Java Applet 随机存取存储
我有一个java项目，它使用java.io.RandomAccessFile来管理数据加载。它通过文件进行搜索，创建关键点图，然后可以根据需要加载该图。这很好用。
我想让它作为小程序运行，但它需要安全权限来创建一个可以存储下载文件的临时文件，这对其预期用途来说是一个巨大的障碍。
我想我可以腾出内存（几MB）来将内容存储在某种内存缓冲区中，然后以与处理本地文件相同的方式随机访问它...
有没有一种方法可以创建临时文件而不需要安全权限（我假设没有）？
最好的缓冲选项是什么？如何将基于 URL 的输入流的内容放入缓冲区，从中读取字节，并能够记录和更改当前的查找位置？
I have a java project that uses java.io.RandomAccessFile to manage data loading. It seeks through the file creating a map of key points which can then be loaded as needed later. This works great.
I want to make it run as an applet but it requires security permissions to create a temp file that a downloaded file could be stored in, and that's a huge barrier for it's intended usage.
I think I can spare the memory (a few MB) to store the contents in a memory buffer of some sort and then random access it in the same way I treat local files...
Is there a way to create a temp file without requiring security permissions (I assume not)?
What is the best buffering option? How would I get the contents of a URL based input stream into the buffer, read bytes from it, and be able to record and change the current seek position?
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首先查看此讨论：用于内存字节数组的类似 RandomAccessFile 的 API？
Check this discussion first: RandomAccessFile-like API for in-memory byte array?