用户登录编程代码java 用户登录的代码

java写的用户登陆实例，用eclipse开发的具体步奏和代码

import java.awt.Container;

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import java.awt.Font;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;import javax.swing.*;public class Login extends JFrame{

JLabel user,passwd;

JTextField userput;

JPasswordField passput;

JButton denglu,tuichu;

public Login(){

super("用户登录");

Container c=getContentPane();

c.setLayout(null);

Font f=new Font("宋体",Font.PLAIN,12);

user=new JLabel("账号");

passwd=new JLabel("密码");

userput=new JTextField();

passput=new JPasswordField();

denglu=new JButton("登录");

denglu.setFont(f);

denglu.addActionListener(new NewAction());

tuichu=new JButton("退出");

tuichu.setFont(f);

tuichu.addActionListener(new NewAction());

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

userput.setBounds(110,50,150,20);

passwd.setBounds(50,80,60,20);

passput.setBounds(110,80,150,20);

denglu.setBounds(50,160,60,30);

tuichu.setBounds(200,160,60,30);

c.add(user);

c.add(userput);

c.add(passwd);

c.add(passput);

c.add(denglu);

c.add(tuichu);

setSize(350, 300);

setVisible(true);

}

class NewAction implements ActionListener{

String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=CDM";

String user="sa";

String passwd="394513265";

java.sql.Connection con;

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

try{

Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");

con= DriverManager.getConnection(url,user,passwd);

}catch(Exception ep){

JOptionPane.showMessageDialog(null, "加载驱动失败！");

}

if(e.getSource()==denglu){

Find();

}

if(e.getSource()==tuichu){

dispose();

}

} public void Find(){

String lk="select * from login";

try{

Statement sql=con.createStatement();

ResultSet rs=sql.executeQuery(lk);

while(rs.next()){

if(rs.getString(1).equals(userput.getText()) rs.getString(2).equals(passput.getText()))

new MainClient();

else

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

}

rs.close();

}catch(SQLException p){

JOptionPane.showMessageDialog(null, p.getMessage());

}

}

}

public static void main(String[] args) {

Login l=new Login();

l.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

}

步骤就是建个工程 然后建个class

用java编程实现用户注册并进行登录操作

String username = "",password = "",passwordagain = ""; // 定义用户名和密码

将该变量等于为全局变量 或局部变量即可

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();

}

}

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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