javaweb版本的答答租车系统（源代码三）@慕课网原创_慕课网

上接javaweb版本的答答租车系统（源代码二）
这里是我的web.xml配置信息

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>CarSystem</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
    <description>登录</description>
    <servlet-name>LoginServlet</servlet-name>
    <servlet-class>com.david.Servlet.LoginServlet</servlet-class>
  </servlet>
  <servlet>
    <description>退出</description>
    <servlet-name>ExitServlet</servlet-name>
    <servlet-class>com.david.Servlet.ExitServlet</servlet-class>
  </servlet>
  <servlet>
    <description>商品</description>
    <servlet-name>CommodityServlet</servlet-name>
    <servlet-class>com.david.Servlet.CommodityServlet</servlet-class>
  </servlet>
  <servlet>
    <description>租车</description>
    <servlet-name>RentCarServlet</servlet-name>
    <servlet-class>com.david.Servlet.RentCarServlet</servlet-class>
  </servlet>
  <servlet>
    <description>用户账单</description>
    <servlet-name>UserBillServlet</servlet-name>
    <servlet-class>com.david.Servlet.UserBillServlet</servlet-class>
  </servlet>
  <servlet>
    <description>退租</description>
    <servlet-name>SurrenderServlet</servlet-name>
    <servlet-class>com.david.Servlet.SurrenderServlet</servlet-class>
  </servlet>
  <servlet>
    <description>统计用户租车次数和总租金</description>
    <servlet-name>SettleAccountsServlet</servlet-name>
    <servlet-class>com.david.Servlet.SettleAccountsServlet</servlet-class>
  </servlet>
  <servlet>
    <description>登记出租</description>
    <servlet-name>RegisterServlet</servlet-name>
    <servlet-class>com.david.Servlet.RegisterServlet</servlet-class>
  </servlet>
  <servlet>
    <description>注册</description>
    <servlet-name>RegServlet</servlet-name>
    <servlet-class>com.david.Servlet.RegServlet</servlet-class>
  </servlet>
  <servlet>
    <description>修改资料</description>
    <servlet-name>ModifyServlet</servlet-name>
    <servlet-class>com.david.Servlet.ModifyServlet</servlet-class>
  </servlet>
  <servlet>
    <description>跳转登记租车页面</description>
    <servlet-name>RegisterJumpServlet</servlet-name>
    <servlet-class>com.david.Servlet.RegisterJumpServlet</servlet-class>
  </servlet>
  <servlet>
    <description>跳转注册页面</description>
    <servlet-name>RegJumpServlet</servlet-name>
    <servlet-class>com.david.Servlet.RegJumpServlet</servlet-class>
  </servlet>
  <servlet>
    <description>跳转修改资料页面</description>
    <servlet-name>ModifyJumpServlet</servlet-name>
    <servlet-class>com.david.Servlet.ModifyJumpServlet</servlet-class>
  </servlet>
  <servlet>
    <description>导航栏：注册</description>
    <servlet-name>GpsRegServlet</servlet-name>
    <servlet-class>com.david.Servlet.GpsRegServlet</servlet-class>
  </servlet>
  <servlet>
    <description>导航栏：登录</description>
    <servlet-name>GpsLoginServlet</servlet-name>
    <servlet-class>com.david.Servlet.GpsLoginServlet</servlet-class>
  </servlet>
  <servlet>
    <description>导航栏：用户信息</description>
    <servlet-name>GpsUserinfoServlet</servlet-name>
    <servlet-class>com.david.Servlet.GpsUserinfoServlet</servlet-class>
  </servlet>
  <servlet>
    <description>导航栏：商品信息</description>
    <servlet-name>GpsCommodityServlet</servlet-name>
    <servlet-class>com.david.Servlet.GpsCommodityServlet</servlet-class>
  </servlet>
  <servlet>
    <description>导航栏：管理员信息</description>
    <servlet-name>GpsAdmininfoServlet</servlet-name>
    <servlet-class>com.david.Servlet.GpsAdmininfoServlet</servlet-class>
  </servlet>
  <servlet>
    <description>导航栏：修改资料</description>
    <servlet-name>GpsModifyServlet</servlet-name>
    <servlet-class>com.david.Servlet.GpsModifyServlet</servlet-class>
  </servlet>
  <servlet>
    <description>导航栏：登记出租</description>
