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session在实际管理中的应用

2015-08-31 20:04 309 查看

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>

</head>

<body>
<form action="/test/userloginservlet" method="post">
username：<input type="text" name="username"><br>
password:<input type="password" name="password"><br>
authority:
<select name="authority">
<option value="1">common user</option>
<option value="2">administrator</option>
</select>
<br>

<input type="submit" value="submit">

</form>
</body>
</html>

package com.hpu.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.hpu.javabean.User;

public class userloginservlet extends HttpServlet
{

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
User user=new User();

HttpSession session=request.getSession();

String username=request.getParameter("username");
String password=request.getParameter("password");
String authority=request.getParameter("authority");

if("1".equals(authority))
{
//登陆的是普通用户
if("zhangsan".equals(username)&&"123".equals(password))
{

//将用户的信息放在session里面
user.setUsername(username);
user.setPassword(password);
user.setAuthority(authority);

session.setAttribute("user", user);

request.getRequestDispatcher("session/index.jsp").forward(request,response);

}
else
{
RequestDispatcher rd=request.getRequestDispatcher("session/UserLogin.jsp");

rd.forward(request, response);
}
}

else if("2".equals(authority))
{
if("lisi".equals(username)&&"456".equals(password))
{

//登陆的是系统管理员

user.setUsername(username);
user.setPassword(password);
user.setAuthority(authority);
session.setAttribute("user", user);

request.getRequestDispatcher("session/index.jsp").forward(request,response);

}
else
{
RequestDispatcher rd=req
4000
uest.getRequestDispatcher("session/UserLogin.jsp");

rd.forward(request, response);
}
}
//登陆失败
else
{
RequestDispatcher rd=request.getRequestDispatcher("session/UserLogin.jsp");

rd.forward(request, response);
}

}

}

<%@ page language="java" import="com.hpu.javabean.User" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->

</head>

<body>

<a herf="QueryServlet">query</a><br>

<%if(((User)session.getAttribute("user")).getAuthority().equals("2")){%>
<a herf="UpdateServlet">update</a>
</body>
<%} %>

</html>

package com.hpu.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.hpu.javabean.User;

public class UpdateServlet extends HttpServlet
{

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
HttpSession session=request.getSession();

if(null == session.getAttribute("user"))
{
response.sendRedirect("session/UserLogin.jsp");
return;
}

User user=(User)session.getAttribute("user");

if("1".equals(user.getAuthority()))
{
System.out.println("shibai");
}
else
{
System.out.println("chenggong");
}

}

}

package com.hpu.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class QueryServlet extends HttpServlet
{

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
HttpSession session=request.getSession();

if(null == session.getAttribute("user"))
{
response.sendRedirect("session/UserLogin.jsp");
return;
}

}

}

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