本文主要為大家分析了圖書商城的用戶模塊，具體內容如下
1、用戶模塊的相關類創建
domain：User
dao：UserDao
service：UserDao
web.servlet：UserServlet
2、用戶註冊
2.1 註冊流程
/jsps/user/regist.jsp -> UserServlet#regist() -> msg.jsp
2.2 註冊頁面
<%@ 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>註冊</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>註冊</h1> <%-- 1. 顯示errors --> 字段錯誤2. 顯示異常錯誤3. 回顯--%><p style="color: red; font-weight: 900">${msg }</p><form action="<c:url value='/UserServlet'/>" method="post"> <input type="hidden" name="method" value="regist"/> 用戶名：<input type="text" name="username" value="${form.username }"/> <span style="color: red; font-weight: 900">${errors.username }</span> <br/> 密碼：<input type="password" name="password" value="${form.password }"/> <span style="color: red; font-weight: 900">${errors.password }</span> <br/> 郵箱：<input type="text" name="email" value="${form.email }"/> <span style="color: red; font-weight: 900">${errors.email }</span> <br/> <input type="submit" value="註冊"/></form> </body></html>2.3 UserServlet
User
/** * User的領域對象*/public class User { /* * 對應數據庫表*/ private String uid;// 主鍵private String username;// 用戶名private String password;// 密碼private String email;// 郵箱private String code;// 激活碼private boolean state;// 狀態（已激活和未激活）BaseServlet
public class BaseServlet extends HttpServlet { /* * 它會根據請求中的method，來決定調用本類的哪個方法*/ 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");// 它是一個方法名稱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表述層*/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. 封裝表單數據到form中* 2. 輸入校驗（不寫了） * 3. 調用service完成激活* > 保存錯誤信息、form到request，轉發到login.jsp * 4. 保存用戶信息到session中，然後重定向到index.jsp */ User form = CommonUtils.toBean(request.getParameterMap(), User.class); try { User user = userService.login(form); request.getSession().setAttribute("session_user", user); /* * 給用戶添加一個購物車，即向session中保存一Cart對象*/ 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. 獲取參數激活碼* 2. 調用service方法完成激活* > 保存異常信息到request域，轉發到msg.jsp * 3. 保存成功信息到request域，轉發到msg.jsp */ String code = request.getParameter("code"); try { userService.active(code); request.setAttribute("msg", "恭喜，您激活成功了！請馬上登錄！ "); } catch (UserException e) { request.setAttribute("msg", e.getMessage()); } return "f:/jsps/msg.jsp"; } /** * 註冊功能* @param request * @param response * @return * @throws ServletException * @throws IOException */ public String regist(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { /* * 1. 封裝表單數據到form對像中* 2. 補全：uid、code * 3. 輸入校驗* > 保存錯誤信息、form到request域，轉發到regist.jsp * 4. 調用service方法完成註冊* > 保存錯誤信息、form到request域，轉發到regist.jsp * 5. 發郵件* 6. 保存成功信息轉發到msg.jsp */ // 封裝表單數據User form = CommonUtils.toBean(request.getParameterMap(), User.class); // 補全form.setUid(CommonUtils.uuid()); form.setCode(CommonUtils.uuid() + CommonUtils.uuid()); /* * 輸入校驗* 1. 創建一個Map，用來封裝錯誤信息，其中key為表單字段名稱，值為錯誤信息*/ Map<String,String> errors = new HashMap<String,String>(); /* * 2. 獲取form中的username、password、email進行校驗*/ String username = form.getUsername(); if(username == null || username.trim().isEmpty()) { errors.put("username", "用戶名不能為空！"); } else if(username.length() < 3 || username.length() > 10) { errors.put("username", "用戶名長度必須在3~10之間！ "); } String password = form.getPassword(); if(password == null || password.trim().isEmpty()) { errors.put("password", "密碼不能為空！"); } else if(password.length() < 3 || password.length() > 10) { errors.put("password", "密碼長度必須在3~10之間！"); } String email = form.getEmail(); if(email == null || email.trim().isEmpty()) { errors.put("email", "Email不能為空！"); } else if(!email.matches("//w+@//w+//.