标签：String rs System Navicat println HashMap public Bank out

第一次学Java，写的比较拙劣

test类

package bank;

import java.util.Scanner;

public class test {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		System.out.println("0.退出\t1.管理员\t2.普通用户\n请选择你的身份:");
		int identity = sc.nextInt();
		
		MySQL mysql = new MySQL();
		SqlUser sqluser = new SqlUser();
		mysql.runOneTime();//载入全部信息只运行一次
		
		if (identity == 1) {
			mysql.SqlAdminLogin();
			mysql.SqlAdminQuery();
		} else if(identity == 2){
			sqluser.SqlUserLogin();
		}else if(identity == 0) {
			System.out.println("****感谢使用，期待下次合作！****");
			System.exit(0);	
		}else {
			System.out.println("出错误啦~");
		}
		sc.close();
	}
	
}

 SqlUser类

package bank;

import java.sql.*;
import java.util.*;

public class SqlUser {
	Connection conn = null;
	Statement stmt = null;
	ResultSet rs = null;
	Scanner sc = new Scanner(System.in);
	int CardID = 0;

	public void SqlUserLogin() throws SQLException {

		int psw;
		try {
			Class.forName("com.mysql.cj.jdbc.Driver");
			String url = "jdbc:mysql://localhost:3306/BankDB?useSSL=false&&serverTimezone=GMT%2B8";
			String username = "root";
			String password = "078772";
			conn = DriverManager.getConnection(url, username, password);
			stmt = conn.createStatement();

			System.out.print("请输入你的卡号:");
			CardID = sc.nextInt();
			System.out.print("请输入你的密码:");
			psw = sc.nextInt();

			String sqlSingle = "select * from BankDB where CardID = " + CardID + " AND Password =" + psw + "";

			rs = stmt.executeQuery(sqlSingle);
			String name = null;
			String sex = null;
			while (rs.next()) {

				name = rs.getString("Username");
				sex = rs.getString("Sex");
			}
			while (true) {
				if (name == null) {
					System.out.println("**您还没有办理服务或输入有错哦！**\n您要创建新用户吗？\n1.不，我再试试\t2.好\t3.直接退出");
					int choice = sc.nextInt();
					switch (choice) {
					case 1: {
						SqlUserLogin();
						break;
					}
					case 2: {
						inputWrite();
						break;
					}
					case 3: {
						System.out.println("***即将退出系统***");
						System.exit(0);
					}
					default: {
						System.out.println("***输入错误***");
					}
					}
				} else {
					System.out.println("Yuelin智能ATMer欢迎" + name + sex + "士！");
					System.out.print("1.存款\n2.取款\n3.查询\n4.修改密码\n0.退出\n请输入您的选择:");
					int userChoice = sc.nextInt();
					switch (userChoice) {
					case 1: {
						SqlUserSave();
						break;
					}
					case 2: {
						SqlUserWithdraw();
						break;
					}
					case 3: {
						SqlUserQuery();
						break;
					}
					case 4: {
						SqlUserChangePsw();
						break;
					}
					case 0: {

						System.exit(0);
					}
					}
				}
			}
		} catch (Exception e) {
			System.out.println("这里有一些错误哦~");
			e.printStackTrace();
		} finally {
			if (rs != null)
				rs.close();
			if (stmt != null)
				stmt.close();
			if (conn != null)
				conn.close();
		}
	}

	public void inputWrite() throws SQLException {

		String name = null, sex = null;
		int psw, id = 0;
		int count = 0, newcardId = 0;

		try {
			Class.forName("com.mysql.cj.jdbc.Driver");
			String url = "jdbc:mysql://localhost:3306/BankDB?useSSL=false&&serverTimezone=GMT%2B8";
			String username = "root";
			String password = "078772";
			conn = DriverManager.getConnection(url, username, password);
			stmt = conn.createStatement();

