java—我无法通过jfilechooser加载图形并实际显示它

xkftehaa  于 2021-06-30  发布在  Java
关注(0)|答案(1)|浏览(417)

所以，我有一个继承自jframe的类，它有两个jsplitpane和一个菜单栏。一个jsplitpane在顶部有一个jsplitpane，在底部有一个textarea，另一个jsplitpane左右各有两个jpanel。我想解析一个通过jfilechooser选择的pnml文件（或者更多，但我现在只是想让一个工作）。我可以选择一个文件，并通过打印文件名对其进行测试，这是可行的，但我无法在左侧jpanel中实际显示图形。也许有人能帮我。这是我的课：

  1. import pnml_parsing.Parser;
  3.    import java.awt.BorderLayout;
  4.    import java.awt.event.MouseAdapter;
  5.    import java.awt.event.MouseEvent;
  6.    import java.awt.event.ActionListener;
  7.    import java.awt.event.ActionEvent;
  8.    import java.io.File;
  9.    import java.util.Arrays;
  11.    import javax.swing.JComponent;
  12.    import javax.swing.JFrame;
  13.    import javax.swing.JLabel;
  14.    import javax.swing.JPanel;
  15.    import javax.swing.JScrollPane;
  16.    import javax.swing.JSplitPane;
  17.    import javax.swing.JTextArea;
  18.    import javax.swing.JMenuBar;
  19.    import javax.swing.JToolBar;
  20.    import javax.swing.JMenu;
  21.    import javax.swing.JMenuItem;
  22.    import javax.swing.JButton;
  23.    import javax.swing.JFileChooser;
  24.    import javax.swing.filechooser.FileFilter;
  26.    import org.graphstream.ui.swingViewer.ViewPanel;
  27.    import org.graphstream.ui.view.Viewer;
  28.    import org.graphstream.ui.view.ViewerPipe;
  30.    public class Fenster_test extends JFrame {
  31.        /**default serial version ID */
  32.        private static final long serialVersionUID = 1L;
  34.        private Controller controller;
  36.        private ViewPanel viewPanel1;
  37.        private ViewPanel viewPanel2;
  39.        private JLabel statusLabel;
  41.        JTextArea textfield = new JTextArea();
  42.        JSplitPane leftRight = new JSplitPane();
  43.        JComponent bottom = new JScrollPane(textfield);
  44.        JPanel jpnlGraph = new JPanel(new BorderLayout());
  45.        JPanel resultGraph = new JPanel(new BorderLayout());
  46.        JLabel label = new JLabel();
  47.        JToolBar tbar = new JToolBar();
  48.        JMenuBar mbar = new JMenuBar();
  49.        JMenu datei = new JMenu("Datei");
  50.        JButton reset = new JButton("reset");
  51.        JButton markerplus = new JButton("+");
  52.        JButton markerminus = new JButton("-");
  53.        JButton loescheEG = new JButton("EG löschen"); 
  54.        JMenuItem dateiwahl = new JMenuItem("Datei auswählen");
  55.        JMenuItem dateienwahl = new JMenuItem("Dateien auswählen");
  56.        JFileChooser jfc = new JFileChooser();
  57.        File[] files;
  59.        final JSplitPane topBottom = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
  61.        public Fenster_test(String titel) {
  62.            super(titel);
  64.            jfc.setMultiSelectionEnabled(true);
  65.            jfc.setFileFilter(new FileFilter() {
  67.                   public String getDescription() {
  68.                       return "PNML Dateien (*.pnml)";
  69.                   }
  71.                   public boolean accept(File f) {
  72.                       if (f.isDirectory()) {
  73.                           return true;
  74.                       } else {
  75.                           String filename = f.getName().toLowerCase();
  76.                           return filename.endsWith(".pnml") || filename.endsWith(".pnml") ;
  77.                       }
  78.                   }
  79.                });
  81.            System.setProperty("org.graphstream.ui.renderer",
  82.                    "org.graphstream.ui.j2dviewer.J2DGraphRenderer");
  84.            // Erzeuge Controllers
  85.            //controller = new Controller(this);
  87.            // Layout des JFrames setzen
  88.            this.setLayout(new BorderLayout());
  90.            // Erzeuge und initialisiere ein Panel zur Anzeige des Graphen
  91.            //initPanelGraph();
  93.            // Einbetten des ViewPanels ins JPanel
  94.            //jpnlGraph = new JPanel(new BorderLayout());
  95.            //jpnlGraph.add(BorderLayout.CENTER, viewPanel1);
  97.            // Füge das JPanel zum Haupt-Frame hinzu
  98.            this.add(jpnlGraph, BorderLayout.CENTER);
  99.            mbar.add(datei);
  100.            tbar.add(loescheEG);
  101.            tbar.add(markerplus);
  102.            tbar.add(markerminus);
  103.            tbar.add(reset);
  104.            datei.add(dateiwahl);
  105.            //initPanelGraph();
  106.            controller = new Controller(jpnlGraph);
  107.            label.setText("<No Graph>");
  108.            jpnlGraph.add(label);
  109.            dateiwahl.addActionListener(new ActionListener() {
  110.                @Override
  111.                public void actionPerformed(ActionEvent e) {
  113.                    jfc.showOpenDialog(null);
  114.                    files = jfc.getSelectedFiles();
  116.                    if(files == null) {
  117.                        System.out.println("Keine Datei(en) ausgewählt");
  118.                    }else {
  120.                        Parser parser = new Parser(files[0]);
  121.                        parser.initParser(); 
  122.                        parser.parse(); //parses File
  124.                        initPanelGraph(); 
  126.                    }
  127.                    if(files.length>1) {
  128.                        Arrays.sort(files);
  129.                        //mehrere Dateien durchlaufen
  130.                        for(int i=0; i<files.length; i++) {
  131.                            System.out.println("Datei "+files[i].getPath()+"ausgewählt");
  132.                        }
  134.                    }
  135.                    jfc.setCurrentDirectory(files[0].getParentFile());
  136.                }
  137.            });
  139.            mbar.add(tbar);
  140.            this.setJMenuBar(mbar);
  141.            this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  142.            this.setBounds(200, 200, 400, 300);
  144.            topBottom.setTopComponent(leftRight);
  145.            topBottom.setBottomComponent(bottom);
  147.            leftRight.setLeftComponent(jpnlGraph);
  148.            leftRight.setRightComponent(resultGraph);
  150.            this.add(topBottom, BorderLayout.CENTER);
  151.            this.setSize(1000, 700);
  152.            this.setVisible(true);
  154.            topBottom.setDividerLocation(0.8);
  155.            leftRight.setDividerLocation(0.5);
  157.        }
  159.        private void initPanelGraph() {
  160.            Viewer viewer = new Viewer(controller.getGraph(),  //this method actually converts my own model of my pnml-File to Nodes and Edges for graphstream
  161.                    Viewer.ThreadingModel.GRAPH_IN_ANOTHER_THREAD);
  162.            viewer.disableAutoLayout();
  164.            viewPanel1 = viewer.addDefaultView(false);
  166.            ViewerPipe viewerPipe = viewer.newViewerPipe();
  168.            ClickListener clickListener = new ClickListener(controller);
  170.            viewerPipe.addViewerListener(clickListener);
  172.            viewPanel1.addMouseListener(new MouseAdapter() {
  174.                @Override
  175.                public void mousePressed(MouseEvent me) {
  176.                    System.out.println("MyFrame - mousePressed: " + me);
  177.                    viewerPipe.pump();
  178.                }
  180.                @Override
  181.                public void mouseReleased(MouseEvent me) {
  182.                    System.out.println("MyFrame - mouseReleased: " + me);
  183.                    viewerPipe.pump();
  184.                }
  185.            });
  186.        }

