java程序如何将8g的文件，在jvm内存2g的情况下-CFANZ编程社区

java程序如何将8g的文件，在jvm内存2g的情况下

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

public class Test {
    public static void main(String[] args) throws Exception{
        Long startTime = System.currentTimeMillis();

        testByteBuffer();

        Long endTime = System.currentTimeMillis();
        // 计算并打印耗时
        Long tempTime = (endTime - startTime);
        System.out.println("花费时间："+
                (((tempTime/86400000)>0)?((tempTime/86400000)+"d"):"")+
                ((((tempTime/86400000)>0)||((tempTime%86400000/3600000)>0))?((tempTime%86400000/3600000)+"h"):(""))+
                ((((tempTime/3600000)>0)||((tempTime%3600000/60000)>0))?((tempTime%3600000/60000)+"m"):(""))+
                ((((tempTime/60000)>0)||((tempTime%60000/1000)>0))?((tempTime%60000/1000)+"s"):(""))+
                ((tempTime%1000)+"ms"));

    }

    static File file = new File("E:\\Linux【更多IT资源加微信wxdhhfy】\\Linux\\hadoop000-Snapshot1.vmem");

    static  int bufferSize = 1024;

    public static void testByteBuffer() throws IOException {
        FileChannel channel = new FileInputStream(file).getChannel();
        ByteBuffer buffer = ByteBuffer.allocate(bufferSize);
        int bytes;
        while ((bytes = channel.read(buffer)) != -1) {
            byte[] data = new byte[bytes];
            buffer.flip();
            buffer.get(data);
            buffer.clear();
        }
        channel.close();
    }
}