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java简单登陆注册代码 java注册登录界面代码
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java语言实现用户注册和登录
//这个是我写的，里面有连接数据库的部分。你可以拿去参考一下
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.sql.*;
class LoginFrm extends JFrame implements ActionListener// throws Exception
{
JLabel lbl1 = new JLabel("用户名:");
JLabel lbl2 = new JLabel("密码:");
JTextField txt = new JTextField(5);
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, 5, 5));
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("com.mysql.jdbc.Driver");// mysql数据库
Connection con = DriverManager.getConnection(
"jdbc:mysql://localhost/Car_zl", "root", "1");// 数据库名为Car_zl，密码为1
System.out.println("com : "+ con);
Statement cmd = con.createStatement();
String sql = "select * from user where User_ID='"
+ txt.getText() + "' and User_ps='"
+ pf.getText() + "'" ;
ResultSet rs = cmd
.executeQuery(sql);// 表名为user，user_ID和User_ps是存放用户名和密码的字段名
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) {
System.out.println("1111111111111");
//txt.setText("");
//pf.setText("");
System.exit(0);
}
}
}
public static void main(String arg[]) {
JFrame.setDefaultLookAndFeelDecorated(true);
LoginFrm frm = new LoginFrm();
frm.setSize(400, 200);
frm.setVisible(true);
}
}
相关问答
Q1: java编写一个用户注册及登录界面
mport java.awt.HeadlessException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
@SuppressWarnings("serial")
public class MainFrame extends JFrame {
JLabel lbl1 = new JLabel("用户名:");
JLabel lbl2 = new JLabel("密 码:");
JTextField txt = new JTextField("admin",20);
JPasswordField pwd = new JPasswordField(20);
JButton btn = new JButton("登录");
JPanel pnl = new JPanel();
private int error = 0;
public MainFrame(String title) throws HeadlessException {
super(title);
init();
}
private void init() {
this.setResizable(false);
pwd.setEchoChar('*');
pnl.add(lbl1);
pnl.add(txt);
pnl.add(lbl2);
pnl.add(pwd);
pnl.add(btn);
this.getContentPane().add(pnl);
btn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if ("admin".equals(new String(pwd.getPassword()))){
pnl.removeAll();
JLabel lbl3 = new JLabel();
ImageIcon icon = new ImageIcon(this.getClass().getResource("pic.jpg"));
lbl3.setIcon(icon);
pnl.add(lbl3);
}
else{
if(error 3){
JOptionPane.showMessageDialog(null,"密码输入错误，请再试一次");
error++;
}
else{
JOptionPane.showMessageDialog(null,"对不起，您不是合法用户");
txt.setEnabled(false);
pwd.setEnabled(false);
btn.setEnabled(false);
}
}
}
});
}
public static void main(String[] args) {
MainFrame frm = new MainFrame("测试");
frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frm.setBounds(100, 100, 300, 120);
frm.setVisible(true);
}
}
Q2: 求用java实现简单的登录和注册功能，主要是为了了解怎样对数据库进行增删改查。和各种请求处理，
//User 用户的基本信息，也是USERINFO表中的3个列
package
登陆判断;
public class User {
private String name;
private String loginname;
private String
loginpsw;
public String getName() {
return name;
}
public
void setName(String name) {
this.name = name;
}
public String
getLoginname() {
return loginname;
}
public void
setLoginname(String loginname) {
this.loginname =
loginname;
}
public String getLoginpsw() {
return
loginpsw;
}
public void setLoginpsw(String loginpsw)
{
this.loginpsw = loginpsw;
}
}
//用于注册和登陆的小小代码块
package
登陆判断;
import java.util.Scanner;
public class In {
public static User getUser(){
User u = new User();
Scanner sc =
new
Scanner(System.in);
System.out.println("请输入登陆名");
u.setLoginname(sc.nextLine());
