{"id":939,"date":"2018-09-17T18:39:34","date_gmt":"2018-09-17T09:39:34","guid":{"rendered":"https:\/\/chat-messenger.com\/?p=939"},"modified":"2018-12-23T01:53:23","modified_gmt":"2018-12-22T16:53:23","slug":"filechannel-transferto","status":"publish","type":"post","link":"https:\/\/chat-messenger.com\/en\/blog\/java\/filechannel-transferto","title":{"rendered":"Java File Copy (easy and fast)"},"content":{"rendered":"

Java File Copy (easy and fast)<\/a>FileChannel#transferTo<\/h2>\n

\n\u3000In JavaCopy Files<\/strong>The following is a sample program that does the following
\nThe sample programs are based on the New I\/O FileChannel#transferTo<\/strong> method.
\nThis is the simplest coding method, as it allows you to write a program for copy processing without having to be aware of the buffer required for reading data.\n<\/p>\n

What is a channel?<\/a><\/h2>\n

\nThe word channel is used in many different ways.
\nBasically, it seems to indicate a transmission path for inputting and outputting data between other devices.FileChannel<\/strong> will be a class that represents a connection for reading and writing to a file.
\n
transferTo<\/strong> The method can transfer byte data from the source file to the destination channel.<\/p>\n

The following is taken from the JavaAPI documentation.\n<\/p>\n

\ntransferTo(long position, long count, WritableByteChannel target)<\/strong>
\nTransfers bytes from a file on this channel to the specified writable byte channel.
\nThis method may be much more efficient than a simple loop of reading data from this channel and writing it to the target channel. Many operating systems can transfer bytes directly from the file system cache to the target channel. No bytes are copied at this time.\n<\/p><\/blockquote>\n

\nThis verification result shows how to use a normal stream,
\nThe copy process was faster than other FileChannel methods (such as using the ByteBuffer#allocateDirect method).<\/p>\n