url override and HttpSession implements session for real
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);
}
}
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);
}
}
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);
}
}
测试地址
127.0.0.1:8080/page1
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