Java Copy file (file input/output stream)

ImportJava.io.BufferedInputStream;ImportJava.io.BufferedOutputStream;ImportJava.io.File;ImportJava.io.FileInputStream;Importjava.io.FileNotFoundException;ImportJava.io.FileOutputStream;Importjava.io.IOException; Public classCopyfiledemo { Public Static voidMain (string[] args) {CopyFile ("C:\\a.txt", "D:\\b.txt"); }        Private Static Final intOutput_file_buffer_size = 4*1024; Private Static BooleancopyFile (String srcdir,string desdir) {//file StreamFileInputStream FileInputStream =NULL; FileOutputStream FileOutputStream=NULL; //using the CacheBufferedinputstream bis;                Bufferedoutputstream Bos; //the length of each read        intReadlength = 0; //Current Position        intPosition = 0; //Printing InformationSystem.out.println ("CopyFile srcdir:" + Srcdir + "Desdir:" +Desdir); //target fileFile Disfileinfo =NULL; //Source file InformationFile FileInfo =NewFile (Srcdir); if(!fileinfo.exists ()) {System.out.println ("The source file does not exist return false"); return false; }                //Define Cache Size        byte[] buffer =New byte[Output_file_buffer_size]; Try{FileInputStream=NewFileInputStream (FileInfo); } Catch(FileNotFoundException e) {e.printstacktrace (); return false; }        //Buffered input streambis =NewBufferedinputstream (FileInputStream, 0x4000); //detects if the target file exists to create a fileDisfileinfo =NewFile (Desdir); if(!disfileinfo.exists ()) {            Try{disfileinfo.createnewfile (); } Catch(IOException e) {e.printstacktrace (); return false; }        }                Try{FileOutputStream=NewFileOutputStream (Disfileinfo); } Catch(FileNotFoundException e) {e.printstacktrace (); return false; }        //Buffered output streamBOS =NewBufferedoutputstream (FileOutputStream, 0x10000);  while(Position! =fileinfo.length ()) {            if(Position! =fileinfo.length ()) {                Try {                    //{@                    /*Core Code*/                    //reads each byte into the specified byte array at the given offset from this byte input stream bufferReadlength = bis.read (buffer, 0, output_file_buffer_size); //writes Len bytes from offset off to the specified byte array in buffer to this buffered output streamBos.write (buffer, 0, readlength); Position+=readlength; //@}}Catch(IOException e) {e.printstacktrace (); return false; }            }        }                //close the stream in turn        if(bis! =NULL){            Try{bis.close (); } Catch(IOException e) {e.printstacktrace (); return false; }        }                if(Bos! =NULL){            Try{bos.close (); } Catch(IOException e) {e.printstacktrace (); return false; }        }                if(Position = =fileinfo.length ()) {System.out.println ("CopyFile success!"); return true; }                return false; }}

Java Copy file (file input/output stream)