// Creates an ASiC archive after which every entry is read back from the archive.

// Name of the file to hold the ASiC archive
File archiveOutputFile=new File(System.getProperty("java.io.tmpdir"),"asic-sample-default.zip");

// Creates an AsicWriterFactory with default signature method
AsicWriterFactory asicWriterFactory = AsicWriterFactory.newFactory();

// the following variables are needed:
// keyStore, keyStorePassword, keyAlias, privateKeyPassword

// Creates the actual container with all the data objects (files) and signs it.
AsicWriter asicWriter = asicWriterFactory.newContainer(archiveOutputFile)
    // Adds an ordinary file, using the file name as the entry name
    .add(biiEnvelopeFile)
    // Adds another file, explicitly naming the entry and specifying the MIME type
    .add(biiMessageFile,BII_MESSAGE_XML,MimeType.forString("application/xml"))
    // Signing the contents of the archive, closes it for further changes.
    .sign(keyStore,keyStorePassword,keyAlias,privateKeyPassword);

// Opens the generated archive and reads each entry
AsicReader asicReader = AsicReaderFactory.newFactory().open(archiveOutputFile);

String entryName;

// Iterates over each entry and writes the contents into a file having same name as the entry
while((entryName = asicReader.getNextFile()) != null){
    log.debug("Read entry "+entryName);
    
    // Creates file with same name as entry
    File file = new File(entryName);
    // Ensures we don't overwrite anything
    if(file.exists()){
        throw new IllegalStateException("File already exists");
    }
    asicReader.writeFile(file);
    
    // Removes file immediately, since this is just a test 
    file.delete();
}
asicReader.close(); 

// create a byte stream to hold the data
ByteArrayOutputStream byteArrayOutputStream=new ByteArrayOutputStream();

// create an asic writer
AsicWriter asicWriter = AsicWriterFactory.newFactory().newContainer(byteArrayOutputStream);


// get the certificate of the recipient
X509Certificate recipientCertificate =...

// create an encoded writer for the given recipient
CmsEncryptedAsicWriter writer  =new CmsEncryptedAsicWriter(asicWriter,recipientCertificate);


// add a "file" from another byte stream to the container
String message = ...
String fileName = ...
InputStream fileStream = new ByteArrayInputStream(message.getBytes(StandardCharsets.UTF_8));

writer.addEncrypted(fileStream,fileName);

// set the root file if there is a root / major file and the rest are attachments
writer.setRootEntryName(fileName);

// the following variables are needed:
// keyStore, keyStorePassword, keyAlias, privateKeyPassword
writer.sign(new SignatureHelper(keyStore,keyStorePassword,keyAlias,privateKeyPassword));

AsicReader asicReader = AsicReaderFactory.newFactory().open(asicContainerByteArrayInputStream);

PrivateKey receiverPrivateKey = ...

CmsEncryptedAsicReader reader = new CmsEncryptedAsicReader(asicReader,receiverPrivateKey);