逻辑与功能图

实现逻辑

程序共有三个文件
Bankmangement.java:包括程序运行的主函数，方法等
User.java：实体类，用于创建对象
JDBCUtils：对数据库方法进行封装

功能图

1.User实体类

数据库共有三张表，分别是admin管理员帐号，user用户账号，record用户记录。
2.Bankmangement功能图

代码

Bankmangement

package bank;
import java.sql.*;
import java.text.SimpleDateFormat;
import java.util.*;
public class Bankmanagement {                   //知识点2：类的声明private static Scanner sc = new Scanner(System.in);         //知识点3:类成员的访问控制（私有，只能被这个类本身访问）public static void main(String[] args) {menu();}public static void menu(){System.out.println("-------------------欢迎进入银行储蓄系统----------------");System.out.println("-------------------请选择您的登录方式------------------");System.out.println("-------------------0、登陆管理员账户-----------------");System.out.println("-------------------1、登录用户账户-----------------");System.out.println("-------------------2、注册账户-----------------");String select = sc.next();switch (select) {case "0"://登录login();      //知识点8：调用方法break;case "1"://登录login1();      //知识点8：调用方法break;case "2"://注册：将注册操作定义到一个方法中然后调用方法register();break;}}//注册账户public static void register() {System.out.println("--------------欢迎进入注册页面-----------");Random r = new Random();System.out.println("请输入账户名：");String username = sc.next();System.out.println("请输入账户密码");String password = sc.next();System.out.println("请输入手机号：");String phonenumber = sc.next();System.out.println("请输入地址：");String address = sc.next();System.out.println("请输入账户余额：");float balance = sc.nextFloat();boolean flag = new Bankmanagement().adminlogin(username,password);while (!flag){int id = r.nextInt(100000,999999);Connection conn = null;Statement stmt = null;PreparedStatement pstmt = null;try{conn = JDBCUtils.getConnection();//定义sql语句String sql = "insert into user(username,id,password,phonenumber,address,balance) values(?,?,?,?,?,?)";pstmt = conn.prepareStatement(sql);pstmt.setString(1,username);pstmt.setInt(2,id);pstmt.setString(3,password);pstmt.setString(4,phonenumber);pstmt.setString(5,address);pstmt.setDouble(6,balance);//判断int count = pstmt.executeUpdate();if (count>0){System.out.println("注册成功");System.out.println("您的id账号为:"+id);menu();}else{System.out.println("注册失败");return;}}catch (SQLException e){e.printStackTrace();}finally {JDBCUtils.close(pstmt,conn);}}System.out.println("账户已存在请重新输入！");}public boolean judgement(String username){if (username == null){return false;}//数据库连接Connection conn = null;PreparedStatement pstmt = null;ResultSet rs = null;try{conn = JDBCUtils.getConnection();//定义sql语句String sql = "select * from user where username = ?";//获取执行对象pstmt = conn.prepareStatement(sql);//给问号赋值pstmt.setString(1,username);//执行查询rs = pstmt.executeQuery();//判断return rs.next();}catch (SQLException e){e.printStackTrace();}finally {JDBCUtils.close(rs,pstmt,conn);}return false;}//登录管理员账户public static void login(){System.out.println("--------欢迎进入登录页面--------");for (int i = 1; i <= 3; i++) {System.out.println("请输入管理员账号");String username = sc.next();System.out.println("请输入管理员密码");String password = sc.next();boolean flag = new Bankmanagement().adminlogin(username,password);while (flag) {            //知识点12：while语句System.out.println("请录入您要进行的操作");System.out.println("1、添加账户");System.out.println("2、所有账户个人信息的查询");System.out.println("3、删除账户");System.out.println("4、退出系统");String num = sc.next();switch (num) {           //知识点13：switch选择语句case "1":Add();break;case "2":checkAllUsers();break;case "3"://注册：将注册操作定义到一个方法中然后调用方法Delete();break;case "4":menu();break;}}System.out.println("登录失败,用户名或密码错误");}System.out.println("您的3次机会已经用完，自动退出系统");System.exit(0);}public boolean adminlogin(String username,String password){if (username == null||password == null){System.out.println("!!!!");return