Java 使用 JFileChooser 过滤文件类型
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Filter file types with JFileChooser
提问by Brian
I am using JFileChooser to select a file and I am trying to limit the display to show only jpg or jpeg files. I have tried FileFilter and ChoosableFileFilter and it is not limiting the file selection. Here is my code:
我正在使用 JFileChooser 来选择一个文件，我试图将显示限制为仅显示 jpg 或 jpeg 文件。我尝试过 FileFilter 和 ChoosableFileFilter 并且它不限制文件选择。这是我的代码：
JFileChooser chooser = new JFileChooser();
FileFilter filter = new FileNameExtensionFilter("JPEG file", new String[] {"jpg", "jpeg"});
chooser.setFileFilter(filter);
chooser.addChoosableFileFilter(filter);
int returnVal = chooser.showOpenDialog(null);
if(returnVal == JFileChooser.APPROVE_OPTION) {
debug.put("You chose to open this file: " + chooser.getSelectedFile().getAbsolutePath());
File selectedFile = new File(chooser.getSelectedFile().getAbsolutePath());
...
回答by Nihar
Try and use fileChooser.setFileFilter(filter)instead of fileChooser.addChoosableFileFilter(filter).
尝试使用fileChooser.setFileFilter(filter)而不是fileChooser.addChoosableFileFilter(filter).
回答by Sanzhar
Try to use fileChooser.setFileFilter(filter)after fileChooser.addChoosableFileFilter(filter), because you need to add your filterto fileChooserand then setting it as default value.
尝试使用fileChooser.setFileFilter(filter)after fileChooser.addChoosableFileFilter(filter)，因为您需要添加您的filtertofileChooser然后将其设置为默认值。
Here is the link with good example: http://www.java2s.com/Code/Java/Swing-JFC/CustomizingaJFileChooser.htm
这是带有很好示例的链接：http: //www.java2s.com/Code/Java/Swing-JFC/CustomizingaJFileChooser.htm
回答by makata
Here is a sample code!
这是一个示例代码！
private void btnChangeFileActionPerformed(java.awt.event.ActionEvent evt) {
final JFileChooser fc = new JFileChooser();
fc.addChoosableFileFilter(new ArffFilter());
int returnVal = fc.showOpenDialog(this);
...
}
Then
然后
class ArffFilter extends FileFilter {
@Override
public boolean accept(File file) {
if (file.isDirectory()) {
return true;
}
String fileName = file.getName();
int i = fileName.lastIndexOf('.');
if (i > 0 && i < fileName.length() - 1) {
if (fileName.substring(i + 1).toLowerCase().equals("arff")) {
return true;
}
}
return false;
}
@Override
public String getDescription() {
return ".arff (Weka format)";
}
}
回答by Stefan Sprenger
Try this:
尝试这个：
import javax.swing.JFileChooser;
JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileFilter(new FileFilter() {
public String getDescription() {
return "JPG Images (*.jpg)";
}
public boolean accept(File f) {
if (f.isDirectory()) {
return true;
} else {
String filename = f.getName().toLowerCase();
return filename.endsWith(".jpg") || filename.endsWith(".jpeg") ;
}
}
});
回答by shieldgenerator7
Do you mean "it's not limiting the selection" as in "it's allowing the option for any file type"? If so, then try JFileChooser.setAcceptAllFileFilterUsed(boolean).
您的意思是“它不限制选择”，如“它允许选择任何文件类型”？如果是这样，然后尝试JFileChooser.setAcceptAllFileFilterUsed(boolean)。
chooser.setAcceptAllFileFilterUsed(false);
According to the JFileChooser documentation, it should tell it not to add the all-file-types file filter to the file filter list.
根据JFileChooser 文档，它应该告诉它不要将 all-file-types 文件过滤器添加到文件过滤器列表中。
