某个文件夹下的文件分类

package com.djk.io;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;

/**
 * 扫描文件并放入map中
 * @author djk
 *
 */
public class ScanFile
{
	public static void main(String[] args) 
	{
		IFileProcess iFileProcess = new FileProcessImpl();
		Map<String,List<File>> map =iFileProcess.analyFile("D:/test");
	}
}

/**
 *处理文件接口 
 * @author djk
 *
 */
interface IFileProcess
{
	Map<String,List<File>> analyFile(String filePath);
}

/**
 * 实现类
 * @author djk
 *
 */
class FileProcessImpl implements IFileProcess
{

	private static Logger logger = Logger.getLogger(FileProcessImpl.class);
	
	@Override
	public Map<String, List<File>> analyFile(String path)
	{
		Map<String,List<File>> map  = new HashMap<String, List<File>>();
		
		logger.debug("进入方法 analyFile");
		
		if (StringUtils.isEmpty(path))
		{
			logger.debug("路径为空......");
			return map;
		}
		File file = new File(path);
		
		diguiFile(file,map);
		return map;
	}
	
	/**
	 * 递归扫描文件
	 */
	private void diguiFile(File file,Map<String,List<File>> map)
	{
		logger.debug("开始递归文件");
		//如果文件是目录则调用自己否则把文件放入map中
		if (file.isDirectory())
		{
			File [] files = file.listFiles();
			for (File f : files)
			{
				diguiFile(f,map);
			}
		}else
		{
			String fileName = file.getName();
			if (fileName.contains("djk"))
			{
				convertMap("djk",map,file);
			}else if (fileName.contains("whx"))
			{
				convertMap("whx",map,file);
			}else
			{
				logger.debug("该文件是垃圾文件:"+fileName);
			}
			
			
		}
	}
	
	/**
	 * 填充map
	 */
	private void convertMap(String key,Map<String,List<File>> map,File file)
	{
		logger.debug("填充map");
		
		List<File> list = null;
		if (null != map.get(key))
		{
			map.get(key).add(file);
		}else
		{
			list = new ArrayList<File>();
			list.add(file);
			map.put(key, list);
		}
	}
}