NIO dispersion read (Scatter Reads) aggregation and writing (Gather Writes)

Dispersion :( read data from one channel to a plurality of cache)

         Channel the data read from the Buffer dispersed (in order to buffer data read from sequentially fill Channel Buffer)

Aggregate data from a plurality of write buffer :( to a channel)

The "aggregate" Buffer data is written to the plurality of channels

import org.junit.jupiter.api.Test;

import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;


public class ChannelTest {

    @Test
    public void channel4() throws IOException {
        RandomAccessFile raf1=new RandomAccessFile("文件路径","文件模式rw");
        //1,获取通道
        FileChannel channel1=raf1.getChannel();

        //2,分配指定大小的缓冲区
        ByteBuffer byteBuffer1=ByteBuffer.allocate(100);
        ByteBuffer byteBuffer2=ByteBuffer.allocate(1024);

        //3,分散读取
        ByteBuffer[]buffers={byteBuffer1,byteBuffer2};
        channel1.read(buffers);
        for (ByteBuffer bf:buffers){
            bf.flip();
        }
        //4,聚集写入
        RandomAccessFile raf2=new RandomAccessFile("目标文件路径","模式rw");
        FileChannel channel2 = raf2.getChannel();
        channel2.write(buffers);

        //5,关闭通道
        channel1.close();
        channel2.close();

    }
}