如何从文件实例的绝对路径设置 jLabel 的 ImageIcon

Question

我想将所选图像文件中的照片添加到 jPanel，但是以下代码似乎不起作用：

    private void browsePhotoButtonActionPerformed(java.awt.event.ActionEvent evt) {                                                  
    JFileChooser fileChooser = new JFileChooser();
    String[] fileSuffixes = ImageIO.getReaderFileSuffixes();
    for(String fileSuffix:fileSuffixes){
        FileFilter filter = new FileNameExtensionFilter(fileSuffix + " files", fileSuffix);
        fileChooser.addChoosableFileFilter(filter);
    }
    int selection = fileChooser.showOpenDialog(EmployeeInternalFrame.this);
    if(selection == JFileChooser.APPROVE_OPTION){
        File fileBeingOpened = fileChooser.getSelectedFile();
        setPhotoFile(fileBeingOpened);
        setImageURL(getPhotoFile().getAbsolutePath());
        photoPanel.removeAll();
        Icon icon = new ImageIcon(getImageURL());
        JLabel label = new JLabel(icon, SwingConstants.LEFT);
        photoPanel.add(label);
        photoPanel.repaint();
    }
}

我缺少哪一部分？感谢大家的帮助。

[编辑]

这是上面代码实现的 Class :

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package forms;

import dataobjects.Employee;
import datamodels.EmployeeTableModel;
import datacontrollers.EmployeeController;
import java.io.File;
import java.awt.Image;
import java.awt.Label;
import javax.swing.filechooser.FileNameExtensionFilter;
import javax.swing.event.ListSelectionListener;
import javax.swing.event.ListSelectionEvent;
import javax.swing.filechooser.FileFilter;
import javax.swing.SwingConstants;
import javax.swing.JFileChooser;
import javax.swing.JTextField;
import javax.swing.ImageIcon;
import javax.swing.JComboBox;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.JLabel;
import javax.swing.Icon;
import javax.imageio.ImageIO;
import javax.swing.JOptionPane;

/**
 *
 * @author Benignus
 */
public class EmployeeInternalFrame extends javax.swing.JInternalFrame{

    private EmployeeTableModel employeeTableModel;
    private String imageURL;
    private EmployeeController employeeController;
    private File photoFile;
    private Image photoImage;

    /**
     * Creates new form EmployeeInternalFrame
     */
    public EmployeeInternalFrame() {
        initComponents();
        employeeTableModel = new EmployeeTableModel();
        employeeTable.setModel(employeeTableModel);
        employeeController = new EmployeeController(this);
        employeeTable.getSelectionModel().addListSelectionListener(new ListSelectionListener(){
            @Override
            public void valueChanged(ListSelectionEvent e) {
                int row = employeeTable.getSelectedRow();
                if(row != -1){
                    Employee employee = employeeTableModel.getAtIndex(row);
                    ssnText.setText(employee.getSsn());
                    nameText.setText(employee.getName());
                    positionComboBox.setSelectedItem(employee.getPosition());
                    basePayText.setText(String.valueOf(employee.getBasePay()));
                    banText.setText(employee.getBan());
                    imageURL = employee.getPhoto();
                }
            }
        });
        refreshTable();
    }


    public String getImageURL() {
        return imageURL;
    }

    public void setImageURL(String imageURL){
        this.imageURL = imageURL;
    }

    public EmployeeTableModel getEmployeeTableModel() {
        return employeeTableModel;
    }

    public JButton getBackButton() {
        return backButton;
    }

    public JTextField getBanText() {
        return banText;
    }

    public JTextField getBasePayText() {
        return basePayText;
    }

    public JButton getBrowsePhotoButton() {
        return browsePhotoButton;
    }

    public JTable getEmployeeTable() {
        return employeeTable;
    }

    public JButton getInputButton() {
        return inputButton;
    }

    public JTextField getNameText() {
        return nameText;
    }

    public JPanel getPhotoPanel() {
        return photoPanel;
    }

    public JComboBox getPositionComboBox() {
        return positionComboBox;
    }

    public JComboBox getSearchByComboBox() {
        return searchByComboBox;
    }

    public JTextField getSearchText() {
        return searchText;
    }

    public JTextField getSsnText() {
        return ssnText;
    }

    private void refreshTable(){
        employeeController.selectAll();
    }

    public File getPhotoFile() {
        return photoFile;
    }

    public void setPhotoFile(File photoFile) {
        this.photoFile = photoFile;
    }

