文件读写实用类

package com.scnulh.util;

 

import java.util.List;

import java.io.File;

import java.io.FilenameFilter;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.regex.Pattern;

 

public class Directory {

   

    public static class TreeInfo implements Iterable<File>{

       public List<File> files=new ArrayList<File>();

       public List<File> dirs=new ArrayList<File>();

      

       @Override

       public Iterator<File> iterator() {       

           return files.iterator();

       }

      

       void addAll(TreeInfo other)

       {

           files.addAll(other.files);

           dirs.addAll(other.dirs);       

       }

      

       public String toString()

       {

           return "dirs:"+PPrint.pformat(dirs)+

                  "\nfiles:"+PPrint.pformat(files);

       }  

    }

   

    /**

     * 递归生成目录及文件树

     * @param startDir

     * @param regex

     * @return

     */

    static TreeInfo recurseDirs(File startDir,String regex)

    {

       TreeInfo result=new TreeInfo();

       for(File item:startDir.listFiles())

       {

           if(item.isDirectory())

           {

              result.dirs.add(item);

              result.addAll(recurseDirs(item, regex));

           }

           else if(item.getName().matches(regex))

              result.files.add(item);

       }

       return result;

    }

   

    public static TreeInfo walk(String start,String regex)

    {

       return recurseDirs(new File(start), regex);

    }

    public static TreeInfo walk(File start,String regex)

    {

       return recurseDirs(start, regex);

    }

   

    public static TreeInfo walk(File start)

    {

       return recurseDirs(start, ".*");

    }

    public static TreeInfo walk (String start)

    {

       return recurseDirs(new File(start), ".*");

    }

   

    public static File[] local(File dir,final String regex)

    {

       return dir.listFiles(new FilenameFilter() {

           private Pattern pattern=Pattern.compile(regex);

           @Override

           public boolean accept(File dir, String name) {

              // TODO Auto-generated method stub

              return pattern.matcher(new File(name).getName()).matches();

           }

       });

    }

   

    public static File[] local(String path,final String regex)

    {

       return local(new File(path),regex);

    }

   

    public static void main(String[] args)

    {

       PPrint.pprint(Directory.walk(".").files);

      

       for(File file:Directory.walk(".", ".*.*\\.class$"))

       {

           System.out.println(file);

       }

      

    }

   

}