false;}//数据库连接Connection conn = null;PreparedStatement pstmt = null;ResultSet rs = null;try{conn = JDBCUtils.getConnection();//定义sql语句String sql = "select * from admin where username = ? and password = ?";//获取执行对象pstmt = conn.prepareStatement(sql);//给问号赋值pstmt.setString(1,username);pstmt.setString(2,password);//执行查询rs = pstmt.executeQuery();//判断return rs.next();}catch (SQLException e){e.printStackTrace();}finally {JDBCUtils.close(rs,pstmt,conn);}return false;}//登录账户public static void login1(){System.out.println("--------欢迎进入登录页面--------");for (int i = 1; i <= 3; i++) {System.out.println("请录入您要登录的用户名");String username = sc.next();System.out.println("请录入您的id");int id = sc.nextInt();System.out.println("请录入您要登录的密码");String password = sc.next();boolean flag = new Bankmanagement().userlogin(username,password,id);while (flag) {            //知识点12：while语句User u = new User(username,id,password);System.out.println("请录入您要进行的操作");System.out.println("1、修改账户");System.out.println("2、用户密码的修改");System.out.println("3、当前账户个人信息的查询");System.out.println("4、存钱");System.out.println("5、取钱");System.out.println("6、转账");System.out.println("7、打印清单");System.out.println("8、注销账户");System.out.println("9、退出系统");String num2 = sc.next();switch (num2) {           //知识点13：switch选择语句case "1":updateMsg(u);break;case "2":updatePwd(u);break;case "3":updateOne (u);break;case "4":saveMoney(u);break;case "5":drawMoney(u);break;case "6":transferMoney(u);break;case "7":print(u);break;case "8":cancel(u);break;case "9":menu();break;}}System.out.println("登录失败");}System.out.println("您的3次机会已经用完，自动退出系统");System.exit(0);}public boolean userlogin(String username,String password,int id){if (username == null||password == null||id ==0){System.out.println("!!!!");return false;}//数据库连接Connection conn = null;Statement stmt = null;ResultSet rs = null;try{conn = JDBCUtils.getConnection();//定义sql语句String sql = "select * from user where username = '"+username+"'and id = '"+id+"' and password = '"+password+"'";//获取执行对象stmt = conn.createStatement();//执行查询rs = stmt.executeQuery(sql);//判断return rs.next();}catch (SQLException e){e.printStackTrace();}finally {JDBCUtils.close(rs,stmt,conn);}return false;}//修改用户信息public static void updateMsg(bank.User u) {                //知识点：声明一个方法System.out.println("----------欢迎进入修改账户信息模块----------");Connection conn = null;PreparedStatement pstmt = null;try{System.out.println("请录入您要修改的手机号：");String phonenumber = sc.next();System.out.println("请录入您要修改的地址：");String address = sc.next();System.out.println("请录入您要修改的余额：");float balance = Float.parseFloat(sc.next());conn = JDBCUtils.getConnection();//定义sql语句String sql="update user set phonenumber=?,address=?,balance=? where username=?";pstmt = conn.prepareStatement(sql);pstmt.setString(1,phonenumber);pstmt.setString(2,address);pstmt.setDouble(3,balance);pstmt.setString(4,u.getName());//            pstmt.executeUpdate();//获取执行对象
//            stmt = conn.createStatement();//执行查询
//            rs = stmt.executeQuery(sql);//判断int count = pstmt.executeUpdate();if (count>0){System.out.println("修改成功");}else{System.out.println("修改失败");}}catch (SQLException e){e.printStackTrace();}finally {JDBCUtils.close(pstmt,conn);}}//删除账户public static void Delete(){System.out.println("----------欢迎进入用户信息删除模块----------");System.out.println("请录入您要删除的用户名");String username = sc.next();boolean flag = new Bankmanagement().judge(username);while (flag){Connection conn = null;Statement stmt = null;PreparedStatement pstmt = null;try{conn = JDBCUtils.getConnection();//定义sql语句String sql = "delete from user where username=?";pstmt = conn.prepareStatement(sql);pstmt.setString(1,username);
