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String path=request.getRealPath("");
//out.println(path);
File f=new File(path,"File.txt");
//out.println(f);
//out.println(f.exists());

if(f.exists()){//¼ì²éFile.txtÊÇ·ñ´æÔÚ
f.delete();//ɾ³ýFile.txtÎļþ
out.println(path + "\\File.txt ´æÔÚ£¬ÒÑɾ³ý¡£");
}else{
f.createNewFile();//ÔÚµ±Ç°Ä¿Â¼Ï½¨Á¢Ò»¸öÃûΪFile.txtµÄÎļþ
out.println(path + "\\File.txt ²»´æÔÚ£¬Òѽ¨Á¢¡£");//Êä³öÄ¿Ç°ËùÔÚµÄĿ¼·¾¶
}
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String path=request.getRealPath("");
path=path + "\\Sub";//½«Òª½¨Á¢µÄĿ¼·¾¶
File d=new File(path);//½¨Á¢´ú±íSubĿ¼µÄFile¶ÔÏ󣬲¢µÃµ½ËüµÄÒ»¸öÒýÓÃ
if(d.exists()){//¼ì²éSubĿ¼ÊÇ·ñ´æÔÚ
d.delete();
out.println("SubĿ¼´æÔÚ£¬ÒÑɾ³ý");
}else{
d.mkdir();//½¨Á¢SubĿ¼
out.println("SubĿ¼²»´æÔÚ£¬Òѽ¨Á¢");
}
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