Java：在客户端和servlet之间传递消息的适当方式？

My system successfully passes objects from a client to servlet. However it is primitive as it was built to cater for Java 1.1. The message object it passes consists of an int (representing one of about seventy types) and a String of tokens which need to be parsed (the tokens may contain a list, a list of objects, etc). Not good!My system successfully passes objects from a cl