//            pstmt.executeUpdate();//获取执行对象
//            stmt = conn.createStatement();//执行查询
//            rs = stmt.executeQuery(sql);//判断int count =pstmt.executeUpdate();if (count>0){System.out.println("删除成功");return;}else{System.out.println("删除失败,请重试！");Delete();}}catch (SQLException e){e.printStackTrace();}finally {JDBCUtils.close(pstmt,conn);}}System.out.println("你输入的账号不存在，请重新输入！");Delete();}//添加用户public static void Add(){System.out.println("请输入增加的账户名：");String username = sc.next();System.out.println("请输入账户密码");String password = sc.next();System.out.println("请输入手机号：");String phonenumber = sc.next();System.out.println("请输入地址：");String address = sc.next();System.out.println("请输入账户余额：");float balance = sc.nextFloat();Random r = new Random();
//        bank.User user2 = new bank.User(username , number, password,  address, balance);    //知识点：构造方法
//        userlist.add(user2);   //知识点19：调用集合添加方法
//
//        System.out.println("该用户添加成功！！");
//        return;int id = r.nextInt(100000,999999);Connection conn = null;Statement stmt = null;PreparedStatement pstmt = null;try{conn = JDBCUtils.getConnection();//定义sql语句String sql = "insert into user(username,id,password,phonenumber,address,balance) values(?,?,?,?,?,?)";pstmt = conn.prepareStatement(sql);pstmt.setString(1,username);pstmt.setInt(2,id);pstmt.setString(3,password);pstmt.setString(4,phonenumber);pstmt.setString(5,address);pstmt.setDouble(6,balance);
//            pstmt.executeUpdate();//获取执行对象
//            stmt = conn.createStatement();//执行查询
//            rs = stmt.executeQuery(sql);//判断int count = pstmt.executeUpdate();if (count>0){System.out.println("添加成功");System.out.println("id账号为:"+id);}else{System.out.println("添加失败");}}catch (SQLException e){e.printStackTrace();}finally {JDBCUtils.close(pstmt,conn);}}//修改密码public static void updatePwd(bank.User u) {System.out.println("请录入您的原密码：");String oldPwd = sc.next();boolean flag = new Bankmanagement().userlogin(u.getName(),oldPwd, u.getId());while (flag) {          //知识点20：equals方法System.out.println("您的原密码输入正确，请录入您要修改的新密码：");String newPwd = sc.next();Connection conn = null;PreparedStatement pstmt = null;try{conn = JDBCUtils.getConnection();//定义sql语句String sql="update user set password=? where username=?";pstmt = conn.prepareStatement(sql);pstmt.setString(1,newPwd);pstmt.setString(2,u.getName());//            pstmt.executeUpdate();//获取执行对象
//            stmt = conn.createStatement();//执行查询
//            rs = stmt.executeQuery(sql);//判断int count = pstmt.executeUpdate();if (count>0){System.out.println("修改成功");login1();}else{System.out.println("修改失败");return;}}catch (SQLException e){e.printStackTrace();}finally {JDBCUtils.close(pstmt,conn);}}System.out.println("您的原密码输入错误，密码修改失败");}//当前账户个人信息查询public static void updateOne (bank.User u){//        System.out.println("查询信息如下：");
//        System.out.println("用户名       手机号        密码          住址         余额");
//        System.out.println(u.getName() + "        " + u.getNumber() + "        " + u.getPassword() + "        " + u.getAddress()+ "        " + u.getBalance());Connection conn = null;PreparedStatement pstmt = null;ResultSet rs = null;//        User user = null;try{conn = JDBCUtils.getConnection();//定义sql语句String sql = "select * from user where id = '"+u.getId()+"'";
