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);
    }
}

View Code

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 javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet("/page2")
public class Page2 extends HttpServlet {
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        HttpSession session = request.getSession();

        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("page3");
        out.println("<form action="" + url + "" method="get">");
        System.out.println("第一个sessionId: " + session.getId());
        session.setAttribute("p1q1", request.getParameter("p1q1"));
        session.setAttribute("p1q2", request.getParameter("p1q2"));
        out.println("問題三：<input type='text' name='p2q1'> <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);
    }
}

View Code

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 javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet("/page3")
public class Page3 extends HttpServlet {
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        HttpSession session = request.getSession();

        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>");

        System.out.println("第二个sessionId: " + session.getId());
        out.println(session.getAttribute("p1q1") + "<br>");
        out.println(session.getAttribute("p1q2") + "<br>");
        out.println(request.getParameter("p2q1") + "<br>");

        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);
    }
}

View Code

测试地址

　　127.0.0.1:8080/page1