项目实战系列: 家居购项目 第一部分

代码实现
1.创建数据库和表

-- 创建家居网购需要的数据库和表
-- 删除数据库
DROP DATABASE IF EXISTS home_furnishing;-- 删除表
DROP TABLE member;-- 创建数据库
CREATE DATABASE home_furnishing;-- 切换
USE home_furnishing;-- 创建会员表
CREATE TABLE member (id INT PRIMARY KEY AUTO_INCREMENT,username VARCHAR(32) NOT NULL DEFAULT '' UNIQUE,`password` VARCHAR(32) NOT NULL,email VARCHAR(64)
)CHARSET utf8 ENGINE INNODB;-- 插入数据
INSERT INTO member VALUES(NULL, 'admin', MD5('admin'), '978964140@qq.com');
INSERT INTO member VALUES(NULL, 'zhaozhiwei', MD5('zhaozhiwei'), '978964140@qq.com');
INSERT INTO member(id, username, `password`, email) VALUES(NULL, 'tom', MD5('tom'), 'tom@sohu.com');-- 查询
SELECT * FROM member;
SELECT id, username, `password`, email FROM member WHERE username = 'admine'
SELECT id, username, `password`, email FROM member WHERE username = 'admin123' AND `password` = MD5('123456');UPDATE member SET `password`=MD5('admin') WHERE username='admin';

2.创建实体类src/com/zzw/furns/entity/Member.java 满汉楼项目参考
无参构造器和set方法. get方法

public class Member {private Integer id;private String username;private String password;private String email;//无参构造器, 底层反射用public Member() {}//提供了有参构造器,必须提供无参构造器public Member(Integer id, String username, String password, String email) {this.id = id;this.username = username;this.password = password;this.email = email;}
}

3.从满汉楼项目引入BasicDAO.java, JdbcUtilsByDruid.java, Druid.properties

4.修改Druid配置文件要连接的数据库名, 确保用户名密码正确. url后面是做批处理用的

5.修改JdbcUtilsByDruid的路径

6.配置快捷键

7.测试, 新建src/com/zzw/furns/test/JdbcUtilsByDruidTest.java

@SuppressWarnings({"all"})
public class JdbcUtilsByDruidTest {@Testpublic void getConnection() {Connection connection = JdbcUtilsByDruid.getConnection();System.out.println(connection);JdbcUtilsByDruid.close(null, null, connection);}
}

8.新建src/com/zzw/furns/dao/MemberDao.java

public interface MemberDAO {//小伙伴需要自己分析, 需要哪些方法//提供一个通过用户名返回对应的Memberpublic Member queryMemberByUsername(String username);//提供一个 保存Member对象到数据库Member表 的方法public int saveMember(Member member);
}

9.新建src/com/zzw/furns/dao/impl/MemberDaoImpl.java

public class MemberDAOImpl extends BasicDAO<Member> implements MemberDAO {/*** 通过用户名返回对应的Member* @param username 用户名* @return 对应的Member, 如果没有该Member返回null*/@Overridepublic Member queryMemberByUsername(String username) {//现在sqlyog测试, 然后再拿到程序中, 这样可以提高我们的开发效率, 减少不必要的bugString sql = "SELECT id, username, `password`, email FROM member WHERE username = ?";Member member = querySingle(sql, Member.class, username);return member;}/*** 保存一个会员* @param member 传入一个Member对象* @return 如果返回-1, 就是失败; 返回其它的数字, 就是受影响的行数*/@Overridepublic int saveMember(Member member) {//连同单引号一并换成 ? , 它会自动加上单引号String sql = "INSERT INTO member(id, username, `password`, email) " +"VALUES(NULL, ?, MD5(?), ?)";int updateRows = update(sql, member.getUsername(), member.getPassword(), member.getEmail());return updateRows;}
}

10.测试, 新建src/com/zzw/furns/test/MemberDAOTest.java

public class MemberDAOTest {private MemberDAO memberDAO = new MemberDAOImpl();@Testpublic void queryMemberByUsernameTest() {if (memberDAO.queryMemberByUsername("tome") == null) {System.out.println("该用户名不存在");} else {System.out.println("该用户名存在");}}@Testpublic void saveMember() {Member member =new Member(null, "king", "king", "king@sohu.com");if (memberDAO.saveMember(member) == 1) {System.out.println("添加成功");} else {System.out.println("添加失败");}}
}

11.新建src/com/zzw/furns/service/MemberService.java

public interface MemberService {//注册用户public boolean registerMember(Member member);//判断用户名是否存在public boolean isExistsByUsername(String username);
}

