A simple file toolset for Java

1 classFileUtils2 {3     //total number of files under file directory4      Public Static intfilenumber (File dir)5     {6         intFileNumber = 0;7         if(Dir.exists ())8         {9              for(File file:dir.listFiles ())Ten             { One                 if(File.isdirectory ()) A                 { -FileNumber = filenumber+filenumber (file); -                 } the                 Else -                 { -filenumber++; -                 } +             } -         } +         returnfilenumber; A     } at      -     //determine if the file is a picture -      Public Static Booleanisimage (File imgfilepath) -     { -         Try -         { inFileInputStream Imgfis =NewFileInputStream (imgfilepath); -             byte[]imgbyte =New byte[Imgfis.available ()]; to             if((Imgfis.read (imgbyte))!=-1) +             { -                 if(Imgbyte[0] = = (byte) ' G ' && imgbyte[1] = = (byte) ' I ' && imgbyte[2] = = (byte) ' F ') the                 { *                     return true; $                 }Panax Notoginseng                 Else if(Imgbyte[1] = = (byte) ' P ' && imgbyte[2] = = (byte) ' N ' && imgbyte[3] = = (byte) ' G ') -                 { the                     return true; +                 } A                 Else if(Imgbyte[6] = = (byte) ' J ' && imgbyte[7] = = (byte) ' F ' && imgbyte[8] = = (byte) ' I ' && imgbyte[9] = = (byte) ' F ') the                 { +                     return true; -                 } $                 Else $                 { -                     return false; -                 } the             } -}Catch(Exception e)Wuyi         { the System.out.println (e.tostring ()); -             return false; Wu         } -         return false; About     } $  -  -     //returns an array of files for all files in this directory -      Public Staticfile[] Listalldirectory (File dir) A     { +         if(dir!=NULL&&dir.exists ()) the         { -File []finalfile =NewFile[filenumber (dir)]; $             intMarkfile =0; the             intFileln=0; theFile files[] =dir.listfiles (); the              for(inti=0;i<files.length;i++) the             { -                 if(Files[i].isdirectory ()) in                 { the listalldirectory (Files[i]); the                 } About                 Else the                 { thefinalfile[markfile++]=Files[i]; the                 } +             } -             returnFinalfile; the         }Bayi         Else the         { the             return NULL; -         } -     } the  the      the     //copying files (with file channels) the      Public Static voidcopyFile (File oldfileabsolutepath,file newfilepath) -     { theFile Newfileabsolutepath =NewFile (Newfilepath,oldfileabsolutepath.getname ()); theFileInputStream fi =NULL; theFileOutputStream fo =NULL;94FileChannel in =NULL; theFileChannel out =NULL; the         Try { thefi =NewFileInputStream (oldfileabsolutepath);98FO =NewFileOutputStream (newfileabsolutepath); Aboutin =Fi.getchannel (); -out =Fo.getchannel ();101In.transferto (0, In.size (), out);102}Catch(IOException e)103             {104 e.printstacktrace (); the             }106             finally107                 {108                     Try109                         { the fi.close ();111 in.close (); the fo.close ();113 out.close (); the}Catch(IOException e) the                             { the e.printstacktrace ();117                             }118                 }119     } -}

A simple file toolset for Java