直到昨天我的JFrame工作得很好，今天我做了一点编辑，但它不再工作了。我试图删除所有未与我的JFrame严格绑定的代码，但它仍然拒绝显示任何内容，我会在此处粘贴我的代码
这是我的主要文件
public class ImageEditor extends JFrame{
JFrame mainFrame = new JFrame("ImageEditor");
JMenuBar menu = new JMenuBar();
JMenu fileMenu = new JMenu("File");
JMenu editMenu = new JMenu("Edit");
JMenuItem openButton = new JMenuItem("Open...");
JMenuItem saveButton = new JMenuItem("Save");
JMenuItem saveAsButton = new JMenuItem("Save as...");
JMenuItem exitButton = new JMenuItem("Exit");
JMenuItem rotatePositive = new JMenuItem("Rotate 45°");
JMenuItem rotateNegative = new JMenuItem("Rotate -45°");
JMenuItem resizeButton = new JMenuItem("Resize");
JMenuItem adjustBrightnessButton = new JMenuItem("Adjust brightness");
JMenuItem insertLabel = new JMenuItem("Add text...");
JFileChooser fileChooser;
JFileChooser fileSaver;
JSlider brightnessSlider = new JSlider(0, 200, 100);
ImagePanel photoViewer = new ImagePanel();
public ImageEditor() {
editMenu.setEnabled(false);
mainFrame.setSize(1000,750);
mainFrame.setResizable(true);
photoViewer.setSize(1000,750);
openButton.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, ActionEvent.CTRL_MASK));
openButton.addActionListener((java.awt.event.ActionEvent evt) -> {
fileChooser = new JFileChooser(FileSystemView.getFileSystemView().getHomeDirectory());
fileChooser.setVisible(true);
int returnValue = fileChooser.showOpenDialog(null);
if (returnValue == JFileChooser.APPROVE_OPTION) {
editMenu.setEnabled(true);
fileChooser.setVisible(false);
File[] selectedImages = fileChooser.getSelectedFiles();
photoViewer.updateGraphics(selectedImages);
photoViewer.repaint();
}
});
exitButton.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, ActionEvent.CTRL_MASK));
exitButton.addActionListener((java.awt.event.ActionEvent evt) -> {
System.exit(0);
});
saveButton.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, ActionEvent.CTRL_MASK));
saveButton.addActionListener((java.awt.event.ActionEvent evt) -> {
fileSaver = new JFileChooser(FileSystemView.getFileSystemView().getHomeDirectory());
fileSaver.setVisible(true);
fileSaver.setMultiSelectionEnabled(false);
int returnValue = fileSaver.showOpenDialog(null);
if (returnValue == JFileChooser.APPROVE_OPTION){
String path = fileSaver.getSelectedFile().getAbsolutePath();
System.err.println(path);
}
});
rotatePositive.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, ActionEvent.CTRL_MASK));
rotatePositive.addActionListener((java.awt.event.ActionEvent evt) -> {
photoViewer.positiveRotation();
});
rotateNegative.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, ActionEvent.CTRL_MASK));
rotateNegative.addActionListener((java.awt.event.ActionEvent evt) -> {
photoViewer.negativeRotation();
});
insertLabel.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, ActionEvent.CTRL_MASK));
insertLabel.addActionListener((java.awt.event.ActionEvent evt) -> {
JFrame adder = new JFrame("Add text");
adder.setVisible(true);
adder.setAlwaysOnTop(true);
adder.setBounds(500, 250, 250, 125);
adder.setLayout(new GridLayout(2,2));
JLabel labelText = new JLabel("Text: ");
JTextField label = new JTextField();
JButton cancelButton = new JButton("Cancel");
JButton confirmButton = new JButton("OK");
adder.add(labelText);
adder.add(label);
adder.add(cancelButton);
adder.add(confirmButton);
confirmButton.addActionListener((java.awt.event.ActionEvent evt2) -> {
adder.setVisible(false);
mainFrame.addMouseListener(new MouseListener() {
@Override
public void mouseClicked(MouseEvent e) {
