我在java中制作桌面应用程序，我需要一些帮助，
我使用sql数据库存储用户的所有信息，例如UserName，Password，全名。 我有2个框架，第一个是登录框架，管理员输入他的用户名和密码，如果它与sql数据库的详细信息匹配，那么它将带他到下一个框架，即管理面板，现在我想要的管理员全名应显示在NorthPanel的第二帧（即管理面板）的左上角， 这是我的两个框架的代码，请帮助
如何获取从sql数据库登录并在管理面板中显示的管理员名称？
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.*;
import java.sql.*;
import java.awt.*;
import javax.swing.*
public class Login extends JFrame implements ActionListener, KeyListener, FocusListener, WindowListener
{
JPanel UserPanel,NorthPanel;
JLabel UserId,UserPassword;
JLabel LblFrgtPass;
JTextField TxtUser;
JPasswordField TxtUserPass;
JButton BtnLogin;
Connection con=null;
Statement stmt=null;
ResultSet rs=null;
boolean flag=false;
public Login()
{
add(GetUserPanel(), BorderLayout.CENTER);
add(GetNorthPanel(), BorderLayout.NORTH);
addWindowListener(this);
}
public boolean GetConnection()
{
flag=false;
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con=DriverManager.getConnection("jdbc:odbc:Project");
stmt=con.createStatement();
flag=true;
}catch(Exception ex)
{
ex.printStackTrace();
flag=false;
}
return flag;
}
public boolean CloseConnection()
{
flag=false;
try
{
if(con!=null)
{
con.close();
flag=true;
}
}catch(Exception ex)
{
flag=false;
}
return flag;
}
public ResultSet GetRecords(String sql)
{
rs=null;
try
{
rs=stmt.executeQuery(sql);
}catch(Exception ex)
{
rs=null;
}
return rs;
}
JPanel GetNorthPanel()
{
NorthPanel = new JPanel();
NorthPanel.setLayout(new FlowLayout());
ImageIcon titleIcon = new ImageIcon("titleicon.png");
JLabel title = new JLabel(titleIcon);
NorthPanel.add(title);
NorthPanel.setBackground(Color.white);
return NorthPanel;
}
JLabel GetLblForgetPassword()
{
LblFrgtPass = new JLabel("Forgot Password ? ");
return LblFrgtPass;
}
JPanel GetUserPanel()
{
UserPanel=new JPanel();
UserPanel.setLayout(new GridBagLayout());
UserPanel.setBackground(Color.WHITE);
GridBagConstraints GbcUserId = new GridBagConstraints();
GbcUserId.gridx=1;
GbcUserId.gridy=3;
GbcUserId.fill=GridBagConstraints.BOTH;
GbcUserId.insets = new Insets(10, 70, 0, 0);
UserPanel.add(GetUserId(),GbcUserId);
GridBagConstraints GbcTxtUser = new GridBagConstraints();
GbcTxtUser.gridx=2;
GbcTxtUser.gridy=3;
GbcTxtUser.insets = new Insets(10, 40, 0, 0);
UserPanel.add(GetTxtUser(),GbcTxtUser);
GridBagConstraints GbcUserPassword = new GridBagConstraints();
GbcUserPassword.gridx=1;
GbcUserPassword.gridy=4;
GbcUserPassword.fill=GridBagConstraints.BOTH;
GbcUserPassword.insets = new Insets(10, 70, 0, 0);
UserPanel.add(GetUserPassword(),GbcUserPassword);
GridBagConstraints GbcTxtUserPass = new GridBagConstraints();
GbcTxtUserPass.gridx=2;
GbcTxtUserPass.gridy=4;
GbcTxtUserPass.insets = new Insets(10, 40, 0, 0);
UserPanel.add(GetTxtUserPass(),GbcTxtUserPass);
GridBagConstraints GbcBtnLogin = new GridBagConstraints();
GbcBtnLogin.gridx=2;
GbcBtnLogin.gridy=5;
GbcBtnLogin.insets = new Insets(50, 50, 20, 20);
UserPanel.add(GetBtnLogin(),GbcBtnLogin);
GridBagConstraints GbcLblFrgtPass = new GridBagConstraints();
GbcLblFrgtPass.gridx=3;
GbcLblFrgtPass.gridy=5;
GbcLblFrgtPass.insets = new Insets(50, 0, 20, 20);
UserPanel.add(GetLblFrgtPass(),GbcLblFrgtPass);
return UserPanel;
}
JLabel GetUserId()
{
UserId = new JLabel("User Id : ");
UserId.setFont(new Font("Bookman Old Style", Font.PLAIN, 14));
return UserId;
}
