包含目录中文件列表的JList

我创建了一个JList ，其中包含目录中的文件列表。 这是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：

  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; } 

问题是我想在JList中使用此方法的结果（文本文件列表）。 如何将File对象放在JList ？

Answer 1

不要将字符串放入JList ，使用File对象并设置渲染器。 由于默认渲染器返回的组件是JLabel ，因此可以轻松设置图标。

 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; } } 

Answer 2

@Andrew Thompson

eeeergght没有什么好从今晚03:36 AM来自我的TimeZone和06:00我必须醒来，

但在某个地方，我失去了（不是我）JLabel，天哪

 import java.awt.*; import java.io.File; import javax.swing.*; import javax.swing.filechooser.FileSystemView; public class FilesInTheJList { public FilesInTheJList() { JList displayList = new JList(new File("C:\\").listFiles()); displayList.setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION); displayList.setCellRenderer(new MyCellRenderer()); displayList.setLayoutOrientation(javax.swing.JList.HORIZONTAL_WRAP); displayList.setName("displayList"); JFrame f = new JFrame("Files In the JList"); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setPreferredSize(new Dimension(500, 300)); displayList.setVisibleRowCount(-1); f.add(new JScrollPane(displayList)); f.pack(); f.setVisible(true); } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { FilesInTheJList fITJL = new FilesInTheJList(); } }); } private static class MyCellRenderer extends DefaultListCellRenderer { private static final long serialVersionUID = 1L; @Override public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) { if (value instanceof File) { File file = (File) value; setText(file.getName()); setIcon(FileSystemView.getFileSystemView().getSystemIcon(file)); if (isSelected) { setBackground(list.getSelectionBackground()); setForeground(list.getSelectionForeground()); } else { setBackground(list.getBackground()); setForeground(list.getForeground()); } setEnabled(list.isEnabled()); setFont(list.getFont()); setOpaque(true); } return this; } } } 

 import java.awt.*; import java.io.File; import javax.swing.*; import javax.swing.filechooser.FileSystemView; public class FilesInTheJList { private static final int COLUMNS = 4; private Dimension size; public FilesInTheJList() { final JList list = new JList(new File("C:\\").listFiles()) { private static final long serialVersionUID = 1L; @Override public Dimension getPreferredScrollableViewportSize() { if (size != null) { return new Dimension(size); } return super.getPreferredScrollableViewportSize(); } }; list.setFixedCellHeight(50); list.setFixedCellWidth(150); size = list.getPreferredScrollableViewportSize(); size.width *= COLUMNS; list.setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION); list.setCellRenderer(new MyCellRenderer()); list.setVisibleRowCount(0); list.setLayoutOrientation(JList.HORIZONTAL_WRAP); JFrame f = new JFrame("Files In the JList"); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.add(new JScrollPane(list)); f.pack(); f.setVisible(true); } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { FilesInTheJList fITJL = new FilesInTheJList(); } }); } private static class MyCellRenderer extends JLabel implements ListCellRenderer { private static final long serialVersionUID = 1L; @Override public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) { if (value instanceof File) { File file = (File) value; setText(file.getName()); setIcon(FileSystemView.getFileSystemView().getSystemIcon(file)); if (isSelected) { setBackground(list.getSelectionBackground()); setForeground(list.getSelectionForeground()); } else { setBackground(list.getBackground()); setForeground(list.getForeground()); } setPreferredSize(new Dimension(250, 25)); setEnabled(list.isEnabled()); setFont(list.getFont()); setOpaque(true); } return this; } } } 

Answer 3

我不太明白你在做什么 – 看起来你想要过滤JList的内容只是扩展名为.txt文件。 在这种情况下，您可能希望实现一个FilenameFilter ，它将导致list()返回String[]中的文件名列表，该列表仅匹配您指定的内容。

例如，

 public String[] ReadDirectory() { String path = "C://Documents and Settings/myfileTxt"; String files = null; File folder = new File(path); FilenameFilter txtFilter = new TextFileFilter(); String[] listOfFiles = folder.listFiles(txtFilter); return listOfFiles; } public class TextFileFilter extends FilenameFilter { public boolean accept(File dir, String name) { if(name != null && name.endsWith(".txt")) { return true; } return false; } } 

Answer 4

创建字符串List fnames = new ArrayList(); ，用文件名（ fnames.add(files); ）填充它，然后使用list.setListData(fnames.toArray());将其设置为JList list.setListData(fnames.toArray()); 。 我想这应该有效。

Answer 5

只需像这样编辑你的代码，

 public ArrayList ReadDirectory() { String path = "C://Documents and Settings/myfileTxt"; ArrayList files = new ArrayList(); File folder = new File(path); File[] listOfFiles = folder.listFiles(); for (int i = 0; i < listOfFiles.length; i++) { if (listOfFiles[i].isFile()) { files.add(listOfFiles[i].getName()); if (files.endsWith(".txt") || files.endsWith(".TXT")) { System.out.println(files); } } } return files; } 

这将返回ArrayList对象，然后您可以将该ArrayList对象转换为普通数组。

像这样的东西，让我们说你的变量名是，

 ArrayList listData = new ArrayList(); 

只需这样做就可以将它转换为普通数组，

 listData.toArray();