书城项目第三阶段及其源码
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书城项目第三阶段及其源码
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書城項目第三階段
- 1.第三階段：
- 頁面樣式
- 首頁
- 登錄
- 登錄成功
- 注冊
- 注冊成功
- a) 頁面jsp動態化
- 所有需要的jar包
- index.jsp
- 源碼pages目錄下
- user
- login.jsp
- login_success.jsp
- regist.jsp
- regist_success.jsp
- cart包
- cart.jsp
- checkout.jsp
- manager包
- book_edit.jsp
- book_manager.jsp
- manager.jsp
- order_manager.jsp
- order
- order.jsp
- b)抽取頁面中相同的內容
- common包 在pages下新建
- i. head 中css、 jquery、base標簽
- head.jsp
- ii.每個頁面的頁腳
- footer.jsp
- iii.登錄成功后的菜單
- login_sucess_menu.jsp
- iv. manager模塊的菜單
- manager_menu.jsp
- c)登錄，注冊錯誤提示，及表單回顯
- d) BaseServlet的抽取
- 代碼優化一：合并LoginServlet和RegistServlet程序為UserServlet
- 代碼優化二：使用反射優化到了else if 代碼
- UserServletTest test包下測試類
- 抽取BaseServlet程序
- BaseServlet
- e)數據的封裝和抽取BeanUtis的使用
- WebUtils 在Utils包下
- UserServlet 在web包下
1.第三階段：
頁面樣式
首頁
登錄
登錄成功
注冊
注冊成功
a) 頁面jsp動態化
注意導jsp和EL表達式有關的jar包，以及配置
所有需要的jar包
注意collections要用3.x的，不能是4.x的
1、在html頁面頂行添加page指令
2、修改文件后綴名為.jsp
3、使用IDEA搜索替換.html為.jsp(快捷鍵Ctrl+Shift+R)
index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <!DOCTYPE html> <html lang="en"> <head><meta charset="UTF-8"><title>書城首頁</title><%--靜態包含 base標簽，css樣式，jquery文件 --%><%@ include file="/pages/common/head.jsp"%></head> <body><div id="header"><img class="logo_ing" alt="" src="static/img/logo.gif"><span class= "wel_word">網上書城</span><div><a href="pages/user/login.jsp">登錄</a><a href="pages/user/regist.jsp">注冊</a><a href="pages/cart/cart.jsp">購物車</a><a href="pages/manager/manager.jsp">后臺管理</a></div><div id="main"><div id="book"><div class="book_cond"><form action="" method="get">價格:<input id="min" type="text" name="min" valuen="">元-<input id="max" type="text" name="max" value="">元<input type="submit" value="查詢"/></form></div><div style="..."><span>您的購物車中有3件商品</span><div>您剛剛將<span style="...">時間簡史</span>加入到了購物車中</div></div><div class="b_list"><div class="img_div"><img class="book_img" alt="static/img/default.jpg"/></div><div class="book_info"><div class="book_name"><span class="sp1">書名:</span><span class="sp2">時間簡史</span></div><div class="book_author"><span class="sp1">作者:</span><span class="sp2">霍金</span></div><div class= "book_price"><span class="sp1">價格:</span><span class="sp2">￥30.00</span></div><div class="book_sales"><span class="sp1">銷量:</span><span class="sp2">230</span></div><div class="book_amount"><span class="sp1">庫存:</span><span class="sp2">1000</span></div><div class="book_add"><button>加入購物車:</button></div></div></div></div><div id="page_nav"><a href="#">首頁</a><a href="#">上一頁</a><a href="">3</a>【4】<a href="#">5</a><a href="#">下一頁</a><a href="#">末頁</a>共10頁，30條記錄 到第<input value="4" name="pn" id="pn_input"/>頁<input type="button" value="確定"></div></div></div><%--靜態包含頁腳內容--%><%@include file="/pages/common/footer.jsp"%></body> </html>源碼pages目錄下
user
login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %><!DOCTYPE html> <html> <head><meta charset="UTF-8"><title>尚硅谷會員登錄頁面</title><%--靜態包含 base標簽，css樣式，jquery文件 --%><%@ include file="/pages/common/head.jsp"%></head> <body><div id="login_header"><img class="logo_img" alt="" src="static/img/logo.gif" ></div><div class="login banner"><div id="l_content"><span class="login_word">歡迎登錄</span></div><div id="content"><div class="login_form"><div class="login_box"><div class="tit"><h1>尚硅谷會員</h1><a href="pages/user/regist.jsp">立即注冊</a></div><div class="msg_cont"><b></b><span class="errorMsg"><%=request.getAttribute("msg")==null?"