photoViewer.label=label.getText();
photoViewer.lx=e.getX();
photoViewer.ly=e.getY();
photoViewer.repaint();
}
@Override
public void mousePressed(MouseEvent e) {
//throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
@Override
public void mouseReleased(MouseEvent e) {
//throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
@Override
public void mouseEntered(MouseEvent e) {
//throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
@Override
public void mouseExited(MouseEvent e) {
//throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
});
});
});
resizeButton.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, ActionEvent.CTRL_MASK));
resizeButton.addActionListener((java.awt.event.ActionEvent evt) -> {
JFrame resizer = new JFrame("Resize");
resizer.setVisible(true);
resizer.setAlwaysOnTop(true);
resizer.setBounds(500, 250, 250, 125);
resizer.setLayout(new GridLayout(3,2));
JLabel widthLabel = new JLabel("Width: ");
JLabel heightLabel = new JLabel("Height: ");
JFormattedTextField widthField = new JFormattedTextField();
JFormattedTextField heightField = new JFormattedTextField();
JButton cancelButton = new JButton("Cancel");
JButton confirmButton = new JButton("OK");
widthField.setFormatterFactory(new DefaultFormatterFactory(new NumberFormatter(java.text.NumberFormat.getIntegerInstance())));
heightField.setFormatterFactory(new DefaultFormatterFactory(new NumberFormatter(java.text.NumberFormat.getIntegerInstance())));
resizer.add(widthLabel);
resizer.add(widthField);
resizer.add(heightLabel);
resizer.add(heightField);
resizer.add(cancelButton);
resizer.add(confirmButton);
cancelButton.addActionListener((java.awt.event.ActionEvent evt2) -> {resizer.setVisible(false);});
confirmButton.addActionListener((java.awt.event.ActionEvent evt2) -> {photoViewer.selectedImg = photoViewer.resize(photoViewer.selectedImg, Integer.parseInt(widthField.getText().replace(".", "")), Integer.parseInt(heightField.getText().replace(".", "")));}); //WORKING
});
adjustBrightnessButton.setEnabled(false);
//adjustBrightnessButton.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, ActionEvent.CTRL_MASK));
/*adjustBrightnessButton.addActionListener((java.awt.event.ActionEvent evt) -> {
JFrame slider = new JFrame("Brightness");
slider.setSize(300,100);
slider.setAlwaysOnTop(true);
slider.add(brightnessSlider);
slider.setVisible(true);
brightnessSlider.addMouseListener(new MouseListener(){
@Override
public void mouseClicked(MouseEvent e){}
@Override
public void mousePressed(MouseEvent e){}
@Override
public void mouseReleased(MouseEvent e) {
photoViewer.adjustBrightness(Float.valueOf((brightnessSlider.getValue()))/100); //Less memory usage
}
@Override
public void mouseEntered(MouseEvent e){}
@Override
public void mouseExited(MouseEvent e) {}
});
brightnessSlider.addChangeListener((ChangeEvent e) -> {
photoViewer.adjustBrightness(Float.valueOf((brightnessSlider.getValue()))/100); //Real time update, but VERY HEAVY
});
});*/
menu.add(fileMenu);
menu.add(editMenu);
fileMenu.add(openButton);
fileMenu.add(saveButton);
fileMenu.add(saveAsButton);
fileMenu.add(exitButton);
editMenu.add(resizeButton);
editMenu.add(rotatePositive);
editMenu.add(rotateNegative);
editMenu.add(adjustBrightnessButton);
editMenu.add(insertLabel);
menu.setVisible(true);
mainFrame.setJMenuBar(menu);
mainFrame.setVisible(true);
mainFrame.add(photoViewer);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
ImageEditor img = new ImageEditor();
}
}