JTextField GetTxtUser()
{
TxtUser = new JTextField(10);
TxtUser.addKeyListener(this);
TxtUser.addFocusListener(this);
return TxtUser;
}
JLabel GetUserPassword()
{
UserPassword = new JLabel("Password : ");
UserPassword.setFont(new Font("Bookman Old Style", Font.PLAIN, 14));
return UserPassword;
}
JPasswordField GetTxtUserPass()
{
TxtUserPass = new JPasswordField(10);
TxtUserPass.addKeyListener(this);
TxtUserPass.addFocusListener(this);
return TxtUserPass;
}
JLabel GetLblFrgtPass()
{
LblFrgtPass = new JLabel("Forgot Passord ?");
return LblFrgtPass;
}
JButton GetBtnLogin()
{
BtnLogin = new JButton(" LogIn ");
//Project1 p = new Project1();
BtnLogin.addActionListener(this);
BtnLogin.setFont(new Font("Bookman Old Style", Font.PLAIN, 14));
BtnLogin.registerKeyboardAction(BtnLogin.getActionForKeyStroke(
KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0, false)),
KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, false),
JComponent.WHEN_FOCUSED);
BtnLogin.registerKeyboardAction(BtnLogin.getActionForKeyStroke(
KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0, true)),
KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, true),
JComponent.WHEN_FOCUSED);
return BtnLogin;
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==BtnLogin)
{
String User_Id = TxtUser.getText().trim();
String User_Pass = TxtUserPass.getText().trim();
String sql = "Select * from users where UserId = '"+User_Id+"' and Password= '"+User_Pass+"'";
if(GetConnection()==true)
{
try
{
rs =GetRecords(sql);
int count = 0;
String usertype="";
while(rs.next())
{
count = count + 1;
usertype=rs.getString(3);
}
if(count ==1)
{
if(usertype.equalsIgnoreCase("student"))
{
JOptionPane.showMessageDialog(null, "Student Frame");
}
else if(usertype.equalsIgnoreCase("teacher"))
{
JOptionPane.showMessageDialog(null, "Teacher Frame");
}
else if(usertype.equalsIgnoreCase("admin"))
{
Admin frame=new Admin();
frame.setSize(600, 400);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
dispose();
}
else
{
JOptionPane.showMessageDialog(null, "User Not Found!");
}
}
catch(Exception ex)
{
//ex.printStackTrace();
System.err.println("ERROR2");
}
}
else
{
System.out.println("Not Connected");
}
}
}
public void keyTyped(KeyEvent ex)
{
//ASCII :American Standard Code for Information Interchange
}
public void keyPressed(KeyEvent ex)
{
System.out.println(ex.getKeyCode());
if(ex.getKeyCode()==10 && ex.getSource()==TxtUser)
{
TxtUserPass.requestFocus();
}
else if(ex.getKeyCode()==10 && ex.getSource()==TxtUserPass)
{
BtnLogin.requestFocus();
}
else if(ex.getKeyCode()==10 && ex.getSource()==BtnLogin)
{
JOptionPane.showMessageDialog(null, "User Not Found!");
}
}
public void keyReleased(KeyEvent ex)
{
if(ex.getKeyCode()==10 && ex.getSource()==TxtUserPass)
{
// JOptionPane.showMessageDialog(null, "User Not Found!");
}
}
public void focusGained(FocusEvent ex)
{
if(ex.getSource()==TxtUser)
{
TxtUser.setBackground(Color.white);
}
else if(ex.getSource()==TxtUserPass)
{
TxtUserPass.setBackground(Color.white);
}
}
public void focusLost(FocusEvent ex)
{
if(ex.getSource()==TxtUser)
{
TxtUser.setBackground(Color.white);
}
else if(ex.getSource()==TxtUserPass)
{
TxtUserPass.setBackground(Color.white);
}
}
public void windowActivated(WindowEvent ex)
{
}
public void windowDeactivated(WindowEvent ex)
