JSP登錄中Session的用法。，具體如下：
登錄頁面
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>Insert title here</title></head><body> <div style="float:left;margin-top:100px;margin-left:200px;width:400px;height:300px;background:gray;"> <form action="IndexServlet" method="post"> <div style="float:left;width:400px;height:30px;background:gray;margin-top:50px"> <div style="margin-left:70px;float:left;line-height:30px">賬號:</div><input style="disply:block;float:left;width:200px;height:30px;border:none;" type="text" name="user"/> </div> <div style="float:left;width:400px;height:30px;background:gray;margin-top:50px"> <div style="margin-left:70px;float:left;line-height:30px">密碼:</div><input style="disply:block;float:left;width:200px;height:30px;border:none;" type="text" name="password"/> </div> <div style="float:left;margin-top:50px;width:400px;height:30px;background:gray;"> <input style="float:left;width:60px;height:30px;margin-left:170px;border:none;" type="submit" name="ok" value="登錄"/> </div> </form> </div></body></html>
檢測賬號密碼以及設置session的IndexServlet
import java.io.IOException;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;/** * Servlet implementation class IndexServlet */@WebServlet("/IndexServlet")public class IndexServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public IndexServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub response.getWriter().append("Served at: ").append(request.getContextPath()); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub request.setCharacterEncoding("utf-8"); String user = request.getParameter("user"); String password = request.getParameter("password"); String path = request.getContextPath(); HttpSession session=request.getSession(); if ("1".equals(user) && "1".equals(password)) { session.setAttribute("name", user); response.sendRedirect(path + "/success.jsp"); }else{ response.sendRedirect(path + "/Index.jsp"); } } }
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