超市订单管理系统SMBMS

javaweb实战项目学习笔记，参考视频：狂神说Java

1、基本架构

2、数据库

数据库代码如下：

CREATE DATABASE `smbms`;

USE `smbms`;

DROP TABLE IF EXISTS `smbms_address`;

CREATE TABLE `smbms_address` (
  `id` BIGINT(20) NOT NULL AUTO_INCREMENT COMMENT '主键ID',
  `contact` VARCHAR(15) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '联系人姓名',
  `addressDesc` VARCHAR(50) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '收货地址明细',
  `postCode` VARCHAR(15) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '邮编',
  `tel` VARCHAR(20) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '联系人电话',
  `createdBy` BIGINT(20) DEFAULT NULL COMMENT '创建者',
  `creationDate` DATETIME DEFAULT NULL COMMENT '创建时间',
  `modifyBy` BIGINT(20) DEFAULT NULL COMMENT '修改者',
  `modifyDate` DATETIME DEFAULT NULL COMMENT '修改时间',
  `userId` BIGINT(20) DEFAULT NULL COMMENT '用户ID',
  PRIMARY KEY (`id`)
) ENGINE=INNODB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;


INSERT  INTO `smbms_address`(`id`,`contact`,`addressDesc`,`postCode`,`tel`,`createdBy`,`creationDate`,`modifyBy`,`modifyDate`,`userId`) VALUES (1,'王丽','北京市东城区东交民巷44号','100010','13678789999',1,'2016-04-13 00:00:00',NULL,NULL,1),(2,'张红丽','北京市海淀区丹棱街3号','100000','18567672312',1,'2016-04-13 00:00:00',NULL,NULL,1),(3,'任志强','北京市东城区美术馆后街23号','100021','13387906742',1,'2016-04-13 00:00:00',NULL,NULL,1),(4,'曹颖','北京市朝阳区朝阳门南大街14号','100053','13568902323',1,'2016-04-13 00:00:00',NULL,NULL,2),(5,'李慧','北京市西城区三里河路南三巷3号','100032','18032356666',1,'2016-04-13 00:00:00',NULL,NULL,3),(6,'王国强','北京市顺义区高丽营镇金马工业区18号','100061','13787882222',1,'2016-04-13 00:00:00',NULL,NULL,3);


DROP TABLE IF EXISTS `smbms_bill`;

CREATE TABLE `smbms_bill` (
  `id` BIGINT(20) NOT NULL AUTO_INCREMENT COMMENT '主键ID',
  `billCode` VARCHAR(20) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '账单编码',
  `productName` VARCHAR(20) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '商品名称',
  `productDesc` VARCHAR(50) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '商品描述',
  `productUnit` VARCHAR(10) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '商品单位',
  `productCount` DECIMAL(20,2) DEFAULT NULL COMMENT '商品数量',
  `totalPrice` DECIMAL(20,2) DEFAULT NULL COMMENT '商品总额',
  `isPayment` INT(10) DEFAULT NULL COMMENT '是否支付（1：未支付 2：已支付）',
  `createdBy` BIGINT(20) DEFAULT NULL COMMENT '创建者（userId）',
  `creationDate` DATETIME DEFAULT NULL COMMENT '创建时间',
  `modifyBy` BIGINT(20) DEFAULT NULL COMMENT '更新者（userId）',
  `modifyDate` DATETIME DEFAULT NULL COMMENT '更新时间',
  `providerId` BIGINT(20) DEFAULT NULL COMMENT '供应商ID',
  PRIMARY KEY (`id`)
) ENGINE=INNODB AUTO_INCREMENT=19 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;


INSERT  INTO `smbms_bill`(`id`,`billCode`,`productName`,`productDesc`,`productUnit`,`productCount`,`totalPrice`,`isPayment`,`createdBy`,`creationDate`,`modifyBy`,`modifyDate`,`providerId`) VALUES (2,'BILL2016_002','香皂、肥皂、药皂','日用品-皂类','块','1000.00','10000.00',2,1,'2016-03-23 04:20:40',NULL,NULL,13),(3,'BILL2016_003','大豆油','食品-食用油','斤','300.00','5890.00',2,1,'2014-12-14 13:02:03',NULL,NULL,6),(4,'BILL2016_004','橄榄油','食品-进口食用油','斤','200.00','9800.00',2,1,'2013-10-10 03:12:13',NULL,NULL,7),(5,'BILL2016_005','洗洁精','日用品-厨房清洁','瓶','500.00','7000.00',2,1,'2014-12-14 13:02:03',NULL,NULL,9),(6,'BILL2016_006','美国大杏仁','食品-坚果','袋','300.00','5000.00',2,1,'2016-04-14 06:08:09',NULL,NULL,4),(7,'BILL2016_007','沐浴液、精油','日用品-沐浴类','瓶','500.00','23000.00',1,1,'2016-07-22 10:10:22',NULL,NULL,14),(8,'BILL2016_008','不锈钢盘碗','日用品-厨房用具','个','600.00','6000.00',2,1,'2016-04-14 05:12:13',NULL,NULL,14),(9,'BILL2016_009','塑料杯','日用品-杯子','个','350.00','1750.00',2,1,'2016-02-04 11:40:20',NULL,NULL,14),(10,'BILL2016_010','豆瓣酱','食品-调料','瓶','200.00','2000.00',2,1,'2013-10-29 05:07:03',NULL,NULL,8),(11,'BILL2016_011','海之蓝','饮料-国酒','瓶','50.00','10000.00',1,1,'2016-04-14 16:16:00',NULL,NULL,1),(12,'BILL2016_012','芝华士','饮料-洋酒','瓶','20.00','6000.00',1,1,'2016-09-09 17:00:00',NULL,NULL,1),(13,'BILL2016_013','长城红葡萄酒','饮料-红酒','瓶','60.00','800.00',2,1,'2016-11-14 15:23:00',NULL,NULL,1),(14,'BILL2016_014','泰国香米','食品-大米','斤','400.00','5000.00',2,1,'2016-10-09 15:20:00',NULL,NULL,3),(15,'BILL2016_015','东北大米','食品-大米','斤','600.00','4000.00',2,1,'2016-11-14 14:00:00',NULL,NULL,3),(16,'BILL2016_016','可口可乐','饮料','瓶','2000.00','6000.00',2,1,'2012-03-27 13:03:01',NULL,NULL,2),(17,'BILL2016_017','脉动','饮料','瓶','1500.00','4500.00',2,1,'2016-05-10 12:00:00',NULL,NULL,2),(18,'BILL2016_018','哇哈哈','饮料','瓶','2000.00','4000.00',2,1,'2015-11-24 15:12:03',NULL,NULL,2);

DROP TABLE IF EXISTS `smbms_provider`;

CREATE TABLE `smbms_provider` (
  `id` BIGINT(20) NOT NULL AUTO_INCREMENT COMMENT '主键ID',
  `proCode` VARCHAR(20) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '供应商编码',
  `proName` VARCHAR(20) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '供应商名称',
  `proDesc` VARCHAR(50) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '供应商详细描述',
  `proContact` VARCHAR(20) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '供应商联系人',
  `proPhone` VARCHAR(20) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '联系电话',
  `proAddress` VARCHAR(50) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '地址',
  `proFax` VARCHAR(20) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '传真',
  `createdBy` BIGINT(20) DEFAULT NULL COMMENT '创建者（userId）',
  `creationDate` DATETIME DEFAULT NULL COMMENT '创建时间',
  `modifyDate` DATETIME DEFAULT NULL COMMENT '更新时间',
  `modifyBy` BIGINT(20) DEFAULT NULL COMMENT '更新者（userId）',
  PRIMARY KEY (`id`)
) ENGINE=INNODB AUTO_INCREMENT=16 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;


INSERT  INTO `smbms_provider`(`id`,`proCode`,`proName`,`proDesc`,`proContact`,`proPhone`,`proAddress`,`proFax`,`createdBy`,`creationDate`,`modifyDate`,`modifyBy`) VALUES (1,'BJ_GYS001','北京三木堂商贸有限公司','长期合作伙伴，主营产品:茅台、五粮液、郎酒、酒鬼酒、泸州老窖、赖茅酒、法国红酒等','张国强','13566667777','北京市丰台区育芳园北路','010-58858787',1,'2013-03-21 16:52:07',NULL,NULL),(2,'HB_GYS001','石家庄帅益食品贸易有限公司','长期合作伙伴，主营产品:饮料、水饮料、植物蛋白饮料、休闲食品、果汁饮料、功能饮料等','王军','13309094212','河北省石家庄新华区','0311-67738876',1,'2016-04-13 04:20:40',NULL,NULL),(3,'GZ_GYS001','深圳市泰香米业有限公司','初次合作伙伴，主营产品：良记金轮米,龙轮香米等','郑程瀚','13402013312','广东省深圳市福田区深南大道6006华丰大厦','0755-67776212',1,'2014-03-21 16:56:07',NULL,NULL),(4,'GZ_GYS002','深圳市喜来客商贸有限公司','长期合作伙伴，主营产品：坚果炒货.果脯蜜饯.天然花茶.营养豆豆.特色美食.进口食品.海味零食.肉脯肉','林妮','18599897645','广东省深圳市福龙工业区B2栋3楼西','0755-67772341',1,'2013-03-22 16:52:07',NULL,NULL),(5,'JS_GYS001','兴化佳美调味品厂','长期合作伙伴，主营产品：天然香辛料、鸡精、复合调味料','徐国洋','13754444221','江苏省兴化市林湖工业区','0523-21299098',1,'2015-11-22 16:52:07',NULL,NULL),(6,'BJ_GYS002','北京纳福尔食用油有限公司','长期合作伙伴，主营产品：山茶油、大豆油、花生油、橄榄油等','马莺','13422235678','北京市朝阳区珠江帝景1号楼','010-588634233',1,'2012-03-21 17:52:07',NULL,NULL),(7,'BJ_GYS003','北京国粮食用油有限公司','初次合作伙伴，主营产品：花生油、大豆油、小磨油等','王驰','13344441135','北京大兴青云店开发区','010-588134111',1,'2016-04-13 00:00:00',NULL,NULL),(8,'ZJ_GYS001','慈溪市广和绿色食品厂','长期合作伙伴，主营产品：豆瓣酱、黄豆酱、甜面酱，辣椒，大蒜等农产品','薛圣丹','18099953223','浙江省宁波市慈溪周巷小安村','0574-34449090',1,'2013-11-21 06:02:07',NULL,NULL),(9,'GX_GYS001','优百商贸有限公司','长期合作伙伴，主营产品：日化产品','李立国','13323566543','广西南宁市秀厢大道42-1号','0771-98861134',1,'2013-03-21 19:52:07',NULL,NULL),(10,'JS_GYS002','南京火头军信息技术有限公司','长期合作伙伴，主营产品：不锈钢厨具等','陈女士','13098992113','江苏省南京市浦口区浦口大道1号新城总部大厦A座903室','025-86223345',1,'2013-03-25 16:52:07',NULL,NULL),(11,'GZ_GYS003','广州市白云区美星五金制品厂','长期合作伙伴，主营产品：海绵床垫、坐垫、靠垫、海绵枕头、头枕等','梁天','13562276775','广州市白云区钟落潭镇福龙路20号','020-85542231',1,'2016-12-21 06:12:17',NULL,NULL),(12,'BJ_GYS004','北京隆盛日化科技','长期合作伙伴，主营产品：日化环保清洗剂，家居洗涤专卖、洗涤用品网、墙体除霉剂、墙面霉菌清除剂等','孙欣','13689865678','北京市大兴区旧宫','010-35576786',1,'2014-11-21 12:51:11',NULL,NULL),(13,'SD_GYS001','山东豪克华光联合发展有限公司','长期合作伙伴，主营产品：洗衣皂、洗衣粉、洗衣液、洗洁精、消杀类、香皂等','吴洪转','13245468787','山东济阳济北工业区仁和街21号','0531-53362445',1,'2015-01-28 10:52:07',NULL,NULL),(14,'JS_GYS003','无锡喜源坤商行','长期合作伙伴，主营产品：日化品批销','周一清','18567674532','江苏无锡盛岸西路','0510-32274422',1,'2016-04-23 11:11:11',NULL,NULL),(15,'ZJ_GYS002','乐摆日用品厂','长期合作伙伴，主营产品：各种中、高档塑料杯，塑料乐扣水杯（密封杯）、保鲜杯（保鲜盒）、广告杯、礼品杯','王世杰','13212331567','浙江省金华市义乌市义东路','0579-34452321',1,'2016-08-22 10:01:30',NULL,NULL);


DROP TABLE IF EXISTS `smbms_role`;

CREATE TABLE `smbms_role` (
  `id` BIGINT(20) NOT NULL AUTO_INCREMENT COMMENT '主键ID',
  `roleCode` VARCHAR(15) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '角色编码',
  `roleName` VARCHAR(15) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '角色名称',
  `createdBy` BIGINT(20) DEFAULT NULL COMMENT '创建者',
  `creationDate` DATETIME DEFAULT NULL COMMENT '创建时间',
  `modifyBy` BIGINT(20) DEFAULT NULL COMMENT '修改者',
  `modifyDate` DATETIME DEFAULT NULL COMMENT '修改时间',
  PRIMARY KEY (`id`)
) ENGINE=INNODB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;


INSERT  INTO `smbms_role`(`id`,`roleCode`,`roleName`,`createdBy`,`creationDate`,`modifyBy`,`modifyDate`) VALUES (1,'SMBMS_ADMIN','系统管理员',1,'2016-04-13 00:00:00',NULL,NULL),(2,'SMBMS_MANAGER','经理',1,'2016-04-13 00:00:00',NULL,NULL),(3,'SMBMS_EMPLOYEE','普通员工',1,'2016-04-13 00:00:00',NULL,NULL);


