[Building Sakai] File in Sakai

[le tan vu]

Hello everyone
I'm using Sakai 2.6.0
With java.io.File, I'm trying to make some new file at temp directory of
tomcat. In order to do that, I use File.createTempFile(prefix,subfix)
function. But it gives me a file with a strange name, not the filename I
want.
Another way, I use createNewFile() function but it makes new file in bin
directory of tomcat.

How I can make new file at temp directory and exact name I want?

Is there any solution which can work around?

Thanks in advanced and best regards.
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