java代码未以正确的大小导出缓冲的图像

Question

我下面的Java代码的目标是以400 X 400格式导出图像。现在，代码确实导出了图像。但是，它以原始大小导出图像。我不知道为什么它不能以所需的格式导出。没有错误。目标只是一些如何获得线

BufferedImage scaledButtonImage =新的BufferedImage（400，400，bimg.getType（））;

以它的方式工作。

    import java.awt.BorderLayout;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;


public class ren {
    Frame f;  
      JLabel b2=new JLabel("");;  

    ren() throws IOException{ 

        f=new JFrame();  
        b2.setIcon(new ImageIcon("/Users/johnzalubski/Desktop/dropIn/Complete-Audi-Buying-Guide-gear-patrol-lead-full.jpg"));

        JButton b3 = new JButton("Exported");


        File file = new File("aa.png");



        f.add(b2,BorderLayout.CENTER);  
        f.add(b3,BorderLayout.SOUTH); 


        f.setSize(400,500);  
        f.setVisible(true);  



        b3.addActionListener(new ActionListener() {



            public void actionPerformed(ActionEvent e) {

                Icon ico = b2.getIcon();
                // Create a buffered image
                BufferedImage bimg = new BufferedImage(ico.getIconWidth(), ico.getIconHeight(),
                                                       BufferedImage.TYPE_INT_RGB);
                // Create the graphics context
                Graphics g = bimg.createGraphics();
                // Now paint the icon
                ico.paintIcon(null, g, 0, 0);
                g.dispose();


        BufferedImage scaledButtonImage =
            new BufferedImage(400, 400, bimg.getType());
                Graphics g1 = scaledButtonImage.createGraphics();
            g1.drawImage(scaledButtonImage, 0, 0, 400, 400, null);
//                  
            g1.dispose();


                    b2.setIcon(new ImageIcon(bimg));

                try {
                    ImageIO.write(bimg, "png",file);

                } catch (IOException e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                }
            }
        });
    }  

        public static void main(String[] args) throws IOException {  
        new ren();  



        }  

}

Answer 1

如果要在bimg中创建scaledButtonImage的缩放版本，则此行：