請輸入用戶名和密碼":request.getAttribute("msg")%><%-- 請輸入用戶名和密碼--%></span></div><div class="form"><form action="userServlet" method="post"><input type="hidden" name="action" value="login"/><label>用戶名稱:</label><input class="itxt" type="text" placeholder="請輸入用戶名"autocomplete="off" tabindex="1" name="username"value="<%=request.getAttribute("username")==null?"":request.getAttribute("username")%>"/><br/><br/><label>用戶密碼:</label><input class="itxt" type="password" placeholder="請輸入密碼" autocomplete="off" tabindex="1" name="password"/><br/><br/><input type="submit" value="登錄" id="sub_btn"/></form></div></div></div></div></div><%--靜態包含頁腳內容--%><%@ include file="/pages/common/footer.jsp" %></body> </html>login_success.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <!DOCTYPE html> <html lang="en"> <head><meta charset="UTF-8"><title>尚硅谷會員登錄</title><style type="text/css">h1{text-align: center;margin-top: 200px;}h1 a {color: red;}</style> </head> <body> <div id="header"><img class="logo_img" alt="" src="static/img/logo.gif"><%-- 靜態包含登錄成功之后的菜單--%><%@ include file="/pages/common/login_sucess_menu.jsp"%><div id="main"><h1>歡迎回來<a href="../../index.jsp">轉到主頁</a></h1></div> </div><%--靜態包含頁腳內容--%> <%@include file="/pages/common/footer.jsp"%></body> </html>regist.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <!DOCTYPE html><html><head><meta charset="UTF-8"><title>尚硅谷會員注冊頁面</title><%--靜態包含 base標簽，css樣式，jquery文件 --%><%@ include file="/pages/common/head.jsp"%><script type="text/javascript">//頁面加載完成之后$(function () {//給注冊綁定單擊事件$("#sub_btn").click(function () {//驗證用戶名:必須由字母，數字下劃線組成，并且長度為5到12位//1獲取用戶名輸入框里的內容var usernameText=$("#username").val();//2創建正則表達式對象var usernamePatt=/^\w{5,12}$/;//3使test方法驗證if(!usernamePatt.test(usernameText)){//4提示用戶結果$("span.errorMsg").text("用戶名不合法!");return false;}//驗證密碼:必須由字母，數字下劃線組成，并且長度為5到12位//1獲取用戶名輸入框里的內容var passwordText=$("#password").val();//2創建正則表達式對象var passwordPatt=/^\w{5,12}$/;//3使test方法驗證if(!passwordPatt.test(passwordText)){//4提示用戶結果$("span.errorMsg").text("密碼不合法!");return false;}//驗證確認密碼:和密碼相同//1獲取確認密碼內容var repwdText=$("#repwd").val();//2和密碼相比較if (repwdText!=passwordText){//3提示用戶$("span.errorMsg").text("確認密碼和密碼不一致!");return false;}//郵箱驗證:xxxxx@xxx.com//1獲取郵箱里的內容var emailText=$("#email").val();//2創建正則表達式對象var emailPatt=/^[a-z\d]+(\.[a-z\d]+)*@([\da-z](-[\da-z])?)+(\.{1,2}[a-z]+)+$/;//3使test方法驗證if(!emailPatt.test(emailText)){//4提示用戶結果$("span.errorMsg").text("郵箱格式不合法!");return false;}//驗證碼現在只需要驗證用戶已輸入。因為還沒講到服務器。驗證碼生成。var codeText=$("#code").val();//去掉驗證碼前后空格alert("去空格前["+codeText+"]");codeText=$.trim(codeText);alert("去空格后["+codeText+"]");if (codeText==null||codeText==""){//提示用戶結果$("span.errorMsg").text("驗證碼不能為空");return false;}$("span.errorMsg").text("");});});</script><style type="text/css">.login_form {height: 420px;margin-top: 25px;}</style></head><body><div id="login_header"><img class="logo_img" alt="" src="static/img/logo.gif"> </div><div class="login_banner"><div id="l_content"><span class="login_word">歡迎注冊</span></div><div id="content"><div class="login_form"><div class="login_box"><div class="tit"><h1>注冊尚硅谷會員</h1><span class="errorMsg"><%=request.getAttribute("msg")==null?"":request.getAttribute("msg")%></span></div><div class="form"><form action="userServlet" method="post"><input type="hidden" name="action" value="regist"/><label>用戶名稱:</label><input class="itxt" type="text" placeholder="請輸入用戶名"value="<%=request.getAttribute("username")==null?"":request.getAttribute("username")%>"autocomplete="off" tabindex="1" name="username" id="username"/><br/><br/><label>用戶密碼:</label><input