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- package cn.hhj.nio.buffer;
- import java.io.*;
- import java.nio.*;
- import java.nio.channels.*;
- /**
- * IO映射缓冲区
- */
- public class MappedBuffer {
- static private final int start = 0;
- static private final int size = 26;
-
- static public void main( String args[] ) throws Exception {
- RandomAccessFile raf = new RandomAccessFile( "E://test.txt", "rw" );
- FileChannel fc = raf.getChannel();
-
- //把缓冲区跟文件系统进行一个映射关联
- //只要操作缓冲区里面的内容,文件内容也会跟着改变
- MappedByteBuffer mbb = fc.map(FileChannel.MapMode.READ_WRITE,start, size );
-
- mbb.put( 0, (byte)97 ); //a
- mbb.put( 25, (byte)122 ); //z
- raf.close();
- }
- }
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