Question

我正在创建一个文本编辑器，这是我的代码的基本版本。我使用UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());使整个事情看起来像我正在使用的平台，但JFileChooser save始终是java的外观。有人可以帮忙吗？我可能会把它放在错误的位置，但我不知道在哪里

import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.filechooser.FileFilter;
import javax.swing.filechooser.FileNameExtensionFilter;

@SuppressWarnings("serial")
    public class TextEditor extends JPanel {
    static Container pane;
    static Container paneText;
    static BasicFrame frame;
    static JTextArea textArea;
    static JScrollPane areaScrollPane;
    static FileFilter txtFile;
    static JFileChooser save = new FileChooser(System.getProperty("user.home//documents"));

    public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException,               UnsupportedLookAndFeelException, IOException {
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        frame = BasicFrame.getInstance();
        pane = frame.getContentPane();
        paneText = new JPanel();
        textArea = new JTextArea();
        textArea.setLineWrap(true);
        textArea.setWrapStyleWord(true);
        areaScrollPane = new JScrollPane(textArea);
        areaScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        areaScrollPane.setPreferredSize(new Dimension(250, 250));
        int hGap = 10;
        int vGap = 20;
        pane.setLayout(new FlowLayout(FlowLayout.LEFT, hGap, vGap));
        Action SaveAs = new SaveAs("Save File", "Writes the text file");
        JButton one = new JButton(SaveAs);
        one.addActionListener(null);
        txtFile = new FileNameExtensionFilter("Text File (.txt)", "txt");
        save.addChoosableFileFilter(txtFile);
        save.setFileFilter(txtFile);
        save.setAcceptAllFileFilterUsed(true);
        pane.add(areaScrollPane);
        pane.add(one);
        pane.add(paneText);
        paneText.setLayout(new BoxLayout(paneText, BoxLayout.Y_AXIS));
        frame.setSize(450, 320);
        frame.setVisible(true);
    }

    static class SaveAs extends AbstractAction {
        public SaveAs(String text, String desc) {
            super(text);
            putValue(SHORT_DESCRIPTION, desc);
        }

        public void actionPerformed(ActionEvent e) {
            save.setFileHidingEnabled(false);
            save.setApproveButtonText("Save");
            save.setSelectedFile(new File("new 1"));
            int actionDialog = save.showSaveDialog(null);
            if (actionDialog != JFileChooser.APPROVE_OPTION) {
                return;
            } else {
                log("Done!", true);
            }
            String name = save.getSelectedFile().getAbsolutePath();
            if (!name.endsWith(".txt") && save.getFileFilter() == txtFile) {
                name += ".txt";
            }
            BufferedWriter outFile = null;
            try {
                outFile = new BufferedWriter(new FileWriter(name));
                textArea.write(outFile);

            } catch (IOException ioe) {
                ioe.printStackTrace();
            } finally {
                if (outFile != null) {
                    try {
                        outFile.close();
                    } catch (IOException ioee) {
                    }
                }
            }
        }

        private void log(String msg, boolean remove) {

            JLabel label1;
            label1 = new JLabel(msg);
            if (remove) {
                paneText.removeAll();
            }
            paneText.add(label1);
            paneText.validate();
            pane.validate();
            new Thread() {
                public void run() {
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException ie) {
                        ie.printStackTrace();
                    }
                    paneText.removeAll();
                    paneText.validate();
                    pane.validate();
                }
            }.start();
        }
    }
}

Answer 1

代码中的JFileChooser为static，因此会在main中设置外观之前进行实例化。

在实例化之前设置外观。因此，自static JFileChooser static以来，... static FileFilter txtFile; static JFileChooser save; static { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException e) { e.printStackTrace(); } save = new JFileChooser(System.getProperty("user.home//documents")); } public static void main(String[] args) { frame = new JFrame(); pane = frame.getContentPane(); ... ...块中都存在{。}}。

{{1}}

Answer 2

而不是System.getProperty("user.home//documents")，键入(System.getProperty("user.home") + "/documents")（假设您的文档文件夹名为“文档”）。前者将返回null，将JFileChooser的位置设置为默认位置 - 用户的主目录。

这是因为"user.home//documents"不是System.getProperty()的已定义键，而"user.home"是。{/ p>

您还应该将JFileChooser设置为new JFileChooser(<path>)而不是new FileChooser(<path>)

Answer 3

必须在初始化Object之前进行LookAndFeel声明，否则该对象将不会使用这些LookAndFeel属性。

UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

THEN

save = new FileChooser(System.getProperty("user.home//documents"));

JFileChooser不遵循外观和感觉

3 个答案: