javacompressiongzipgzipoutputstream

String to GZIPOutputStream


I've tried searching and couldn't find anything. What I'm trying to do is I'm looping through a list where I'm constructing a string from a combination of items from multiple lists. I then want to dump these strings to a gzipped file. I got it working with just dumping it to a plain ascii text file but I can't seem to get it to work with the gzipoutputstream. So basically,

Loop create string dump string to gzipped file endloop

If possible, I'd like to avoid dumping to a plain text file then gzipping it since these files will be almost 100 meg each.


Solution

  • Yes, you can do this no problem. You just need to use a writer to convert from your character based strings to the byte based gzip stream.

        BufferedWriter writer = null;
        try {
            GZIPOutputStream zip = new GZIPOutputStream(
                new FileOutputStream(new File("tmp.zip")));
    
            writer = new BufferedWriter(
                new OutputStreamWriter(zip, "UTF-8"));
    
            String[] data = new String[] { "this", "is", "some", 
                "data", "in", "a", "list" };
    
            for (String line : data) {
                writer.append(line);
                writer.newLine();
            }
        } finally {         
            if (writer != null)
                writer.close();
        }
    

    Also, remember gzip just compresses a stream, if you want embeded files, see this post: gzip archive with multiple files inside