Code of Controller Class:-
package bao;
import java.util.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class AdditionExample {
@RequestMapping("/add")
public String loadForm()
{
return "add";
}
@RequestMapping("/addlogic")
public ModelAndView addLogic(HttpServletRequest request, HttpServletResponse response)
{
int a = Integer.parseInt(request.getParameter("txtnum1"));
int b = Integer.parseInt(request.getParameter("txtnum2"));
Hashtable<String, Integer> ht = new Hashtable<>();
ht.put("num1",a);
ht.put("num2",b);
Set<Map.Entry<String,Integer>> se = ht.entrySet();
int sum=0;
for(Map.Entry<String, Integer> me:se)
{
sum = sum+me.getValue();
}
int c= sum;
return new ModelAndView("add","key","result is "+c);
}
}
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