JDBC + swing 实例 ——注册登陆界面

介绍

注册登陆小界面，实现了：

用户的登陆，包括：
1. 验证用户名密码是否为空
2. 验证用户名和密码是否正确
3. 清空输入框
用户的注册，包括：
1. 产生新的注册框
2. 验证注册用户名密码是否为空
3. 验证密码和确认密码是否一致
4. 验证用户名是否已存在
5. 清空输入框
退出，包括
1. 退出当前窗口

0. 先放结果图

这里写图片描述

1. 数据库描述

用的是 MySQL

CREATE DATABASE info;
CREATE TABLE info(username VARCHAR(20),password VARCHAR(20));

2. GetConnection 类

获得数据库连接

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class GetConnection {

    private static Connection conn = null;

    static {
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/info", "root", "root");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public static Connection getConn() {
        return conn;
    }
}

3. test 类

实现了登陆界面的绘制
实现了登陆和退出的监听器

import java.awt.GridLayout;
import java.awt.HeadlessException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

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;

public class test extends JFrame{
    private JTextField tusername = null;
    private JPasswordField tpassword = null;

    public void launchFrame() {

        JPanel p1 = new JPanel();
        JPanel p2 = new JPanel();
        JPanel p3 = new JPanel();
        tusername = new JTextField(15);
        tpassword = new JPasswordField(15);
        JButton bRegister = new JButton("注册");
        JButton bLand = new JButton("登陆");
        JButton bExit = new JButton("退出");

        setLayout(new GridLayout(4,2));
        p1.add(new JLabel("用户名：   "));
        p1.add(tusername);
        add(p1);
        p2.add(new JLabel("用户密码："));
        p2.add(tpassword);
        add(p2);
        p3.add(bRegister);
        p3.add(bLand);
        p3.add(bExit);
        add(p3);


        bLand.addActionListener(Register());
        bRegister.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                new Register().launchRegister();
            }
        });
        bExit.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                dispose();
            }
        });

        setTitle("注册登陆");
        pack();
        setLocation(300, 300);
        setVisible(true);
    }

    private ActionListener Register() {
        return new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String username = tusername.getText();
                String password = tpassword.getText();
                if(username.length()==0 || password.length()==0) {
                    JOptionPane.showMessageDialog(null, "账号或密码不为空！");
                    Clear();
                    return ;
                }
                try {
                    Connection conn = GetConnection.getConn();
                    Statement stmt = conn.createStatement();
                    ResultSet rs = stmt.executeQuery("SELECT * FROM info");
                    while(rs.next()) {
                        if(rs.getString(1).equals(username) && rs.getString(2).equals(password)) {
                            JOptionPane.showMessageDialog(null, "登陆成功！");
                            Clear();
                            return ;
                        }   
                    }
                    JOptionPane.showMessageDialog(null, "账号或密码错误！");
                } catch (HeadlessException e1) {
                    e1.printStackTrace();
                } catch (SQLException e1) {
                    e1.printStackTrace();
                }finally {
                    Clear();
                }
            }

            private void Clear() {
                tusername.setText("");
                tpassword.setText("");
            }
        };
    }

    public static void main(String[] args) throws Exception {
        new test().launchFrame();
    }
}

4. Register 类

实现了注册界面

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

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;

public class Register extends JFrame{

    public void launchRegister() {
        JPanel jp1 = new JPanel();
        JPanel jp2 = new JPanel();
        JPanel jp3 = new JPanel();
        JPanel jp4 = new JPanel();
        JTextField t1 = new JTextField(15);
        JPasswordField t2 = new JPasswordField(15);
        JPasswordField t3 = new JPasswordField(15);
        JButton b1 = new JButton("注册");
        JButton b2 = new JButton("退出");

        setLayout(new GridLayout(4,1));
        jp1.add(new JLabel("  用户名："));
        jp1.add(t1);
        this.add(jp1);

        jp2.add(new JLabel("      密码："));
        jp2.add(t2);
        this.add(jp2);

        jp3.add(new JLabel("确认密码："));
        jp3.add(t3);
        this.add(jp3);

        jp4.add(b1);
        jp4.add(b2);
        this.add(jp4);

        b1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                String username = t1.getText();
                String password = t2.getText();
                if(!password.equals(t3.getText())) {
                    JOptionPane.showMessageDialog(null, "密码不一致，请重新输入");
                    Clear(t1, t2, t3);
                    return ;
                }
                if(username.length()==0 || password.length()==0) {
                    JOptionPane.showMessageDialog(null, "账号或密码不为空！");
                    Clear(t1, t2, t3);
                    return ;
                }
                try {
                    Connection conn = GetConnection.getConn();
                    Statement stmt = conn.createStatement();
                    ResultSet rs = stmt.executeQuery("select * from info");
                    while(rs.next()) {
                        if(rs.getString(1).equals(username)) {
                            JOptionPane.showMessageDialog(null, "用户已存在！");
                            Clear(t1, t2, t3);
                            return ;
                        }
                    }
                    stmt.execute("insert info values('" + username + "','" + password + "')");
                    JOptionPane.showMessageDialog(null, "注册成功！");
                    dispose();
                } catch (SQLException e) {
                    e.printStackTrace();
                    JOptionPane.showMessageDialog(null, "注册失败！");
                }
                Clear(t1, t2, t3);
            }

            private void Clear(JTextField t1, JTextField t2, JTextField t3) {
                t1.setText("");
                t2.setText("");
                t3.setText("");
            }
        });

        b2.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                dispose();
            }
        });


        this.setLocation(400, 400);
        this.pack();
        this.setSize(300,300);
        this.setVisible(true);
    }

}

JDBC + swing 实例 ——注册登陆界面

介绍

0. 先放结果图

1. 数据库描述

2. GetConnection 类

3. test 类

4. Register 类

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