Java实现ATM机操作系统

本文实例为大家分享了Java实现ATM机操作系统的具体代码，供大家参考，具体内容如下

用IO流操作txt文件作为数据库模拟实现一个ATM业务操作系统---->网上银行，实现登录，查询余额，存款，取款，转账，开户，销户等业务功能
看代码

1.用户类----->User:

package atm;

import java.io.Serializable;

public class User implements Serializable{
 
 //建议除了私有属性 无参数有参数构造方法 属性对应的get、set方法
  //建议类实现一个序列化接口 添加一个序列化版本号
 private static final long serialVersionUID = 1L;
 
 //只是为了记录数据库中的一行信息  账号 密码 余额
 private String aName;
 private String aPassword;
 private Float aSalary;
 public User() {}
 public User(String aName,String aPassword,Float aSalary) {
  this.aName = aName;
  this.aPassword = aPassword;
  this.aSalary = aSalary;
 }
 public String getaName() {
  return this.aName;
 }
 public void setaName(String newName) {
  this.aName = newName;
 }
 public String getaPassword() {
  return this.aPassword;
 }
 public void setaPassword(String newPassword) {
  this.aPassword = newPassword;
 }
 public Float getSalary() {
  return this.aSalary;
 }
 public void setSalary(Float newSalary) {
  this.aSalary = newSalary;
 }
}

2.操作IO的类------>FileLoadAndCommit:

package atm;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;

//操作文件
public class FileLoadAndCommit {
 
 //文件路径
 private String pathName = null;
 public FileLoadAndCommit(String pathName) {
  this.pathName = pathName;
 }
 
 //读取文件装入集合
 public HashMap<String,User> loadFile(){
  //临时的存储空间，将文件中读取的数据存储以便于修改
  HashMap<String,User> userBox = new HashMap<String,User>();
  //IO流读取
  FileReader fr = null;
  BufferedReader br = null;
  try {
   fr = new FileReader(new File(pathName));
   br = new BufferedReader(fr);
   String code = br.readLine();//读取一行
   //循环遍历所有行  按"-"拆分一行的数据，作为User存入集合 
   while(code != null) {
    String[] value = code.split("-");
    User user = new User(value[0],value[1],Float.parseFloat(value[2]));
    userBox.put(user.getaName(),user);
    code = br.readLine();
   }
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }finally {
   try {
    //如果流管道存在，才关闭
    if(fr != null) {
     fr.close();
    }
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   try {
    if(br != null) {
     br.close();
    }
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }
  return userBox;
 }
 
 //将集合更新入文件
 public void commit(HashMap<String,User> userBox) {
  //IO流写入
  FileWriter fw = null;
  BufferedWriter bw = null;
  try {
   fw = new FileWriter(new File(pathName));
   bw = new BufferedWriter(fw);
   
   //迭代集合内所有账户名 按账户名找到对应的User对象
   Iterator<String> names = userBox.keySet().iterator();
   while(names.hasNext()) {
    String name = names.next();
    User user = userBox.get(name);
    
    //用StringBuilder拼接字符串
    StringBuilder sBuilder = new StringBuilder();
    sBuilder.append(user.getaName());
    sBuilder.append("-");
    sBuilder.append(user.getaPassword());
    sBuilder.append("-");
    sBuilder.append(user.getSalary());
    bw.write(sBuilder.toString());//将拼好的一行数据写入文件
    bw.flush();//刷新
    bw.newLine();//换行
   }
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }finally {
   //必须先关闭BufferedWriter再关闭FileWrite，否贼会抛异常java.io.IOException: Stream closed
   try {
    if(bw != null) {
     bw.close();
    }
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   try {
    if(fw != null) {
     fw.close();
    }
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }
 }
}

3.负责读写的类----->AtmDao:

package atm;

import java.util.HashMap;

//持久化,负责读写数据,缓存
public class AtmDao {
 private FileLoadAndCommit flac = new FileLoadAndCommit("D:\\test\\ATM\\testATM.txt");
 HashMap<String,User> userBox = flac.loadFile();
 //获取一个User对象
 public User selectOne(String aName) {
  return userBox.get(aName);
 }
 //更新文件数据
 public void update(User user) {
  userBox.put(user.getaName(),user);
  flac.commit(userBox);
 }
 //删除文件数据
 public void delete(User user) {
  userBox.remove(user.getaName(),user);
  flac.commit(userBox);
 }
}

4.负责业务逻辑的类------>ATMService:

package atm;

import java.util.HashMap;

