In Web based programming, we usually check querystring parameters in middle tier java objects and do tedious, if not long, checks via if/else, to perform appropriate action or instantiate classes. A good workaround is to use Java reflection (java.lang.reflect). Class methods, like getMethods[] or getFields[], invoke particular methods based on http querystring params, like Method.invoke(…).
Here is an example java codelet:
//get Class info of your object say 'a'Class c = a.getClass();//to dynamically get Object/fields based on HTTP querystring namevalue pair, say 'requestParam'Field f = c.getField(requestParam);// or else 'invoke' a particular method vis a vis requestParamMethod[] theMethods = c.getMethods();String result = (String) theMethods[0].invoke(requestParam, null);
