包含目录中文件列表的JList [英] JList that contains the list of Files in a directory

问题描述

我创建了一个 JList ，其中包含目录中的文件列表。
这是 JList 。

I created a JList that contains a list of files that are in a directory. Here is the JList.

JList MList;
String ListData[]
// Create a new listbox control
List = new JList(ListData);

我还创建了一个方法来读取目录中的文本文件列表：

I also created a method that reads a list of text files in a directory:

     public String ReadDirectory() {
        String path = "C://Documents and Settings/myfileTxt";

        String files = null;
        File folder = new File(path);
        File[] listOfFiles = folder.listFiles();

        for (int i = 0; i < listOfFiles.length; i++) {
            if (listOfFiles[i].isFile()) {
                files = listOfFiles[i].getName();
                if (files.endsWith(".txt") || files.endsWith(".TXT")) {
                    System.out.println(files);
                }
            }
        }
        return files;
    }

问题是我想要这个方法的结果（文本文件列表） ）在 JList 中。
如何将文件对象放在 JList ？

The problem is I want the result of this method (the list of text files) in a JList. How can I put the File objects in the JList?

推荐答案

不要将字符串放入 JList ，使用文件对象并设置渲染器。由于默认渲染器返回的组件是 JLabel ，因此很容易设置图标。

Don't put strings into the JList, use File objects and set a renderer. Since the component returned by the default renderer is a JLabel, it is easy to set an icon.

import java.awt.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import javax.swing.border.Border;
import javax.swing.filechooser.FileSystemView;
import java.io.File;
import java.io.FileFilter;

/**
This code uses a JList in two forms (layout orientation vertical & horizontal wrap) to
display a File[].  The renderer displays the file icon obtained from FileSystemView.
*/
class FileList {

    public Component getGui(File[] all, boolean vertical) {
        // put File objects in the list..
        JList fileList = new JList(all);
        // ..then use a renderer
        fileList.setCellRenderer(new FileRenderer(!vertical));

        if (!vertical) {
            fileList.setLayoutOrientation(javax.swing.JList.HORIZONTAL_WRAP);
            fileList.setVisibleRowCount(-1);
        } else {
            fileList.setVisibleRowCount(9);
        }
        return new JScrollPane(fileList);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                File f = new File(System.getProperty("user.home"));
                FileList fl = new FileList();
                Component c1 = fl.getGui(f.listFiles(new TextFileFilter()),true);

                //f = new File(System.getProperty("user.home"));
                Component c2 = fl.getGui(f.listFiles(new TextFileFilter()),false);

                JFrame frame = new JFrame("File List");
                JPanel gui = new JPanel(new BorderLayout());
                gui.add(c1,BorderLayout.WEST);
                gui.add(c2,BorderLayout.CENTER);
                c2.setPreferredSize(new Dimension(375,100));
                gui.setBorder(new EmptyBorder(3,3,3,3));

                frame.setContentPane(gui);
                frame.pack();
                frame.setLocationByPlatform(true);
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }
}

class TextFileFilter implements FileFilter {

    public boolean accept(File file) {
        // implement the logic to select files here..
        String name = file.getName().toLowerCase();
        //return name.endsWith(".java") || name.endsWith(".class");
        return name.length()<20;
    }
}

class FileRenderer extends DefaultListCellRenderer {

    private boolean pad;
    private Border padBorder = new EmptyBorder(3,3,3,3);

    FileRenderer(boolean pad) {
        this.pad = pad;
    }

    @Override
    public Component getListCellRendererComponent(
        JList list,
        Object value,
        int index,
        boolean isSelected,
        boolean cellHasFocus) {

        Component c = super.getListCellRendererComponent(
            list,value,index,isSelected,cellHasFocus);
        JLabel l = (JLabel)c;
        File f = (File)value;
        l.setText(f.getName());
        l.setIcon(FileSystemView.getFileSystemView().getSystemIcon(f));
        if (pad) {
            l.setBorder(padBorder);
        }

        return l;
    }
}

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