openfiledialog.java

初学的好东西值得一看看欢迎下载观看使用

import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;
import java.io.File;
class OpenFileDialog{
	public static void main(String[] args){
		JFileChooser jFileChooser1=new JFileChooser();
		Txt_file_filter filter1=new Txt_file_filter();
		jFileChooser1.setFileFilter(filter1);
		int result=jFileChooser1.showOpenDialog(null);
		if(result==JFileChooser.APPROVE_OPTION){
			File selectedFile=jFileChooser1.getSelectedFile();
			System.out.println(selectedFile.getPath());
		}
		else if(result==JFileChooser.CANCEL_OPTION){
			System.out.println("单击了打开文件对话框的取消键.");
		}
	}
}
class Txt_file_filter extends FileFilter{
	public boolean accept(File f){
		if(f!=null){
			if(f.isDirectory()) return true;
			else{
				String filename=f.getName();
				int i=filename.lastIndexOf('.');
				if(i>0 && i<filename.length()-1){
					String extention=filename.substring(i+1).toLowerCase();
					return extention.equals("txt");
				}
				else return false;
			}
		}
		else return false;
			
	}
	public String getDescription(){
		return "文本文件(*.txt)";
	}
}