使用listFiles的FileFilter过滤来查找文件并处理

package test;

import java.io.File;
import java.io.FileFilter;

public class MyFilter implements FileFilter {
    @Override
    public boolean accept(File file) {
        if(file.isDirectory())
            return true;
        else
        {
            String name = file.getName();
            if(name.endsWith(".txt") || name.endsWith(".mp4"))
                return true;
            else
                return false;
        }

    }
}

　　

package test;


import java.io.*;

public class test3 {
    public static void main(String[] args) throws IOException {
        File f=new File("e:\\test");
        MyFilter m=new MyFilter();
       File[]file= f.listFiles(m);
       for(File file1:file){
           String destFileName=file1.getName().replaceAll(".txt",".java");
           moveto(file1,destFileName);
       }
    }
    private static void moveto(File f,String dname) throws IOException {
        int len=0;
        FileInputStream in=new FileInputStream(f);
       File ff= new File("E:\\test1"+"\\"+dname);
       if(!ff.exists()){

           ff.getParentFile().mkdir();
       }
        FileOutputStream outputStream=new FileOutputStream(ff);
        byte[]bytes=new byte[10];
        while ((len=in.read(bytes))!=-1){
            outputStream.write(bytes,0,len);
        }
        in.close();
        outputStream.close();
    }
}