url override and HttpSession implements session for real

无论cookie有没有禁用，HttpSession都有效
package com.test;


import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet("/page1")
public class Page1 extends HttpServlet {
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");

        PrintWriter out = response.getWriter();
        out.println("<!DOCTYPE html>");
        out.println("<html>");
        out.println("<head>");
        out.println("<meta charset='UTF-8'>");
        out.println("<title>问卷调查</title>");
        out.println("</head>");
        out.println("<body>");

        String url = response.encodeURL("page2");
        out.println("<form action=\"" + url + "\" method=\"get\">");
        out.println("問題一：<input type='text' name='p1q1'><br>");
        out.println("問題二：<input type='text' name='p1q2'><br>");
        out.println("<input type='submit' name='page' value='提交'>");
        out.println("</form>");
        out.println("</body>");
        out.println("</html>");
        out.close();
    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }
}
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