cookie的使用
链接: https://pan.baidu.com/s/188chZLe-56VFzg7UvkZKUA
提取码: jvwb 复制这段内容后打开百度网盘手机App，操作更方便哦
一、效果图
二、相关代码
HTML代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>登录界面</title>
<script type="text/javascript" src="script/login.js"></script>
<link href="css/login.css" type="text/css" rel="stylesheet">
</head>
<body>
<div id="page">
<div id="page_head">
<div id="logo">
<img src="rsc\login_logo.png"/>
</div>
</div>
<div id="page_body">
<div id="login">
<div id="loginTitle">
<b>账号登录</b>
</div>
<form action="TestServlet" id="loginForm">
<div id="tip">请填写用户名</div>
<div class="textitem_count">
<input style="width:320px;height:30px" name="input_user" type="text" placeholder="用户名">
</div>
<div class="textitem_pwd">
<input style="width:320px;height:30px" name="input_password" type="password" placeholder="密码">
</div>
<div style="position:absolute;left:30px;top:220px;width:320px">
<sqan style="color:red;float:left;">学生选择@stu.swpu.edu.cn</sqan>
<a href="#" style="float:right;">忘记密码</a>
</div>
<div style="position: absolute; left:30px; top:260px;width: 320px">
<input onclick="fnLogin()" style="float:right;background:url(rsc/login_btn.jpg);" class="btn" type="submit" value="登 录" />
</div>
</form>
</div>
</div>
<div id="page_foot">西南石油大学</div>
</div>
</body>
</html>
HttpServlet：
package swpu.com;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/TestServlet")
public class TestServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
String sql = null;
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
boolean isLoing=false;
/**
* @see HttpServlet#HttpServlet(g)
*/
public TestServlet() {
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.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
String userName = request.getParameter("input_user");
String userPsw = request.getParameter("input_password");
// 判读以前是否登录且未过期
Cookie[] cookies = request.getCookies();
String value = "";
if(cookies!=null)
{
for(Cookie cookie:cookies)
{
// 已登录且记住密码 跳转到首页
if(cookie.getName().equals("remmberme"))
{
response.sendRedirect("/shouye.html");
return;
}
}
}
//连接数据库检测用户名和密码
try {
//连接数据库
Class.forName("com.mysql.jdbc.Driver");
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
conn=DriverManager.getConnection("jdbc:mysql://localhost/workdb?user=root&password=root&serverTimezone=UTC");
stmt=conn.createStatement();
sql="select userPWD from login where userID='"+userName+"'";
rs=stmt.executeQuery(sql);
if(rs.next()) {
//获取输入用户名的密码进行检验，若与输入的一致则isLogin置为true，反之置false
String pw=rs.getString("userPWD");
if (pw.equals(userPsw)) {
isLoing=true;
}else {
isLoing=false;
}
}else {
//若未查询到用户的存在也置为false
isLoing=false;
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally {
try {
if(rs!=null)
rs.close();
if(stmt!=null)
stmt.close();
if(conn!=null)
conn.close();
} catch (Exception e2) {
// TODO: handle exception
e2.printStackTrace();
}
}
if(isLoing){
response.getWriter().write("登陆成功");
response.getWriter().write("</br>");
response.getWriter().write("用户名：" + userName);
response.getWriter().write("</br>");
response.getWriter().write("密码：" + userPsw);
//登录成功后创建一个新的cookie
Cookie cookie = new Cookie("remmberme","1");
cookie.setMaxAge(30*34*60*60);
// 记住密码
response.addCookie(cookie);
response.sendRedirect("/shouye.html");
return;
}
else{
response.getWriter().write("登录失败！");
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