在我尝试使用jfilechooser和硬编码.pnml路径之前，它工作得很好。构造器看起来像这样。现在我只需要调用new fensterètest（“我的帧的名称”）；在我的main方法中，之前我也在main方法中进行解析。

  1. public Fenster_test(String titel) {
  2.         super(titel);
  4.         System.setProperty("org.graphstream.ui.renderer",
  5.                 "org.graphstream.ui.j2dviewer.J2DGraphRenderer");
  7.         controller = new Controller(this);
  9.         this.setLayout(new BorderLayout());
  11.         initPanelGraph();
  13.         jpnlGraph.add(BorderLayout.CENTER, viewPanel1);
  15.         this.add(jpnlGraph, BorderLayout.CENTER);
  17.         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  18.         this.setBounds(200, 200, 400, 300);
  20.         topBottom.setTopComponent(leftRight);
  21.         topBottom.setBottomComponent(bottom);
  23.         leftRight.setLeftComponent(jpnlGraph);
  24.         leftRight.setRightComponent(resultGraph);
  26.         this.add(topBottom, BorderLayout.CENTER);
  27.         this.setSize(1024, 720);
  28.        this.setVisible(true);
  30.         topBottom.setDividerLocation(0.8);
  31.         leftRight.setDividerLocation(0.5);
  33.     }
JavaswinggraphstreamJFileChooser

1条答案

按热度按时间
vhmi4jdf

vhmi4jdf1#

因为你没有提供一个最小的，可运行的例子，我创建了我自己的。
下面是一个简单的图像显示gui。

我创造了一个 JFrame 带着一幅画 JPanel . 创建 JFrame 是在 run 方法。图纸 JPanel 在单独的类中创建。我延伸 JPanel 因为我想覆盖 paintComponent 方法。
使用此代码可以创建一个简单的gui来显示一个医学图像。一旦你开始工作，小心地将代码添加到你的简单gui中。在添加的每一小段代码（<20行）之后测试gui。
使用空布局和绝对定位不是一个好主意。swing设计用于布局管理器。
下面是完整的可运行代码。

