java-文件构建大数组（模板）
RandomAccessFile randomAccessFile = new RandomAccessFile("C:\\Users\\Administrator\\Desktop\\test.pdf","r");
int point = 0;//最开始
long last = 0;//最后
long lenth = randomAccessFile.length();//总长
RandomAccessFile randomAccessFile = new RandomAccessFile("C:\\Users\\Administrator\\Desktop\\test.pdf","r");
int point = 0;//最开始
long last = 0;//最后
long lenth = randomAccessFile.length();//总长
