JSP登录中Session的用法

转载于 2021-07-07 14:19:00 发布 · 223 阅读

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原文链接：https://blog.youkuaiyun.com/qq_38006520/article/details/81514999

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本文介绍了一个使用Java Servlet实现的登录页面，包括账号密码输入验证，Session管理和登录后的跳转。重点在于演示如何在Servlet中处理表单提交，设置Session并根据输入验证跳转至不同页面。

转载：https://blog.youkuaiyun.com/qq_38006520/article/details/81514999

登录页面

<%@ 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">账号:</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">密码:</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="登录"/>
       </div>
       </form>
   </div>
</body>
</html>

检测账号密码以及设置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");
       }
   }

}
成功登录页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
   String path = request.getContextPath();
%>
<%
   Object name = session.getAttribute("name");
   if(name==null){
       response.sendRedirect(path+"/Index.jsp");
   }
%>
<html>
   <head>
       <title>成功页面</title>
   </head>
   <body>
       恭喜你，骚年，<%=session.getAttribute("name") %>,成功登陆了！
       <a href="out.jsp">注销</a>
   </body>
</html>

注销功能的jsp

<%@ 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>
   <%
       String path = request.getContextPath();
   %>
   <%
        session.removeAttribute("name");
        response.sendRedirect(path+"/Index.jsp");
%>
</body>
</html>