java - Adding file into existing Zip Archive -

so followed block of code here: http://commons.apache.org/proper/commons-compress/examples.html, said make ziparchiveentry , insert data. can see code below.

    public void insertfile(file apkfile, file insert, string method)     throws androlibexception {         ziparchiveoutputstream out = null;         ziparchiveentry entry;          try {             byte[] data = files.tobytearray(insert);             out = new ziparchiveoutputstream(new fileoutputstream(apkfile, true));             out.setmethod(integer.parseint(method));             crc32 crc = new crc32();             crc.update(data);             entry = new ziparchiveentry(insert.getname());             entry.setsize(data.length);             entry.settime(insert.lastmodified());             entry.setcrc(crc.getvalue());             out.putarchiveentry(entry);             out.write(data);             out.closearchiveentry();             out.close();         } catch (filenotfoundexception ex) {             throw new androlibexception(ex);         } catch (ioexception ex) {             throw new androlibexception(ex);         } } 

basically, passed file (apkfile) take "insert" file, parameter dictating compression method of file. running block of code results in 0 errors, zip file has "new" file in it. removes previous files , inserts new one.

prior commons-compresss, had copy entire zip temporary file, changes, , copy finalized zip file back. thought library worked around though?

you always want close() streams when done them (i.e. out.close()), preferably in block.