如何用Java编写用户注册界面？

界面建议用可视化来做，美观且便捷。下面这个是完全用代码写的，仅供参考。

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import javax.swing.*;

import java.awt.event.*;

import java.awt.*;

import java.sql.*;

public class Register extends JFrame {

JLabel jl1 = new JLabel("用户名");

JTextField jt1 = new JTextField();

JLabel jl2 = new JLabel("邮箱");

JTextField jt2 = new JTextField();

JLabel jl3 = new JLabel("密码");

JPasswordField jpw1 = new JPasswordField();

JLabel jl4 = new JLabel("密码确认");

JPasswordField jpw2 = new JPasswordField();

JButton register = new JButton("注册");

JButton clean = new JButton("清空");

public Register(){

setLayout(new GridLayout(5,2));

add(jl1);

add(jt1);

add(jl2);

add(jt2);

add(jl3);

add(jpw1);

add(jl4);

add(jpw2);

add(register);

add(clean);

String name = jt1.getText();

String email = jt2.getText();

String pw = jpw1.getText();

register.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

try{

Class.forName("com.mysql.jdbc.Driver");

Connection con = DriverManager.getConnection("jdbc:mysql://localhost/db","root","");

Statement sta = con.createStatement();

sta.executeUpdate("INSERT INTO register VALUES(name,email,pw)");

JOptionPane.showMessageDialog(null,"注册成功","提示",JOptionPane.INFORMATION_MESSAGE);

}

catch(Exception ex){

ex.getStackTrace();

}

}

});

clean.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

jt1.setText("");

jt2.setText("");

jpw1.setText("");

jpw2.setText("");

}

});

}

public static void main(String[] args){

Register frame = new Register();

frame.setTitle("用户注册");

frame.setLocationRelativeTo(null);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setSize(400,400);

frame.setVisible(true);

}

}

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);

}

}

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