列出所有文件

//列出所有文件

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.FilenameFilter;
import java.io.IOException;

public class ListFile implements FilenameFilter
{
 String str=null;
 public ListFile()
 {}

// public ListFile(String s)
// {
//  str="."+s;
// }
// public boolean accept(File dir, String name)
// {
//  return name.endsWith(str);
// }

 public boolean accept(File dir,String name)
 {
  return true;
 }
 
 public static void main(String[] args) throws IOException
 {
  File dir = new File("F:\\学习资料3\\txt文档\\");
  
  ListFile lf=new ListFile("txt");
  File filename[]=dir.listFiles(lf);
  //ListFile lf = new ListFile("java");
  //File filename[]=dir.listFiles(lf);

  ListFile lf = new ListFile();
  String filename[]=dir.list(lf);
  FileWriter fw = new FileWriter("filename.txt");
  BufferedWriter bw = new BufferedWriter(fw);
  for(int i=0;i<filename.length;i++)
  {
   //byte b[]=filename[i].getBytes();   
   bw.write(filename[i]);
   bw.newLine();
   bw.flush();
   //dos.write(b);
   //dos.flush();
  }
  //dos.close();
  //fos.close();
  bw.close();
 }
}