    <servlet-name>GpsRegisterServle</servlet-name>
    <servlet-class>com.david.Servlet.GpsRegisterServle</servlet-class>
  </servlet>
  <servlet>
    <description>导航栏：用户账单</description>
    <servlet-name>GpsUserbillServlet</servlet-name>
    <servlet-class>com.david.Servlet.GpsUserbillServlet</servlet-class>
  </servlet>
  <servlet>
    <description>导航栏：用户结账</description>
    <servlet-name>GpsSettleaccountsServlet</servlet-name>
    <servlet-class>com.david.Servlet.GpsSettleaccountsServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>GpsSettleaccountsServlet</servlet-name>
    <url-pattern>/Gpssettleaccounts.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>GpsUserbillServlet</servlet-name>
    <url-pattern>/Gpsuserbill.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>GpsRegisterServle</servlet-name>
    <url-pattern>/Gpsregister.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>GpsModifyServlet</servlet-name>
    <url-pattern>/Gpsmodify.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>GpsAdmininfoServlet</servlet-name>
    <url-pattern>/Gpsadmininfo.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>GpsCommodityServlet</servlet-name>
    <url-pattern>/Gpscommodity.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>GpsUserinfoServlet</servlet-name>
    <url-pattern>/Gpsuserinfo.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>GpsLoginServlet</servlet-name>
    <url-pattern>/Gpslogin.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>GpsRegServlet</servlet-name>
    <url-pattern>/Gpsreg.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>RegServlet</servlet-name>
    <url-pattern>/reg.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>LoginServlet</servlet-name>
    <url-pattern>/login.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>ExitServlet</servlet-name>
    <url-pattern>/logout.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>CommodityServlet</servlet-name>
    <url-pattern>/commodity.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>RentCarServlet</servlet-name>
    <url-pattern>/rentcarcommodity.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>UserBillServlet</servlet-name>
    <url-pattern>/userbill.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>SurrenderServlet</servlet-name>
    <url-pattern>/billsettleaccounts.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>SettleAccountsServlet</servlet-name>
    <url-pattern>/settleaccounts.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>RegisterServlet</servlet-name>
    <url-pattern>/register.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>ModifyServlet</servlet-name>
    <url-pattern>/modify.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>RegisterJumpServlet</servlet-name>
    <url-pattern>/registerjump.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>RegJumpServlet</servlet-name>
    <url-pattern>/regjump.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>ModifyJumpServlet</servlet-name>
    <url-pattern>/modifys.html</url-pattern>
  </servlet-mapping>
  <!-- 过滤器 -->
  <filter>
    <!-- 过滤器名称 -->
    <filter-name>CharacterEncodingFilter</filter-name>
    <!-- 过滤器类 -->
    <filter-class>com.david.code.CharacterEncodingFilter</filter-class>
    <!-- 初始化参数 -->
    <init-param>
      <!-- 参数名称 -->
      <param-name>encoding</param-name>
      <!-- 参数值 -->
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <!-- 过滤器映射 -->
  <filter-mapping>
    <!-- 过滤器名称 -->
    <filter-name>CharacterEncodingFilter</filter-name>
    <!-- URL模式 -->
    <url-pattern>/*</url-pattern>
    <!-- 调度 -->
    <dispatcher>REQUEST</dispatcher>
    <!-- 调度 -->
    <dispatcher>FORWARD</dispatcher>
  </filter-mapping>
</web-app>

