老师你好，帮忙看一看有需要改进的没

来源：2-6 自由编程

ByteDancer07

2020-02-15 16:23:37

HTML

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
<script type="text/javascript" scr="checkNum.js"></script>
</head>
<body>
	<form action="/ServletPro/num">
		<input type = "text" id="num" name="num" placeholder="请输入100以内的数字">
		<input type="submit" value="求累加和" onclick="checkNum()" >
	</form>
</body>
</html>

计算累积和的Servlet页面

package com.kai.servlet.pracrtise;

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

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		int sum=0;
		
		int num =Integer.parseInt(request.getParameter("num"));
		
		for(int i=0;i<=num;i++) {
			sum=sum+i;
		}
		
		request.setAttribute("sum", sum);
		
		request.getRequestDispatcher("/sum").forward(request, response);
		
		System.out.println(sum);
		
	}
}

展示累积和

package com.kai.servlet.pracrtise;

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

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		int sum=0;
		
		int num =Integer.parseInt(request.getParameter("num"));
		
		for(int i=0;i<=num;i++) {
			sum=sum+i;
		}
		
		request.setAttribute("sum", sum);
		
		request.getRequestDispatcher("/sum").forward(request, response);
		
		System.out.println(sum);
		
	}
}

还要个问题就是，应该怎么校验输入的数字是在0-100？

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