//创建的User类型
public class User {
private String ausername; //用户名
private String apassword;//密码
private Float abalance;//余额
public User(){}
public User(String ausername,String apassword,Float abalance){
this.abalance = abalance;
this.apassword = apassword;
this.ausername = ausername;
}
public String getUsername() {
return ausername;
}
public void setUsername(String aname) {
this.ausername = aname;
}
public String getApassword() {
return apassword;
}
public void setApassword(String apassword) {
this.apassword = apassword;
}
public Float getAbalance() {
return abalance;
}
public void setAbalance(Float abalance) {
this.abalance = abalance;
}
}
import java.io.*;
import java.util.HashMap;
import java.util.Iterator;
//这个类是用来文件与集合 数据交换的
public class UserSystem {
//文件路径
private String pathname =null;
//数据导入到集合中操作
public UserSystem(String pathname){
this.pathname = pathname;
}
//创建一个集合 临时存储文件内容信息
public HashMap<String,User> loadFile (){
HashMap<String,User> userBox = new HashMap<String, User>();
File file = null;
FileReader fr = null;
BufferedReader br= null;
try {
//创建一个输入流，读取文件内容到集合中
file = new File(pathname);
fr = new FileReader(file);
br = new BufferedReader(fr);
String value = br.readLine(); //按行获取用户文件的信息
while (value!=null){
String [] valueUser = value.split("-");
//拆分 后存入集合中
User user = new User(valueUser[0],valueUser[1],Float.parseFloat(valueUser[2]));
userBox.put(user.getUsername(),user);
value = br.readLine();
}
} catch (IOException e) {
e.printStackTrace();
}finally {
try {
if(fr != null){
fr.close();
}
} catch (IOException e) {
e.printStackTrace();
}
try {
if(br != null){
br.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return userBox;
}
//将操作完的集合存入文件中
public void commit(HashMap<String,User> userBox){
File file = null;
FileWriter fw = null;
BufferedWriter bw= null;
try {
file = new File(pathname);
fw = new FileWriter(file);
bw = new BufferedWriter(fw);
Iterator <String> iterator = userBox.keySet().iterator();
while (iterator.hasNext()){
String name = iterator.next();//获取名字
User user = userBox.get(name);
//使用StringBuilder拼接，存入文件
StringBuilder stringBuilder = new StringBuilder(user.getUsername());
stringBuilder.append("-");
stringBuilder.append(user.getApassword());
stringBuilder.append("-");
stringBuilder.append(user.getAbalance());
bw.write(stringBuilder.toString());//将其转为string类型
bw.newLine();//换行
bw.flush();
}
} catch (IOException e) {
e.printStackTrace();
}finally {
try {
if(fw!=null){
fw.close();
}
} catch (IOException e) {
e.printStackTrace();
}
try {
if(bw!=null){
bw.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
import java.util.HashMap;
public class AtmDao {
//DAO作为一个层次---持久层 操作数据 读写数据
private UserSystem userSystem = new UserSystem("src\\bank_exercise\\UserData.txt");
private HashMap<String,User> userBox = userSystem.loadFile();
//更新文件内容---把集合内容存入文件中
//提供一个创建User对象的方法,更好的体现面向对象思想
public User objectModel(String username){
return userBox.get(username);
}
public void update(User user){
userBox.put(user.getUsername(),user);
userSystem.commit(userBox);
}
}
//这个类用来存放业务逻辑
public class AtmService {
private AtmDao atmDao = new AtmDao();
//登录
public String login(String username,String password){
User user = atmDao.objectModel(username);//获取用户名与密码
//如果为空，则证明 用户不存在
if(user!=null && user.getApassword().equals(password)){
return "登录成功";
}
return "登录失败";
}
//查看余额
public Float lookOver(String username){
User user = atmDao.objectModel(username);
return user.getAbalance();
}
//存入 deposit
public void deposit(String username,Float money){
User user = atmDao.objectModel(username);
user.setAbalance(user.getAbalance()+money);
atmDao.update(user);
System.out.println("存入成功");
}
//取出 takeOut
public void takeOut(String username,Float money){
User user = atmDao.objectModel(username);
if(user.getAbalance()>money){
user.setAbalance(user.getAbalance()-money);
atmDao.update(user);
System.out.println("已取款");
}else{
System.out.println("余额不足!");
}
}
//转账
public void transfer(String username,String username2,Float money) {
User user = atmDao.objectModel(username);
User newUser = atmDao.objectModel(username2);
if (user.getAbalance() > money) {
if (newUser != null) {
user.setAbalance(user.getAbalance() - money);
atmDao.update(user);
newUser.setAbalance(user.getAbalance() + money);
atmDao.update(newUser);
System.out.println("已向"+username2+"转账"+money+"元");
} else {
System.out.println("您输入的账户不存在");
}
} else {
System.out.println("余额不足");
}
}
}
import java.util.Scanner;
//可以参考以前的计算器代码，使其循环
public class Test {
public static void main(String[] args){
AtmService atmService = new AtmService();
Scanner input = new Scanner(System.in);
System.out.println("欢迎进入银行系统!");
System.out.println("请输入账号：");
String username = input.nextLine();
System.out.println("请输入密码：");
String password = input.nextLine();
String value = atmService.login(username,password);
if(value.equals("登录成功")){
System.out.println("登录成功");
System.out.println("请输入要执行的操作：\n1.存钱\n2.取钱\n3.转账\n4.查看余额\n5.退出");
String xuanxiang = input.nextLine();
switch (xuanxiang){
case "1":
System.out.println("请输入存款金额：");
Float money = input.nextFloat();
atmService.deposit(username,money);
break;
case "2":
System.out.println("请输入取款金额：");
Float money1 = input.nextFloat();
atmService.takeOut(username,money1);
break;
case"3":
System.out.println("请输入您需要转款的账户：");
String username2 = input.nextLine();
System.out.println("请输入转账金额：");
Float money2 = input.nextFloat();
atmService.transfer(username,username2,money2);
break;
case "4":
System.out.println("您的余额为："+atmService.lookOver(username));
break;
default:
System.out.println("正在退出，请收好您的物件.");
break;
}
}else {
System.out.println("登录失败");
}
}
}