项目开头我做了一个欢迎页面index.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>'index.jsp'</title>
</head>
<body>
    <jsp:forward page="login.jsp"></jsp:forward>
</body>
</html>

进入项目后会跳转到登录页面login.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>用户登录</title>
<script type="text/javascript">
    //登录前验证
    function login(form){
        if(form.username.value == " "){
            alert("用户名不能为空！");
            return false;
        }
        if(form.password.value == " "){
            alert("密码不能为空！");
            return false;
        }
    }
</script>
</head>
<body>
    <div align="center">
        <div>
            <table align="center" border="0" width="800">
                <tr>
                    <td align="center" colspan="8"><h2>欢迎光临答答租车系统</h2></td>
                </tr>
                <tr>
                    <td><a href="Gpsreg.html">用户注册</a></td>
                    <td><a href="Gpslogin.html">用户登录</a></td>
                    <td><a href="Gpsuserinfo.html">用户信息</a></td>
                    <td><a href="Gpscommodity.html">商品信息</a></td>
                    <td><a href="Gpsadmininfo.html">管理员信息</a></td>
                    <td><a href="Gpsmodify.html">修改资料</a></td>
                    <td><a href="Gpsregister.html">登记出租</a></td>
                    <td><a href="Gpsuserbill.html">用户账单</a></td>
                </tr>
            </table>
        </div>
        <br><hr><hr><br>
        <%
            //获取提示信息
            String info = (String)request.getAttribute("info");
            //如果提示信息不为空则输出提示信息
            if(info != null){
                out.println(info);
            }
        %>
        <div>
            <form action="login.html" method="post" onsubmit="retrun login(this)">
                <table align="center" border="0" width="400">
                    <tr><td align="center" colspan="2"><h3>用户登录</h3></td></tr>
                    <tr>
                        <td align="left">用户名：</td>
                        <td><input type="text" name="username"></td>
                    </tr>
                    <tr>
                        <td align="left">密     码：</td>
                        <td><input type="text" name="password"></td>
                    </tr>
                    <tr>
                        <td colspan="2" align="center">
                            <a href="regjump.html"><input type="button" value="注册"></a>
                            <input type="submit" value="登录">
                            <input type="reset" value="重置">
                        </td>
                    </tr>
                </table>
            </form>
        </div>
    </div>
</body>
</html>

登录页面可以注册新用户，点击注册按钮，通过web.xml中配置好的servlet信息，找到并执行RegJumpServlet

package com.david.Servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 跳转注册页面 servlet
 * Servlet implementation class RegJumpServlet
 */
public class RegJumpServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public RegJumpServlet() {
        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
        this.doPost(request, response);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        request.getRequestDispatcher("reg.jsp").forward(request, response);
    }

}

然后会跳转到reg.jsp页面注册

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>用户注册</title>
<script type="text/javascript">
    function reg(form){
        if(form.username.value == " "){
            alert("用户名不能为空！");
            return false;
        }
        if(form.password.value == " "){
            alert("密码不能为空！");
            return false;
        }
        if(form.sex.value == " "){
            alert("性别不能为空！");
            return false;
        }
        if(form.tal.value == " "){
            alert("联系电话不能为空！");
            return false;
        }
        if(form.email.value == " "){
            alert("电子邮箱不能为空！"); 
            return false;
        }
    }
</script>
</head>
<body>
    <div align="center">
        <div>
            <table align="center" border="0" width="800">
                <tr>
                    <td align="center" colspan="8"><h2>欢迎光临答答租车系统</h2></td>
                </tr>
                <tr>
                    <td><a href="Gpsreg.html">用户注册</a></td>
                    <td><a href="Gpslogin.html">用户登录</a></td>
                    <td><a href="Gpsuserinfo.html">用户信息</a></td>
                    <td><a href="Gpscommodity.html">商品信息</a></td>
                    <td><a href="Gpsadmininfo.html">管理员信息</a></td>
                    <td><a href="Gpsmodify.html">修改资料</a></td>
                    <td><a href="Gpsregister.html">登记出租</a></td>
                    <td><a href="Gpsuserbill.html">用户账单</a></td>
                </tr>
            </table>
        </div>
        <br><hr><hr><br>
        <div>
            <form action="reg.html" method="post" onclick="return reg(this)">
                <table>
                    <tr>
                        <td align="center" colspan="2"><h3>欢迎注册,请仔细填写下面的资料</h3></td>
                    </tr>
                    <tr>
                        <td align="center">用户名：</td>
                        <td><input type="text" name="username"></td>
                    </tr>
                    <tr>
                        <td align="center">密码：</td>
                        <td><input type="text" name="password"></td>
                    </tr>
                    <tr>
                        <td align="center">性别：</td>
                        <td><input type="text" name="sex"></td>
                    </tr>
                    <tr>
                        <td align="center">联系电话：</td>
                        <td><input type="text" name="tel"></td>
                    </tr>
                    <tr>
                        <td align="center">电子邮箱：</td>
                        <td><input type="text" name="email"></td>
                    </tr>
                    <tr>
                        <td align="center" colspan="2">
                            <input type="submit" value="注册">
                            <input type="reset" value="重置">
                        </td>
                    </tr>
                </table>
            </form>
        </div>
    </div>
</body>
</html>

