图书商城：用户模块
用戶模塊
1、用戶模塊的相關類創建
- domain：User
- dao：UserDao
- service：UserDao
- web.servlet：UserServlet
2、用戶注冊
2.1 注冊流程
/jsps/user/regist.jsp -> UserServlet#regist() -> msg.jsp
2.2 注冊頁面
<%@ 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>注冊</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>注冊</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="注冊"/> </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=addString 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);/** 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";}/*** 注冊功能* @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對象中* 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方法完成注冊* > 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.jsprequest.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sessionMail 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，注冊成功！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();/*** 注冊功能* @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("用戶名已被注冊！");// 校驗emailuser = userDao.findByEmail(form.getEmail());if(user != null) throw new UserException("Email已被注冊！");// 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！
總結
