jsp登录中session的用法

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>

jsp登录中session的用法

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