这是我的第二个文件，即photoViewer
public class ImagePanel extends JPanel{
public ArrayList<File> selectedFiles = new ArrayList<>();
BufferedImage selectedImg;
public int rotation = 0;
boolean flag=true;
String label="";
int lx,ly;
@Override
public void paintComponent(Graphics g){
super.paintComponent(g);
AffineTransform at = new AffineTransform();
at.translate(getWidth() / 2, getHeight() / 2);
at.rotate(Math.toRadians(45*rotation));
if(flag && !selectedFiles.isEmpty()){
selectedImg = loadImage(selectedFiles.get(0)); //WORKING
flag = false;
}
if(!selectedFiles.isEmpty())
at.translate(-selectedImg.getWidth() / 2, -selectedImg.getHeight() / 2);
Graphics2D g2d = (Graphics2D) g;
if(!label.isEmpty()){
System.err.println("PHOTODONE");
g2d.drawString("vdsavdfvdfsvfdsvdfs", 0, 0); //PROVARE A UTILIZZARE JFRAME.CREATEIMAGE PER COPIARE L'IMMAGINE E SCRIVERE SU QUELLA
label="";
repaint();
}
g2d.drawImage(selectedImg, at, null);
}
public BufferedImage loadImage(File fileName){
BufferedImage bfImg = null;
try{
bfImg = ImageIO.read(fileName);
if(bfImg.getWidth() > 800)
bfImg = resize(bfImg, 800, bfImg.getHeight());
if(bfImg.getHeight() > 750)
bfImg = resize(bfImg, bfImg.getWidth(), 750);
}
catch(IOException e){
System.err.println("Error loading image");
}
return bfImg;
}
public void updateGraphics(File[] files){
selectedFiles = new ArrayList<>(Arrays.asList(files));
}
public void positiveRotation(){
if(rotation < 8){
rotation++;
repaint();
} //BOTH WORKING
else{
rotation=1;
repaint();
}
}
public void negativeRotation(){
if(rotation > -8){
rotation--;
repaint();
}
else{
rotation=-1;
repaint();
}
}
/*public void adjustBrightness(Float sliderValue){
RescaleOp rop = new RescaleOp(sliderValue, 0, null);
rop.filter(selectedImg, selectedImg); //WORKING
repaint();
}*/
public BufferedImage resize(BufferedImage img, int width, int height) {
Image tmp = img.getScaledInstance(width, height, Image.SCALE_SMOOTH);
BufferedImage dimg = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = dimg.createGraphics();
g2d.drawImage(tmp, 0, 0, null);
g2d.dispose();
return dimg;
}
}
我今天所做的编辑改变了主文件中的一些内容（以及来自photoViewer，因为它们已被绑定）
我改变了这个
selectedImages=fileChooser.getSelectedFile().getAbsolutePath()
photoViewer.updateGraphics(selectedImages);
到此
File[] selectedImages = fileChooser.getSelectedFiles();
photoViewer.updateGraphics(selectedImages);
然后我修改了两个文件，以确保函数将接受一个FIle数组，但如果我删除所有不相关的代码，注释photoViewer调用，注释所有的photoViewer文件，它仍然无法工作。发生了什么事？
ADDON
我想出了如何让NetBeans显示堆栈跟踪，这里是
java.lang.NullPointerException
at javax.swing.plaf.basic.BasicScrollPaneUI$Handler.mouseWheelMoved(BasicScrollPaneUI.java:866)
at org.netbeans.modules.editor.lib2.view.DocumentViewOp.mouseWheelMoved(DocumentViewOp.java:1523)
at org.netbeans.modules.editor.lib2.view.DocumentViewOp$MouseWheelDelegator.mouseWheelMoved(DocumentViewOp.java:1657)
at java.awt.AWTEventMulticaster.mouseWheelMoved(AWTEventMulticaster.java:532)
at java.awt.Component.processMouseWheelEvent(Component.java:6623)
at java.awt.Component.processEvent(Component.java:6307)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4891)
at java.awt.Container.dispatchEventToSelf(Container.java:2318)
at java.awt.Component.dispatchMouseWheelToAncestor(Component.java:5044)
at java.awt.Component.dispatchEventImpl(Component.java:4778)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4554)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2750)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
[catch] at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)