期末考试题解5

web.xml

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<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
  <welcome-file-list>
    <welcome-file>login.html</welcome-file>
  </welcome-file-list>
</web-app>

登录界面.html

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>登录</title>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            background-color: #f4f4f4;
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }

        #loginDiv {
            background-color: #fff;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
            width: 300px;
        }

        #loginMsg {
            text-align: center;
            color: #333;
            margin-bottom: 20px;
        }

        input[type="text"],
        input[type="password"] {
            width: 100%;
            padding: 10px;
            margin-bottom: 10px;
            border: 1px solid #ddd;
            border-radius: 4px;
        }

        input[type="submit"] {
            width: 100%;
            padding: 10px;
            background-color: #5cb85c;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
        }

        input[type="submit"]:hover {
            background-color: #4cae4c;
        }

        #subDiv {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        a {
            color: #337ab7;
            text-decoration: none;
        }

        a:hover {
            text-decoration: underline;
        }
    </style>
</head>

<body>
<div id="loginDiv">
    <form action="/EndTest/LoginServlet" method="post" id="form">
        <h1 id="loginMsg">欢迎使用差旅费报销管理信息系统</h1>
        <p>用户名:<input id="UserID" name="UserID" type="text"></p>
        <p>密码:<input id="Password" name="Password" type="password"></p>
        <div id="subDiv">
            <input type="submit" class="button" value="登录">
            <a href="register.html">没有账号？点击注册</a>
        </div>
    </form>
</div>
</body>

</html>

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>欢迎注册</title>
</head>
<body>

<div class="form-div">
    <div class="reg-content">
        <h1>欢迎注册</h1>
        <a href="login.html">已有帐号？登录</a>
    </div>
    <form id="reg-form" action="/EndTest/RegisterServlet" method="post">

        <table>

            <tr>
                <td>用户名</td>
                <td class="inputs">
                    <input name="username" type="text" id="username">
                    <br>
                    <span id="username_err" class="err_msg" style="display: none">用户名不太受欢迎</span>
                </td>

            </tr>

            <tr>
                <td>密码</td>
                <td class="inputs">
                    <input name="password" type="password" id="password">
                    <br>
                    <span id="password_err" class="err_msg" style="display: none">密码格式有误</span>
                </td>
            </tr>

        </table>

        <div class="buttons">
            <input value="注 册" type="submit" id="reg_btn">
        </div>
        <br class="clear">
    </form>

</div>
</body>
</html>

LoginServlet

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package com.QixunQiu.web;

import com.QixunQiu.pojo.User;
import com.QixunQiu.service.UserService;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
    private UserService userService = new UserService();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        String UserID = request.getParameter("UserID");
        String Password = request.getParameter("Password");
        User user =userService.selectUser(UserID, Password);
        response.setContentType("text/html;charset=utf-8");
        PrintWriter writer = response.getWriter();
        //3. 判断user释放为null
        if(user != null){
            // 登陆成功
            writer.write("登陆成功");
            HttpSession session = request.getSession();
            session.setAttribute("user", user);
            request.getRequestDispatcher("/index.jsp").forward(request,response);
        }else {
            // 登陆失败
            writer.write("登陆失败");
        }
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doGet(request, response);
    }
}

RegisterServlet

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package com.QixunQiu.web;

import com.QixunQiu.pojo.User;
import com.QixunQiu.service.UserService;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;

@WebServlet("/RegisterServlet")
public class RegisterServlet extends HttpServlet {
    private UserService userService = new UserService();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        String userID = generateID();
        User user = new User();
        user.setUsername(username);
        user.setPassword(password);
        user.setUserID(userID);
        userService.addUser(user);
        request.getRequestDispatcher("/login.html").forward(request, response);

    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doGet(request, response);
    }

    private int sequenceNumber = 1;

    public synchronized String generateID() {
        // 获取当前日期
        Date now = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy");
        String dateStr = sdf.format(now);

        // 读取或初始化sequenceNumber
        if (sequenceNumber == 1) {
            File file = new File("sequenceNumberHouse.txt");
            if (file.exists()) {
                try {
                    BufferedReader reader = new BufferedReader(new FileReader(file));
                    String line = reader.readLine();
                    sequenceNumber = Integer.parseInt(line);
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        // 组合房产编号
        String sequenceStr = String.format("%04d", sequenceNumber++);
        String houseID = dateStr + sequenceStr;

        // 更新sequenceNumber到文件
        try {
            BufferedWriter writer = new BufferedWriter(new FileWriter("sequenceNumberHouse.txt"));
            writer.write(String.valueOf(sequenceNumber));
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return houseID;
    }
}