			String sqlFirst = "select count(1) from BankDB ID";
			rs = stmt.executeQuery(sqlFirst);
			while (rs.next()) {
				count = rs.getInt(1);
			}

			if (count == 0) {
				newcardId = 67400;
			} else {
				id = count + 1;
				newcardId = 67400 + id;
			}
			String blanckFirst = sc.nextLine();
			System.out.println("请输入你要创建的用户名:");
			name = sc.nextLine();
			System.out.println("请输入你要设置的密码:");
			psw = sc.nextInt();
			String blankSecond = sc.nextLine();
			System.out.println("请输入你的性别:");
			sex = sc.nextLine();
			System.out.println("您的卡号为" + newcardId);

			String sql = "Insert into BankDB (ID,CardID,Username,Sex,Password) values (" + id + "," + newcardId + ",'"
					+ name + "','" + sex + "'," + psw + ")";
			stmt.executeUpdate(sql);
			System.out.println("******您的信息已录入！******");
		} catch (Exception e) {
			System.out.println("******这里有一些错误哦~******");
			e.printStackTrace();
		} finally {
			if (rs != null)
				rs.close();
			if (stmt != null)
				stmt.close();
			if (conn != null)
				conn.close();
		}
	}

	public void SqlUserSave() throws SQLException {
		try {
			Class.forName("com.mysql.cj.jdbc.Driver");
			String url = "jdbc:mysql://localhost:3306/BankDB?useSSL=false&&serverTimezone=GMT%2B8";
			String admin = "root";
			String psw = "078772";
			conn = DriverManager.getConnection(url, admin, psw);
			stmt = conn.createStatement();

			String sql = "select * from BankDB CardID WHERE CardID = " + CardID + "";
			rs = stmt.executeQuery(sql);

			double balance = 0.00;
			double money = 0.00;
			while (rs.next()) {

				balance = rs.getDouble("Balance");
			}

			System.out.print("请输入您要存入的金额:");
			money = sc.nextDouble();

			if (money > 0) {
				balance = balance + money;
				String sqlChange = "update BankDB set Balance = " + balance + " WHERE CardID = " + CardID + " ";
				stmt.executeUpdate(sqlChange);
				System.out.println("******" + balance + "元已存入******");
			} else {
				System.out.println("****您的输入有误！****");
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (conn != null)
				conn.close();
			if (stmt != null)
				stmt.close();
			if (rs != null)
				rs.close();
		}
	}

	public void SqlUserWithdraw() throws SQLException {
		double money = 0.00;
		try {
			Class.forName("com.mysql.cj.jdbc.Driver");
			String url = "jdbc:mysql://localhost:3306/BankDB?useSSL=false&&serverTimezone=GMT%2B8";
			String admin = "root";
			String psw = "078772";
			conn = DriverManager.getConnection(url, admin, psw);
			stmt = conn.createStatement();

			String sql = "select * from BankDB CardID WHERE CardID = " + CardID + "";
			rs = stmt.executeQuery(sql);
			String name = null, password = null, sex = null;
			double balance = 0;
			while (rs.next()) {
				name = rs.getString("Username");
				password = rs.getString("Password");
				sex = rs.getString("Sex");
				balance = rs.getDouble("Balance");
			}

			System.out.println("****************************\n您的账户情况如下:");
			System.out.println("姓名：" + name);
			System.out.println("卡号：" + CardID);
			System.out.println("密码：" + password);
			System.out.println("性别：" + sex);
			System.out.println("余额：" + balance);
			System.out.println("***************************");

			System.out.print("请输入您要取出的金额:");
			money = sc.nextDouble();
			balance = balance - money;

			if (balance >= 0) {
				String sqlChange = "update BankDB set Balance = " + balance + " WHERE CardID = " + CardID + " ";
				stmt.executeUpdate(sqlChange);
				System.out.println("******" + balance + "元已取出******");
			} else {
				System.out.println("****您的账户里还没有这么多钱哦~努力挣钱吧~****");
			}

		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (conn != null)
				conn.close();
			if (stmt != null)
				stmt.close();
			if (rs != null)
				rs.close();
		}

