老师这样写可以吗,还有如何使用响应重定向写这个作业呢

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="/Servlet_JSP_2/direct/SC">
<input name="num" value="请输入100以内的数字" style="box-shadow: 1px 1px 1px #000 inset; color:gray" border=1px/>
<input type="submit" value="求累加和"/>
</form>
</body>
</html>
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 Servlet_Request1
 */
@WebServlet("/direct/SC")
public class Servlet_Count extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Servlet_Count() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		int num = Integer.parseInt(request.getParameter("num"));
		int sum=0;
		for(int i = 1;i <= num;i++) {
			sum+=i;
		}
		request.setAttribute("sum", sum);
		request.getRequestDispatcher("/direct/SS").forward(request,response);
	
		
	}

}
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 Servlet_Request2
 */
@WebServlet("/direct/SS")
public class Servlet_Show extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Servlet_Show() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.getWriter().println((int)request.getAttribute("sum"));
	}

}

成为拉里 2019-07-22

源自：Servlet与JSP进阶 2-6 自由编程