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
4、
用户登录
流程：/jsps/user/login.jsp -> UserServlet#login() -> index.jsp
5、
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武林网。