问题描述
我一直在寻找这个好几天了，但我还没有找到解决方案，所以我刚刚注册了我的帐户。
我想弄清楚我应该如何从 JFrame 中的当前 JPanel 打开另一个 JPanel。到目前为止，我在视图包中创建了三个类：mainView (JFrame)、loginAs (JPanel)、loginPanel (JPanel)。我想要做的是，我想将 loginAs 面板显示为我的第一个面板，用户可以在其中选择他是管理员还是员工，然后单击所需的选项后，它应该打开可以登录的 loginPanel。我被卡住了在这里，因为我不知道如何将用户选择了 Admin 或 Staff 的信息返回给 mainView，而 mainView 现在应该移动到下一个面板，即 loginPanel。
这是我做的编码：
主视图
package view;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Font;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import java.awt.cardlayout;
import java.awt.Color;
public class mainView extends JFrame {
private JPanel contentPane;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokelater(new Runnable() {
public void run() {
try {
mainView frame = new mainView();
frame.setVisible(true);
} catch (Exception e) {
e.printstacktrace();
}
}
});
}
/**
* Create the frame.
*/
public mainView() {
setTitle("COVID'19 Management System");
setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100,100,550,410);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5,5,5));
setContentPane(contentPane);
contentPane.setLayout(new cardlayout(0,0));
JPanel p1 = new loginAs();
contentPane.add(p1,"t1");
JPanel p2 = new loginPanel();
contentPane.add(p2,"t2");
JPanel p3 = new JPanel();
contentPane.add(p3,"t3");
JPanel p4 = new JPanel();
contentPane.add(p4,"t4");
}
}
登录身份
package view;
import java.awt.cardlayout;
import java.awt.Color;
import java.awt.Font;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import view.mainView;
public class loginAs extends JPanel {
/**
* Create the panel.
*/
public loginAs() {
setBackground(Color.BLACK);
setLayout(null);
JLabel lblNewLabel = new JLabel("COVID'19 Management System");
lblNewLabel.setForeground(Color.WHITE);
lblNewLabel.setFont(new Font("Calibri",Font.BOLD,18));
lblNewLabel.setBounds(140,27,262,28);
add(lblNewLabel);
JLabel lblNewLabel_1 = new JLabel("LOGIN AS");
lblNewLabel_1.setForeground(Color.WHITE);
lblNewLabel_1.setFont(new Font("Calibri",16));
lblNewLabel_1.setBounds(35,87,97,28);
add(lblNewLabel_1);
JButton btnAdmin = new JButton("ADMIN");
btnAdmin.setForeground(Color.BLACK);
btnAdmin.setBackground(Color.WHITE);
btnAdmin.setBounds(35,134,39);
add(btnAdmin);
btnAdmin.setBorderPainted(false);
btnAdmin.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseEntered(java.awt.event.MouseEvent evt) {
btnAdmin.setBackground(Color.GREEN);
}
public void mouseExited(java.awt.event.MouseEvent evt) {
btnAdmin.setBackground(Color.WHITE);
}
public void mouseClicked(java.awt.event.MouseEvent e)
{
}
});
JButton btnStaff = new JButton("STAFF");
btnStaff.setForeground(Color.BLACK);
btnStaff.setBackground(Color.WHITE);
btnStaff.setBounds(35,200,39);
add(btnStaff);
btnStaff.setBorderPainted(false);
btnStaff.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseEntered(java.awt.event.MouseEvent evt) {
btnStaff.setBackground(Color.GREEN);
}
public void mouseExited(java.awt.event.MouseEvent evt) {
btnStaff.setBackground(Color.WHITE);
}
public void mouseClicked(java.awt.event.MouseEvent e)
{
}
});
}
}
登录面板
package view;
import javax.swing.JPanel;
import javax.swing.JLabel;
import java.awt.Font;
import java.awt.Color;
import javax.swing.JTextField;
import javax.swing.JButton;
public class loginPanel extends JPanel {
private JTextField txt_uname;
private JTextField txt_pass;
/**
* Create the panel.
