(Map.Entry) iterator.next();            System.out.println("幸运用户["+(no++)+"]  用户名："+entry.getValue()+"   用户编号："+entry.getKey());            LUCKLY = entry.getKey().equals(this.userId) ? true : LUCKLY;        }        System.out.println(LUCKLY?"=========>恭喜您在本次抽奖中获得幸运称号！":"=========>很遗憾，今日您未获奖 ！-_-！");    }    public String toString(){        return this.userName+" "+this.userId+" "+this.userPwd;    }}public class operatorFile {    String user;    public void setUser(String user) {        this.user = user;    }    public operatorFile(String user) {        this.user = user;    }    public operatorFile() { }    public ArrayList getUserMess(int index){        ArrayList temp=new ArrayList();        File file=new File("user.txt");        String line="";        try{            BufferedReader br=new BufferedReader(new FileReader(file));            while ((line = br.readLine())!=null && line!="\n"){                temp.clear();                StringTokenizer sk=new StringTokenizer(line);                while (sk.hasMoreTokens()) {                    temp.add(sk.nextToken());                }                if (temp.get(index).equals(this.user))  break;            }        }        catch(IOException e){}        return (line==null)?new ArrayList():temp;    }    public void writeUserMess(User u){        try{            BufferedWriter bw=new BufferedWriter(new FileWriter(new File("user.txt"),true));            bw.write(u.toString()+"\n");            bw.close();        }        catch (IOException e){ }    }}