Java GUI JLabel 和 JPanel 图片和组件重叠问题

最新推荐文章于 2025-07-23 14:33:02 发布

原创最新推荐文章于 2025-07-23 14:33:02 发布 · 3.9k 阅读

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#java #login #integer #image #string #class

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本文探讨了一个使用Java Swing框架创建简单登录界面时遇到的问题：背景图片无法正常显示。作者详细展示了代码实现过程，并提出了疑问。

package ui;

import java.awt.AWTEvent;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

public class MainUi extends JPanel implements ActionListener
{
protected JTextField id, psw;
protected JButton ok, register, exit;
protected JLabel idl, pswl, imgl;
protected static JLabel imgpanel;
protected ImageIcon image;

public MainUi()
{
  enableEvents(AWTEvent.WINDOW_EVENT_MASK);
  image = new ImageIcon("D://java/PZ/image/bg.jpg");
  imgpanel = new JLabel(image);

  id = new JTextField(60);
  id.setActionCommand("ID");
  idl = new JLabel("ID :");
  idl.setLabelFor(id);

psw = new JTextField(60);
psw.setActionCommand("password");

pswl = new JLabel("PassWord: ");
pswl.setLabelFor(psw);

  ok = new JButton("OK");
  register = new JButton("REGISTER");
  exit = new JButton("EXIT");

  JPanel login = new JPanel();
  GridBagLayout gridbag = new GridBagLayout();
  GridBagConstraints c = new GridBagConstraints();
  login.setLayout(gridbag);

// imgl.setBounds(0, 0, imgIcon.getIconWidth(), imgIcon.getIconHeight());
// login.setOpaque(false);

  JLabel[] labels = { idl, pswl };
  JTextField[] textFields = { id, psw };
  addLabelTextRows(labels, textFields, gridbag, login);

  c.gridwidth = GridBagConstraints.REMAINDER; // last
  c.anchor = GridBagConstraints.WEST;
  c.weightx = 1.0;

  login.setBorder(BorderFactory.createCompoundBorder(BorderFactory
    .createTitledBorder("Text Fields"), BorderFactory
    .createEmptyBorder(5, 5, 5, 5)));

add(login, BorderLayout.CENTER);

}

private void addLabelTextRows(JLabel[] labels, JTextField[] textFields,
   GridBagLayout gridbag, Container container)
{
  GridBagConstraints c = new GridBagConstraints();
  c.anchor = GridBagConstraints.EAST;
  int numLabels = labels.length;

  for (int i = 0; i < numLabels; i++)
  {
   c.gridwidth = GridBagConstraints.RELATIVE; // next-to-last
   c.fill = GridBagConstraints.NONE; // reset to defau
   container.add(labels[i], c);

   c.gridwidth = GridBagConstraints.REMAINDER; // end row
   c.fill = GridBagConstraints.HORIZONTAL;
   c.weightx = 1.0;
   container.add(textFields[i], c);
  }

}

@Override
public void actionPerformed(ActionEvent arg0)
{

}

public static void createGUI()
{
  JFrame frame = new JFrame("Plants and Zombies");
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

  frame.add(new MainUi());
  //frame.getContentPane().add(imgpanel);
  frame.getLayeredPane().add(imgpanel, new Integer(Integer.MIN_VALUE));

  frame.pack();

  frame.setSize(800, 600);
  frame.setVisible(true);
}

public static void main(String[] args)
{
  SwingUtilities.invokeLater(new Runnable()
  {
   public void run()
   {
    UIManager.put("swing.boldMetal", Boolean.FALSE);
    createGUI();
   }
  });
}
}
这里为什么图片不能显示？？？？？？

有知道的高手回答下。。谢谢