Layered IO Streams (ZipOutputStream)

Hi all,
I've been trying to get some layered streaming going.
Zip File (created on the fly) + Other Files -> Jar archive
Getting everything into a jar archive is ok, but I'd like to be able to create the zip file on the fly without having to make a temporary file elsewhere. But I run into problems signing off the streams. If I set some streams up simply as follows:
ZipOutputStream zos = new ZipOutputStream(new BufferedOutputStream( new
FileOutputStream(new File("out/output.jar"))));
zos.putNextEntry(new ZipEntry("demo1.zip"));
ZipOutputStream zps = new ZipOutputStream(zos);
zps.putNextEntry(new ZipEntry("readme1.txt"));
zps.flush();
zps.closeEntry();
zps.close();
zos.closeEntry();
zos.putNextEntry(new ZipEntry("demo2.zip"));
zos.close();
This snippet doesn't actually read or write anything, but still triggers the error. I get a stream closed error when it hits zos.closeEntry(). I'm guessing this is because zps.close() closes down everything, including its underlying streams.
Problems is though, if I dont use zps.close() it doesn't sign off the zip file correctly. I end up with an End-of-central-signature directory not found error when I try to open the zip file that has been created.
Got pretty stumped on this. Anyone tried layering ZipOutputStreams like this successfully?
Cheers.

oh damn I feel like a buffoon! Spent hours looking at that and I don't know how many times I looked up the ZipOutputStream in the javadocs and didn't see the finish method.
Thanks for the reply.
DJ.

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ArrayList accounts = new ArrayList();
File accDir = new File("C:" + File.separator + "accounts");
String [] accFiles = accDir.list();
while(i < accDir.length()){
filename = accFiles;
try{
ObjectInputStream in = new ObjectInputStream(new FileInputStream("C:"+ File.separator + "accounts" + File.separator + filename));
account = (Account)in.readObject();
accounts.add(account);
in.close();
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filename = null;
i++;
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By the way, your the first Java programmer that I've met that doesn't like comments! :)
NOTE: Think I may have spotted where I went wrong in my code.
filename = accFiles;
Forgot to point it at the specific element of the array, like so:
filename = accFiles[i];
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I am trying to zip a file in the client side and sending it to the server side machine......there, i am trying to unzip it and writting it over there...for this, i am using a seperate program in the client side and in the server side.................................
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snippet code for ur reference...
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zipoutputstream.flush();
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zipoutputstream.close();
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while (in.read()!=-1); // the said while loop....................
System.runFinalization();
urlconnection.getInputStream().close();
urlconnection.disconnect();
the way of connecting witht the server : (just a snippet of the code)
URL serverURL = new URL("http://192.168.10.55:8001/servlet/uploadservlet");
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urlconnection.setDoOutput(true);
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urlconnection.setDoInput(true);
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Server Side:
javax.servlet.ServletInputStream servletinputstream = httpservletrequest.getInputStream();
ZipInputStream zipinputstream = new ZipInputStream(servletinputstream);
ZipEntry zipentry = null;
String directory="c:\\test"; // the unzipped file should be written to this directory...
try
File file = new File(directory);
if(!file.exists())
file.mkdirs();
catch(Exception exp)
{System.out.println("I am from Server: " + exp);}
try
zipentry = zipinputstream.getNextEntry();
if(zipentry != null)
int slash = zipentry.getName().lastIndexOf(File.separator) + 1;
String filename = zipentry.getName().substring(slash);
File file1 = new File(directory + File.separator + filename);
FileOutputStream fostream = new FileOutputStream(file1);
BufferedOutputStream bufferedoutputstream = new BufferedOutputStream(fostream);
byte abyte0[] = new byte[1024];
for(int index = 0; (index = zipinputstream.read(abyte0)) > 0;)
bufferedoutputstream.write(abyte0, 0, index);
servletinputstream.close();
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zipinputstream.close();
fostream.flush();
fostream.close();
catch(IOException ioexception)
{System.out.println("IOException occured in the Server: " + ioexception);ioexception.printStackTrace();}
P.S: I am not getting any error in the server side or cleint side...the only problem is, the command prompt(where i am running my cleint program) is getting standing indefinitely...i have to use control-c to come to the command prompt again...this is because of the while looop said in the client machine....if i remove it...the file is not gettting transfered...what to do????

Some thoughts:
1) please quote your code so it's readable (see http://forum.java.sun.com/faq.jsp#messageformat ).
2) why are you calling "System.runFinalization();"?
3) Offhand I don't see where the read would ever stop. It's waiting for an end of input from the server, but the server doesn't even begin to write output to it. What happens when you connect to your server with a browser or some other client?
4) is it really wise to read and write one byte at a time?

HELP -ZipOutputStream performance is not consistent across servers

Hi,
I have a pretty standard code that zips one folder in a zip file using ZipOutputStream. The folders that are zipped are 2 GB in size and consists of TIFF images files.
We are currentinly in the testing phase and notice very inconsistent performance issues with the Zipping module. On the integration server, to zip 2 GB of data, the zip module took 5 minutes. However, when the same zip code runs on the staging server, it takes 20 minutes. Both the servers are the same in RAM capacity and processing powers. The size of the data is also the same: 20 GB.
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The free space could be an issue, but you can improve your code:
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipDestination+"/"+zipFileName));
ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipDestination+"/"+zipFileName)));That will improve your performance considerably on all platforms. Also change your buffer of 4096 to 16k or 32k.
You could also consider converting the TIFF files to JPEG instead of zipping them at all.

Layered IO Streams (ZipOutputStream)

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