使用直接緩衝區完成檔案的複製（記憶體對映檔案）

package com.cppdy.nio;

import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.FileChannel.MapMode;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;

//使用直接緩衝區完成檔案的複製（記憶體對映檔案）
public class NIOBufferDemo2 {

    public
 
 static void main(String[] args) throws Exception {

        //直接緩衝區
        FileChannel inChannel = FileChannel.open(Paths.get("F:\\cppdy\\1.jpg"), StandardOpenOption.READ);
        FileChannel outChannel = FileChannel.open(Paths.get("F:\\cppdy\\2.jpg"), StandardOpenOption.READ,StandardOpenOption.WRITE,StandardOpenOption.CREATE);
        
 
//緩衝區
        MappedByteBuffer inMap = inChannel.map(MapMode.READ_ONLY, 0, inChannel.size());
        MappedByteBuffer outMap = outChannel.map(MapMode.READ_WRITE, 0, inChannel.size());
    
        //直接對緩衝區進行資料讀寫操作
        byte[] bytes=new byte[inMap.limit()];
        
        inMap.get(bytes);
        outMap.put(bytes);
        outMap.clear();
        System.out.println(
 
"複製完畢");
    }

}