//            pstmt.setInt(1,u.getId());//获取执行对象pstmt = conn.prepareStatement(sql);//执行查询rs = pstmt.executeQuery();while(rs.next()) {//获取数据String name = rs.getString("username");int id = rs.getInt("id");String number = rs.getString("phonenumber");String password = rs.getString("password");String address = rs.getString("address");double balance = rs.getDouble("balance");System.out.println("用户名       id      手机号        密码          住址         余额");System.out.println(name + "        " + id + "        " + number + "        " + password + "        " + address + "        " + balance);}}catch (SQLException e){e.printStackTrace();}finally {JDBCUtils.close(rs,pstmt,conn);}}//所有用户个人信息查询public static void checkAllUsers() {ArrayList<User> list = new Bankmanagement().findall();System.out.println("用户名        手机号          密码           住址          余额");for (bank.User u : list) {       //知识点21：遍历System.out.println(u.getName() + "      " + u.getNumber() + "        " + u.getPassword() + "       " + u.getAddress()+ "        " +u.getBalance());}}public ArrayList<User> findall(){//数据库连接Connection conn = null;PreparedStatement pstmt = null;ResultSet rs = null;ArrayList<User> list = null;try{conn = JDBCUtils.getConnection();//定义sql语句String sql = "select * from user";//获取执行对象pstmt = conn.prepareStatement(sql);//执行查询rs = pstmt.executeQuery();User user = null;list = new ArrayList<User>();//便利while(rs.next()){//获取数据String name = rs.getString("username");int id = rs.getInt("id");String number = rs.getString("phonenumber");String address = rs.getString("address");double balance = rs.getDouble("balance");//创建User对象user = new User();user.setName(name);user.setId(id);user.setNumber(number);user.setAddress(address);user.setBalance((float) balance);//装载集合list.add(user);}}catch (SQLException e){e.printStackTrace();}finally {JDBCUtils.close(rs,pstmt,conn);}return list;}//存钱public static void saveMoney(bank.User u){u.setOperate("存钱");System.out.println("请输入您要存入的金额：");float a = sc.nextFloat();u.setBalance2(a);Calendar calendar = Calendar.getInstance();    //知识点23：获取时间SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");    //知识点24：更改格式u.setTime(formatter.format(calendar.getTime()));Connection conn = null;PreparedStatement pstmt1 = null;try{//获取连接conn = JDBCUtils.getConnection();//定义sqlString sql1 = "update user set balance = balance + ? where username = ?";//-pstmt1 = conn.prepareStatement(sql1);//+pstmt1.setDouble(1,a);pstmt1.setString(2,u.getName());pstmt1.executeUpdate();r_operate(u);}catch (SQLException e){e.printStackTrace();}finally {JDBCUtils.close(pstmt1,conn);}System.out.println("存钱成功");}//取钱public static void drawMoney(bank.User u){u.setOperate("取钱");System.out.println("请输入您要取的金额：");float a = sc.nextFloat();u.setBalance2(a);Calendar calendar = Calendar.getInstance();    //知识点23：获取时间SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");    //知识点24：更改格式u.setTime(formatter.format(calendar.getTime()));Connection conn = null;PreparedStatement pstmt1 = null;try{//获取连接conn = JDBCUtils.getConnection();//定义sqlString sql1 = "update user set balance = balance - ? where username = ?";//-pstmt1 = conn.prepareStatement(sql1);//+pstmt1.setDouble(1,a);pstmt1.setString(2,u.getName());pstmt1.executeUpdate();r_operate(u);}catch (SQLException e){e.printStackTrace();}finally {JDBCUtils.close(pstmt1,conn);}System.out.println("取钱成功");}//转账public static void transferMoney(bank.User u){u.setOperate("转账");Calendar calendar = Calendar.getInstance();    //知识点23：获取时间SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");    //知识点24：更改格式u.setTime(formatter.format(calendar.getTime()));float money;System.out.println("请输入您要转账的对方账号：");String c = sc.next();System.out.println("请输入您要转账的金额：");float d = sc.nextFloat();u.setBalance2(d);boolean flag = new Bankmanagement().judge(c);if (flag){Connection conn = null;PreparedStatement pstmt1 = null;PreparedStatement pstmt2 = null;try{//获取连接conn = JDBCUtils.getConnection();//定义sqlString sql1 = "update user set balance = balance - ? where username = ?";String sql2 = "update user set balance = balance + ? where username = ?";//-pstmt1 = conn.prepareStatement(sql1);//+pstmt2 = conn.prepareStatement(sql2);pstmt1.setDouble(1,d);pstmt1.setString(2,u.getName());pstmt2.setDouble(1,d);pstmt2.setString(2,c);pstmt1.executeUpdate();pstmt2.executeUpdate();}catch (SQLException e){e.printStackTrace();}finally {JDBCUtils.close(pstmt1,conn);JDBCUtils.close(pstmt2,null);}System.out.println("转账成功");r_operate(u);return;}else {System.out.println("您输入的帐号不存在请重新输入!");transferMoney(u);}}public static void r_operate(bank.User u){Connection conn = null;Statement stmt = null;PreparedStatement pstmt = null;try{conn = JDBCUtils.getConnection();//定义sql语句String sql = "insert into record(time,id,username,operate,balance2) values(?,?,?,?,?)";pstmt = conn.prepareStatement(sql);pstmt.setString(1, u.getTime());pstmt.setInt(2,u.getId());pstmt.setString(3,u.getName());pstmt.setString(4,u.getOperate());pstmt.setDouble(5,u.getBalance2());
//            pstmt.executeUpdate();//获取执行对象
//            stmt = conn.createStatement();//执行查询
//            rs = stmt.executeQuery(sql);//判断pstmt.executeUpdate();}catch (SQLException e){e.printStackTrace();}finally {JDBCUtils.close(pstmt,conn);}}public boolean judge(String username){if (username == null){return false;}//数据库连接Connection conn = null;PreparedStatement pstmt = null;ResultSet rs = null;try{conn = JDBCUtils.getConnection();//定义sql语句String sql = "select * from user where username = ?";//获取执行对象pstmt = conn.prepareStatement(sql);//给问号赋值pstmt.setString(1,username);//执行查询rs = pstmt.executeQuery();//判断return rs.next();}catch (SQLException e){e.printStackTrace();}finally {JDBCUtils.close(rs,pstmt,conn);}return false;}//打印清单public static void print(bank.User u){ArrayList<User> list = new Bankmanagement().findalluser(u);System.out.println("信息如下：");System.out.println("时间          id            用户名               操作               操作金额");//知识点21：遍历for (bank.User m : list) {System.out.println(m.getTime() + "       " +m.getId() + "          " +m.getName()+"              " +m.getOperate() + "               " + m.getBalance2());}}public ArrayList<User> findalluser(bank.User u){//数据库连接Connection conn = null;PreparedStatement pstmt = null;ResultSet rs = null;ArrayList<User> list = null;try{conn = JDBCUtils.getConnection();//定义sql语句String sql = "select * from record where id = '"+u.getId()+"'";//获取执行对象pstmt = conn.prepareStatement(sql);//执行查询rs = pstmt.executeQuery();User user = null;list = new ArrayList<User>();//便利while(rs.next()){//获取数据String time = String.valueOf(rs.getTime("time"));int id = rs.getInt("id");String name = rs.getString("username");String operate = rs.getString("operate");double balance2 = rs.getDouble("balance2");//创建User对象user = new User();user.setTime(time);user.setId(id);user.setName(name);user.setOperate(operate);user.setBalance2((float) balance2);//装载集合list.add(user);}}catch (SQLException e){e.printStackTrace();}finally {JDBCUtils.close(rs,pstmt,conn);}return list;}//存钱//注销账户public static void cancel(bank.User u){System.out.println("您是否要注销:  Y/N");String a = sc.next();//知识点：构造方法switch(a){case "Y":Connection conn = null;Statement stmt = null;PreparedStatement pstmt = null;try{conn = JDBCUtils.getConnection();//定义sql语句String sql = "delete from user where username = ?";pstmt = conn.prepareStatement(sql);pstmt.setString(1,u.getName());//判断int count =pstmt.executeUpdate();if (count>0){System.out.println("注销成功");menu();}else{System.out.println("注销失败,请重试！");return;}}catch (SQLException e){e.printStackTrace();}finally {JDBCUtils.close(pstmt,conn);}
//                }break;case "N":break;}}
}