12.新建src/com/zzw/furns/service/MemberServiceImpl.java

public class MemberServiceImpl implements MemberService {//定义MemberDAO属性private MemberDAO memberDAO = new MemberDAOImpl();/*** 判断用户名是否存在** @param username 用户名* @return 如果存在返回true, 否则返回false*/@Overridepublic boolean isExistsByUsername(String username) {//小技巧: 如果看某个方法:// (1)ctrl+b 定位到memberDAO的编译类型中的方法// (2)如果使用ctrl+alt+b 会定位到实现类的方法//如果有多个类实现了该方法, 会让你选择return memberDAO.queryMemberByUsername(username) == null ? false : true;}@Overridepublic boolean registerMember(Member member) {return memberDAO.saveMember(member) == 1 ? true : false;}
}

13.测试, 新建src/com/zzw/furns/test/MemberServiceTest.java

public class MemberServiceTest {private MemberService memberService = new MemberServiceImpl();@Testpublic void isExistsByUsernameTest() {if (memberService.isExistsByUsername("king")) {System.out.println("用户名存在");} else {System.out.println("用户名不存在");}}@Testpublic void registerMember() {//构建一个用来测试的Member对象Member member = new Member(null, "tom", "tom", "tom@sohu.com");if (memberService.registerMember(member)) {System.out.println("注册用户成功");} else {System.out.println("注册用户失败");}}
}

14.接通web层, 新建src/com/zzw/furns/web/RegisterServlet.java

public class RegisterServlet extends HttpServlet {private MemberService memberService = new MemberServiceImpl();@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doPost(request, response);}@Overrideprotected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {String username = request.getParameter("username");String password = request.getParameter("password");String email = request.getParameter("email");Member member = new Member(null, username, password, email);if (!memberService.isExistsByUsername(member)) {//用户名可用if (memberService.registerMember(member)) {System.out.println("注册成功");request.getRequestDispatcher("/views/member/register_ok.jsp").forward(request, response);} else {System.out.println("注册失败");request.getRequestDispatcher("/views/member/register_fail.jsp").forward(request, response);}} else {//用户名不可用request.setAttribute("msg", "用户名" + username + "不可用");request.setAttribute("username", username);//回显用户名request.setAttribute("active", "register_tab");request.getRequestDispatcher("/views/member/login.jsp").forward(request, response);}}
}

<servlet><servlet-name>RegisterServlet</servlet-name><servlet-class>com.zzw.furns.web.RegisterServlet</servlet-class>
</servlet>
<servlet-mapping><servlet-name>RegisterServlet</servlet-name><url-pattern>/register</url-pattern>
</servlet-mapping>

15.前端(错误信息回显), 修改web/views/member/login.jsp

2)cart.jsp, checkout.jsp, order.jsp,order_detail.jsp均可跳转

<!-- Header Logo Start -->
<div class="col-auto align-self-center"><div class="header-logo"><a href="index.jsp"><img src="assets/images/logo/logo.png" alt="Site Logo"/></a></div>
</div>
<!-- Header Logo End --><!-- Header Action Start -->
<div class="col align-self-center"><div class="header-actions"><!-- Single Wedge Start -->欢迎: ${sessionScope.member.username}&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<div class="header-bottom-set dropdown"><a href="orderServlet?action=listOrderByMemberId">订单管理</a></div><div class="header-bottom-set dropdown"><a href="memberServlet?action=logout">安全退出</a></div><!-- Single Wedge End --></div>
</div>
<!-- Header Action End -->

3)修改web/views/member/login.jsp注册表单

<!--会员注册-->
<span class="errorMsg"style="float: right; font-weight: bold; color: lightgray; font-size: 20pt; margin-left: 10px;">${msg}</span>
<form action="registerServlet" method="post">
</form>
<a id="register_tab" data-bs-toggle="tab" href="#lg2"><h4>会员注册</h4>
</a>

4)修改loign.jsp - 注册失败回显信息时, 停留在注册的tab内

$(function () {//模拟一个点击事件, 选中注册//决定是显示登陆还是显示注册tab//如果注册失败, 显示注册tab, 而不能是默认的登录tabif (${requestScope.active == "register_tab"}) {$("#register_tab")[0].click();} else {$("#login_tab")[0].click();}
}

<a id="login_tab" data-bs-toggle="tab" href="#lg1"><h4>会员登录</h4>
</a>
<a id="register_tab" data-bs-toggle="tab" href="#lg2"><h4>会员注册</h4>
</a>

5)加入register_ok.jsp, register_fail.jsp页面

<a class="active"  href="index.jsp"><h4>注册成功, 返回首页</h4>
</a>

<a class="active"  href="views/member/login.jsp"><h4>注册失败, 重新注册</h4>
</a>

16.删除点击注册后的拦截代码web/views/member/login.jsp

//这里暂时不提交=>显示验证通过
$("span.errorMsg").text("验证通过");
return false;