//负责业务逻辑 判断 比较 计算
public class ATMService {
 //登录
 private AtmDao dao = new AtmDao();
 public String login(String aName,String aPassword) {
  User user = dao.selectOne(aName);
  if(user!=null) {
   if(aPassword.equals(user.getaPassword())) {
    return "登录成功";
   }
  }
  return "用户名或密码错误";
 }
 //查询余额
 public Float inquiry(String aName) {
  User user = dao.selectOne(aName);
  return user.getSalary();
 }
 //存款
 public void addMoney(String aName,Float addMoney) {
  User user = dao.selectOne(aName);//获取该用户对象
  user.setSalary(user.getSalary()+addMoney);//用User的set方法修改用户金额
  dao.update(user);//更新文件数据
  System.out.println("存款成功\n");
 }
 //取款
 public void getMoney(String aName,Float getMoney) {
  User user = dao.selectOne(aName);//获取该用户对象
  if(getMoney <= user.getSalary()) {//如果要取出的钱大于余额就不能取了
   user.setSalary(user.getSalary()-getMoney);
   dao.update(user);
   System.out.println("取款成功\n");
  }else {
   System.out.println("对不起,您的余额不足\n");
  }
 }
 //转账
 public void transferMoney(String outName,String inName,Float transferMoney) {
  User outUser = dao.selectOne(outName);//转出用户
  User inUser = dao.selectOne(inName);//转入用户
  if(inUser!=null) {//转入用户存在
   if(outUser!=inUser) {//转出和转入用户不能是同一个用户
    if(transferMoney <= outUser.getSalary()) {//转出金额大于余额就不能转了
     outUser.setSalary(outUser.getSalary()-transferMoney);//修改转出用户余额
     inUser.setSalary(inUser.getSalary()+transferMoney);//修改转入用户余额
     //更新文件数据
     dao.update(outUser);
     dao.update(inUser);
     System.out.println("转账成功\n");
    }else {
     System.out.println("对不起"+outName+",您的余额不足\n");
    }
   }else {
    System.out.println("对不起,不能给自己转账,您可以试试使用存款业务\n");
   }
  }else {
   System.out.println("对不起,您输入的用户不存在\n");
  }
 }
 //开户
 public User creatUser(String aName,String aPassword,Float aSalary) {
  User user = new User(aName,aPassword,aSalary);
  dao.update(user);//更新文件数据
  System.out.println("用户"+aName+",创建成功");
  return user;
 }
 //销户
 public void deleteUser(String aName) {
  User user = dao.selectOne(aName);//获取名为aName的用户
  if(user != null) {//判断该用户是否在文件数据内存在
   dao.delete(user);
   System.out.println("用户"+aName+",删除成功");
  }else {
   System.out.println("要销毁的账户不存在");
  }
 }
}

5.测试类----->TestMain:

package atm;

import java.util.Scanner;

public class TestMain {
 public static void main(String[] args) {
  ATMService atmService = new ATMService();//获取执行业务的方法
  Scanner input = new Scanner(System.in);
  System.out.println("欢迎进入ATM机系统");
  System.out.println("请选择要操作的业务:\n1.用户登录\n2.开户\n3.按任意键退出");
  String choice = input.next();
  if(choice.equals("1")) {
   System.out.println("请输入账户名");
   String name = input.next();
   System.out.println("请输入密码");
   String password = input.next();
   String afterLogin = atmService.login(name,password);//判断输入的账户名密码是否正确
   if(afterLogin.equals("登录成功")) {//if正确则登录成功
    System.out.println("登录成功！\n");
    //使用while循环反复进行switch执行操作业务
    while(true) {
     System.out.println("请选择服务项目:");
     System.out.println("1.查询\n2.存款\n3.取款\n4.转账\n5.销户\n(按q退出系统)");
     String option = input.next();
     switch (option) {
     case "1":
      //查询
      Float money = atmService.inquiry(name);
      System.out.println("尊敬的客户,您的余额为"+money+"元\n");
      break;
     case "2":
      //存款
      System.out.println("请输入存款金额");
      Float addMoney = input.nextFloat();
      atmService.addMoney(name,addMoney);
      break;
     case "3":
      //取款
      System.out.println("请输入取款金额");
      Float getMoney = input.nextFloat();
      atmService.getMoney(name,getMoney);
      break;
     case "4":
      //转账
      System.out.println("请输入转账用户ID:");
      String id = input.next();
      System.out.println("请输入转账金额:");
      Float transferMoney = input.nextFloat();
      atmService.transferMoney(name,id,transferMoney);
      break;
     case"5":
      //销户
      System.out.println("您确定要销毁当前账户吗账户内所有余额都会消失\nYes/No\n");
      String decision = input.next();
      if(decision.equalsIgnoreCase("yes")) {
       atmService.deleteUser(name);//删除当前user数据
      }else if(decision.equalsIgnoreCase("no")){
        break;
      }
      break;
     case "q":
      System.out.println("已退出ATM机系统,感谢您的使用!!!");
      System.exit(0);//退出程序
      break;
     default:
      System.out.println("请输入正确的指令\n");
      break;
     }
    }
   }else {
    System.out.println(afterLogin);
   }
  }else if(choice.equals("2")){
   //开户
   System.out.println("请设置您的用户名");
   String newUserName = input.next();
   System.out.println("请设置您的密码");
   String newPassword = input.next();
   User newUser = atmService.creatUser(newUserName, newPassword, 0.0F);
   System.out.println("\n初始余额为"+newUser.getSalary()+"元");
  }else {
   System.out.println("已退出ATM机系统,感谢您的使用!!!");
  }
 }
}

部分运行结果：

1.账户登录

2.查询

3.存款

4.退出

作为数据库的txt文件：

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持源码搜藏网。