1、NIO方式读文件
缓冲区 Channel 基本函数用法 等
2、代码:
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
public class NIOTest
{
private static void readFile(String filePath) throws IOException
{
RandomAccessFile aFile = new RandomAccessFile(filePath, "rw");
FileChannel inChannel = aFile.getChannel();
// NIO buf缓冲区大小
ByteBuffer buf = ByteBuffer.allocate(100);
int bytesRead = inChannel.read(buf);
while(bytesRead != -1)
{
System.out.println("Read " + bytesRead);
// 将Buffer从写模式切换到读模式
buf.flip();
while(buf.hasRemaining())
{
System.out.print((char)buf.get());
}
// 从读模式切换到写模式,不会清空数据,但后续写数据会覆盖原来的数据,即使有部分数据没有读,也会被遗忘
buf.clear();
bytesRead = inChannel.read(buf);
}
aFile.close();
}
public static void main(String[] args)
{
try
{
readFile("xxx/spring/applicationContext.xml");
System.out.println("--------OK-----------");
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
参考博客:
漫谈Java IO之 Netty与NIO服务器:
https://www.cnblogs.com/xing901022/p/8678869.html
Netty IO线程模型学习总结: