Java无法连接数据库

问题描述

大家！我正在做一个需要连接数据库（MySQL 工作台）的项目（Java Eclipse）。 但我面临的问题是登录页面。我已经建立了一个帐户和密码数据库，我使用 JFrame 连接该数据库以在登录页面中使用。我在数据库中建立了 student_ID = 'S0761129' 和 student_Password = 'S0761129' 。但是，我在 JFrame 中输入了相同的内容。但系统显示“帐户和密码不正确”。其实我已经上网了，按照步骤操作。不幸的是，我无法运行该程序。希望大家给我一些建设性的建议。这是完整的代码。

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.sql.*;
import javax.swing.JOptionPane;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import java.awt.Font;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class LoginPage extends JFrame {

    private JPanel contentPane;
    private JTextField account;
    private JTextField password;

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    LoginPage frame = new LoginPage();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    public LoginPage() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100,100,297,300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5,5,5));
        setContentPane(contentPane);
        contentPane.setLayout(null);

        JLabel lblId = new JLabel("ID");
        lblId.setFont(new Font("新細明體",Font.PLAIN,18));
        lblId.setBounds(41,84,49,37);
        contentPane.add(lblId);

        account = new JTextField();
        account.setBounds(101,92,121,21);
        contentPane.add(account);
        account.setColumns(10);

        JLabel lblPassword = new JLabel("Password");
        lblPassword.setFont(new Font("新細明體",18));
        lblPassword.setBounds(26,134,136,20);
        contentPane.add(lblPassword);

        password = new JTextField();
        password.setBounds(99,137,120,21);
        contentPane.add(password);
        password.setColumns(10);

        JLabel lblLoginSystem = new JLabel("Login System");
        lblLoginSystem.setFont(new Font("標楷體",30));
        lblLoginSystem.setBounds(56,22,239,52);
        contentPane.add(lblLoginSystem);

        JButton Login = new JButton("Login");


        Login.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                try {
                    Class.forName("com.mysql.jdbc.Driver");
                    Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/school_project","root","");
                    Statement stmt = con.createStatement();
                    String sql = "Select * from student_info where ID = 0 and Student_ID='" + account.getText() + "' and Student_Password = '" + password.toString() + "'";
                    ResultSet rs = stmt.executeQuery(sql);
                    if (rs.next())
                        JOptionPane.showMessageDialog(null,"Login Sucessfully...");
                    else
                        JOptionPane.showMessageDialog(null,"Incorrect Account and Password...");
                    con.close();
                } catch (Exception e) {
                    System.out.print(e);
                }
            }
        });
        Login.setBounds(56,190,76,23);
        contentPane.add(Login);

        JButton Reset = new JButton("Reset");
        Reset.setBounds(142,86,23);
        contentPane.add(Reset);
    }
}

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

小编邮箱:dio#foxmail.com (将#修改为@）