javaweb图书商城设计之用户模块(1)

  • Z时代
  • 2024-01-10
  • 分类：IT

本文主要为大家分析了图书商城的用户模块，具体内容如下

1、用户模块的相关类创建

domain：User

dao：UserDao

service：UserDao

web.servlet：UserServlet

2、用户注册

2.1 注册流程

/jsps/user/regist.jsp -> UserServlet#regist() -> msg.jsp

2.2 注册页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
 <title>注册</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">
 <meta http-equiv="content-type" content="text/html;charset=utf-8">
 <!--
 <link rel="stylesheet" type="text/css" href="styles.css">
 -->
 </head>
 <body>
 <h1>注册</h1>
 <%--
 1. 显示errors --> 字段错误
 2. 显示异常错误
 3. 回显
 --%>
<p style="color: red; font-weight: 900">${msg }</p>
<form action="<c:url value='/UserServlet'/>" method="post">
 <input type="hidden" name="method" value="regist"/>
 用户名：<input type="text" name="username" value="${form.username }"/>
 <span style="color: red; font-weight: 900">${errors.username }</span>
 <br/>
 密　码：<input type="password" name="password" value="${form.password }"/>
 <span style="color: red; font-weight: 900">${errors.password }</span>
 <br/>
 邮　箱：<input type="text" name="email" value="${form.email }"/>
 <span style="color: red; font-weight: 900">${errors.email }</span>
 <br/>
 <input type="submit" value="注册"/>
</form>
 </body>
</html>

2.3 UserServlet

User

/**
 * User的领域对象
 */
public class User {
 /*
  * 对应数据库表
  */
 private String uid;// 主键
 private String username;// 用户名
 private String password;// 密码
 private String email;// 邮箱
 private String code;// 激活码
 private boolean state;// 状态（已激活和未激活）

BaseServlet

public class BaseServlet extends HttpServlet {
 /*
  * 它会根据请求中的method，来决定调用本类的哪个方法
  */
 protected void service(HttpServletRequest req, HttpServletResponse res)
   throws ServletException, IOException {
  req.setCharacterEncoding("UTF-8");
  res.setContentType("text/html;charset=utf-8");
  try {
   // 例如：http://localhost:8080/demo1/xxx?m=add
   String method = req.getParameter("method");// 它是一个方法名称
   Class c = this.getClass();
   Method m = c.getMethod(method, HttpServletRequest.class,
     HttpServletResponse.class);
   String result = (String) m.invoke(this, req, res);
   if(result != null && !result.isEmpty()) {
    req.getRequestDispatcher(result).forward(req, res);
   }
  } catch (Exception e) {
   throw new ServletException(e);
  }
 }
}