    public Image getPhotoImage() {
        return photoImage;
    }

    public void setPhotoImage(Image photoImage) {
        this.photoImage = photoImage;
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        photoPanel = new javax.swing.JPanel();
        browsePhotoButton = new javax.swing.JButton();
        jScrollPane1 = new javax.swing.JScrollPane();
        employeeTable = new javax.swing.JTable();
        positionComboBox = new javax.swing.JComboBox();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();
        ssnText = new javax.swing.JTextField();
        nameText = new javax.swing.JTextField();
        inputButton = new javax.swing.JButton();
        backButton = new javax.swing.JButton();
        basePayText = new javax.swing.JTextField();
        banText = new javax.swing.JTextField();
        jLabel5 = new javax.swing.JLabel();
        searchText = new javax.swing.JTextField();
        jLabel7 = new javax.swing.JLabel();
        searchByComboBox = new javax.swing.JComboBox();

        photoPanel.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));

        javax.swing.GroupLayout photoPanelLayout = new javax.swing.GroupLayout(photoPanel);
        photoPanel.setLayout(photoPanelLayout);
        photoPanelLayout.setHorizontalGroup(
            photoPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 111, Short.MAX_VALUE)
        );
        photoPanelLayout.setVerticalGroup(
            photoPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 149, Short.MAX_VALUE)
        );

        browsePhotoButton.setText("Browse Photo");
        browsePhotoButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                browsePhotoButtonActionPerformed(evt);
            }
        });

        employeeTable.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null}
            },
            new String [] {
                "Title 1", "Title 2", "Title 3", "Title 4"
            }
        ));
        jScrollPane1.setViewportView(employeeTable);

        positionComboBox.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));

        jLabel1.setText("SSN");

        jLabel2.setText("Name");

        jLabel3.setText("Position");

        jLabel4.setText("Base Pay");

        inputButton.setText("Input");
        inputButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                inputButtonActionPerformed(evt);
            }
        });

        backButton.setText("Back");

        jLabel5.setText("BAN");

        jLabel7.setText("Search By :");

        searchByComboBox.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(20, 20, 20)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createSequentialGroup()
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                                    .addGroup(layout.createSequentialGroup()
                                        .addComponent(jLabel5)
                                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 30, Short.MAX_VALUE)
                                        .addComponent(banText, javax.swing.GroupLayout.PREFERRED_SIZE, 170, javax.swing.GroupLayout.PREFERRED_SIZE))
                                    .addGroup(layout.createSequentialGroup()
                                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                            .addGroup(layout.createSequentialGroup()
                                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                                    .addComponent(jLabel1)
                                                    .addComponent(jLabel2)
                                                    .addComponent(jLabel4))
                                                .addGap(6, 6, 6))
                                            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                                                .addComponent(jLabel3)
                                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)))
                                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                                            .addComponent(basePayText)
                                            .addComponent(ssnText, javax.swing.GroupLayout.DEFAULT_SIZE, 170, Short.MAX_VALUE)
                                            .addComponent(nameText, javax.swing.GroupLayout.DEFAULT_SIZE, 170, Short.MAX_VALUE)
                                            .addComponent(positionComboBox, 0, 170, Short.MAX_VALUE))))
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                    .addComponent(photoPanel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addComponent(browsePhotoButton, javax.swing.GroupLayout.PREFERRED_SIZE, 110, javax.swing.GroupLayout.PREFERRED_SIZE)))
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(inputButton, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addGap(20, 20, 20)
                                .addComponent(backButton, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE))))
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 470, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel7)
                        .addGap(5, 5, 5)
                        .addComponent(searchByComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, 120, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(10, 10, 10)
                        .addComponent(searchText, javax.swing.GroupLayout.PREFERRED_SIZE, 150, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(photoPanel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(9, 9, 9)
                        .addComponent(browsePhotoButton)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED))
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jLabel1)
                                .addGap(26, 26, 26)
                                .addComponent(jLabel2)
                                .addGap(63, 63, 63)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                                    .addComponent(jLabel4)
                                    .addComponent(basePayText, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(ssnText, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addGap(20, 20, 20)
                                .addComponent(nameText, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addGap(20, 20, 20)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                                    .addComponent(positionComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addComponent(jLabel3))))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(banText, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jLabel5))
                        .addGap(17, 17, 17)))
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(inputButton)
                    .addComponent(backButton))
                .addGap(18, 18, 18)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 90, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jLabel7)
                    .addComponent(searchByComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(searchText, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(15, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                        

