java - 从图像路径保存图像

Question

我使用 JFileChooser 实现了此代码来浏览图像，但问题是我无法实现在本地磁盘上保存图像的代码。或者如果可能的话，我想直接在新的 JFrame 类中显示该图像，这将是一个动态链接

private void btnBrowseVideo1ActionPerformed(java.awt.event.ActionEvent evt) {

    // TODO add your handling code here:
    JFileChooser fileChooser = new JFileChooser();
    fileChooser.showOpenDialog(null);
    mediaUrl = null;
    String path = "";

    path = fileChooser.getSelectedFile().toString();
    path = path.trim();

    // System.out.println("URI : "+mediaUrl);
    if (path.endsWith(".jpg") || path.endsWith(".JPG")) {

        lblBrowseImage.setText(path);
    } else {
        JOptionPane.showMessageDialog(this, "SELECT .jpg  FILE!!!!");
    }

}

Answer 1

我希望我对这个问题的解释是正确的。看ImageIO用于加载和保存图像的 read() 和 write() 方法。另请参阅Working with Images和 How to Use Labels教程以获取更多详细信息和示例。

为了简单起见，下面是一个在标准对话框中显示用户选择的图像的示例:

import java.awt.BorderLayout;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.filechooser.FileNameExtensionFilter;

public class ShowImage {
    private static void createAndShowUI() {
        final JFrame frame = new JFrame("Load Image");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JButton loadButton = new JButton("Display Image");
        loadButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                JFileChooser fc = new JFileChooser(
                        System.getProperty("user.home"));
            fc.addChoosableFileFilter(new FileNameExtensionFilter(
                    "Image files", new String[] { "png", "jpg", "jpeg",
                            "gif" }));
                if (fc.showOpenDialog(null) == JFileChooser.APPROVE_OPTION){
                    try {
                        Image image = ImageIO.read(fc.getSelectedFile());
                        if (image != null) {
                            JPanel panel = new JPanel(new BorderLayout(10, 10));
                            panel.add(new JLabel(fc.getSelectedFile().toString()), 
                                    BorderLayout.NORTH);
                            panel.add(new JLabel(new ImageIcon(image)));
                            JOptionPane.showMessageDialog(frame,  panel);
                        }
                    } catch (IOException ex) {
                        ex.printStackTrace();
                    }
                }
            }
        });

        frame.add(loadButton);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                try {
                    UIManager.setLookAndFeel(
                            UIManager.getSystemLookAndFeelClassName());
                } catch (Exception ex) {
                    ex.printStackTrace();
                } 
                createAndShowUI();
            }
        });
    }
}