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Java web 简单是cookie、session、application使用

2014-08-27 19:44 399 查看

jsp页面

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%
Cookie[] cookies=request.getCookies();
String uname="";

if(cookies!=null){
for(Cookie c :cookies){
if(c.getName().equals("myCookie")){
uname=c.getValue();

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

<title>My JSP 'login.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>
<form action="/MVCDemo/servlet/LoginServlet" method="post">
用户名：<input name="uname" type="text" value="<%=uname %>"><br/>
密码：<input name="upwd" type="password"/><br/>
<input type="submit" value="登陆"/>

</body>
</html>

servlet页面

package com.neusoft.controller;

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

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

public class LoginServlet extends HttpServlet {

/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String uname=request.getParameter("uname");

String upwd=request.getParameter("upwd");

if(uname.equals("zhangsan")&&upwd.equals("123")){
ServletContext application=this.getServletContext();
HttpSession session=request.getSession();

Cookie c=new Cookie("myCookie",uname);
c.setMaxAge(3600);
c.setPath("/");
response.addCookie(c);

//作用域不同
//request在相同的请求中有效
//session在同一次回话中有效

if(application.getAttribute("count")!=null){
Integer count=(Integer)application.getAttribute("count");
count++;
application.setAttribute("count", count);

}else{
int count=1;
application.setAttribute("count", count);
}

session.setAttribute("uname", uname);
//request.setAttribute("uname", uname);

response.sendRedirect("/MVCDemo/error404.jsp");
}

}

/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

doGet(request, response);
}

}

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