代码
public File getFile(){
final JFileChooser fc = new JFileChooser();
fc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
// JFileChooser.FILES_ONLY
// JFileChooser.DIRECTORIES_ONLY
int returnVal = fc.showOpenDialog(this);
File file_choosed = fc.getSelectedFile();
return file_choosed;
}