UserServlet

/**
 * User表述层
 */
public class UserServlet extends BaseServlet {
 private UserService userService = new UserService();
 /**
  * 退出功能
  * @param request
  * @param response
  * @return
  * @throws ServletException
  * @throws IOException
  */
 public String quit(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  request.getSession().invalidate();
  return "r:/index.jsp";
 }
 public String login(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  /*
   * 1. 封装表单数据到form中
   * 2. 输入校验（不写了）
   * 3. 调用service完成激活
   * > 保存错误信息、form到request，转发到login.jsp
   * 4. 保存用户信息到session中，然后重定向到index.jsp
   */
  User form = CommonUtils.toBean(request.getParameterMap(), User.class);
  try {
   User user = userService.login(form);
   request.getSession().setAttribute("session_user", user);
   /*
    * 给用户添加一个购物车，即向session中保存一Cart对象
    */
   request.getSession().setAttribute("cart", new Cart());
   return "r:/index.jsp";
  } catch (UserException e) {
   request.setAttribute("msg", e.getMessage());
   request.setAttribute("form", form);
   return "f:/jsps/user/login.jsp";
  }
 }
 /**
  * 激活功能
  * @param request
  * @param response
  * @return
  * @throws ServletException
  * @throws IOException
  */
 public String active(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  /*
   * 1. 获取参数激活码
   * 2. 调用service方法完成激活
   * > 保存异常信息到request域，转发到msg.jsp
   * 3. 保存成功信息到request域，转发到msg.jsp
   */
  String code = request.getParameter("code");
  try {
   userService.active(code);
   request.setAttribute("msg", "恭喜，您激活成功了！请马上登录！");
  } catch (UserException e) {
   request.setAttribute("msg", e.getMessage());
  }
  return "f:/jsps/msg.jsp";
 }
 /**
  * 注册功能
  * @param request
  * @param response
  * @return
  * @throws ServletException
  * @throws IOException
  */
 public String regist(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  /*
   * 1. 封装表单数据到form对象中
   * 2. 补全：uid、code
   * 3. 输入校验
   * > 保存错误信息、form到request域，转发到regist.jsp
   * 4. 调用service方法完成注册
   * > 保存错误信息、form到request域，转发到regist.jsp
   * 5. 发邮件
   * 6. 保存成功信息转发到msg.jsp
   */
  // 封装表单数据
  User form = CommonUtils.toBean(request.getParameterMap(), User.class);
  // 补全
  form.setUid(CommonUtils.uuid());
  form.setCode(CommonUtils.uuid() + CommonUtils.uuid());
  /*
   * 输入校验
   * 1. 创建一个Map，用来封装错误信息，其中key为表单字段名称，值为错误信息
   */
  Map<String,String> errors = new HashMap<String,String>();
  /*
   * 2. 获取form中的username、password、email进行校验
   */
  String username = form.getUsername();
  if(username == null || username.trim().isEmpty()) {
   errors.put("username", "用户名不能为空！");
  } else if(username.length() < 3 || username.length() > 10) {
   errors.put("username", "用户名长度必须在3~10之间！");
  }
  String password = form.getPassword();
  if(password == null || password.trim().isEmpty()) {
   errors.put("password", "密码不能为空！");
  } else if(password.length() < 3 || password.length() > 10) {
   errors.put("password", "密码长度必须在3~10之间！");
  }
  String email = form.getEmail();
  if(email == null || email.trim().isEmpty()) {
   errors.put("email", "Email不能为空！");
  } else if(!email.matches("\\w+@\\w+\\.\\w+")) {
   errors.put("email", "Email格式错误！");
  }
  /*
   * 3. 判断是否存在错误信息
   */
  if(errors.size() > 0) {
   // 1. 保存错误信息
   // 2. 保存表单数据
   // 3. 转发到regist.jsp
   request.setAttribute("errors", errors);
   request.setAttribute("form", form);
   return "f:/jsps/user/regist.jsp";
  }
  /*
   * 调用service的regist()方法
   */
  try {
   userService.regist(form);
  } catch (UserException e) {
   /*
    * 1. 保存异常信息
    * 2. 保存form
    * 3. 转发到regist.jsp
    */
   request.setAttribute("msg", e.getMessage());
   request.setAttribute("form", form);
   return "f:/jsps/user/regist.jsp";
  }
  /*
   * 发邮件
   * 准备配置文件！
   */
  // 获取配置文件内容
  Properties props = new Properties();
  props.load(this.getClass().getClassLoader()
    .getResourceAsStream("email_template.properties"));
  String host = props.getProperty("host");//获取服务器主机
  String uname = props.getProperty("uname");//获取用户名
  String pwd = props.getProperty("pwd");//获取密码
  String from = props.getProperty("from");//获取发件人
  String to = form.getEmail();//获取收件人
  String subject = props.getProperty("subject");//获取主题
  String content = props.getProperty("content");//获取邮件内容
  content = MessageFormat.format(content, form.getCode());//替换{0}
  Session session = MailUtils.createSession(host, uname, pwd);//得到session
  Mail mail = new Mail(from, to, subject, content);//创建邮件对象
  try {
   MailUtils.send(session, mail);//发邮件！
  } catch (MessagingException e) {
  }
  /*
   * 1. 保存成功信息
   * 2. 转发到msg.jsp
   */
  request.setAttribute("msg", "恭喜，注册成功！请马上到邮箱激活");
  return "f:/jsps/msg.jsp";
 }
}