	}

	public void SqlUserQuery() throws SQLException {

		try {
			Class.forName("com.mysql.cj.jdbc.Driver");
			String url = "jdbc:mysql://localhost:3306/BankDB?useSSL=false&&serverTimezone=GMT%2B8";
			String admin = "root";
			String psw = "078772";
			conn = DriverManager.getConnection(url, admin, psw);
			stmt = conn.createStatement();

			String sql = "select * from BankDB CardID WHERE CardID = " + CardID + "";
			rs = stmt.executeQuery(sql);
			String name = null, sex = null;
			double balance = 0;
			int password = 0;
			while (rs.next()) {
				name = rs.getString("Username");
				password = rs.getInt("Password");
				sex = rs.getString("Sex");
				balance = rs.getDouble("Balance");
			}
			System.out.println("****************************\n您的账户情况如下:");
			System.out.println("姓名：" + name);
			System.out.println("卡号：" + CardID);
			System.out.println("密码：" + password);
			System.out.println("性别：" + sex);
			System.out.println("余额：" + balance);
			System.out.println("***************************");

		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (conn != null)
				conn.close();
			if (stmt != null)
				stmt.close();
			if (rs != null)
				rs.close();
		}
	}

	public void SqlUserChangePsw() throws SQLException {
		try {
			Class.forName("com.mysql.cj.jdbc.Driver");
			String url = "jdbc:mysql://localhost:3306/BankDB?useSSL=false&&serverTimezone=GMT%2B8";
			String admin = "root";
			String psw = "078772";
			conn = DriverManager.getConnection(url, admin, psw);
			stmt = conn.createStatement();

			String sql = "select * from BankDB CardID WHERE CardID = " + CardID + "";
			rs = stmt.executeQuery(sql);
			String name = null, sex = null;
			int password = 0;
			while (rs.next()) {
				name = rs.getString("Username");
				password = rs.getInt("Password");
				sex = rs.getString("Sex");
			}
			System.out.println("****************************");
			while (true) {
				System.out.println("请重新输入您的密码:");
				int passwordtwice = sc.nextInt();

				if (passwordtwice == password) {

					System.out.println("***************************\n请输入您的新密码:");

					password = sc.nextInt();

					String sqlChange = "update BankDB set Password = " + password + " WHERE CardID = " + CardID + " ";
					stmt.executeUpdate(sqlChange);
					System.out.println("******尊敬的" + name + sex + "士您的密码已修改******");
					break;
				} else {
					System.out.println("有错误哦~请重新输入:");
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (conn != null)
				conn.close();
			if (stmt != null)
				stmt.close();
			if (rs != null)
				rs.close();
		}
	}
}

MYSQL类

package bank;

import java.io.RandomAccessFile;
import java.sql.*;
import java.util.Map;
import java.util.Scanner;


public class MySQL {
	Map<Integer, Users> users = BankDB.getDb().getUsers();
	public Users user;
	Object[] cardID = users.keySet().toArray();
	Scanner sc = new Scanner(System.in);
	
	Connection conn = null;
	Statement stmt = null;
	ResultSet rs = null;
	
	public void sqlStart() throws SQLException{

		try {
			Class.forName("com.mysql.cj.jdbc.Driver");
			String url = "jdbc:mysql://localhost:3306/BankDB?useSSL=false&&serverTimezone=GMT%2B8";
			String username = "root";
			String password = "078772";
			conn = DriverManager.getConnection(url,username,password);
			stmt = conn.createStatement();
		
		for (int i = 1;i<=users.size()-1;i++) {
			int cardId = Integer.parseInt(cardID[i].toString());
			user = BankDB.getDb().getUser(cardId);
			String sql = "Insert into BankDB (ID,CardID,Username,Sex,Password,Balance) values ("+i+","+cardID[i]+",'"+user.getName()+"','"+user.getSex()+"',"+user.getPassWord()+","+user.getBalance()+")";
			stmt.executeUpdate(sql);
		}
			//executeUpdate 增删改
			//查用executeQuery
		}catch(Exception e) {
			System.out.println("未能成功加载驱动程序，请检查是否导入驱动程序！");
			e.printStackTrace();
		}finally {
			if(rs!=null) rs.close();
			if(stmt!=null) stmt.close();
			if(conn!=null) conn.close();
		}
	}