这里用的是表单提交功能，填写完资料后点击注册按钮，会将资料表单通过web.xml中配置好的信息找到并执行RegServlet

package com.david.Servlet;

import java.io.IOException;

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

import com.david.Account;
import com.david.User;
import com.david.dao.AccountDao;
import com.david.dao.UserDao;

/**
 * 注册 servlet
 * Servlet implementation class RegServlet
 */
public class RegServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public RegServlet() {
        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
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        //获取用户名
        String username = request.getParameter("username");
        //获取用户密码
        String password = request.getParameter("password");
        //获取性别
        String sex = request.getParameter("sex");
        //获取联系电话
        String tel = request.getParameter("tel");
        //获取电子邮箱
        String email = request.getParameter("email");
        //实例化UserDao对象
        UserDao userDao = new UserDao();
        //实例化AccountDao对象
        AccountDao accountDao = new AccountDao();
        //调用方法判断用户在数据库中是否存在
        if(username != null && !username.isEmpty()){
            if(userDao.userIsExsit(username)){
                //实例化一个用户对象
                User user = new User();
                //对用户对象进行赋值
                user.setUsername(username);
                user.setPassword(password);
                user.setSex(sex);
                user.setTel(tel);
                user.setEmail(email);
                user.setCompetence("普通用户");
                //保存用户注册信息
                userDao.saveUser(user);
                //定义变量保存查询到的用户id
                int userid = userDao.userid(username);
                //实例化一个账户对象
                Account account = new Account();
                //对账户对象进行赋值
                account.setUserid(userid);
                account.setMoney((double) 0);
                account.setLet_frequency(0);
                account.setOut_frequency(0);
                //保存账户信息
                accountDao.saveAccount(account);
                //注册成功的提示信息
                request.setAttribute("info", "恭喜，注册成功！您可以登录开始租车啦！");
            }else{
                //注册失败的提示信息
                request.setAttribute("info", "错误，用户名已存在！");
            }
        }
        //转发到login.jsp页面
        request.getRequestDispatcher("login.jsp").forward(request, response);
    }

}

在RegServlet中会接受页面输入的资料信息，然后调用UserDao中的方法将数据添加到数据库中并同步更新数据库，同时会初始化这个新用户的账户信息，最后提示注册成功并返回到登录页面，输入账号密码，点击登录按钮，通过web.xml中配置好的信息找到并执行LoginServlet

package com.david.Servlet;

import java.io.IOException;

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

import com.david.Account;
import com.david.User;
import com.david.dao.AccountDao;
import com.david.dao.UserDao;

/**
 * 用户登录 Servlet
 * Servlet implementation class LoginServlet
 */
public class LoginServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginServlet() {
        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
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        //获取用户名
        String username = request.getParameter("username");
        //获取密码
        String password = request.getParameter("password");
        //实例化UserDao对象
        UserDao userDao = new UserDao();
        //根据用户名密码查询用户
        User user = userDao.login(username, password);
        //判断用户是否为空
        if(user != null){
            //将用户对象放入session中
            request.getSession().setAttribute("user", user);
            //根据用户权限跳转不同的页面
            if("普通用户".equals(user.getCompetence()) || "贵宾用户".equals(user.getCompetence())){
                //实例化一个账户对象
                AccountDao accountDao = new AccountDao();
                //根据用户id查询账户
                Account account = accountDao.useridaccount(user.getId());
                request.setAttribute("account", account);
                //转发到 userinfo.jsp 页面
                request.getRequestDispatcher("userinfo.jsp").forward(request, response);
            }else if("管理员用户".equals(user.getCompetence())){
                //转发到admininfo.jsp页面
                request.getRequestDispatcher("admininfo.jsp").forward(request, response);
            }else{

            }
        }else{
            //登录失败
            request.setAttribute("info", "错误：用户名或密码错误！");
            //转发到 userinfo.jsp 页面
            request.getRequestDispatcher("userinfo.jsp").forward(request, response);
        }
    }

}

在LoginServlet中会接受用户输入的账户密码信息，并调用中的方法验证用户密码是否正确，验证完毕判断用户权限，根据不同的权限跳转不同的页面，这里因为目前超级管理员功能还没扩展出来，所以第二个else暂时是空的

javaweb版本的答答租车系统（源代码三）原创