我的问题是如何将图像显示到JPanel中?我对如何做到这一点不清楚。
我在具有图像文件我的项目文件夹的目录Project Folder/GUI/img
,特别是gray.png
和green.png
我想在一个JPanel显示。
我尝试使用以下代码,ImageIcon
并JLabel
在其他帖子中找到了以下代码:
ImageIcon image = new ImageIcon("GUI/img/gray.png");
JLabel label = new JLabel(image);
//JPanel panel is already initialized by the IDE
panel.add(label)
但是不起作用...JPanel
保持空白而不显示任何图像。我怎样才能做到这一点?
除此之外,我希望在执行某些操作(例如,按下按钮)时JPanel
更改(gray.png
for green.png
)内部的图像。我可以通过相同的方法将其存档,以便在JPanel
右侧显示图像?
提前致谢!
编辑:这是获得此测试代码的示例。初始化由IDE自动完成。
import java.awt.Image;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
public class Sample extends javax.swing.JFrame {
public Sample() {
initComponents();
}
//Initialization
private void initComponents() {
PanelImage = new javax.swing.JPanel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowOpened(java.awt.event.WindowEvent evt) {
formWindowOpened(evt);
}
});
javax.swing.GroupLayout PanelImageLayout = new javax.swing.GroupLayout(PanelImage);
PanelImage.setLayout(PanelImageLayout);
PanelImageLayout.setHorizontalGroup(
PanelImageLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 100, Short.MAX_VALUE)
);
PanelImageLayout.setVerticalGroup(
PanelImageLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 100, Short.MAX_VALUE)
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(61, 61, 61)
.addComponent(PanelImage, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(239, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(45, 45, 45)
.addComponent(PanelImage, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(155, Short.MAX_VALUE))
);
pack();
}
private void formWindowOpened(java.awt.event.WindowEvent evt) {
try {
DisplayImage(PanelImage, "/GUI/img/gray.png");
} catch (Exception ex) {
Logger.getLogger(Sample.class.getName()).log(Level.SEVERE, null, ex);
}
}
//For display the url image in a JPanel
private void DisplayImage(JPanel jp, String url) throws IOException, Exception {
try {
Image image=ImageIO.read(this.getClass().getResource(url));
ImageIcon imageicon=new ImageIcon(image);
JLabel label=new JLabel(imageicon);
jp.add(label);
} catch (IOException ex) {
throw new IOException();
} catch (Exception ex) {
throw new Exception();
}
}
public static void main(String args[]) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Sample.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Sample().setVisible(true);
}
});
}
// Variables declaration
private javax.swing.JPanel PanelImage;
}
该private void DisplayImage(JPanel jp, String url)
是我需要为显示图像的工作,从URLString url
中JPanel jp
在Google中寻找代码段,我得到了一个解决方案……并使用了以前的注释所引用的相同模式。给我解决方案的代码是:
label.setIcon(new javax.swing.ImageIcon(getClass().getResource("/resources/gray.png")))
这样,我便制成了要实现的方法:
private static void DisplayImage(JPanel jp, String url) {
JLabel jl=new JLabel();
jl.setIcon(new javax.swing.ImageIcon(getClass().getResource(url)));
jp.add(jl);
}
也许这不是完美且最正确的解决方案,但对我而言却完美,这就是我想要的。
感谢所有的答案和建议!
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