Java开发网 - 在linux上,用File.length() 获取有些文件的长度是0,请问这是怎么回事？

Topic: 在linux上,用File.length() 获取有些文件的长度是0,请问这是怎么回事？

1.在linux上,用File.length() 获取有些文件的长度是0,请问这是怎么回事？	Copy to clipboard
Posted by: zerol Posted on: 2005-03-17 14:46 我在linux上,用File.length() 获取有些文件的长度是0, 请问这是怎么回事？ TIA //test.java import java.io.*; public class test { public static void main(String args[]) { File file = new File("/proc/mdstat"); System.out.println("file.length(): " + file.length()); } }

2.Re:在linux上,用File.length() 获取有些文件的长度是0,请问这是怎么回事？ [Re: zerol]	Copy to clipboard
Posted by: wtfg_N188 Posted on: 2005-03-18 16:03 不会吧？要不就是你的文件长度确实为0。还有，提醒你一问题，在这里要注意加上try{}catch(){}语句哈~~~~~~

3.Re:在linux上,用File.length() 获取有些文件的长度是0,请问这是怎么回事？ [Re: zerol]	Copy to clipboard
Posted by: floater Posted on: 2005-03-18 22:55 is this soft link?

4.Re:在linux上,用File.length() 获取有些文件的长度是0,请问这是怎么回事？ [Re: zerol]

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Posted by: zerol
Posted on: 2005-03-19 01:36

Here is the answer from TeamB:

The /proc filesystem is a special file system that maintains process
state. The contents don't exist on disk but rather in memory, and the
contents are highly dynamic. Because you're not opening a real file
per se, there's no easy way to determine the length, so Java returns 0.

Details on /proc can be found here:

http://www.freeos.com/articles/2879/