根据上面的代码,为什么窗口只显示了背景图片,没有登陆注册面板
时间: 2024-03-10 08:48:04 浏览: 24
看了一下代码,可能是因为没有设置 Loginreg 面板的布局管理器,导致面板中的组件无法显示。可以在 Loginreg 类的构造方法中添加以下代码,设置面板的布局管理器为 FlowLayout:
```java
public Loginreg() {
setLayout(new FlowLayout());
JLabel label1 = new JLabel("用户名:");
JTextField textField1 = new JTextField(20);
JLabel label2 = new JLabel("密码:");
JTextField textField2 = new JTextField(20);
JButton loginButton = new JButton("登录");
JButton registerButton = new JButton("注册");
add(label1);
add(textField1);
add(label2);
add(textField2);
add(loginButton);
add(registerButton);
}
```
这样,登录注册面板中的组件就可以正常显示了。
相关问题
java 登陆面板添加一张图片作为整个界面的背景代码
你可以使用 Java Swing 中的 JLabel 组件来显示图片,并将其作为登录面板的背景。以下是一个简单的示例代码:
```java
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class LoginPanel extends JPanel {
private Image backgroundImg; // 背景图片
public LoginPanel() {
// 加载背景图片
ImageIcon icon = new ImageIcon("background.jpg");
backgroundImg = icon.getImage();
// 设置面板布局为 null,方便自定义组件位置
setLayout(null);
// 创建登录表单组件,添加到面板中
// ...
// 创建图片标签组件,添加到面板中,并设置为背景
JLabel bgLabel = new JLabel() {
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(backgroundImg, 0, 0, null);
}
};
bgLabel.setPreferredSize(new Dimension(400, 300)); // 设置图片大小
add(bgLabel);
}
public static void main(String[] args) {
// 创建 JFrame 窗口并设置属性
JFrame frame = new JFrame("Login Panel");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 300);
frame.setLocationRelativeTo(null); // 居中显示
// 创建登录面板并添加到窗口中
LoginPanel loginPanel = new LoginPanel();
frame.getContentPane().add(loginPanel);
// 显示窗口
frame.setVisible(true);
}
}
```
注意,这里的背景图片路径需要根据实际情况修改。
再在上面的窗口里面,放一个登录注册面板,用代码呈现
好的,下面是在GameWin类中添加一个登录注册面板的代码:
```
package xjdz;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class GameWin extends JFrame {
private static final int WIDTH = 999;
private static final int HEIGHT = 666;
private static final String TITLE = "oqcw星际大战仿飞机大战小游戏";
private static final String BG_IMAGE_PATH = "src/bg.jpg";
private JTextField usernameField;
private JPasswordField passwordField;
public GameWin() {
initWindow();
initLoginPanel();
}
private void initWindow() {
// 设置窗口大小、位置、标题、背景等属性
this.setSize(WIDTH, HEIGHT);
this.setLocationRelativeTo(null);
this.setTitle(TITLE);
this.setResizable(false);
this.setContentPane(createBackgroundPanel());
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
super.windowClosing(e);
dispose();
}
});
}
private JPanel createBackgroundPanel() {
JPanel bgPanel = new JPanel() {
protected void paintComponent(Graphics g) {
super.paintComponent(g);
ImageIcon icon = new ImageIcon(BG_IMAGE_PATH);
Image img = icon.getImage();
g.drawImage(img, 0, 0, getWidth(), getHeight(), icon.getImageObserver());
}
};
bgPanel.setLayout(null);
bgPanel.setPreferredSize(new Dimension(WIDTH, HEIGHT));
return bgPanel;
}
private void initLoginPanel() {
JPanel loginPanel = new JPanel();
loginPanel.setLayout(new BoxLayout(loginPanel, BoxLayout.Y_AXIS));
loginPanel.setOpaque(false);
JLabel title = new JLabel("请登录");
title.setAlignmentX(Component.CENTER_ALIGNMENT);
title.setFont(new Font("宋体", Font.BOLD, 24));
title.setBorder(BorderFactory.createEmptyBorder(30, 0, 30, 0));
loginPanel.add(title);
JPanel usernamePanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
JLabel usernameLabel = new JLabel("用户名:");
usernameField = new JTextField(20);
usernamePanel.add(usernameLabel);
usernamePanel.add(usernameField);
loginPanel.add(usernamePanel);
JPanel passwordPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
JLabel passwordLabel = new JLabel("密 码:");
passwordField = new JPasswordField(20);
passwordPanel.add(passwordLabel);
passwordPanel.add(passwordField);
loginPanel.add(passwordPanel);
JButton loginButton = new JButton("登录");
loginButton.setAlignmentX(Component.CENTER_ALIGNMENT);
loginButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO: 处理登录逻辑
}
});
loginPanel.add(loginButton);
JButton registerButton = new JButton("注册");
registerButton.setAlignmentX(Component.CENTER_ALIGNMENT);
registerButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO: 处理注册逻辑
}
});
loginPanel.add(registerButton);
JPanel wrapper = new JPanel(new GridBagLayout());
wrapper.setOpaque(false);
wrapper.add(loginPanel);
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 1;
gbc.weighty = 1;
getContentPane().add(wrapper, gbc);
}
public void start() {
this.setVisible(true);
}
public static void main(String[] args) {
GameWin gameWin = new GameWin();
gameWin.start();
}
}
```
在这段代码中,我们添加了一个initLoginPanel方法,用于初始化登录注册面板。该面板使用了BoxLayout和GridBagLayout来进行布局,并且使用了JLabel、JTextField、JPasswordField、JButton等Swing组件来呈现。同时,我们还为登录、注册按钮添加了ActionListener,以处理具体的登录、注册逻辑。最后,我们将登录注册面板添加到了窗口的content pane中,以便在窗口中显示。