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41 lines (34 loc) · 1.04 KB
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package com.NIO.core;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
/**
* Buffer测试<br>
* buffer使用步骤：
* 1、写入数据到Buffer
* 2、调用flip()方法
* 3、从Buffer中读取数据
* 4、调用clear()方法或者compact()方法
*
* @author chenming
* @date 2016-11-21
* @since v1.0.0
*/
public class BufferTest {
public static void main(String[] args) throws Exception {
RandomAccessFile file = new RandomAccessFile("E:/workspace/channelTest.txt","rw");
FileChannel fileChannel = file.getChannel();
//对buffer对象进行分配
ByteBuffer buf = ByteBuffer.allocate(24);
int bytesRead = fileChannel.read(buf);
while (bytesRead != -1){
buf.flip(); //切换到读模式
while (buf.hasRemaining()){
System.out.println((char)buf.get());
}
buf.clear(); //清空缓存
bytesRead = fileChannel.read(buf);
}
file.close();
}
}