我正在寻找一种让 JFileChooser 允许用户从仅包含在 Eclipse 项目的 bin 文件中的 txt 文件中进行选择的方法。有没有办法让 JFileChooser 弹出并显示位于 bin 文件夹中的选定数量的 txt 文件?
问问题
13795 次
3 回答
3
您可以参考以下代码,只需指定文件夹/目录的绝对或相对路径
JFileChooser chooser = new JFileChooser();
FileNameExtensionFilter filter = new FileNameExtensionFilter(
"TXT files", "txt");
chooser.setFileFilter(filter);
chooser.setCurrentDirectory("<YOUR DIR COMES HERE>");
int returnVal = chooser.showOpenDialog(parent);
if(returnVal == JFileChooser.APPROVE_OPTION) {
System.out.println("You chose to open this file: " +
chooser.getSelectedFile().getName());
}
于 2012-12-06T12:29:16.490 回答
2
另一种方法是实现 FileSystemView 以便它只显示您的目录并防止在层次结构或其他“驱动器”中上升。
这是这样一个 FileSystemView 的演示。您必须在输入中提供根目录(即 bin 的路径,可能是诸如new File("bin")
工作目录被认为是 Eclipse 项目的根目录,这是 Eclipse 默认执行的操作)。
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.filechooser.FileSystemView;
public class TestJFileChooser2 {
public static class MyFileSystemView extends FileSystemView {
private File root;
public MyFileSystemView(File root) {
super();
try {
this.root = root.getCanonicalFile();
} catch (IOException e) {
this.root = root;
}
}
@Override
public File[] getRoots() {
return new File[] { root };
}
@Override
public File createNewFolder(File containingDir) throws IOException {
return FileSystemView.getFileSystemView().createNewFolder(containingDir);
}
@Override
public File createFileObject(String path) {
File file = super.createFileObject(path);
if (isEmbedded(file)) {
return file;
} else {
return root;
}
}
@Override
public File createFileObject(File dir, String filename) {
if (isEmbedded(dir)) {
return super.createFileObject(dir, filename);
} else {
return root;
}
}
@Override
public File getDefaultDirectory() {
return root;
}
private boolean isEmbedded(File file) {
while (file != null && !file.equals(root)) {
file = file.getParentFile();
}
return file != null;
}
@Override
public File getParentDirectory(File dir) {
File parent = dir.getParentFile();
if (isEmbedded(parent)) {
return parent;
} else {
return root;
}
}
}
protected void initUI() {
JFrame frame = new JFrame("Test file chooser");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JButton ok = new JButton("Click me to select file");
ok.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
final JFileChooser openFC = new JFileChooser(new MyFileSystemView(new File("")));
openFC.setDialogType(JFileChooser.OPEN_DIALOG);
// Configure some more here
openFC.showDialog(ok, null);
}
});
}
});
frame.add(ok);
frame.setBounds(100, 100, 300, 200);
frame.setVisible(true);
}
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnsupportedLookAndFeelException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new TestJFileChooser2().initUI();
}
});
}
}
于 2012-12-06T16:16:47.447 回答
2
所以你只想显示目录中的某些文本文件?
如果找到匹配项,则使用FileFilter
将检查文件名与ArrayList
文件名的匹配项,它将返回true
允许JFileChooser
显示文件
就像是:
JFileChooser fc=..;
fc.setCurrentDirectory(new File("path/to/bin/"));//put path to bin here
....
ArrayList<String> filesToSee=new ArrayList<>();
//add names of files we want to be visible to user of JFileChooser
filesToSee.add("file1.txt");
filesToSee.add("file2.txt");
fc.addChoosableFileFilter(new MyFileFilter(filesToSee));
//By default, the list of user-choosable filters includes the Accept All filter, which enables the user to see all non-hidden files. This example uses the following code to disable the Accept All filter:
fc.setAcceptAllFileFilterUsed(false);
....
class MyFileFilter extends FileFilter {
private ArrayList<String> files;
public MyFileFilter(ArrayList<String> files) {
this.files=files;
}
//Accept only files in passed array
public boolean accept(File f) {
for(String s:files) {
if(f.getName().equals(s)) {
return true;
}
}
return false;
}
//The description of this filter
public String getDescription() {
return "Specific Files";
}
}
参考:
于 2012-12-06T13:13:58.470 回答