Get directory size after compression

**TechGate** · 04-02-2010

Hello,
I have a little trouble. I have to zip a directory, so far, things are going pretty well, he zipped the directory. However, I get the directory size before compression zip the directory size after compression zip, and then the compression ratio. How can I do to obtain these values?
Here is my code:

Code:

/ / Create the z with the folder name
z = new ZipOutputStream(new FileOutputStream(folder.getName() + ". z"));
/ / Set the compression mode
z.setMethod(ZipOutputStream.Deflated);
/ / Set the compression level = BEST
z.setlevel(9);
 
/ / It defines a directory path with the "File"
File directory = new File(folder.getPath());
 
/ / We archive all files (recursive) files and
zpeRepertoire(directory, z);
 
/ / We close the z
z.close();

Can you help me with this.

**NetWorkInG** · 04-02-2010

Hello,
I think you can get better than before the compression results are based on coarse heuristics that are more or less reliable. The only way to get the compressed size of a file is to compress it. Knowing that each algorithm compression has its weaknesses and strengths, and each type of file is not compressed in the same way.

**TechGate** · 04-02-2010

Hello,
Ok but how to get the compressed size? I have a compressed zip file, I do something like this, here is a part of my code

Code:

File fl = (File) zip;
longtaille = fl.length();

I have included these in my code, if you have any other alternative to this then you can please post.

**Aaliya Seth** · 04-02-2010

Hello,
Even I was trying the same. I had also included the following lines in my code. But the compiler rejects the following cast

Code:

File file = (File) zip;

Apparently, you can not cast a ZipOutputStream in File. I hope I am correct. If I am not then please guide me with the correct use of it. And even if you have an sample code for this, it will be great.

**GlassFish** · 04-02-2010

Hi,
Normal since zip is not a File object (or a derived object)
Simply retrieve the File directly like this, just have a look at it

Code:

File f = new File(folder.getName() + ". zip");

hope the above line will help you, I will recommend you to try it at-least once and then compile your program and if you get an error then please post here.

**Gunner 1** · 04-02-2010

Hello,
I also seek such information for the size of the zip is settled, but to know the size of the file before, there is nothing? Because I basically want to know if there is enough room on my hard to zip up my repertoire. But why I must know the size of this folder? I think i am confused with the concept of the following.