User

package bank;public class User {public String getName() {return name;}public void setName(String name) {this.name = name;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getNumber() {return number;}public void setNumber(String number) {this.number = number;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}public float getBalance() {return balance;}public void setBalance(float balance) {this.balance = balance;}public String getOperate() {return operate;}public void setOperate(String operate) {this.operate = operate;}public float getBalance2() {return balance2;}public void setBalance2(float balance2) {this.balance2 = balance2;}public String getTime() {return time;}public void setTime(String time) {this.time = time;}public User(String name, String password) {this.name = name;this.password = password;}public User(String name, int id, String password) {this.name = name;this.id = id;this.password = password;}public User() {}public User(String name, int id, String number, String address, float balance) {this.name = name;this.id = id;this.number = number;this.address = address;this.balance = balance;}private String name;     //知识点26:声明变量private int id;private String number;private String password;private String address;private float balance;private String operate;private String time;@Overridepublic String toString() {return "User{" +"name='" + name + '\'' +", id=" + id +", number='" + number + '\'' +", password='" + password + '\'' +", address='" + address + '\'' +", balance=" + balance +", operate='" + operate + '\'' +", balance2=" + balance2 +", time='" + time + '\'' +'}';}private float balance2;public User(String name, int id, String number, String password, String address, float balance, String operate, float balance2, String time) {this.name = name;this.id = id;this.number = number;this.password = password;this.address = address;this.balance = balance;this.operate = operate;this.balance2 = balance2;this.time = time;}public User(String name, int id, float balance, String operate, float balance2, String time) {this.name = name;this.id = id;this.balance = balance;this.operate = operate;this.balance2 = balance2;this.time = time;}}

JDBCUtils

package bank;
import javax.lang.model.element.NestingKind;
import java.io.FileReader;
import java.io.IOException;
import java.net.URL;
import java.sql.*;
import java.util.Properties;/*** 文件的读取，只需要读取一次即可拿到这些值** **/
public class JDBCUtils {//    private  static String url;
//    private static String user;
//    private static String password;
//    private static String driver;static {//读取文件资源try {//            //1.创建Properties集合类
//            Properties pro = new Properties();
//            //获取src路径下的文件方式-->ClassLoader
//            ClassLoader classLoader = JDBCUtils.class.getClassLoader();
//            URL res = classLoader.getResource("jdbc.properties");
//            String path = res.getPath();
//            System.out.println(path);
//            //2.加载文件
//            pro.load(new FileReader(path));
//            //3.获取数据，赋值
//            url = pro.getProperty("url");
//            user = pro.getProperty("user");
//            password = pro.getProperty("password");
//            driver = pro.getProperty("driver");//4.注册驱动Class.forName("com.mysql.cj.jdbc.Driver");} catch (ClassNotFoundException e) {throw new RuntimeException(e);}}public static Connection getConnection() throws SQLException {return DriverManager.getConnection("jdbc:mysql://localhost:3306/bank","root","gqdqcc21");}public static void close(ResultSet rs,Statement stmt, Connection conn){if (rs !=null){try{rs.close();}catch (SQLException e){e.printStackTrace();}}if (stmt !=null){try{stmt.close();}catch (SQLException e){e.printStackTrace();}}if (conn !=null){try{conn.close();}catch (SQLException e){e.printStackTrace();}}}public static void close(Statement stmt, Connection conn){if (stmt !=null){try{stmt.close();}catch (SQLException e){e.printStackTrace();}}if (conn !=null){try{conn.close();}catch (SQLException e){e.printStackTrace();}}}
}

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java 银行管理系统（连接数据库Mysql）

java 银行管理系统（连接数据库Mysql）

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