定义了各种通道,这些通道表示到能够执行 I/O 操作的实体(如文件 和套接字)的连接;定义了用于多路复用的、非阻塞 I/O 操作的选择器。
写文件
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.channels.FileChannel;
public class NioBlockout {
public static void main(String arg[]) {
try {
FileOutputStream fos = new FileOutputStream("nioblock");
FileChannel channel = fos.getChannel();
ByteBuffer bytebuffer = ByteBuffer.allocate(20);
CharBuffer charbuffer = bytebuffer.asCharBuffer();
charbuffer.put("ABCDEFGHI");
channel.position(20);
channel.write(bytebuffer);
channel.close();
} catch(IOException e) {
System.out.println(e);
}
}
}
文件buffer
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;
import java.nio.channels.FileChannel.MapMode;
import java.nio.MappedByteBuffer;
import java.nio.CharBuffer;
public class NioMap {
public static void main(String arg[]) {
try {
RandomAccessFile raf = new RandomAccessFile("nioblock","rw");
FileChannel channel = raf.getChannel();
MappedByteBuffer bytebuffer = channel.map(
FileChannel.MapMode.READ_WRITE,
20,18); // position and size
CharBuffer charbuffer = bytebuffer.asCharBuffer();
bytebuffer.load();
char ch = charbuffer.get(3);
System.out.println("Character: " + ch);
charbuffer.put(3,'X');
channel.close();
} catch(IOException e) {
System.out.println(e);
}
}
}
本文转自gnuhpc博客园博客,原文链接:http://www.cnblogs.com/gnuhpc/archive/2012/12/17/2822311.html,如需转载请自行联系原作者