package com.imooc.servlet;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 * Servlet implementation class SumServlet

 */

@WebServlet("/SumServlet")

public class SumServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

    /**

     * @see HttpServlet#HttpServlet()

     */

    public SumServlet() {

        super();

        // TODO Auto-generated constructor stub

    }

/**

* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

*/

@Override

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

String number=request.getParameter("number");

int n=Integer.parseInt(number);

int sum=0;

for(int i=1;i<=n;i++){

sum=sum+i;

}

String num=Integer.toString(sum);

request.setAttribute("sum", num);

request.getRequestDispatcher("/sum2").forward(request, response);

}

}