标签:dem rgs 内存映射 string channel map bsp 内存映射文件 system
使用直接缓冲区完成文件的复制(内存映射文件)
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; //使用直接缓冲区完成文件的复制(内存映射文件) public class NIOBufferDemo2 { public static void main(String[] args) throws Exception { //直接缓冲区 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); //缓冲区 MappedByteBuffer inMap = inChannel.map(MapMode.READ_ONLY, 0, inChannel.size()); MappedByteBuffer outMap = outChannel.map(MapMode.READ_WRITE, 0, inChannel.size()); //直接对缓冲区进行数据读写操作 byte[] bytes=new byte[inMap.limit()]; inMap.get(bytes); outMap.put(bytes); outMap.clear(); System.out.println("复制完毕"); } }
标签:dem rgs 内存映射 string channel map bsp 内存映射文件 system
原文地址:https://www.cnblogs.com/cppdy/p/10041693.html