url override and HttpSession implements session for real
阿新 • • 發佈：2018-12-02
無論cookie有沒有禁用，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;View Codeimport 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>問卷調查</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); } }
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>問卷調查</title>"); out.println("</head>"); out.println("<body>"); String url = response.encodeURL("page3"); out.println("<form action=\"" + url + "\" method=\"get\">"); System.out.println("第一個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>問卷調查</title>"); out.println("</head>"); out.println("<body>"); System.out.println("第二個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
測試地址
127.0.0.1:8080/page1