Hi.
This is a somewhat off-topic question, but I'll go ahead and ask it anyway -
I guess some of you must have run into the problem before.
We have an application that uses a servlet as a front-end for a couple of
EJB's. The client is an Applet that uses XML-messaging/RPC over HTTP to
invoke methods on the EJB's through the servlet.The XML-RPC is defined by
us, and is really a light-weight XML-RPC version (http:((www.xmlrpc.org).
We use the XML to specify which EJB to run, and which method to run on the
EJB. Also, the parameters are sent as either plain text, (text nodes) or
XML-documents (inside CDATA-sections within the XML-payload). Return values
are also sent from the servlet to the applet using plaint text och XML.
Now - we want to extend this functionality a bit, and allow parameters and
return values being sent as serialized java objects. The idea is to
serialize the object into a byte-array and somehow send this array as a
string within the XML-payload. The string is then put into a byte-array and
deserialized. This works fine - but I'm not sure we've solved it in the most
elegant way :/
Again - the idea is to represent the serialized object as a String. Below is
the utility-code we're using to read/write the object/string:
// Write an object to a String
public static String getString( Object object )
throws IOException
{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream os = new ObjectOutputStream(baos);
os.writeObject(object);
os.flush();
byte[] b = baos.toByteArray();
StringBuffer buff = new StringBuffer();
for( int i = 0; i < b.length; i++ ){
buff.append( b[i] );
if( i < (b.length-1) )
buff.append(",");
}
os.close();
baos.close();
return buff.toString();
}
//Read an object from a String
public static Object getObject( String data )
throws IOException, ClassNotFoundException
{
StringTokenizer tok = new StringTokenizer(data, ",");
byte[] b = new byte[tok.countTokens()];
int i = 0;
while( tok.hasMoreTokens() )
b[i++] = Byte.valueOf(tok.nextToken()).byteValue();
ByteArrayInputStream bin = new ByteArrayInputStream(b);
ObjectInputStream oin = new ObjectInputStream(bin);
Object o = oin.readObject();
oin.close();
bin.close();
return o;
}
<<eof>>
This is a bit akward as the format of the string is defined entirely by us..
Do you guys have any other ideas on how to represent the object as a string,
and then read the string deserializing the object again?
Best Regards /Anders
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