Question

如何使用动态文本在标签框中设置背景图像。

例如：

JLabel label = new JLabel();
label.setIcon("/image/image.png");
label.setText("Text1");

此代码不起作用，因为文本未显示在图像的中心。

Answer 1

这很容易。

import javax.swing.*;


public class YourFrame extends JFrame {

  private ImageIcon icon;
  private JLabel label;


  public YourFrame(){

    icon = new ImageIcon("/image/image.png");

    label= new JLabel() {
      public void paintComponent(Graphics g) {
        g.drawImage(icon.getImage(), 0, 0, null);
        super.paintComponent(g);
      }
    };

    label.setOpaque(false);
    getContentPane().add( label );

    label.setText("Text1");

  }

  public static void main(String[] args) {
    YourFrame frame = new YourFrame();

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }
}

Answer 2

您尚未定义如何根据图像绘制文本。以下是4种不涉及自定义绘画的方法：

import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;

public class LabelImageText extends JPanel
{
    public LabelImageText()
    {
        JLabel label1 = new JLabel( new ColorIcon(Color.ORANGE, 100, 100) );
        label1.setText( "Easy Way" );
        label1.setHorizontalTextPosition(JLabel.CENTER);
        label1.setVerticalTextPosition(JLabel.CENTER);
        add( label1 );

        //

        JLabel label2 = new JLabel( new ColorIcon(Color.YELLOW, 200, 150) );
        label2.setLayout( new BoxLayout(label2, BoxLayout.Y_AXIS) );
        add( label2 );

        JLabel text = new JLabel( "More Control" );
        text.setAlignmentX(JLabel.CENTER_ALIGNMENT);
        label2.add( Box.createVerticalGlue() );
        label2.add( text );
        label2.add( Box.createVerticalStrut(10) );

        //

        JLabel label3 = new JLabel( new ColorIcon(Color.GREEN, 200, 150) );
        add( label3 );

        JLabel text3 = new JLabel();
        text3.setText("<html><center>Text<br>over<br>Image<center></html>");
        text3.setLocation(20, 20);
        text3.setSize(text3.getPreferredSize());
        label3.add( text3 );

        //

        JLabel label4 = new JLabel( new ColorIcon(Color.CYAN, 200, 150) );
        add( label4 );

        JTextPane textPane = new JTextPane();
        textPane.setText("Add some text that will wrap at your preferred width");
        textPane.setEditable( false );
        textPane.setOpaque(false);
        SimpleAttributeSet center = new SimpleAttributeSet();
        StyleConstants.setAlignment(center, StyleConstants.ALIGN_CENTER);
        StyledDocument doc = textPane.getStyledDocument();
        doc.setParagraphAttributes(0, doc.getLength(), center, false);
        textPane.setBounds(20, 20, 75, 100);
        label4.add( textPane );
    }

    public static class ColorIcon implements Icon
    {
        private Color color;
        private int width;
        private int height;

        public ColorIcon(Color color, int width, int height)
        {
            this.color = color;
            this.width = width;
            this.height = height;
        }

        public int getIconWidth()
        {
            return width;
        }

        public int getIconHeight()
        {
            return height;
        }

        public void paintIcon(Component c, Graphics g, int x, int y)
        {
            g.setColor(color);
            g.fillRect(x, y, width, height);
        }
    }

    private static void createAndShowUI()
    {
        JFrame frame = new JFrame("LabelImageText");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add( new LabelImageText() );
        frame.pack();
        frame.setLocationRelativeTo( null );
        frame.setVisible( true );
    }

    public static void main(String[] args)
    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowUI();
            }
        });
    }
}

Answer 3

有几种选择。例如，您可以将JLabel放在另一个JLabel的顶部（尽管首先让容器JLabel成为可行的布局管理器），或者您可以直接在JLabel的paintComponent方法中绘制图像。如果您执行后者，请确保JLabel设置为不透明。

Answer 4

使用此代码

label.setIcon(new ImageIcon("background.png"));
label.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
label.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);

使用此图标将居中对齐为background to JLabel

在动态文本的Jlabel（标签）框中设置背景图像

4 个答案: