java代码写的登录代码 java登录代码

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

怎么用JAVA写一个用户登入程序

同意楼上的说法，具体点可以这样：创建一个用户表，里边包括LoginName（登录名），UserName（用户名），Password（密码），Age（年龄），Address（地址）。然后编写Java程序（用MVC架构）模型层（M）：DBConnection.java（负责连接数据库）

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.*;

public class DBConnection {

private static final String DRIVER_CLASS = "sun.jdbc.odbc.JdbcOdbcDriver";

private static final String DB_URL = "jdbc:odbc:text";

public DBConnection() {

}

public static Connection getConnection() {

Connection conn = null;

try {

Class.forName(DRIVER_CLASS);

conn = DriverManager.getConnection(DB_URL);

} catch (SQLException ex) {

System.out.println(ex.getMessage());

} catch (ClassNotFoundException ex) {

System.out.println(ex.getMessage());

}

return conn;

}

}

第2个负责数据库查询操作的类：DBUserManager.java

import edu.systop.text.model.entity.User;

import edu.systop.text.model.dao.DBConnection;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.DriverManager;

import java.sql.*;

public class DBUserManager {

private static final String SQL_SELECT =

"SELECT LoginName,UserName,PassWord,Age,Address FROM UserInfo WHERE LoginName = ? AND PassWord = ?";

public DBUserManager() {

}

public boolean checkDB(User u) {

boolean b = false;

Connection conn = null;

PreparedStatement psmt = null;

ResultSet rs = null;

conn = DBConnection.getConnection();

try {

psmt = conn.prepareStatement(SQL_SELECT);

psmt.setString(1, u.getLoginName());

psmt.setString(2, u.getPassWord());

rs = psmt.executeQuery();

b = rs.next();

if (rs.next()) {

b = true;

}

} catch (SQLException ex) {

System.out.println(ex.getMessage());

} finally {

cleanDB(rs, psmt, conn);

}

return b;

}

public User checkBC(User u) {

Connection conn = null;

PreparedStatement psmt = null;

ResultSet rs = null;

User tmp = new User();

conn = DBConnection.getConnection();

try {

psmt = conn.prepareStatement(SQL_SELECT);

psmt.setString(1, u.getLoginName());

psmt.setString(2, u.getPassWord());

rs = psmt.executeQuery();

if (rs.next()) {

tmp.setLoginName(rs.getString(1));

tmp.setUserName(rs.getString(2));

tmp.setAge(rs.getInt(4));

tmp.setAddress(rs.getString(5));

}

} catch (SQLException ex) {

System.out.println(ex.getMessage());

} finally {

cleanDB(rs, psmt, conn);

}

return tmp;

}

public void cleanDB(ResultSet rs, PreparedStatement psmt, Connection conn) {

try {

if (rs != null) {

rs.close();

}

if (psmt != null) {

psmt.close();

}

if (conn != null) {

conn.close();

}

} catch (SQLException ex) {

System.out.println(ex.getMessage());

}

}

第3个实体用户类：User.java

package edu.systop.text.model.entity;

public class User {

private String loginName;

private String userName;

private String passWord;

private int age;

private String address;

public User() {

}

public void setLoginName(String loginName) {

this.loginName = loginName;

}

public void setUserName(String userName) {

this.userName = userName;

}

public void setPassWord(String passWord) {

this.passWord = passWord;

}

public void setAge(int age) {

this.age = age;

}

public void setAddress(String address) {

this.address = address;

}

public String getLoginName() {

return loginName;

}

public String getUserName() {

return userName;

}

public String getPassWord() {

return passWord;

}

public int getAge() {

return age;

}

public String getAddress() {

return address;

}

}

然后编写控制层（C）：GetInfoServlet.java

package edu.systop.text.control;

import javax.servlet.*;

import javax.servlet.http.*;

import java.io.*;

import java.util.*;

import edu.systop.text.model.entity.User;

import edu.systop.text.model.service.UserManager;

public class GetInfoServlet extends HttpServlet {

private static final String CONTENT_TYPE = "text/html; charset=GBK";

//Initialize global variables

public void init() throws ServletException {

}

//Process the HTTP Get request

public void doGet(HttpServletRequest request, HttpServletResponse response) throws

ServletException, IOException {

}

//Process the HTTP Post request

public void doPost(HttpServletRequest request, HttpServletResponse response) throws

ServletException, IOException {

String loginName = request.getParameter("loginName");

String passWord = request.getParameter("passWord");

User u = new User();

u.setLoginName(loginName);

u.setPassWord(passWord);

UserManager m = new UserManager();

RequestDispatcher d;

if (m.checkUser(u)) {

User o = m.checkBC(u);

request.setAttribute("JavaBEAN",o);

d = request.getRequestDispatcher("GetInfoUser.jsp");

} else {

d = request.getRequestDispatcher("GetInfoFinale.jsp");

}

d.forward(request, response);

}

//Clean up resources

public void destroy() {

}

}

最后，创建表示层（V）：包括3个Jsp（登录页面GetInfo.jsp、登录成功页面GetInfoUser.jsp、登录失败页面GetInfoFinale.jsp）

上面的就是Jsp结合Servlet用MVC架构写的用户登录程序。

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);

}

}

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 class Test26 {

public static void main(String[] args) {

final String userName = "abc";

final String passwrod = "123";

JFrame jFrame = new JFrame("登陆界面");

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

jFrame.setBounds(((int)dimension.getWidth() - 200) / 2, ((int)dimension.getHeight() - 300) / 2, 200, 150);

jFrame.setResizable(false);

jFrame.setLayout(null);

jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JLabel label1 = new JLabel("姓名");

label1.setBounds(10, 10, 100, 30);

jFrame.add(label1);

JLabel label2 = new JLabel("密码");

label2.setBounds(10, 40, 100, 30);

jFrame.add(label2);

final JTextField text1 = new JTextField();

text1.setBounds(50, 15, 130, 20);

jFrame.add(text1);

final JPasswordField text2 = new JPasswordField();

text2.setBounds(50, 45, 130, 20);

jFrame.add(text2);

JButton button = new JButton("Login");

button.setBounds(10, 75, 170, 40);

button.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

if(userName.equals(text1.getText())  passwrod.equals(text2.getText())) {

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("");

text2.setText("");

}

}

});

jFrame.add(button);

jFrame.setVisible(true);

}

}

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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();

}

}