  1. import java.awt.BorderLayout;
  2. import java.awt.Dimension;
  3. import java.awt.Graphics;
  4. import java.awt.event.ActionEvent;
  5. import java.awt.event.ActionListener;
  6. import java.awt.image.BufferedImage;
  7. import java.io.File;
  8. import java.io.IOException;
  10. import javax.imageio.ImageIO;
  11. import javax.swing.JFileChooser;
  12. import javax.swing.JFrame;
  13. import javax.swing.JMenu;
  14. import javax.swing.JMenuBar;
  15. import javax.swing.JMenuItem;
  16. import javax.swing.JPanel;
  17. import javax.swing.SwingUtilities;
  18. import javax.swing.filechooser.FileNameExtensionFilter;
  20. public class ImageDisplay implements Runnable {
  22.     public static void main(String[] args) {
  23.         SwingUtilities.invokeLater(new ImageDisplay());
  24.     }
  26.     private ImageDisplayModel model;
  28.     private ImagePanel imagePanel;
  30.     private JFrame frame;
  32.     public ImageDisplay() {
  33.         this.model = new ImageDisplayModel();
  34.     }
  36.     @Override
  37.     public void run() {
  38.         frame = new JFrame("Image Display");
  39.         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  40.         frame.setJMenuBar(createMenuBar());
  42.         imagePanel = new ImagePanel(model);
  43.         frame.add(imagePanel, BorderLayout.CENTER);
  45.         frame.pack();
  46.         frame.setLocationByPlatform(true);
  47.         frame.setVisible(true);
  48.     }
  50.     private JMenuBar createMenuBar() {
  51.         JMenuBar menubar = new JMenuBar();
  53.         JMenu filemenu = new JMenu("File"); 
  55.         JMenuItem openitem = new JMenuItem("Open...");
  56.         openitem.addActionListener(new OpenFileListener(this, model));
  57.         filemenu.add(openitem);
  59.         menubar.add(filemenu);
  61.         return menubar;
  62.     }
  64.     public void updateImagePanel(int width, int height) {
  65.         imagePanel.setPreferredSize(width, height);
  66.         imagePanel.repaint();
  67.         frame.pack();
  68.     }
  70.     public JFrame getFrame() {
  71.         return frame;
  72.     }
  74.     public class ImagePanel extends JPanel {
  76.         private static final long serialVersionUID = 1L;
  78.         private ImageDisplayModel model;
  80.         public ImagePanel(ImageDisplayModel model) {
  81.             this.model = model;
  82.             this.setPreferredSize(649, 480);
  83.         }
  85.         public void setPreferredSize(int width, int height) {
  86.             this.setPreferredSize(new Dimension(width, height));
  87.         }
  89.         @Override
  90.         protected void paintComponent(Graphics g) {
  91.             super.paintComponent(g);
  93.             BufferedImage image = model.getImage();
  94.             if (image != null) {
  95.                 g.drawImage(image, 0, 0, this);
  96.             }
  97.         }
  99.     }
  101.     public class OpenFileListener implements ActionListener {
  103.         private ImageDisplay frame;
  105.         private ImageDisplayModel model;
  107.         public OpenFileListener(ImageDisplay frame, ImageDisplayModel model) {
  108.             this.frame = frame;
  109.             this.model = model;
  110.         }
  112.         @Override
  113.         public void actionPerformed(ActionEvent event) {
  114.             JFileChooser chooser = new JFileChooser();
  115.             FileNameExtensionFilter filter = new FileNameExtensionFilter(
  116.                     "JPG & PNG Images", "jpg", "png");
  117.             chooser.addChoosableFileFilter(filter);
  118.             chooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
  120.             File file = model.getFile();
  121.             if (file != null) {
  122.                 chooser.setCurrentDirectory(file);            
  123.             }
  125.             int result = chooser.showOpenDialog(frame.getFrame());
  126.             if (result == JFileChooser.APPROVE_OPTION) {
  127.                 File selectedFile = chooser.getSelectedFile();
  128.                 model.setFile(selectedFile);
  129.                 BufferedImage image;
  130.                 try {
  131.                     image = ImageIO.read(selectedFile);
  132.                     model.setImage(image);
  133.                     frame.updateImagePanel(image.getWidth(), 
  134.                             image.getHeight());
  135.                 } catch (IOException e) {
  136.                     e.printStackTrace();
  137.                 }
  138.             }
  139.         }
  141.     }
  143.     public class ImageDisplayModel {
  145.         private BufferedImage image;
  147.         private File file;
  149.         public BufferedImage getImage() {
  150.             return image;
  151.         }
  153.         public void setImage(BufferedImage image) {
  154.             this.image = image;
  155.         }
  157.         public File getFile() {
  158.             return file;
  159.         }
  161.         public void setFile(File file) {
  162.             this.file = file;
  163.         }
  165.     }
  167. }
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