（帮帮忙）做一个Java客户端登陆界面在第二个界面不会调用第一个界面的文本框输入的用户名

Happy丶lazy 2017-11-18 09:53:40

package cho2;

import java.awt.Font;

import java.awt.Image;

import java.awt.Window;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.AbstractButton;

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;



public class Login extends JFrame implements ActionListener {

	private JPanel pan = new JPanel();

	private JLabel namelab = new JLabel(" 用户名");

	private JLabel passlab = new JLabel(" 密码");

	private JTextField nametext = new JTextField();

	private JPasswordField passtext = new JPasswordField();

	 

	public JButton denglu = new JButton("登录");

	public JButton zhuce = new JButton("注册");

	 

	public Login(){

	    Font font = new Font("宋体",Font.BOLD,12);

	    super.setTitle("欢迎登录本系统");

	    pan.setLayout(null);

	    namelab.setBounds(200, 150, 60, 50);

	    nametext.setBounds(300, 150, 300, 50);

	    passlab.setBounds(200, 250, 60, 50);

	    passtext.setBounds(300, 250, 300, 50);

	    denglu.setBounds(300, 350, 100, 50);

	    zhuce.setBounds(500, 350, 100, 50);   

	    pan.add(namelab);

	    pan.add(nametext);

	    pan.add(passlab);

	    pan.add(passtext);

	    pan.add(denglu);

	    pan.add(zhuce);

	    passtext.setFont(font);

	    zhuce.setFont(font);

	    denglu.addActionListener(this);

	    zhuce.addActionListener(this);

	    super.add(pan);

	    super.setResizable(false); 

	    super.setSize(899, 547);

	    super.setLocationRelativeTo(null);//窗口居中

	    super.setVisible(true);

	}

 

public static void main(String []args){

     

   new Login();

}

 

    @Override

    public void actionPerformed(ActionEvent arg0) {

    if(arg0.getSource()==denglu){

    	denglu();

    }else if (arg0.getSource()==zhuce){

    	zhuce();

    }

 }

    //登录按钮的事件处理函数

    public void denglu(){

        Jdbc d  = new Jdbc();

        String username = nametext.getText();

        String password = passtext.getText();

         if(d.compare(username, password)){

             JOptionPane.showMessageDialog(null,"登录成功！");

             new mainLayout();

             super.setVisible(false);



        }

       }

    //注册按钮触发后的事件处理函数

    public void zhuce(){

        Jdbc d  =  new Jdbc();

       String username = nametext.getText();

        String password = passtext.getText();

         d.insert(username,password);

   }

    

}

package cho2;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

 

import javax.swing.JOptionPane;

 

public class Jdbc {

Connection con = null;

Statement statement = null;

ResultSet res = null;

String driver = "com.mysql.jdbc.Driver";

String url  = "jdbc:mysql://localhost:3306/user";

String name = "root";

String passwd = "123456";

 

public Jdbc(){

   try{

   Class.forName(driver).newInstance();

    con = DriverManager.getConnection(url,name,passwd);

    statement = con.createStatement();

     

    }catch(ClassNotFoundException e){

        System.out.println("对不起，找不到这个Driver");

        e.printStackTrace();

    }catch(SQLException e){

        e.printStackTrace();

    }catch(Exception e){

        e.printStackTrace();

       }

}

public void insert(String username,String password){

    String sql = "insert into user(username,password) values(\""+username+"\",\""+password+"\")";

    try{

        int a = statement.executeUpdate(sql);

        con.close();

        statement.close();

        if(a==1){

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

        }

    }catch(SQLException e){

        JOptionPane.showMessageDialog(null, "对不起该用户名已经有了！");

        e.printStackTrace();

    }

}

//对比用户名和密码是不匹配

public boolean compare(String username,String password){

    boolean m = false;

    String sql = "select password from user where username=\""+username+"\"";

    try{

        res = statement.executeQuery(sql);

        if(res.next()){

            String pa = res.getString(1);

            System.out.println(pa+" " +password);

            if(pa.equals(password)){

                m = true;

            }else {

                JOptionPane.showMessageDialog(null, "密码错误！");

           }

        }else {

            JOptionPane.showMessageDialog(null, "用户名不存在！");

        }

        

        res.close();

        con.close();

        statement.close();

         

    }catch(SQLException e){

        e.printStackTrace();

    }

    return m;

}

}

package cho2;



import java.awt.Font;

import java.awt.event.ActionListener;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JTextField;



public class mainLayout extends JFrame {

	private JPanel pan = new JPanel();

	private JLabel namelab = new JLabel(" 姓名");

	private JLabel NO = new JLabel(" 学号");

	private JLabel dormitory = new JLabel(" 宿舍号");

	private JTextField nametext = new JTextField();

	private JTextField NOtext = new JTextField();

	private JTextField dormitorytext = new JTextField();

	private JTextField image = new JTextField();

	 

	public mainLayout(){

	    Font font = new Font("宋体",Font.BOLD,12);

	    super.setTitle("欢迎登录本系统");

	    pan.setLayout(null);

	    namelab.setBounds(150, 120, 60, 50);

	    nametext.setBounds(250, 120, 150, 50);

	    NO.setBounds(150, 220, 60, 50);

	    NOtext.setBounds(250, 220, 150, 50);

	    dormitory.setBounds(150, 320, 60, 50);

	    dormitorytext.setBounds(250, 320, 150,50);

	    image.setBounds(520, 120, 210, 250);

	    pan.add(namelab);

	    pan.add(nametext);

	    pan.add(NO);

	    pan.add(NOtext);

	    pan.add(dormitory);

	    pan.add(dormitorytext);

	    pan.add(image);

	    super.add(pan);

	    super.setResizable(false); 

	    super.setSize(899, 547);

	    super.setLocationRelativeTo(null);//窗口居中

	    super.setVisible(true);

	}

	public void denglu(){

	String username = nametext.getText();

   }

	}