How can I encrypt java 7z archive?

Question

I'm using Apache Commons Compress to compress files. How do I add a password to the archive so?

public static void main(String args[]) throws FileNotFoundException, IOException {
SevenZOutputFile sevenZOutput = new SevenZOutputFile(new File("outFile.7z"));
File entryFile = new File("D:/image.jpg");
SevenZArchiveEntry entry = sevenZOutput.createArchiveEntry(entryFile, entryFile.getName());
sevenZOutput.putArchiveEntry(entry);
FileInputStream in = new FileInputStream(entryFile);
                int len;
                byte buffer[] = new byte[8192];
                int transferedMegaBytes2=0;
                while ((len = in.read(buffer)) > 0) {
                    sevenZOutput.write(buffer, 0, len);                    
                    transferredBytes += len;
                    int transferedMegaBytes = (int) (transferredBytes / 1048576);                          
                    if(transferedMegaBytes>transferedMegaBytes2){
                    System.out.println("Transferred: " + transferedMegaBytes + " Megabytes.");
                    transferedMegaBytes2=transferedMegaBytes;
                    }
                }
sevenZOutput.closeArchiveEntry();
sevenZOutput.close();    
}

Answer 1

I am afraid the compression is not supported. You may want to use this JNI wrapper.

If you do that, you'll probably lose the platform independence. (They say it is cross-platform, but I wouldn't bet on it)