0
点赞
收藏
分享

微信扫一扫

NIO的分散读取(Scatter Reads)和聚集写入(Gather Writes)

三分梦_0bc3 2022-03-10 阅读 49



分散读取:(数据从一个通道到多个缓存)

         从Channel中读取的数据分散到Buffer中(按照缓冲区的顺序,从Channel中读取的数据依次填满Buffer)



聚集写入:(数据从多个缓存区到一个通道)

将多个Buffer数据  “聚集“ 写入到通道中


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();

}
}



举报

相关推荐

0 条评论