	public void SqlAdminLogin() {
		System.out.println("查看全部成员的信息");
		//输入root账号密码查看全部信息
	}

	public void SqlAdminQuery() throws Exception {
		Connection conn = null;
		Statement stmt = null;
		ResultSet rs = null;
		try {
			Class.forName("com.mysql.cj.jdbc.Driver");
			String url = "jdbc:mysql://localhost:3306/BankDB?useSSL=false&&serverTimezone=GMT%2B8";
			System.out.print("我们要先获得权限\n请输入您的用户名:");// root
			String name = sc.nextLine();
			System.out.print("请输入您的密码:");// 078772
			String psw = sc.nextLine();
			if (name.equals("root") && psw.equals("root")) {
				conn = DriverManager.getConnection(url, name, psw);
				stmt = conn.createStatement();

				String sqlSingle = "select * from BankDB ";
				System.out.println("亲爱的管理员，感谢您的到来！\n以下是数据库内的全部信息：");
				rs = stmt.executeQuery(sqlSingle);
				System.out.println("id\t|username\t|sex\t|cardId\t|password\t|balance\t|");
				while (rs.next()) {
					int id = rs.getInt(1);
					int password = rs.getInt("Password");
					String username = rs.getString("Username");
					String sex = rs.getString("Sex");
					int cardId = rs.getInt("CardID");
					int balance = rs.getInt("Balance");
					System.out.println(id + "\t|" + username + "\t|" + sex + "\t|" + cardId + "\t|" + password + "\t|"
							+ balance + "\t|");
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			conn.close();
			stmt.close();
			rs.close();
		}
	}


	public void runOneTime() throws Exception{
		try {
		RandomAccessFile raf = new RandomAccessFile("D:/a电子书/java/time/time.txt","rw");
		int times = Integer.parseInt(raf.readLine());
		if (times == 1) {
			sqlStart();
			System.out.println("成员信息已载入！");
			raf.seek(0);
			times = times - 1;
			raf.write((times+"").getBytes());
			raf.close();
		}else {
			System.out.println("****成员信息早就载入啦！****");
			raf.close();
			}
		}catch(Exception e) {
			e.printStackTrace();
		}
	}

}

BankDB类

package bank;

import java.util.HashMap;
import java.util.Map;

public class BankDB {
	Map<Integer,Users> users = new HashMap<>();
	private BankDB() {
		Users u1 = new Users("Emiya","女",67400,123456,1000);
		Users u2 = new Users("Reese","男",67401,654321,13000);
		Users u3 = new Users("Finch","男",67402,654321,100000);
		Users u4 = new Users("Cheshire","女",67403,18554,5200);
		Users u5 = new Users("Carter","女",67404,111111,1000);
		Users u6 = new Users("Root","女",67405,222222,2000);
		Users u7 = new Users("Shane","女",67406,333333,2000);
		Users u8 = new Users("Sunshine","女",67407,444444,9000);
		Users u9 = new Users("Morrian","女",67409,121212,1212);

		users.put(67400, u1);
		users.put(67401, u2);
		users.put(67402, u3);
		users.put(67403, u4);
		users.put(67404, u5);
		users.put(67405, u6);
		users.put(67406, u7);
		users.put(67407, u8);
		users.put(67408, u9);
	}
	static private BankDB db = new BankDB();
	
	public static BankDB getDb() {

		return db;
	}
	public static void setDb(BankDB db) {
		BankDB.db = db;
	}

	public Map<Integer, Users> getUsers() {
		return users;
	}
	public void setUsers(Map<Integer, Users> users) {
		this.users = users;
	}
	
	public Users getUser(Integer cardId) {//由cardId获得用户对象
		Users user = users.get(cardId);
		return user;
	}
	
