登录注册后台代码java 登录注册系统代码

java编写一个登陆和注册信息的源代码,最简单的就可以,不需要数据库的那种

你这个不用数据库真的是有点难搞

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我写了个用集合存储的，你看看，能否帮上你

java.util.ListString list = new ArrayListString();

list.add("qq=123");//存储的时候用（用户名=密码）的形式

list.add("ww=456");

String username = "qq";

String password = "123";

for (int i = 0; i  list.size(); i++) {

String num = username +"="+password;

if(num.equals(list.get(i))){

System.out.println("登录成功");

break;

}

}

用Java编写注册登录程序

什么都不说了 直接给你代码吧

package com.moliying.ui;

import java.awt.BorderLayout;

import java.awt.Container;

import java.awt.FlowLayout;

import java.awt.List;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.BufferedWriter;

import java.io.FileOutputStream;

import java.io.OutputStreamWriter;

import java.util.ArrayList;

import java.util.Arrays;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JPasswordField;

import javax.swing.JTextField;

public class Login {

private JFrame frame = new JFrame("登录");

private Container c = frame.getContentPane();

private JTextField username = new JTextField();

private JPasswordField password = new JPasswordField();

private JButton ok = new JButton("确定");

private JButton cancel = new JButton("取消");

public Login() {

frame.setSize(300, 200);

frame.setBounds(450, 300, 300, 200);

c.setLayout(new BorderLayout());

initFrame();

frame.setVisible(true);

}

private void initFrame() {

// 顶部

JPanel titlePanel = new JPanel();

titlePanel.setLayout(new FlowLayout());

titlePanel.add(new JLabel("系统管理员登录"));

c.add(titlePanel, "North");

// 中部表单

JPanel fieldPanel = new JPanel();

fieldPanel.setLayout(null);

JLabel a1 = new JLabel("用户名:");

a1.setBounds(50, 20, 50, 20);

JLabel a2 = new JLabel("密 码:");

a2.setBounds(50, 60, 50, 20);

fieldPanel.add(a1);

fieldPanel.add(a2);

username.setBounds(110, 20, 120, 20);

password.setBounds(110, 60, 120, 20);

fieldPanel.add(username);

fieldPanel.add(password);

c.add(fieldPanel, "Center");

// 底部按钮

JPanel buttonPanel = new JPanel();

buttonPanel.setLayout(new FlowLayout());

buttonPanel.add(ok);

buttonPanel.add(cancel);

c.add(buttonPanel, "South");

ok.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

System.out.println(username.getText().toString());

}

});

cancel.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

frame.setVisible(false);

}

});

}

public static void main(String[] args) {

// new Login();

String ss = "abbabbbaabbbccba";

System.out.println(ss.split("b").length);

}

}

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");

JLabel lbl2=new JLabel("密码");

JTextField txt=new JTextField(15);

JPasswordField pf=new JPasswordField();

JButton btn1=new JButton("确定");

JButton btn2=new JButton("取消");

public LoginFrm()

{

this.setTitle("登陆");

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

jp.setLayout(new GridLayout(3,2,10,10));

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

jp.add(lbl2);jp.add(pf);

jp.add(btn1);jp.add(btn2);

btn1.addActionListener(this);

btn2.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){}

if(ae.getSource()==btn2)

{

txt.setText("");

pf.setText("");

}

}

}

public static void main(String arg[])

{

JFrame.setDefaultLookAndFeelDecorated(true);

LoginFrm frm=new LoginFrm();

frm.setSize(400,200);

frm.setVisible(true);

}

}

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