java创建内存映射文件（共享内存）代码示例，java示例,package cn.o

java创建内存映射文件（共享内存）代码示例，java示例,package cn.o

package cn.outofmemory.snippets.core;import java.io.File;import java.io.IOException;import java.io.RandomAccessFile;import java.nio.ByteBuffer;import java.nio.channels.FileChannel;public class CreateMemoryMappedFile {    public static void main(String[] args) {        try {            File file = new File("myfile.dat");            // create a random access file stream (for read only)            FileChannel readOnlyChannel = new RandomAccessFile(file, "r").getChannel();            // map a region of this channel's file directly into memory            ByteBuffer readOnlyBuf =                      readOnlyChannel.map(FileChannel.MapMode.READ_ONLY, 0, (int) readOnlyChannel.size());            // create a random access file stream (read-write)            FileChannel readWriteChannel = new RandomAccessFile(file, "rw").getChannel();            // map a region of this channel's file directly into memory            ByteBuffer readWriteBuf =                    readWriteChannel.map(FileChannel.MapMode.READ_WRITE, 0, (int) readWriteChannel.size());            // create a random access file stream (private/copy-on-write))            FileChannel privateChannel = new RandomAccessFile(file, "rw").getChannel();            // map a region of this channel's file directly into memory            ByteBuffer privateBuf =                      privateChannel.map(FileChannel.MapMode.PRIVATE, 0, (int) privateChannel.size());        }        catch (IOException e) {            System.out.println("I/O Error: " + e.getMessage());        }    }}