2.4 UserService

/**
 * User业务层
 */
public class UserService {
 private UserDao userDao = new UserDao();
 /**
  * 注册功能
  * @param form
  */
 public void regist(User form) throws UserException{
  // 校验用户名
  User user = userDao.findByUsername(form.getUsername());
  if(user != null) throw new UserException("用户名已被注册！");
  // 校验email
  user = userDao.findByEmail(form.getEmail());
  if(user != null) throw new UserException("Email已被注册！");
  // 插入用户到数据库
  userDao.add(form);
 }
 /**
  * 激活功能
  * @throws UserException 
  */
 public void active(String code) throws UserException {
  /*
   * 1. 使用code查询数据库，得到user
   */
  User user = userDao.findByCode(code);
  /*
   * 2. 如果user不存在，说明激活码错误
   */
  if(user == null) throw new UserException("激活码无效！");
  /*
   * 3. 校验用户的状态是否为未激活状态，如果已激活，说明是二次激活，抛出异常
   */
  if(user.isState()) throw new UserException("您已经激活过了，不要再激活了，除非你想死！");
  /*
   * 4. 修改用户的状态
   */
  userDao.updateState(user.getUid(), true);
 }
 /**
  * 登录功能
  * @param form
  * @return
  * @throws UserException 
  */
 public User login(User form) throws UserException {
  /*
   * 1. 使用username查询，得到User
   * 2. 如果user为null，抛出异常（用户名不存在）
   * 3. 比较form和user的密码，若不同，抛出异常（密码错误）
   * 4. 查看用户的状态，若为false，抛出异常（尚未激活）
   * 5. 返回user
   */
  User user = userDao.findByUsername(form.getUsername());
  if(user == null) throw new UserException("用户名不存在！");
  if(!user.getPassword().equals(form.getPassword()))
   throw new UserException("密码错误！");
  if(!user.isState()) throw new UserException("尚未激活！");
  return user;
 }
}

2.5 UserDao

/**
 * User持久层
 */
public class UserDao {
 private QueryRunner qr = new TxQueryRunner();
 /**
  * 按用户名查询
  * @param username
  * @return
  */
 public User findByUsername(String username) {
  try {
   String sql = "select * from tb_user where username=?";
   return qr.query(sql, new BeanHandler<User>(User.class), username);
  } catch(SQLException e) {
   throw new RuntimeException(e);
  }
 }
 /**
  * 按email查询
  * @param email
  * @return
  */
 public User findByEmail(String email) {
  try {
   String sql = "select * from tb_user where email=?";
   return qr.query(sql, new BeanHandler<User>(User.class), email);
  } catch(SQLException e) {
   throw new RuntimeException(e);
  }
 }
 /**
  * 插入User
  * @param user
  */
 public void add(User user) {
  try {
   String sql = "insert into tb_user values(?,?,?,?,?,?)";
   Object[] params = {user.getUid(), user.getUsername(), 
     user.getPassword(), user.getEmail(), user.getCode(),
     user.isState()};
   qr.update(sql, params);
  } catch(SQLException e) {
   throw new RuntimeException(e);
  }
 }
 /**
  * 按激活码查询
  * @param code
  * @return
  */
 public User findByCode(String code) {
  try {
   String sql = "select * from tb_user where code=?";
   return qr.query(sql, new BeanHandler<User>(User.class), code);
  } catch(SQLException e) {
   throw new RuntimeException(e);
  }
 }
 /**
  * 修改指定用户的指定状态
  * @param uid
  * @param state
  */
 public void updateState(String uid, boolean state) {
  try {
   String sql = "update tb_user set state=? where uid=?";
   qr.update(sql, state, uid);
  } catch(SQLException e) {
   throw new RuntimeException(e);
  }
 }
}

3、用户激活

流程：用户的邮件中 -> UserServlet#active() -> msg.jsp

用户登录

流程：/jsps/user/login.jsp -> UserServlet#login() -> index.jsp

用户退出

流程：top.jsp -> UserServlet#quit() -> login.jsp

quit()：把session销毁！

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。

以上是 javaweb图书商城设计之用户模块(1) 的全部内容， 来源链接： utcz.com/p/210249.html

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