I take it you're using a SimpleFormController or similar. The onSubmit method returns a ModelAndView. What you need to do is to add the result you want to show as an object to the ModelAndView. So, you might decide to set a Boolean variable called 'succeeded' to True or False depending on how the insert went.
Code:
int status = memberJdbc.insert(empNo,empName,designation, projectManagerId,clusterManagerId,location,psaGrade,projectName);
boolean ok=(status==1);
//Your ModelAndView object...
modelAndView.addObject("succeeded",new Boolean(ok));
Your JSP which displays the result can then use the variable 'succeeded' to decide what to display. (You could, of course, use a String or other variable instead of a Boolean, it's just a means of passing information into your view).