    private void browsePhotoButtonActionPerformed(java.awt.event.ActionEvent evt) {                                                  
        JFileChooser fileChooser = new JFileChooser();
        String[] fileSuffixes = ImageIO.getReaderFileSuffixes();
        for(String fileSuffix:fileSuffixes){
            FileFilter filter = new FileNameExtensionFilter(fileSuffix + " files", fileSuffix);
            fileChooser.addChoosableFileFilter(filter);
        }
        int selection = fileChooser.showOpenDialog(EmployeeInternalFrame.this);
        if(selection == JFileChooser.APPROVE_OPTION){
            File fileBeingOpened = fileChooser.getSelectedFile();
            setPhotoFile(fileBeingOpened);
            setImageURL(getPhotoFile().getAbsolutePath());
            photoPanel.removeAll();
            Icon icon = new ImageIcon(getImageURL());
            JLabel label = new JLabel(icon, SwingConstants.LEFT);
            photoPanel.add(label);
            photoPanel.repaint();
            JOptionPane.showMessageDialog(this, getImageURL());
        }
    }                                                 

    private void inputButtonActionPerformed(java.awt.event.ActionEvent evt) {                                            
        if(inputButton.getText().equalsIgnoreCase("Input")){

        }
        else if(inputButton.getText().equalsIgnoreCase("Save")){

        }
        else if(inputButton.getText().equalsIgnoreCase("Update")){

        }
    }                                           

    // Variables declaration - do not modify                     
    private javax.swing.JButton backButton;
    private javax.swing.JTextField banText;
    private javax.swing.JTextField basePayText;
    private javax.swing.JButton browsePhotoButton;
    private javax.swing.JTable employeeTable;
    private javax.swing.JButton inputButton;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JLabel jLabel7;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTextField nameText;
    private javax.swing.JPanel photoPanel;
    private javax.swing.JComboBox positionComboBox;
    private javax.swing.JComboBox searchByComboBox;
    private javax.swing.JTextField searchText;
    private javax.swing.JTextField ssnText;
    // End of variables declaration                   
}

Answer 1

ImageIcon(String filename) 的文档指出：

Creates an ImageIcon from the specified file. The image will be preloaded by using MediaTracker to monitor the loading state of the image. The specified String can be a file name or a file path. When specifying a path, use the Internet-standard forward-slash ("/") as a separator. (The string is converted to an URL, so the forward-slash works on all systems.) For example, specify: new ImageIcon("images/myImage.gif") The description is initialized to the filename string.

因此，我认为您的问题出在您作为参数给出的路径中，路径中包含 \。

Answer 2

I "think" the problem is with the use of GroupLayout, it's generally a pain in the ... Code ... Personally, I'd use a different layout, even with the form editor and add a place holder label for the phot, which you can use to set the icon – MadProgrammer yesterday

我把panel的布局改成了Card Layout，现在好了，谢谢大家:)

如何从文件实例的绝对路径设置 jLabel 的 ImageIcon

How to set jLabel's ImageIcon from File instance's absolutePath

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