file IO 读取文件夹

package com.suypower.djbxt.czxs.bean;

/*
import java.io.File;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;

public class FileTest
{
    public static void main(String[] args)
    {
        File directory = new File("e:\\tomcat5.5\\");
        List fileList = listAllFiles(directory);

        Set fileNameSet = new HashSet(fileList.size());
        for (int i = 0 ; i< fileList.size() ; i++)
        {
            File file = (File)fileList.get(i);
            fileNameSet.add(file.getAbsolutePath());
        }
        for (Iterator i = new TreeSet(fileNameSet).iterator() ; i.hasNext() ; )
        {
            System.out.println(i.next());
        }
    }
    private static List listAllFiles(File directory)
    {
        if (directory == null || !directory.isDirectory())
		{
            return null;
        }
        List fileList = new ArrayList();
        addSubFileList(directory,fileList);
        return fileList;
    }
    private static void addSubFileList(
        File file,
        List fileList
    ){
        File[] subFileArray = file.listFiles();
        if (subFileArray == null
            || subFileArray.length == 0
        ){
            return;
        }
        for (int i = 0 ; i < subFileArray.length ; i++)
        {
            File subFile = subFileArray[i];
            if (subFile == null
            ){
                continue;
            }
            if (subFile.isFile()
            ){
                fileList.add(subFile);
                continue;
            }
            else if (subFile.isDirectory()
            ){
                addSubFileList(subFile, fileList);
            }   }   }  }

*/
import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;

public class Directory {
	private List file = new ArrayList();

	private File f;

	public Directory() {
	}

	public List getAllFile(String dir_name) {
		File[] files = null;
		try {
			f = new File(dir_name);
			files = f.listFiles();
			for (int i = 0; i < files.length; i++) {
				if (files[i].isFile()) {
					file.add(files[i].getName());
				} else {
					getAllFile(files[i].getAbsolutePath());
				}
			}
		} catch (Exception e) {
			System.out.println("目录路径不正确。");
		}
		Collections.sort(file, new Com());
		return file;
	}

	public static void main(String[] args) {
		List l = new Directory().getAllFile("e:\\db2");
		Iterator it = l.iterator();
		while (it.hasNext()) {
			System.out.println(it.next());
		}
	}
}

// 比较器
class Com implements Comparator {

	public int compare(Object o1, Object o2) {
		String s = (String) o1;
		String s1 = (String) o2;
		return s.compareTo(s1);
	}
}