class="itxt" type="password" placeholder="請輸入密碼"autocomplete="off" tabindex="1" name="password" id="password"/><br/><br/><label>確認密碼:</label><input class="itxt" type="password" placeholder="確認密碼"autocomplete="off" tabindex="1" name="repwd" id="repwd"/><br/><br/><label>電子郵件:</label><input class="itxt" type="text" placeholder="請輸入郵箱地址"value="<%=request.getAttribute("email")==null?"":request.getAttribute("email")%>"autocomplete="off" tabindex="1" name="email" id="email"/><br/><br/><label>驗證碼:</label><input class="itxt" type="text" name="code" style="..." id="code"/><img alt="" src="static/img/code.bmp" style="..."><br/><br/><input type="submit" value="注冊" id="sub_btn"/></form></div></div></div></div> </div><%--靜態包含頁腳內容--%> <%@include file="/pages/common/footer.jsp"%></body></html>regist_success.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <!DOCTYPE html> <html> <head><meta charset="UTF-8"><title>尚硅谷會員注冊頁面</title><%--靜態包含 base標簽，css樣式，jquery文件 --%><%@ include file="/pages/common/head.jsp"%><style type="text/css">h1{text-align: center;margin-top: 200px;}h1 a {color: red;}</style> </head> <body><div id="header"><img class="logo_img" alt="" src="static/img/logo.gif"><span class="wel_word"></span><%-- 靜態包含登錄成功之后的菜單--%><%@ include file="/pages/common/login_sucess_menu.jsp"%></div><div id="main"><h1>注冊成功!<a href="../../index.jsp">轉到主頁</a></h1></div><%--靜態包含頁腳內容--%><%@include file="/pages/common/footer.jsp"%></body> </html>cart包
cart.jsp
<%--Created by IntelliJ IDEA.User: lenovoDate: 2021/8/21Time: 下午 02:49To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <!DOCTYPE html> <html> <head><meta charset="UTF-8"><title>購物車</title><%--靜態包含 base標簽，css樣式，jquery文件 --%><%@ include file="/pages/common/head.jsp"%></head> <body><div id="header"><img class="logo_img" alt="" src="static/img/logo.gif"><span class="wel_word">購物車</span><%-- 靜態包含登錄成功之后的菜單--%><%@ include file="/pages/common/login_sucess_menu.jsp"%></div><%--靜態包含頁腳內容--%><%@include file="/pages/common/footer.jsp"%> </body> </html>checkout.jsp
<%--Created by IntelliJ IDEA.User: lenovoDate: 2021/8/21Time: 下午 02:49To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <!DOCTYPE html> <html> <head><meta charset="UTF-8"><title>結算頁面</title><%--靜態包含 base標簽，css樣式，jquery文件 --%><%@ include file="/pages/common/head.jsp"%><style type="text/css">h1 {text-align: center;margin-top: 200px;} </style> </head> <body><div id="header"><img class="logo_img" alt="" src="../../static/img/logo.gif"><span class="wel_word">結算</span><%-- 靜態包含登錄成功之后的菜單--%><%@ include file="/pages/common/login_sucess_menu.jsp"%></div><%--靜態包含頁腳內容--%><%@include file="/pages/common/footer.jsp"%> </body> </html>manager包
book_edit.jsp
<%--Created by IntelliJ IDEA.User: lenovoDate: 2021/8/21Time: 下午 02:46To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <!DOCTYPE html> <html> <head><meta charset="UTF-8"><title>編輯圖書</title><%--靜態包含 base標簽，css樣式，jquery文件 --%><%@ include file="/pages/common/head.jsp"%><style type="text/css">h1 {text-align: center;margin-top: 200px;}h1 a{color:red;}input {text-align: center;}</style> <body><div id="header"><img class="logo_ing" alt="" arc="../../static/1mg/logo.gif"><span class="wel_word">編輯圖書</span><%-- 靜態包含manager 管理模塊的菜單 --%><%@ include file="/pages/common/manager_menu.jsp"%></div><div id="main"><form action="book_manager.jsp"><table><tr><td>名稱</td><td>價格</td><td>作者</td><td>銷量</td><td>庫存</td><td colspan="2">操作</td></tr><tr><td><input nane="book_name" type="text" value="時間簡史"/></td><td><input nane="book_price" type="text" value="30.00"/></td><td><input name="book_author" type="text" value="霍金"/></td><td><input name="book_sales" type="text" value="200"/></td><td><input name="book_stock" type="text" value="300"/></td><td><input type= "submit" value="提交"/></td></tr></table></form></div><%--靜態包含頁腳內容--%><%@include file="/pages/common/footer.jsp"%></body> </html>book_manager.jsp
