[大数据]文件操作代替数据库模拟的ATM机

1.账户类：用来存放账户的卡号，密码和余额等信息，简单封装一下。然后设置了一个表示状态的字段，只有在字段的状态为true时才可以修改密码，存取款等操作。

package allclass;

import java.io.Serializable;
public class Account implements Serializable{

    private String cardid;
    private String password;
    private boolean userstatus=false;
    private double surplus=0.0;

    public Account() {
    }

    public Account(String cardid, String password) {
        this.cardid = cardid;
        this.password = password;
    }

    public String getCardid() {

        return cardid;
    }

    public void setCardid(String cardid) {

        this.cardid = cardid;
    }

    private String getPassword() {

        return password;
    }

    public void setPassword(String password) {
        if(this.userstatus)
        this.password = password;
        else
            System.out.println("请先登录！");
    }

    public boolean getUserstatus() {
        return userstatus;
    }

    public void setUserstatus(boolean userstatus) {
        this.userstatus = userstatus;
    }

    public double getSurplus() {
        if(this.userstatus)
            return surplus;
        else{
            System.out.println("请先登录！");
            return 0;
        }

    }

    public void setSurplus(double surplus) {
        if(this.userstatus)
            this.surplus = surplus;
        else
            System.out.println("请先登录！");

    }

    public boolean matchpassword(String password){
        if(this.getPassword().equals(password)){
            return true;
        }
        else{
            return false;
        }
    }

}

2.线程任务类：主要用来模拟和用户的交互，两个while循环来模拟登录/注册操作和存取款操作，用用户的卡号作为文件名，创建文件，并利用io流将对象写入文件，保存此账户类。注册后登录，校验用户输入的账号密码和文件中存储的是否一致。

package allclass;

import java.io.*;
import java.util.Scanner;

public class UserAccess implements Runnable {
    @Override
    public void run() {
        boolean usestatus=true;
        Scanner userinput=new Scanner(System.in);

        while(usestatus){
            System.out.println("登录请按1"+"\n"+"注册请按2"+"\n"+"退出请按3");
            String options123=userinput.next();
            //用户登录；
            System.out.println("正常输入");
            if(options123.equals("1")){
                System.out.println("请输入卡号：");
                String userid=userinput.next();
                System.out.println("请输入密码：");
                String userpassword=userinput.next();

                ObjectInputStream in = null;
                try {
                    //获取密码，匹配密码；
                    in = new ObjectInputStream(new FileInputStream("userdata\\"+userid));
                    Account user=(Account) in.readObject();
                    in.close();
                    if (user.matchpassword(userpassword)){
                        System.out.println("登陆成功");
                        user.setUserstatus(true);
                        //标记账号为登录状态，并且开始执行用户操作。
                        ObjectOutputStream out=new ObjectOutputStream(new FileOutputStream("userdata\\"+userid));
                        while(user.getUserstatus()){
                            System.out.println("存钱请按------>1"+"\n"+"取钱请按------>2"+"\n"+"修改密码请按--->3"+"\n"+"余额查询请按--->4\n"+"推出请按------>5");
                            String useraction123=userinput.next();
                            if (useraction123.equals("1")){
                                System.out.println("请输入存入数额（元）:");
                                double savemoney=userinput.nextDouble();
                                user.setSurplus(user.getSurplus()+savemoney);
                                System.out.println("存钱成功");
                            }

                            else if(useraction123.equals("2")){
                                System.out.println("请输入取款数额（元）:");
                                double takemoney=userinput.nextDouble();
                                user.setSurplus(user.getSurplus()-takemoney);
                                System.out.println("取款成功");
                            }

                            else if (useraction123.equals("3")){
                                System.out.println("请输入新密码:");
                                String newpassword=userinput.next();
                                user.setPassword(newpassword);
                                System.out.println("修改成功");
                            }

                            else if (useraction123.equals("5")){
                                user.setUserstatus(false);
                            }

                            else{
                                System.out.println(user.getSurplus());
                            }


                        }
                        out.writeObject(user);
                        out.close();
                    }
                    else{
                        continue;
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }

            }
            //用户注册；
            else if(options123.equals("2")){
                System.out.println("请设置卡号：");
                String userid=userinput.next();
                System.out.println("请设置密码：");
                String userpassword=userinput.next();
                Account newuser=new Account(userid,userpassword);

                try {
                    ObjectOutputStream out=new ObjectOutputStream(new FileOutputStream("userdata\\"+userid));
                    out.writeObject(newuser);
                    System.out.println("注册成功，请牢记您的账号密码！");
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            //退出；
            else{
                usestatus=false;
                continue;
            }

        }
    }
}

3.主类：将任务线程放入线程池，开始运行线程。

package allclass;

import java.util.Timer;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

public class AtuoBank {
    public static void main(String[] args){
        ExecutorService atm=new ThreadPoolExecutor(1,2,3, TimeUnit.DAYS,new ArrayBlockingQueue<>(5));
        UserAccess zxr=new UserAccess();
        atm.execute(zxr);
    }
}

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