Swing 弹窗显示图片

package com.test.ggg.ui;

import lombok.extern.slf4j.Slf4j;

import javax.swing.*;
import java.awt.*;
import java.io.File;

@Slf4j
public class QrCodeImgDialog extends JDialog
{
    public QrCodeImgDialog( String title, JFrame parent, String imgPath )
    {
        super( parent, "", ModalityType.DOCUMENT_MODAL );
        setTitle( title );

        if( imgPath.isEmpty() )
        {
            log.error( "QrCodeImgDialog: Image path is empty!" );
            return;
        }

        File file = new File( imgPath );
        if( !file.exists() )
        {
            log.error( "QrCodeImgDialog: given image file not exist!" );
            return;
        }

        //load image
        ImageIcon imageIcon = new ImageIcon( imgPath );
        imageIcon = new ImageIcon( imageIcon.getImage().getScaledInstance( 500, 500, Image.SCALE_DEFAULT )); //缩放

        JLabel labelImg = new JLabel( imageIcon );
        this.getContentPane().add( labelImg, BorderLayout.CENTER );

        this.setSize( 700, 700 );
        this.setLocation( 300, 20 );
        this.setResizable( false );
    }

    public void showDialog()
    {
        this.setVisible( true );
    }
}