url override and HttpSession implements session for form-白红宇

url override and HttpSession implements session for form

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发布时间：2019-06-08

本文共 2555 字，大约阅读时间需要 8 分钟。

url 重写结合HttpSession实现会话管理之 form 提交

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("/questionnaire")public class Questionnaire 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("");        out.println("");        out.println("");        out.println("
     ");        out.println("问卷调查");        out.println("");        out.println("");        String page = request.getParameter("page");        if(page == null) {                   // 第一頁問卷            out.println("
     
      ");            out.println("問題一：
      
      
");            out.println("問題二：
      
      
");            out.println("
      ");            out.println("
     
");        }        else if("page2".equals(page)) {    // 第二頁問卷            /**             * 下面这三行代码的顺序不可变        　　*/            HttpSession session = request.getSession();            String url = response.encodeURL("questionnaire");            out.println("
     
      ");            session.setAttribute("p1q1", request.getParameter("p1q1"));            session.setAttribute("p1q2", request.getParameter("p1q2"));            out.println("問題三：
       
      
");            out.println("
      ");            out.println("
     
");        }        else if("finish".equals(page)) {    // 最後答案收集            HttpSession session = request.getSession();            out.println(session.getAttribute("p1q1") + "
");            out.println(session.getAttribute("p1q2") + "
");            out.println(request.getParameter("p2q1") + "
");        }        out.println("");        out.println("");        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);    }}