小练习：nio读写文件，将fileread中的内容读取到filewrite中

try {            //创建输入通道            FileInputStream fis = new FileInputStream("F:/iotest/readfile.txt");            FileChannel readChannel = fis.getChannel();            //创建缓冲区            ByteBuffer buffer = ByteBuffer.allocate(500);            //创建输出通道            FileOutputStream fos = new FileOutputStream("F:/iotest/filewrite.txt");            FileChannel writeChannel = fos.getChannel();                        while (true) {                buffer.clear();                //将文件内容读到缓冲区中                int mark = readChannel.read(buffer);                if (mark==-1) {                    break;                }                buffer.flip();                writeChannel.write(buffer);            }                    } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }

代码运行前：

readfile：

 

filewrite：

代码运行后：

readfile：

 

filewrite：