<%--Created by IntelliJ IDEA.User: lenovoDate: 2021/8/21Time: 下午 02:47To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head><meta charset="UTF-8"><title>圖書管理</title><%--靜態包含 base標簽，css樣式，jquery文件 --%><%@ include file="/pages/common/head.jsp"%></head> <body><div id="header"><img class="logo_img" alt="" src="../../static/img/logo.gif"> <span class="wel_word">圖書管理系統</span><%-- 靜態包含manager 管理模塊的菜單 --%><%@ include file="/pages/common/manager_menu.jsp"%></div><div id="main"><table><tr><td>名稱</td><td>價格</td><td>作者</td><td>銷量</td><td>庫存</td><td colspan="2">操作</td></tr><tr><td>時間簡史</td><td>20.00</td><td>霍金</td><td>200</td><td>400</td><td><a href="book_edit.jsp">修改</a> </td><td><a href="#">刪除</a> </td></tr><tr><td>時間簡史</td><td>20.00</td><td>霍金</td><td>200</td><td>400</td><td><a href="book_edit.jsp">修改</a> </td><td><a href="#">刪除</a> </td></tr><tr><td>時間簡史</td><td>20.00</td><td>霍金</td><td>200</td><td>400</td><td><a href="book_edit.jsp">修改</a> </td><td><a href="#">刪除</a> </td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td><a href="book_edit.jsp">添加圖書</a> </td></tr></table></div><%--靜態包含頁腳內容--%><%@include file="/pages/common/footer.jsp"%></body> </html>manager.jsp
<%--Created by IntelliJ IDEA.User: lenovoDate: 2021/8/21Time: 下午 02:47To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>后臺管理</title><%--靜態包含 base標簽，css樣式，jquery文件 --%><%@ include file="/pages/common/head.jsp"%><style type="text/css">h1{text-align: center;margin-top: 200px;}</style></head> <body><div id="header"><img class="logo_img" alt="" src="../../static/img/logo.gif"><span class="wel_word">后臺管理系統</span><%-- 靜態包含manager 管理模塊的菜單 --%><%@ include file="/pages/common/manager_menu.jsp"%></div><div><h1>歡迎管理員進入后臺管理系統</h1></div><%--靜態包含頁腳內容--%><%@include file="/pages/common/footer.jsp"%></body> </html>order_manager.jsp
<%--Created by IntelliJ IDEA.User: lenovoDate: 2021/8/21Time: 下午 02:47To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <!DOCTYPE html> <html> <head><title>訂單管理</title> </head> <body><div id="header"><img class="logo_img" alt="" src="../../static/img/logo.gif"><span class="wel_word">訂單管理系統</span><%-- 靜態包含manager 管理模塊的菜單 --%><%@ include file="/pages/common/manager_menu.jsp"%></div><div id="main"><table><tr><td>2015.04.20</td><td>20.00</td><td><a href="#">查看詳情</a></td><td>已發貨</td></tr><tr><td>2016.04.20</td><td>20.00</td><td><a href="#">查看詳情</a></td><td>已發貨</td></tr><tr><td>2015.04.20</td><td>20.00</td><td><a href="#">查看詳情</a></td><td>已發貨</td></tr><tr><td>2014.04.20</td><td>20.00</td><td><a href="#">查看詳情</a></td><td>已發貨</td></tr></table></div><%--靜態包含頁腳內容--%><%@include file="/pages/common/footer.jsp"%></body> </html>order
order.jsp
