serialize java object to text file

I have a java library, I would like to save an instance of a java object to a text file. I have tried to use all java libraries for serialization and deserialization to xml: http://karussell.wordpress.com/2009/09/03/xml-serializers-for-java/开发者_开发百科 but deserializing does not work. I have posted a question here: http://stackoverflow.com/questions/6139702/deserializing-xml-file-from-xstream but It seems that I could not get a solution for that.

I also have tried to serialize to json but deserialize from json does not work.

So, I would like to know apart of serializing to xml and json, is there any other way to do serialization and deserialization from a java object (cannot modify to add tags: @XmlRootElement(name="customer")) to text file?

Thanks in advance!

The easiest way is probably to use the native Java serialization. It will generate a binary representation of the object, but you can encode the generated byte array with Base64 to transform it to text:

ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(myObject);
oos.flush();
byte[] binary = baos.toByteArray();
String text = Base64.encodeBase64String(binary); // Base64 is in the apache commons codec library
// save text to a file

Note that the object, and every object it references (recursively) must implement java.io.Serializable for this to work.

You can use Gson to convert java object to Json and vice versa

Here is example from the Gson user guide.

Or may be apache digester can help.