java账号密码的代码 java账号密码的代码是什么

JAVA编写保存用户名和密码程序代码

这个需要你会file的操作，将接收的username和password写入user.Txt文件中即可。

相关问答

Q1: 用JAVA编写输入用户名和密码

import java.util.Scanner;

public class Logon {

private static final char username = '青';

private static final int password = 123;

private static final Scanner san = new Scanner(System.in);

public static void main(String[] args) {

char iname;

int ipass;

System.out.print("请输入用户名: ");

iname = san.next().charAt(0);

System.out.print("请输入密码: ");

ipass = san.nextInt();

if(Logon.username == iname Logon.password == ipass) {

System.out.println("欢迎你, " + Logon.username);

} else {

System.out.println("对不起, 你不是" + Logon.username);

}

}

}

Q2: 用JAVA代码实现登录名字与密码

1.写一个操作数据库的通用DAO（假设为Dao.java）,提供

·加载数据库驱动和获取数据库连接的方法：void getConnection();

·执行查询的方法：ResultSet executeQuery(String sql);

·执行更新的方法：Integer executeUpdate(String sql);

·关闭资源的方法：void releaseResource(Connection con);

2.在你的界面中把用户名和密码取出来

·username = yourTextField.getText();

·password = yourPasswordField.getText();

3.匹配

·验证username、password是否是有效输入值（例如：不能包含特殊字符，不能有注入嫌疑等）

·String sql = "select * from yourTable where username='"+username+"' and password='"+password+"'" ;

·Dao.executeQuery(sql):如果有结果说明合法，否则不合法。

不懂Connect 我

Q3: java怎么写代码才能保存从键盘输入的用户名和密码

cmd的话需要用scanner接受键盘输入

Scanner input = new Scanner(System.in);

System.out.println("请输入用户名：");

String username = input.next();

System.out.println("请输入密码：");

String password = input.next();

try {

FileWriter fw = new FileWriter("d:/text.txt", false);

BufferedWriter writer = new BufferedWriter(fw);

StringBuffer sb = new StringBuffer();

sb.append("用户名：").append(username).append(" ").append("密码：")

.append(password);

writer.write(sb.toString());

writer.close();

fw.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

Q4: 求JAVA实现用户登录界面代码？

你要先学会截图哦,你发的看不清楚,重新写了一个你参考参考!

import java.awt.GridLayout;

import javax.swing.ButtonGroup;

import javax.swing.JButton;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JRadioButton;

import javax.swing.JTextField;

public class Day30A extends JFrame {

private static final long serialVersionUID = 1L;

private JLabel labelName,labelId,labelPass,labelMoney,labelSelect,labelCar;

private JComboBoxString jcb;

private JPanel jp1,jp2,jp3,jp4,jp5,jp6,jp7;

private ButtonGroup btg;

private JRadioButton jr1,jr2;

Day30A(){

this.setTitle("注册账户");

this.setLayout(new GridLayout(7,1));

this.setSize(300,280);

this.setLocationRelativeTo(null);

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

init();

this.setVisible(true);

}

private void init() {

String str="卡片类型1,卡片类型2,卡片类型3,卡片类型4,卡片类型5";

jcb=new JComboBox(str.split(","));

labelId=new JLabel("账号: ");

labelName=new JLabel("姓名: ");

labelPass=new JLabel("密码: ");

labelMoney=new JLabel("开户金额:");

labelSelect=new JLabel("存款类型:");

labelCar=new JLabel("卡片类型:");

addFun1();

addFun2();

}

private void addFun2() {

this.add(jp1);

this.add(jp2);

this.add(jp3);

this.add(jp4);

this.add(jp5);

this.add(jp6);

this.add(jp7);

}

private void addFun1() {

jp1=new JPanel();

jp1.add(labelId);

jp1.add(new JTextField(15));

jp2=new JPanel();

jp2.add(labelName);

jp2.add(new JTextField(15));

jp3=new JPanel();

jp3.add(labelPass);

jp3.add(new JTextField(15));

jp4=new JPanel();

jp4.add(labelMoney);

jp4.add(new JTextField(13));

jp5=new JPanel();

jp5.add(labelSelect);

btg=new ButtonGroup();

jr1=new JRadioButton("定期");

jr2=new JRadioButton("活期",true);

btg.add(jr1);

btg.add(jr2);

jp5.add(jr1);

jp5.add(jr2);

jp6=new JPanel();

jp6.add(labelCar);

jp6.add(jcb);

jp7=new JPanel();

jp7.add(new JButton("确定"));

jp7.add(new JButton("取消"));

}

public static void main(String[] args) {

new Day30A();

}

}