代碼
package controller;
import java.io.IOException;
import java.sql.SQLException;
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;
import javax.servlet.http.HttpSession;
import domain.User;
import model.UserModel;
/**
* Servlet implementation class LoginServlet
*/
@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
? ? request.setCharacterEncoding("UTF-8");
? try {
? String username = request.getParameter("username");
? String password = request.getParameter("password");
? User user = new User();
? user.setUsername(username);
? user.setPassword(password);
? String checkcode1 = request.getParameter("checkckcode");
? String checkcode2 = (String) request.getSession().getAttribute("checkcode");
? request.getSession().removeAttribute("checkcode");
? if(!checkcode1.equalsIgnoreCase(checkcode2)) {
? ? request.setAttribute("msg", "驗(yàn)證碼輸入錯(cuò)誤!");
? ? request.getRequestDispatcher("/login.jsp").forward(request, response);
? ? return;
? }
}
? UserModel userModel = new UserModel();
? User existUser = userModel.login(user);
? if(existUser == null) {
? ? //登錄失敗
? ? request.setAttribute("msg", "用戶名或密碼錯(cuò)誤!");
? ? request.getRequestDispatcher("/login.jsp").forward(request, response);
? }else {
? ? //登錄成功
? ? HttpSession session = request.getSession();
? ? session.setAttribute("existUser", existUser);
? ? String remember = request.getParameter("remember");
? ? if("true".equals(remember)) {
? ? Cookie cookie = new Cookie("remember",existUser.getUsername());
? ? cookie.setPath("/web03");
? ? cookie.setMaxAge(60*60*24);
? ? response.addCookie(cookie);
? ? }
? ? response.sendRedirect("/web03/success.jsp");
? }
? } catch (SQLException e) {
? e.printStackTrace();
? throw new RuntimeException();
? }
?
}
?
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
? doGet(request, response);
}
}
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
? ? pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
<script type="text/javascrpit">
? function changeImg(){
document.getElementById("img1").src = "/web03/CheckImgServler?time" + new Date().getTime();
}
</script>
</head>
<%
? String msg = "";
? if(request.getAttribute("msg") !=null){
? ? msg = (String)request.getAttribute("msg");
? }
%>
<body>
<h1>登錄頁(yè)</h1>
<from action="/web03/LoginServlet" method="post">
<h3><font color="red"><%= msg %></h3>
<table border="1" width="400">
? ? <tr>
? ? <td>用戶名</td>
? ? <ts><input type="text" name="username" value="${ cookie.remember.value} }"></ts>
? ? </tr>
? ? <tr>
? ? <td>密碼</td>
? ? <td><input type="password" name="password"></td>
? ? </tr>
? ? <tr>
? ? <td>驗(yàn)證碼</td>
? ? <td>
? ? <input type="text" name="checkcode" size="6">
? ? < img id="img1" src="/web03/CheckImgServelt">
? ? < a href=" " onclick="changeImg">看不清，換一張</ a>
? ? </tr>
? ? </table>
</body>
</html>
