Java NIO Copy File case

Requirements: Copy of the implementation file

Practice Purpose:

1. Understand Javanio knowledge, mainly focus on the relationship between Fileinputstream,filechannel,fileoutputstream,bytebuffer

2. Learn how to get FileChannel

Public class copyfile {    public static void main (String[]  args)  throws Exception {        String  infile =  "GitHub.txt";         string outfile =   "GitHub2.txt";                 //gets the input stream and output stream of the source and destination files         fileinputstream fin =  new fileinputstream (InFile);        fileoutputstream  Fout = new fileoutputstream (OutFile);                 //get input, output channel          Filechannel fcin = fin.getchannel ();         filechannel  fcout = fout.getchannel();                 //Create buffers         bytebuffer buffer = bytebuffer.allocate (1024);                 while  ( True)  {                     //clear buffer data, can receive new data              buffer.clear ();                     //reading data from input channels to buffers              int r = fcin.read (buffer);         The             //read method returns the number of bytes read, possibly 0,  Returns -1   &NBSP if the channel has reached the end of the stream;        if  (r == -1)  {                 break;             }            The          //flip method allows the buffer to write the newly read data to another channel              buffer.flip ();                     //from buffer   write data to   output channel              fcout.write (buffer);         }                 //Last Close         fcin.close ();         fout.clOSE ();     }} 

Summarized as follows:

1. Flow of data:

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1. When do I call FileChannel's Read,write method?

Determine according to the direction of the data

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This article is from the "Xej Distributed Studio" blog, so be sure to keep this source http://xingej.blog.51cto.com/7912529/1968417

Java NIO Copy File case