	
}

Users类

package bank;

public class Users {
	private String name;
	private String sex;
	private int passWord;
	private int cardId;
	private int balance;
	private int interestType;
	private int time;
	public Users() {}
	public Users(String name,String sex,int cardId,int passWord,int balance) {
		//super();或许不需要
		this.balance = balance;
		this.passWord = passWord;
		this.name = name;
		this.sex = sex;
		this.cardId = cardId;
	}
	
	public int getBalance() {
		return balance;
	}
	public void setBalance(int balance) {
		this.balance = balance;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getCardId() {
		return cardId;
	}
	public void setCardId(int cardId) {
		this.cardId = cardId;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public int getPassWord() {
		return passWord;
	}
	public void setPassWord(int passWord) {
		this.passWord = passWord;
	}
	public int getInterestType() {
		return interestType;
	}
	public void setInterestType(int interestType) {
		this.interestType = interestType;
	}
	public int getTime() {
		return time;
	}
	public void setTime(int time) {
		this.time = time;
	}
	

} 

*******************************************以下是纯HashMap**********************************************

 BankDb、Users类都一样就不贴了

test类

package bank;

public class test {
	public static void main(String[] args) {
		operate o = new operate();
		o.login();
		o.menuSelect();
	}
}

operate类

package bank;

import java.util.*;

public class operate {
	Map<Integer, Users> users = BankDB.getDb().getUsers();
	Scanner sc = new Scanner(System.in);
	public Users user;

	public void login() {
		System.out.println("欢迎来到银行服务系统");
		while (true) {
			System.out.print("输入卡号:");
			int cardId = sc.nextInt();
			System.out.print("输入密码:");
			int passWord = sc.nextInt();
			user = BankDB.getDb().getUser(cardId);
			if (users.containsKey(cardId) && user.getPassWord() == passWord) {// equals是字符串
				System.out.println("欢迎" + user.getName() + user.getSex() + "士!");
				break;
			} else {
				System.out.println("或许你输入了什么奇怪的东西哦~");
			}
		}
	}// login

	public void menuSelect() {
		while (true) {
			System.out.println("1.查詢\n2.存款\n3.取款\n請輸入你的選擇:");
			int choice = sc.nextInt();
			switch (choice) {
			case 0: {
				System.out.println("真的要退出嗎？那就好好道個別吧bye~\n===============The end===============");
				return;
				}
			case 1: {
				query();
				break;
				}
			case 2:{
				saveMoney();
				break;
				}
			case 3:{
				withdrawMoney();
				break;
				}
			default:{
				System.out.println("您的輸入有問題哦~");
				break;
				}
			}
		}
	}

	public void query() {
		System.out.println("您當前的餘額:" + user.getBalance() + "元\n" + "特殊時期請保管好自己的口袋!");
	}

	public void saveMoney() {
		while (true) {
			System.out.print("想要存入多少钱呐~悄悄告诉我哦:");
			int num = sc.nextInt();

			if (num <= 0) {
				System.out.println("请检查你的输入~");
			} else {
				
				user.setBalance(num + user.getBalance());
				System.out.println("成功存入" + num + "元\n" + "目前余额为:" + user.getBalance());
			}
		}
	}

	public void withdrawMoney() {
		System.out.println("怎么，这么早就想把你的钱要回去了吗？说吧，想要多少？：");
		int num = sc.nextInt();
		if (num > user.getBalance()) {
			System.out.println("你可要挣更多钱哦~目前没有这么多钱躺在你的钱包里哦~");
		} else {
			user.setBalance(user.getBalance() - num);
			System.out.println("成功取出" + num + "元\n" + "目前余额为:" + user.getBalance());
		}
	}
}

就只是留个纪念啦~有一个比较好一些的类似的是小组作业，但毕竟不是我个人所有啦~

反正还有很多要进步的地方，加油！

标签：String,rs,System,Navicat,println,HashMap,public,Bank,out
来源： https://blog.csdn.net/m0_56895688/article/details/122018193

本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享；
2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关；
3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关；
4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除；
5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。