{
}
public void windowIconified(WindowEvent ex)
{
}
public void windowDeiconified(WindowEvent ex)
{
}
public void windowClosing(WindowEvent ex)
{
//JOptionPane.showMessageDialog(null,"GoodBye","Exit LogIn",JOptionPane.PLAIN_MESSAGE);
}
public void windowClosed(WindowEvent ex)
{
}
public void windowOpened(WindowEvent ex)
{
}
public static void main(String[] args)
{
Login Frame = new Login();
Frame.setResizable(false);
Frame.setSize(600,400);
Frame.setLocationRelativeTo(null);
Frame.setVisible(true);
Frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
以下代码是第二帧
import java.awt.*;
import javax.swing.*;
import java.sql.*;
public class Admin extends Login {
JFrame frame = new JFrame("Admin");
JPanel panel;
JPanel nPanel;
JLabel logOut;
JLabel UserName;
JButton btn1;
JButton btn2;
JButton btn3;
JButton btn4;
JButton btn5;
JButton btn6;
private Connection con = null;
private Statement stmt = null;
private ResultSet rs = null;
boolean flag = false;
//****************MAIN CONSTRUCTOR******************************************
public Admin(){
add(GetNPanel(), BorderLayout.NORTH);
add(GetCPanel(), BorderLayout.CENTER);
}
//****************SQL CONNECTION********************************************
public boolean GetConnection(){
flag = false;
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection("jdbc:odbc:Project");
//System.out.println("Connected");
stmt = con.createStatement();
flag=true;
}
catch(Exception ex){
ex.printStackTrace();
flag = false;
}
return flag;
}
//****************CENTER PANEL**********************************************
JPanel GetCPanel(){
panel = new JPanel();
panel.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
//gbc.insets = new Insets(1, 1, 1, 1); //cell padding
gbc.fill = GridBagConstraints.BOTH; //fill cell area
gbc.weightx = 1; // fill horizontal cell area
gbc.weighty = 1; //fill vertical cell area
//btn1
btn1 = new JButton(new ImageIcon("teacher.png"));
btn1.setToolTipText("Add / Edit / Remove Teachers");
gbc.gridx = 0;
gbc.gridy = 0;
panel.add(btn1, gbc);
//btn2
btn2 = new JButton(new ImageIcon("student.png"));
gbc.gridx = 1;
gbc.gridy = 0;
panel.add(btn2, gbc);
//btn3
btn3 = new JButton(new ImageIcon("notice.png"));
gbc.gridx = 2;
gbc.gridy = 0;
panel.add(btn3, gbc);
//btn4
btn4 = new JButton(new ImageIcon("complaints.png"));
gbc.gridx = 0;
gbc.gridy = 1;
panel.add(btn4, gbc);
//btn5
btn5 = new JButton(new ImageIcon("messages.png"));
gbc.gridx = 1;
gbc.gridy = 1;
panel.add(btn5, gbc);
//btn6
btn6 = new JButton(new ImageIcon("password.png"));
gbc.gridx = 2;
gbc.gridy = 1;
panel.add(btn6, gbc);
return panel;
}
JPanel GetNPanel()
{
nPanel = new JPanel();
return nPanel;
}
//****************NORTH PANEL***********************************************
public static void main(String[] args)
{
new Admin();
Admin frame = new Admin();
//FRAME
frame.setSize(600, 400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.setLocationRelativeTo(null);
frame.setResizable(false);
}
}
答案 0 :(得分：1)
我会有一个setName方法，它接受一个字符串变量，然后设置标签的文本。
Public void setName(String name){
Label.setText(name)
}
然后我会在登录成功后调用该方法。
答案 1 :(得分：1)
您正在从AdminPanel帧延长Login帧。您可以做的是在Login框架中创建一个实例变量，并在登录成功时将用户全名的值存储到其中。
由于AdminPanel继承了Login框架，因此它会自动获取用户全名的值。然后，您可以在左侧角落的AdminPanel中获取任何JLabel，并在那里设置文本实例变量的值。