java8中nio通道(Channel)的基本使用

1、利用通道完成文件的复制@Test public void test4() throws Exception{ FileChannel inChannel = FileChannel.open(Paths.get("1.jpg"), StandardOpenOption.READ); FileChannel outChannel = FileChannel.open(Paths.get("2.jpg"), StandardOpenOption.WRITE, StandardOpenOption.READ,StandardOpenOption.CREATE_NEW); //inChannel.transferTo(0,inChannel.size(),outChannel); outChannel.transferFrom(inChannel,0,inChannel.size()); inChannel.close(); outChannel.close(); }

3、通道之间的数据传输@Test public void test4() throws Exception{ FileChannel inChannel = FileChannel.open(Paths.get("1.jpg"), StandardOpenOption.READ); FileChannel outChannel = FileChannel.open(Paths.get("2.jpg"), StandardOpenOption.WRITE, StandardOpenOption.READ,StandardOpenOption.CREATE_NEW); inChannel.transferTo(0,inChannel.size(),outChannel); }

5、关闭输入通道连接@Test public void test4() throws Exception{ FileChannel inChannel = FileChannel.open(Paths.get("1.jpg"), StandardOpenOption.READ); FileChannel outChannel = FileChannel.open(Paths.get("2.jpg"), StandardOpenOption.WRITE, StandardOpenOption.READ,StandardOpenOption.CREATE_NEW); outChannel.transferFrom(inChannel,0,inChannel.size()); inChannel.close(); }