//w+")) { errors.put("email", "Email格式錯誤！"); } /* * 3. 判斷是否存在錯誤信息*/ if(errors.size() > 0) { // 1. 保存錯誤信息// 2. 保存表單數據// 3. 轉發到regist.jsp request.setAttribute("errors", errors); request.setAttribute("form", form); return "f:/jsps/user/regist.jsp"; } /* * 調用service的regist()方法*/ try { userService.regist(form); } catch (UserException e) { /* * 1. 保存異常信息* 2. 保存form * 3. 轉發到regist.jsp */ request.setAttribute("msg", e.getMessage()); request.setAttribute("form", form); return "f:/jsps/user/regist.jsp"; } /* * 發郵件* 準備配置文件！ */ // 獲取配置文件內容Properties props = new Properties(); props.load(this.getClass().getClassLoader() .getResourceAsStream("email_template.properties")); String host = props.getProperty("host");//獲取服務器主機String uname = props.getProperty("uname");//獲取用戶名String pwd = props.getProperty("pwd");//獲取密碼String from = props.getProperty("from");//獲取發件人String to = form.getEmail();//獲取收件人String subject = props.getProperty("subject");//獲取主題String content = props.getProperty("content");//獲取郵件內容content = MessageFormat.format(content, form.getCode());//替換{0} Session session = MailUtils.createSession(host, uname, pwd);//得到session Mail mail = new Mail(from, to, subject, content);//創建郵件對象try { MailUtils.send(session, mail);//發郵件！ } catch (MessagingException e) { } /* * 1. 保存成功信息* 2. 轉發到msg.jsp */ request.setAttribute("msg", "恭喜，註冊成功！請馬上到郵箱激活"); return "f:/jsps/msg.jsp"; }}2.4 UserService
/** * User業務層*/public class UserService { private UserDao userDao = new UserDao(); /** * 註冊功能* @param form */ public void regist(User form) throws UserException{ // 校驗用戶名User user = userDao.findByUsername(form.getUsername()); if(user != null) throw new UserException("用戶名已被註冊！"); // 校驗email user = userDao.findByEmail(form.getEmail()); if(user != null) throw new UserException("Email已被註冊！"); // 插入用戶到數據庫userDao.add(form); } /** * 激活功能* @throws UserException */ public void active(String code) throws UserException { /* * 1. 使用code查詢數據庫，得到user */ User user = userDao.findByCode(code); /* * 2. 如果user不存在，說明激活碼錯誤*/ if(user == null) throw new UserException("激活碼無效！"); /* * 3. 校驗用戶的狀態是否為未激活狀態，如果已激活，說明是二次激活，拋出異常*/ if(user.isState()) throw new UserException("您已經激活過了，不要再激活了，除非你想死！"); /* * 4. 修改用戶的狀態*/ userDao.updateState(user.getUid(), true); } /** * 登錄功能* @param form * @return * @throws UserException */ public User login(User form) throws UserException { /* * 1. 使用username查詢，得到User * 2. 如果user為null，拋出異常（用戶名不存在） * 3. 比較form和user的密碼，若不同，拋出異常（密碼錯誤） * 4. 查看用戶的狀態，若為false，拋出異常（尚未激活） * 5. 返回user */ User user = userDao.findByUsername(form.getUsername()); if(user == null) throw new UserException("用戶名不存在！ "); if(!user.getPassword().equals(form.getPassword())) throw new UserException("密碼錯誤！"); if(!user.isState()) throw new UserException("尚未激活！"); return user; }}2.5 UserDao
/** * User持久層*/public class UserDao { private QueryRunner qr = new TxQueryRunner(); /** * 按用戶名查詢* @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查詢* @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); } } /** * 按激活碼查詢* @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); } } /** * 修改指定用戶的指定狀態* @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、用戶激活
流程：用戶的郵件中-> UserServlet#active() -> msg.jsp
4、
用戶登錄
流程：/jsps/user/login.jsp -> UserServlet#login() -> index.jsp
5、
用戶退出
流程：top.jsp -> UserServlet#quit() -> login.jsp
quit()：把session銷毀！
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。