Java NIO教程（五） 通道之間的資料傳輸

在Java NIO中，如果兩個通道中有一個是FileChannel，那你可以直接將資料從一個channel（譯者注：channel中文常譯作通道）傳輸到另外一個channel。

transferFrom()

FileChannel的transferFrom()方法可以將資料從源通道傳輸到FileChannel中（譯者注：這個方法在JDK文件中的解釋為將位元組從給定的可讀取位元組通道傳輸到此通道的檔案中）。下面是一個簡單的例子：

RandomAccessFile fromFile = new RandomAccessFile( "fromFile.txt", "rw" );
FileChannel      fromChannel = fromFile.getChannel( );

RandomAccessFile toFile = new RandomAccessFile( "toFile.txt", "rw" );
FileChannel      toChannel = toFile.getChannel( );

long position = 0;
long count = fromChannel.size( );

toChannel.transferFrom( position, count, fromChannel );
 

transferTo()

RandomAccessFile fromFile = new RandomAccessFile( "fromFile.txt", "rw" );
FileChannel      fromChannel = fromFile.getChannel( );

RandomAccessFile toFile = new RandomAccessFile( "toFile.txt", "rw" );
FileChannel      toChannel = toFile.getChannel( );

long position = 0;
long count = fromChannel.size( );

fromChannel.transferTo( position, count, toChannel );