java登入的代码

java ATM登陆循环代码?

下面是一个简单的登录示例：

代码复制展示：

public class ATMLogin {

public static void main(String[] args) {

// 设置用户名和密码

String username = "gqk";

// 读取用户输入的用户名和密码

Scanner in = new Scanner(System.in);

System.out.print("请输入用户名：");

String inputUsername = in.nextLine();

System.out.print("请输入密码：");

String inputPassword = in.nextLine();

// 检查用户名和密码是否正确

if (inputUsername.equals(username) inputPassword.equals(password)) {

System.out.println("欢迎" ◆ username ◆ "登录！");

break; // 登录成功,退出循环

} else {

System.out.println("用户名或密码错误,请重新输入！");

}

System.out.println("卡片已经被锁,请联系客服人员！");

回答不易望请采纳

Java如何登录token的代码是什么?

首先是Token主类.类很简单

package com.company.util;

import java.util.ArrayList;

import javax.servlet.http.HttpSession;

public class Token {

private static final String TOKEN_LIST_NAME = "tokenList";

public static final String TOKEN_STRING_NAME = "token";

private static ArrayList getTokenList(HttpSession session) {

Object obj = session.getAttribute(TOKEN_LIST_NAME);

if (obj != null) {

return (ArrayList) obj;

ArrayList tokenList = new ArrayList();

session.setAttribute(TOKEN_LIST_NAME, tokenList);

return tokenList;

private static void saveTokenString(String tokenStr, HttpSession session) {

ArrayList tokenList = getTokenList(session);

tokenList.add(tokenStr);

private static String generateTokenString(){

return new Long(System.currentTimeMillis()).toString();

/** *//**

* Generate a token string, and save the string in session, then return the token string.

*

* @param HttpSession

* session

* @return a token string used for enforcing a single request for a particular transaction.

*/

public static String getTokenString(HttpSession session) {

String tokenStr = generateTokenString();

saveTokenString(tokenStr, session);

return tokenStr;

* check whether token string is valid. if session contains the token string, return true.

* otherwise, return false.

* @param String

* tokenStr

* @return true: session contains tokenStr; false: session is null or tokenStr is id not in session

public static boolean isTokenStringValid(String tokenStr, HttpSession session) {

boolean valid = false;

if(session != null){

if (tokenList.contains(tokenStr)) {

valid = true;

tokenList.remove(tokenStr);

return valid;

在jsp页面端.

首先import该类：

%@ page import="com.company.util.Token" %

表单包含隐藏的token字符串:

form

input type="hidden" name="%=Token.TOKEN_STRING_NAME %" value="%=Token.getTokenString(session) %"

/form

在Servlet中添加如下代码.

if(Token.isTokenStringValid(request.getParameter(Token.TOKEN_STRING_NAME), request.getSession())){

//进行正常业务流程

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;

private static final long serialVersionUID = 1L;

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

private JComboBoxString jcb;

private ButtonGroup btg;

this.setTitle("注册账户");

this.setLocationRelativeTo(null);

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

init();

this.setVisible(true);

private void init() {

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();

this.add(jp1);

private void addFun1() {

jp1=new JPanel();

jp1.add(labelId);

btg=new ButtonGroup();

jr1=new JRadioButton("定期");

btg.add(jr1);

登陆界面的java代码怎么写?

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

import java.sql.*;

class LoginFrm extends JFrame implements ActionListener

{

JLabel lbl1=new JLabel("用户名");

JPasswordField pf=new JPasswordField();

JButton btn1=new JButton("确定");

public LoginFrm()

this.setTitle("登陆");

JPanel jp=(JPanel)this.getContentPane();

jp.add(lbl1);jp.add(txt);

btn1.addActionListener(this);

public void actionPerformed(ActionEvent ae)

if(ae.getSource()==btn1)

try

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver")；

Connection con=DriverManager.getConnection("jdbc:odbc:MyDB","","");

Statement cmd=con.createStatement();

ResultSet rs=cmd.executeQuery("select * from loginAndpassword where login='"◆txt.getText()◆"' and password='"◆pf.getText()◆"'");

if(rs.next())

JOptionPane.showMessageDialog(null,"登陆成功！");

else

JOptionPane.showMessageDialog(null,"用户名或密码错误！");

} catch(Exception ex){}

txt.setText("");

pf.setText("");

public static void main(String arg[])

JFrame.setDefaultLookAndFeelDecorated(true);

LoginFrm frm=new LoginFrm();

frm.setVisible(true);

用java写一个登录界面的代码,哪位大神会啊,谢谢.

import?java.awt.Dimension;

import?java.awt.Toolkit;

import?java.awt.event.ActionEvent;

import?java.awt.event.ActionListener;

import?javax.swing.JButton;

import?javax.swing.JFrame;

import?javax.swing.JLabel;

import?javax.swing.JOptionPane;

import?javax.swing.JPasswordField;

import?javax.swing.JTextField;

public?static?void?main(String[]?args)?{

final?String?userName?=?"abc";

JFrame?jFrame?=?new?JFrame("登陆界面");

Dimension?dimension?=?Toolkit.getDefaultToolkit().getScreenSize();

jFrame.setResizable(false);

jFrame.setLayout(null);

jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JLabel?label1?=?new?JLabel("姓名");

jFrame.add(label1);

final?JTextField?text1?=?new?JTextField();

jFrame.add(text1);

JButton?button?=?new?JButton("Login");

button.addActionListener(new?ActionListener()?{

@Override

public?void?actionPerformed(ActionEvent?e)?{

JOptionPane.showMessageDialog(null,?"登陆成功误",?"提示",?JOptionPane.INFORMATION_MESSAGE);

}?else?{

JOptionPane.showMessageDialog(null,?"错误",?"提示",?JOptionPane.ERROR_MESSAGE);

text1.setText("");

});

jFrame.add(button);

jFrame.setVisible(true);

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