<%--Created by IntelliJ IDEA.User: lenovoDate: 2021/8/21Time: 下午 02:45To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <!DOCTYPE html> <html><head><meta charset="UTF-8"><title>我的訂單</title><%--靜態包含 base標簽，css樣式，jquery文件 --%><%@ include file="/pages/common/head.jsp"%><style type="text/css">h1 {text-align: center;margin-top: 200px;} </style> </head> <body><div id="header"><img class="logo_img" alt="" src="../../static/img/logo.gif"><span class="wel_word">我的訂單</span><%-- 靜態包含登錄成功之后的菜單--%><%@ include file="/pages/common/login_sucess_menu.jsp"%></div><div id="main"><table></table></div><%--靜態包含頁腳內容--%><%@include file="/pages/common/footer.jsp"%></body> </html>b)抽取頁面中相同的內容
common包 在pages下新建
i. head 中css、 jquery、base標簽
head.jsp
<%--Created by IntelliJ IDEA.User: lenovoDate: 2021/8/21Time: 下午 03:59To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <%String basePath=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/"; %><!--寫base標簽，永遠固定相對路徑跳轉的結果--> <base href="<%=basePath%>"> <link type="text/css" rel="stylesheet" href="static/css/style.css"><script type="text/javascript" src="static/script/jquery.js"></script>ii.每個頁面的頁腳
footer.jsp
<%--Created by IntelliJ IDEA.User: lenovoDate: 2021/8/21Time: 下午 04:37To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <div id="bottom"><span>尚硅谷書城.Copyright ?2015</span> </div>iii.登錄成功后的菜單
login_sucess_menu.jsp
<%--Created by IntelliJ IDEA.User: lenovoDate: 2021/8/21Time: 下午 03:51To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <div><span>歡迎<span class="um_span">韓總</span>光臨尚硅谷書城</span><a href="../order/order.jsp">我的訂單</a><a href="../../index.jsp">注銷</a><a href="../../index.jsp">返回</a> </div>iv. manager模塊的菜單
manager_menu.jsp
<%--Created by IntelliJ IDEA.User: lenovoDate: 2021/8/21Time: 下午 05:38To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <div><a href="pages/manager/book_manager.jsp">圖書管理</a><a href="order_manager.jsp">訂單管理</a><a href="../../index.jsp">返回商城</a> </div>c)登錄，注冊錯誤提示，及表單回顯
d) BaseServlet的抽取
代碼優化一：合并LoginServlet和RegistServlet程序為UserServlet
在實際的項目開發中，一個模塊，一般只使用一個Servlet程序。
給login.jsp頁面添加隱藏域action，和修改請求地址
給regist.jsp頁面添加隱藏域action，和修改請求地址
代碼優化二：使用反射優化到了else if 代碼
UserServletTest test包下測試類
package com.atguigu.test;import java.lang.reflect.Method;public class UserServletTest {public void login(){System.out.println("這是login()方法調用了");}public void regist(){System.out.println("這是regist()方法調用了");}public void updateUser(){System.out.println("這是updateUser()方法調用了");}public void updateUserPassword(){System.out.println("這是updateUserPassword()方法調用了");}public static void main(String[] args) {String action="regist";try {//獲取action業務鑒別字符串，獲取相應的業務方法 反射對象Method method = UserServletTest.class.getDeclaredMethod(action);System.out.println(method);//調用目標業務方法method.invoke(new UserServletTest());} catch (Exception e) {e.printStackTrace();}}}抽取BaseServlet程序
其他xxxServlet繼承BaseServlet即可
BaseServlet
package com.atguigu.web;import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.lang.reflect.Method;public abstract class BaseServlet extends HttpServlet {protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {String action=req.getParameter("action"); // System.out.println(action);//action的value和調用的方法名是統一的 // if ("login".equals(action)){ System.out.println("處理登錄的需求"); // login(req,resp); // }else if ("regist".equals(action)){ System.out.println("處理注冊的需求"); // regist(req,resp); // }//反射try {//獲取action業務鑒別字符串，獲取相應的業務方法 反射對象Method method = this.getClass().getDeclaredMethod(action,HttpServletRequest.class,HttpServletResponse.class);//調用目標業務方法method.invoke(this,req,resp);} catch (Exception e) {e.printStackTrace();}}}e)數據的封裝和抽取BeanUtis的使用
BeanUtils 工具類，它可以一次性把所有請求的參數注入到JavaBean中。
BeanUtils不是JDK的類。而是第三方的工具類。所以需要導包。
1、導入需要的jar包
commons-beanutils-1.9.4.jar 下載地址