*/
public loginPanel() {
setBackground(Color.BLACK);
setLayout(null);
JLabel lblNewLabel = new JLabel("COVID'19 Management System");
lblNewLabel.setForeground(Color.WHITE);
lblNewLabel.setFont(new Font("Calibri",28);
add(lblNewLabel);
JLabel lblNewLabel_1 = new JLabel("LOGIN PAGE");
lblNewLabel_1.setForeground(Color.WHITE);
lblNewLabel_1.setFont(new Font("Calibri",28);
add(lblNewLabel_1);
JLabel lblNewLabel_2 = new JLabel("Username");
lblNewLabel_2.setFont(new Font("Calibri",14));
lblNewLabel_2.setForeground(Color.WHITE);
lblNewLabel_2.setBounds(35,142,74,14);
add(lblNewLabel_2);
txt_uname = new JTextField();
txt_uname.setBounds(123,137,147,20);
add(txt_uname);
txt_uname.setColumns(10);
JLabel lblNewLabel_2_1 = new JLabel("Password");
lblNewLabel_2_1.setForeground(Color.WHITE);
lblNewLabel_2_1.setFont(new Font("Calibri",14));
lblNewLabel_2_1.setBounds(35,188,14);
add(lblNewLabel_2_1);
txt_pass = new JTextField();
txt_pass.setColumns(10);
txt_pass.setBounds(123,183,20);
add(txt_pass);
JButton btn_login = new JButton("Login");
btn_login.setBounds(123,229,89,23);
add(btn_login);
}
}
这是视觉表现：
解决方法
我接受了您的代码，对其进行了清理，并在第一页上为 ActionListener 添加了一个 JButtons。
这是 GUI 的第一页。
这是 GUI 第二页。
我做的第一件事就是摆脱绝对定位。我在两个 GridBagLayout 上都使用了 JPanels。
接下来我做的是考虑鼠标输入和鼠标移出的按钮颜色。
我创建了一个应用程序模型来保存我看到的变量。最终，这个模型将保存整个应用程序的所有变量。
我创建了所有类的内部类，以便我可以将此代码复制并粘贴到一个块中。你可以而且应该将我的内部类分成不同的类。
这是完整的可运行代码。
import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.LayoutManager;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;
public class Covid19GUI extends JFrame {
private static final long serialVersionUID = 1L;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
new Covid19GUI();
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
private Covid19Model model;
private JPanel contentPane;
/**
* Create the frame.
*/
public Covid19GUI() {
this.model = new Covid19Model();
setTitle("COVID'19 Management System");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5,5,5));
contentPane.setLayout(new CardLayout(5,5));
JPanel p1 = new LoginAs(this,model);
contentPane.add(p1,"t1");
JPanel p2 = new LoginPanel(this,model);
contentPane.add(p2,"t2");
JPanel p3 = new JPanel();
contentPane.add(p3,"t3");
JPanel p4 = new JPanel();
contentPane.add(p4,"t4");
add(contentPane,BorderLayout.CENTER);
pack();
setLocationByPlatform(true);
setVisible(true);
}
public JPanel getCardLayoutPanel() {
return contentPane;
}
public class LoginAs extends JPanel {
private static final long serialVersionUID = 1L;
/**
* Create the panel.
*/
public LoginAs(Covid19GUI frame,Covid19Model model) {
setBackground(Color.BLACK);
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.anchor = GridBagConstraints.CENTER;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.insets = new Insets(5,5);
gbc.gridx = 0;
gbc.gridy = 0;
JLabel lblNewLabel = new JLabel("COVID'19 Management System");
lblNewLabel.setForeground(Color.WHITE);
lblNewLabel.setFont(new Font("Calibri",Font.BOLD,18));
add(lblNewLabel,gbc);
gbc.gridy++;
JLabel lblNewLabel_1 = new JLabel("LOGIN AS");
lblNewLabel_1.setForeground(Color.WHITE);
lblNewLabel_1.setFont(new Font("Calibri",16));
add(lblNewLabel_1,gbc);
ButtonListener listener = new ButtonListener(frame,model);
gbc.gridy++;
JButton btnAdmin = new JButton("ADMIN");
btnAdmin.addActionListener(listener);
btnAdmin.addMouseListener(new ColorListener(btnAdmin));
btnAdmin.setForeground(Color.BLACK);
btnAdmin.setBackground(Color.WHITE);
btnAdmin.setBorderPainted(false);
add(btnAdmin,gbc);
gbc.gridy++;
JButton btnStaff = new JButton("STAFF");
btnStaff.addActionListener(listener);
btnStaff.addMouseListener(new ColorListener(btnStaff));
btnStaff.setForeground(Color.BLACK);
btnStaff.setBackground(Color.WHITE);
btnStaff.setBorderPainted(false);
add(btnStaff,gbc);
}
}
public class ColorListener extends MouseAdapter {
private JButton button;
public ColorListener(JButton button) {
this.button = button;
}
@Override
public void mouseEntered(MouseEvent evt) {
button.setBackground(Color.GREEN);
}
@Override
public void mouseExited(MouseEvent evt) {
button.setBackground(Color.WHITE);
}
}
public class ButtonListener implements ActionListener {
private Covid19GUI frame;
private Covid19Model model;
public ButtonListener(Covid19GUI frame,Covid19Model model) {
this.frame = frame;
this.model = model;
}
@Override
public void actionPerformed(ActionEvent event) {
JButton button = (JButton) event.getSource();
if (button.getText().equals("ADMIN")) {
model.setAdmin(true);
} else {
model.setAdmin(false);
}
JPanel panel = frame.getCardLayoutPanel();
CardLayout layout = (CardLayout) panel.getLayout();
layout.show(panel,"t2");
}
}
public class LoginPanel extends JPanel {
private static final long serialVersionUID = 1L;
private Covid19GUI frame;
private Covid19Model model;
private JTextField txt_uname;
private JTextField txt_pass;
/**
* Create the panel.
*/
public LoginPanel(Covid19GUI frame,Covid19Model model) {
this.frame = frame;
this.model = model;
setBackground(Color.BLACK);
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.anchor = GridBagConstraints.LINE_START;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.insets = new Insets(5,5);
gbc.gridwidth = 2;
gbc.gridx = 0;
gbc.gridy = 0;
JLabel lblNewLabel = new JLabel("COVID'19 Management System");
lblNewLabel.setForeground(Color.WHITE);
lblNewLabel.setFont(new Font("Calibri",gbc);
gbc.gridy++;
JLabel lblNewLabel_1 = new JLabel("LOGIN PAGE");
lblNewLabel_1.setForeground(Color.WHITE);
lblNewLabel_1.setFont(new Font("Calibri",gbc);
gbc.gridwidth = 1;
gbc.gridy++;
JLabel lblNewLabel_2 = new JLabel("Username");
lblNewLabel_2.setFont(new Font("Calibri",14));
lblNewLabel_2.setForeground(Color.WHITE);
add(lblNewLabel_2,gbc);
gbc.gridx++;
txt_uname = new JTextField();
txt_uname.setColumns(10);
add(txt_uname,gbc);
gbc.gridx = 0;
gbc.gridy++;
JLabel lblNewLabel_2_1 = new JLabel("Password");
lblNewLabel_2_1.setForeground(Color.WHITE);
lblNewLabel_2_1.setFont(new Font("Calibri",14));
add(lblNewLabel_2_1,gbc);
gbc.gridx++;
txt_pass = new JTextField();
txt_pass.setColumns(10);
add(txt_pass,gbc);
gbc.gridwidth = 2;
gbc.gridx = 0;
gbc.gridy++;
JButton btn_login = new JButton("Login");
add(btn_login,gbc);
}
public String getUserName() {
return txt_uname.getText().trim();
}
public String getPassword() {
return txt_pass.getText().trim();
}
}
public class Covid19Model {
private boolean isAdmin;
private String userName;
private String password;
public boolean isAdmin() {
return isAdmin;
}
public void setAdmin(boolean isAdmin) {
this.isAdmin = isAdmin;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
}