fileutil.java

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package com.easyjf.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
/**
*
* <p>Title: 文件处理工具类</p>
* <p>Description:实现文件的简单处理,判断文件类型等 </p>
* <p>Copyright: Copyright (c) 2005</p>
* <p>Company: www.easyjf.com</p>
* @author 蔡世友
* @version 1.0
*/
abstract public class FileUtil {
public final static String IMAGE_FILE_EXT="jpg;jpeg;png;gif;bmp;ico";
public final static String ATTACHE_FILE_EXT="doc;zip;rar;pdf";//附件文件
public final static String FORBID_FILE_EXT="jsp;com;bat";//禁止的文件
public final static String EXE_FILE_EXT="exe;com;bat";
public static boolean isAttacheFile(String fileName)
{	 
	return checkExtFile(ATTACHE_FILE_EXT,fileName);
}
public static boolean isForbidFile(String fileName)
{	 
	return checkExtFile(FORBID_FILE_EXT,fileName);
}
public static boolean isImgageFile(String fileName)
{	 
	return checkExtFile(IMAGE_FILE_EXT,fileName);
}
public static boolean isExeFile(String fileName)
{
	return checkExtFile(EXE_FILE_EXT,fileName);
}
public static boolean checkExtFile(String ext,String fileName)
{
	if(ext==null)return false;
	String[] exts=ext.split(";"); 
	String file=fileName.toLowerCase();
	for(int i=0;i<exts.length;i++)
		if(file.endsWith("."+exts[i]))return true;
	return false;
}
public static String getTempFile(String dir,String fileExt)
{	
	String tempFileName=CommUtil.getRandString(8)+fileExt;
	File file=new File(dir+"/"+tempFileName);
	if(file.exists())return getTempFile(dir,fileExt);
	else return tempFileName;
}
public static boolean saveFile(InputStream in,String fileName)
{
	File outFile=new File(fileName);
	try{		
	FileOutputStream out=new FileOutputStream(outFile);
	byte[] temp=new byte[11024];
	int length=-1;		
	while((length=in.read(temp))>0)
	{
		out.write(temp,0,length);	
	}				
	out.flush();
	out.close();
	in.close();		
	}
	catch(Exception e)
	{
		System.out.println(e);
		return false;
	}
	return true;
}
}