commons-logging-1.2.jar BeanUtils依賴logging包
2、使用BeanUtils類方法實現注入。
BeanUtils.populate(user,req.getParameterMap());//出現NoClassDefFoundError錯誤導入commons-collections 3.x.jar，4.x不行WebUtils 在Utils包下
package com.atguigu.utils;import org.apache.commons.beanutils.BeanUtils;import java.util.Map;public class WebUtils {/*** 把Map中的值注入到對應的JavaBean屬性中* @param value* @param bean** HttpServletRequest* Dao層* Service層* web層 耦合度高**/ // public static void copyParamToBean(HttpServletRequest req,Object bean ){public static <T> T copyParamToBean(Map value, T bean ){try {System.out.println("注入之前："+bean);/*** 把所有請求的參數都注入到user對象中*/BeanUtils.populate(bean,value);//出現NoClassDefFoundError錯誤導入commons-collections3.x.jar，4.x不行System.out.println("注入之后："+bean);} catch (Exception e) {e.printStackTrace();}return bean;}}UserServlet 在web包下
package com.atguigu.web; import com.atguigu.pojo.User; import com.atguigu.service.UserService; import com.atguigu.service.impl.UserServiceImpl; import com.atguigu.utils.WebUtils;import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException;public class UserServlet extends BaseServlet {private UserService userService = new UserServiceImpl();/*** 處理登錄的功能* @param req* @param resp* @throws ServletException* @throws IOException*/protected void login(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {//1、獲取請求的參數String username = req.getParameter("username");String password = req.getParameter("password");//2、調用XxxService.xxx()處理業務User loginUser = userService.login(new User(null, username, password, null));//如果等于null，說明登錄失敗if (loginUser==null){// 把錯誤信息，和回顯的表單項信息，保存到Request域中req.setAttribute("msg","用戶名或密碼錯誤！");req.setAttribute("username",username);// 跳回登錄頁面req.getRequestDispatcher("/pages/user/login.jsp").forward(req,resp);}else {// 成功// 跳到成功頁面login_success.jspreq.getRequestDispatcher("/pages/user/login_success.jsp").forward(req,resp);}}/*** 處理注冊的功能* @param req* @param resp* @throws ServletException* @throws IOException*/protected void regist(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {// 1、獲取請求的參數String username = req.getParameter("username");String password = req.getParameter("password");String email = req.getParameter("email");String code = req.getParameter("code");// Map<String, String[]> parameterMap = req.getParameterMap(); // for (Map.Entry<String, String[]> entry:parameterMap.entrySet()) { // System.out.println(entry.getKey()+"="+ Arrays.asList(entry.getValue())); // }// User user=new User(); // WebUtils.copyParamToBean(req,user);//注入賦值，與User類中setXxx對應User user = WebUtils.copyParamToBean(req.getParameterMap(),new User());//注入賦值，與User類中setXxx對應// 2、檢查驗證碼是否正確 ===寫死，要求驗證碼為：abcdeif ("abcde".equalsIgnoreCase(code)){ // 3、檢查用戶名是否可用if (userService.existUsername(username)){System.out.println("用戶名["+username+"]已存在！");// 把回顯信息保存到Request域中req.setAttribute("msg","用戶名已存在！！");req.setAttribute("username",username);req.setAttribute("email",email); // 跳回注冊頁面req.getRequestDispatcher("/pages/user/regist.jsp").forward(req,resp);}else { // 可用 調用Service保存到數據庫userService.registUser(new User(null,username,password,email)); // 跳到注冊成功束面regist_success.jspreq.getRequestDispatcher("/pages/user/regist_success.jsp").forward(req,resp);}}else {// 把回顯信息保存到Request域中req.setAttribute("msg","驗證碼錯誤！！");req.setAttribute("username",username);req.setAttribute("email",email);System.out.println("驗證碼["+code+"]錯誤，");req.getRequestDispatcher("/pages/user/regist.jsp").forward(req,resp);}}}總結
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