<%@ page language="java" import="java.util.*" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="/day_11/Aservlet" method="post">
    数据A：<input type="text" name="data1"/><br/>
    数据B：<input type="text" name="data2"/><br/>
    <input type="submit" value="提交"/><hr/>
</form>
</body>
</html>
<%@ page language="java" import="java.util.*"contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<% 
Integer c = (Integer)request.getAttribute("aaa");
%>
<%=c %>
</body>
</html>
package cn.code.jia;

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

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        String s1 = request.getParameter("data1");
        String s2 = request.getParameter("data2");
        int a =Integer.parseInt(s1);
        int b =Integer.parseInt(s2);
        int sum=a+b;
        request.setAttribute("aaa", sum);
        request.getRequestDispatcher("/jsps/result.jsp").forward(request, response);
    }

}