17.测试

🐇会员登陆

思路分析
1.输入用户名和密码后提交
2.如果输入有误，则给出提示
3.判断会员是否存在
4.会员存在于数据库, 显示登录成功页面
5.否则, 返回登陆页面, 重新登陆
6.要求改进登陆密码为md5加密

程序框架图

代码实现
1.修改src/com/zzw/furns/dao/MemberDao.java

2.修改src/com/zzw/furns/dao/MemberDaoImpl.java

/*** 根据用户名和密码查询对应的Member对象* @param username 用户名* @param password 密码* @return 对应的Member对象, 如果没有 则返回null*/
@Override
public Member queryMemberByUsernameAndPassword(String username, String password) {String sql = "SELECT id, username, `password`, email FROM member WHERE username = ? AND `password` = MD5(?);";Member member = querySingle(sql, Member.class, username, password);return member;
}

3.测试(不要忘了测试)

@Test
public void queryMemberByUsernameAndPassword() {String username = "admin";String password = "123456";Member member = memberDao.queryMemberByUsernameAndPassword(username, password);if (member == null) {System.out.println("用户名或密码错误");} else {System.out.println("登录成功");}
}

快捷键

4.修改src/com/zzw/furns/service/MemberService.java

public interface MemberService {/*** 根据传入的member信息, 返回对应在DB中的member对象* @param member 是根据用户登录构建一个member* @return 返回的是对应的DB中的member对象, 如果不存在返回null*/public Member login(Member member);
}

5.修改src/com/zzw/furns/service/impl/MemberServiceImpl.java

public class MemberServiceImpl implements MemberService {//定义MemberDAO属性private MemberDAO memberDAO = new MemberDAOImpl();/*** 判断用户名和密码是否存在* @param username 用户名* @param password 密码* @return*/@Overridepublic Member login(Member member) {//返回一个对象return memberDAO.queryMemberByUsernameAndPassword(member.getUsername(), member.getPassword());}
}

6.测试(不要忘了测试)

@Test
public void login() {Member member = new Member(null, "adminx", "admin", null);Member login = memberService.login(member);System.out.println("login= " + login);
}

7.修改src/com/zzw/furns/web/LoginServlet.java

public class LoginServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doPost(request, response);}private MemberService memberService = new MemberServiceImpl();@Overrideprotected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//如果在登陆界面用户没有输入内容, 后台接收到的是""String username = request.getParameter("username");String password = request.getParameter("password");Member member = new Member(null, username, password, null);if (memberService.login(member) != null) {//用户存在DBSystem.out.println("用户存在, 登陆成功...");request.getRequestDispatcher("/views/member/login_ok.html").forward(request, response);} else {//用户不存在System.out.println("登陆失败, 返回登陆页面");request.setAttribute("username", username);request.setAttribute("msg", "登陆失败");request.getRequestDispatcher("/views/member/login.jsp").forward(request, response);}}
}

配置LoginServlet

<servlet><servlet-name>LoginServlet</servlet-name><servlet-class>com.zzw.furns.web.LoginServlet</servlet-class>
</servlet>
<servlet-mapping><servlet-name>LoginServlet</servlet-name><url-pattern>/login</url-pattern>
</servlet-mapping>

8.修改web/views/member/login.jsp

$("button:first")[0].onclick = function () {//采用过关斩将法//正则表达式验证用户名var usernameValue = $("form:first")[0].childNodes[3].value;var usernamePattern = /^\w{6,10}$/;if (!usernamePattern.test(usernameValue)) {$("span[class='errorMsg2']").text("用户名格式不对, 需要6-10个字符(大小写字母,数字,下划线)");return false;}//验证密码var passwordValue = $("form:first")[0].childNodes[5].value;var passwordPattern = /^\w{6,10}$/;if (!passwordPattern.test(passwordValue)) {$("span.errorMsg2").text("密码格式不对, 需要6-10个字符(大小写字母,数字,下划线)");return false;}
}

<!--会员登录-->
<span class="errorMsg2"style="float: right; font-weight: bold; color: lightgray; font-size: 20pt; margin-left: 10px;">${msg}</span>
<form action="loginServlet" method="post"><input type="text" name="username" value="${username}" placeholder="Username"/><input type="password" name="password" placeholder="Password"/><div class="button-box"><div class="login-toggle-btn"><input type="checkbox"/><a class="flote-none" href="javascript:void(0)">Remember me</a><a href="#">Forgot Password?</a></div><button type="submit"><span>Login</span></button></div>
</form>

9.添加login_ok.jsp, 参考

10.快捷键学习

11.测试