本文介绍了Java-极端基本的JFileChooser问题的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想制作一个JFileChooser,它允许用户选择任何包含单词"hello"的文件或目录.也就是说,以下是有效的选择:
I'd like to make a JFileChooser that lets the user select any file OR directory that contains the word "hello". That is, the following are valid selections:
C:\hello\
C:\fun\hello.txt
etc.
我该如何工作?我尝试过:
How can i get this working? I've tried:
import java.io.File;
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;
JFileChooser f = new JFileChooser();
f.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
f.setFileFilter(new FileFilter() {
public boolean accept(File file) {
return file.getAbsolutePath().contains("hello");
}
public String getDescription() {
return "hi";
}
});
f.showOpenDialog(this);
但是我的JFileChooser是空白的.那就是说,我的C:\中根本看不到文件夹"fun".
but my JFileChooser is blank. That is to say, I can't see folder "fun" in my C:\ at all.
推荐答案
我不得不做一些其他的覆盖.
I had to do some additional overriding.
两个自定义类和一个跑步者类.试试看.
Two custom classes and a runner class. Give 'em a try.
package custom_file_chooser;
import java.io.File;
import javax.swing.filechooser.FileFilter;
public class MyFileFilter extends FileFilter {
private String filterString;
public MyFileFilter(String filterString) {
super();
this.filterString = filterString;
}
@Override
public boolean accept(File file) {
return file.isDirectory() || file.getName().toLowerCase().contains(filterString);
}
@Override
public String getDescription() {
return filterString + " only";
}
}
package custom_file_chooser;
import java.io.File;
import javax.swing.JFileChooser;
public class MyFileChooser extends JFileChooser {
private String filterString;
public MyFileChooser(String filterString) {
super();
this.filterString = filterString;
setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
setFileFilter(new MyFileFilter(filterString));
}
@Override
public void approveSelection() {
File file = this.getSelectedFile();
if (!file.isDirectory() || file.getName().contains(filterString)) {
super.approveSelection();
}
}
}
package custom_file_chooser;
import java.io.File;
import javax.swing.JFileChooser;
public class CustomFileChooserRunner {
public static void main(String[] args) {
MyFileChooser f = new MyFileChooser("hello");
int result;
result = f.showOpenDialog(null);
if (result == JFileChooser.APPROVE_OPTION) {
File file = f.getSelectedFile();
System.out.println("You chose to open: " +
file.getName() + (file.isDirectory() ? " directory" : " file"));
}
}
}
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