Java implementation to cut a large file into n fixed-size files

    //Java implementation to cut a large file into n fixed-size files     Packagecom.johnny.test; ImportJava.io.BufferedReader; ImportJava.io.File; ImportJava.io.FileInputStream; ImportJava.io.FileOutputStream; ImportJava.io.FileReader; Importjava.io.IOException;  Public classFengefile { Public Static FinalString SUFFIX = ". txt";//filename suffix after splitting//splits the specified file by the number of bytes of the given file, where name refers to the name of the file that needs to be split, and size refers to the specified small file.             Public StaticString[] Divide (String name,LongSizethrowsException {File file=NewFile (name); if(!file.exists () | | (!file.isfile ())) {                             Throw NewException ("The specified file does not exist!")                     ”); }                     //to get the parent file of the split file, the small file will be divided into this directoryFile Parentfile =File.getparentfile (); //get the size of the file                    LongFilelength =file.length (); SYSTEM.OUT.PRINTLN ("File size:"+filelength+"bytes"); if(Size <= 0) {size= FILELENGTH/2; }                     //The number of small files that have been split                    intnum = (filelength% size! = 0)? (int) (Filelength/size + 1)                                     : (int) (Filelength/size); //Store the small file name after being splitstring[] FileNames =NewString[num]; //input file stream, which is the split fileFileInputStream in =Newfileinputstream (file); //read the start and end subscript of the input file stream                    LongEnd = 0; intBegin = 0; //output files based on the number of partitions to be split                     for(inti = 0; i < num; i++) {                             //for the first num–1 small file, the size is specifiedFile OutFile =NewFile (Parentfile, file.getname () + i +SUFFIX); //build a small file output streamFileOutputStream out =NewFileOutputStream (OutFile); //end subscript to move sizeEnd + =size; End= (End > Filelength)?Filelength:end; //Read bytes from the input stream are stored in the output stream                             for(; begin < End; begin++) {out.write (In.read ());                             } out.close (); Filenames[i]=Outfile.getabsolutepath ();                     } in.close (); returnFileNames; }              Public Static voidReadfilemessage (String fileName) {//read out the contents of a small file that is split intoFile File =NewFile (fileName); BufferedReader Reader=NULL; Try{Reader=NewBufferedReader (Newfilereader (file)); String String=NULL; //reads the content by line until NULL is read to indicate the end of the read file                             while(String = Reader.readline ())! =NULL) {System.out.println (string);                     } reader.close (); } Catch(IOException e) {e.printstacktrace (); } finally {                             if(Reader! =NULL) {                                     Try{reader.close (); } Catch(IOException E1) {}}} }              Public Static voidMainFinalString[] args)throwsException {String name= "d:/boss/123. txt "; Longsize = 1024*1024*4;//1k=1024b (bytes)string[] FileNames =fengefile.divide (name, size); System.out.println ("File"+ name +"The result of the segmentation is as follows:");  for(inti = 0; i < filenames.length; i++) {System.out.println (Filenames[i]+"The contents are as follows:"); //fengefile.readfilemessage (Filenames[i]);System.out.println (); }             }     } 

Java implementation to cut a large file into n fixed-size files