JAVA实现用户抽奖功能（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<String> 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<String> 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<String,String> 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<String> 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<String> getUserMess(int index){
  ArrayList<String> temp=new ArrayList<String>();
  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<String>():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){ }
 }
}