System.out.println("请输入密码");
u.setLoginpsw(sc.nextLine());
return
u;
}
public static User registerUser(){
User u = new
User();
Scanner sc = new
Scanner(System.in);
System.out.println("请注册用户名名");
u.setName(sc.nextLine());
System.out.println("请注册登陆名");
u.setLoginname(sc.nextLine());
System.out.println("请注册密码");
u.setLoginpsw(sc.nextLine());
return
u;
}
}
//登陆时的检查，判断登陆名和密码是否正确，正确则返回 用户名
package 登陆判断;
import java.sql.Connection;
import java.sql.DriverManager;
import
java.sql.PreparedStatement;
import java.sql.ResultSet;
import
java.sql.SQLException;
public class Check {
public static void checkUser(User u)
{
try
{
Class.forName("oracle.jdbc.driver.OracleDriver");
} catch
(ClassNotFoundException e) {
e.printStackTrace();
}
String
url = "jdbc:oracle:thin:@localhost:1521:orcl";
String user =
"scott";
String password = "tiger";
Connection conn =
null;
ResultSet rs = null;
PreparedStatement pst =
null;
String sql = "Select name from USERINFO where loginname = ? and
loginpsw = ? ";
try {
conn = DriverManager.getConnection(url, user,
password);
pst = conn.prepareStatement(sql);
pst.setString(1,
u.getLoginname());
pst.setString(2,u.getLoginpsw());
rs =
pst.executeQuery();
while(rs.next()){
u.setName(rs.getString(1));
}
}
catch (SQLException e) {
e.printStackTrace();
}finally{
try
{
rs.close();
pst.close();
conn.close();
} catch
(SQLException e)
{
e.printStackTrace();
}
}
if(u.getName() == null ||
u.getName().isEmpty()){
System.out.println("登陆失败");
}else{
System.out.println("欢迎"+u.getName()+"登陆");
}
}
}
//注册界面，要判断 登陆名是否有重复，有重复则注册失败。有点小疑问，已用注释标出来
package 登陆判断;
import java.sql.Connection;
import java.sql.DriverManager;
import
java.sql.PreparedStatement;
import java.sql.ResultSet;
import
java.sql.SQLException;
import java.sql.Statement;
public class Register {
public static void registUser(User u){
try
{
Class.forName("oracle.jdbc.driver.OracleDriver");
} catch
(ClassNotFoundException e) {
e.printStackTrace();
}
String
url = "jdbc:oracle:thin:@localhost:1521:orcl";
String user =
"scott";
String password = "tiger";
Connection conn =
null;
String sql = "Insert Into USERINFO
values(?,?,?)";
PreparedStatement pst =
null;
//判断登陆名是否已经存在
Statement s = null;
ResultSet rs =
null;
String sql_ck = "Select LOGINNAME FROM USERINFO";
try
{
conn = DriverManager.getConnection(url, user, password);
pst =
conn.prepareStatement(sql);
pst.setString(1,
u.getName());
pst.setString(2, u.getLoginname());
pst.setString(3,
u.getLoginpsw());
//判断登陆名是否已经存在
s =
conn.createStatement();
rs =
s.executeQuery(sql_ck);
while(rs.next()){//为什么用 rs.getString(2)会提示
无效的索引呢
if( rs.getString("LOGINNAME").equals(u.getLoginname())
){
System.out.println("登陆名已经存在，注册失败");
break;
}else{
pst.executeUpdate();
System.out.println("注册成功");
break;
}
}
}
catch (SQLException e) {
e.printStackTrace();
}finally{
try
{
rs.close();
pst.close();
s.close();
conn.close();
}
catch (SQLException e)
{
e.printStackTrace();
}
}
}
}
//main界面//
//数据库中表的结构式这样
//name(用户名，用于显示),
//loginname(登录名,即登陆时输入的ID)
//loginpsw(登陆时输入的密码)
package
登陆判断;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
int chos = 0;
Scanner sc = new
Scanner(System.in);
System.out.println("\t\t登陆请按1\t\t注册请按2");
chos =
sc.nextInt();
switch(chos){
case 1:
Check.checkUser(In.getUser());break;
case 2:
Register.registUser(In.registerUser());break;
default:
System.out.println("请输入正确的选择");break;
}
}
}
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