DROP TABLE IF EXISTS `smbms_user`;

CREATE TABLE `smbms_user` (
  `id` BIGINT(20) NOT NULL AUTO_INCREMENT COMMENT '主键ID',
  `userCode` VARCHAR(15) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '用户编码',
  `userName` VARCHAR(15) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '用户名称',
  `userPassword` VARCHAR(15) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '用户密码',
  `gender` INT(10) DEFAULT NULL COMMENT '性别（1:女、 2:男）',
  `birthday` DATE DEFAULT NULL COMMENT '出生日期',
  `phone` VARCHAR(15) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '手机',
  `address` VARCHAR(30) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '地址',
  `userRole` BIGINT(20) DEFAULT NULL COMMENT '用户角色（取自角色表-角色id）',
  `createdBy` BIGINT(20) DEFAULT NULL COMMENT '创建者（userId）',
  `creationDate` DATETIME DEFAULT NULL COMMENT '创建时间',
  `modifyBy` BIGINT(20) DEFAULT NULL COMMENT '更新者（userId）',
  `modifyDate` DATETIME DEFAULT NULL COMMENT '更新时间',
  PRIMARY KEY (`id`)
) ENGINE=INNODB AUTO_INCREMENT=16 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

INSERT  INTO `smbms_user`(`id`,`userCode`,`userName`,`userPassword`,`gender`,`birthday`,`phone`,`address`,`userRole`,`createdBy`,`creationDate`,`modifyBy`,`modifyDate`) VALUES (1,'admin','系统管理员','1234567',1,'1983-10-10','13688889999','北京市海淀区成府路207号',1,1,'2013-03-21 16:52:07',NULL,NULL),(2,'liming','李明','0000000',2,'1983-12-10','13688884457','北京市东城区前门东大街9号',2,1,'2014-12-31 19:52:09',NULL,NULL),(5,'hanlubiao','韩路彪','0000000',2,'1984-06-05','18567542321','北京市朝阳区北辰中心12号',2,1,'2014-12-31 19:52:09',NULL,NULL),(6,'zhanghua','张华','0000000',1,'1983-06-15','13544561111','北京市海淀区学院路61号',3,1,'2013-02-11 10:51:17',NULL,NULL),(7,'wangyang','王洋','0000000',2,'1982-12-31','13444561124','北京市海淀区西二旗辉煌国际16层',3,1,'2014-06-11 19:09:07',NULL,NULL),(8,'zhaoyan','赵燕','0000000',1,'1986-03-07','18098764545','北京市海淀区回龙观小区10号楼',3,1,'2016-04-21 13:54:07',NULL,NULL),(10,'sunlei','孙磊','0000000',2,'1981-01-04','13387676765','北京市朝阳区管庄新月小区12楼',3,1,'2015-05-06 10:52:07',NULL,NULL),(11,'sunxing','孙兴','0000000',2,'1978-03-12','13367890900','北京市朝阳区建国门南大街10号',3,1,'2016-11-09 16:51:17',NULL,NULL),(12,'zhangchen','张晨','0000000',1,'1986-03-28','18098765434','朝阳区管庄路口北柏林爱乐三期13号楼',3,1,'2016-08-09 05:52:37',1,'2016-04-14 14:15:36'),(13,'dengchao','邓超','0000000',2,'1981-11-04','13689674534','北京市海淀区北航家属院10号楼',3,1,'2016-07-11 08:02:47',NULL,NULL),(14,'yangguo','杨过','0000000',2,'1980-01-01','13388886623','北京市朝阳区北苑家园茉莉园20号楼',3,1,'2015-02-01 03:52:07',NULL,NULL),(15,'zhaomin','赵敏','0000000',1,'1987-12-04','18099897657','北京市昌平区天通苑3区12号楼',2,1,'2015-09-12 12:02:12',NULL,NULL);

3、项目搭建准备工作

（1）搭建一个maven web项目

（2）配置Tomcat并测试运行

（3）导入项目中遇到的jar包：jsp、Servlet、mysql驱动、jstl、standard、junit…

（4）创建包项目结构

（5）编写实体类：ORM映射：表-类映射

（6）编写基础公共类

tips：项目建议从底层往上写

数据库配置文件

driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/smbms?serverTimezone=UTC
username=root
password=333

编写数据库的公共类

private static String driver;
private static String url;
private static String username;
private static String password;

//1.静态代码块，类加载时完成初始化
static{
    Properties prop = new Properties();
    //通过类加载器读取对应的资源
    InputStream is = BaseDao.class.getClassLoader().getResourceAsStream("db.properties");
    try {
        prop.load(is);
    } catch (IOException e) {
        e.printStackTrace();
    }
    driver = prop.getProperty("driver");
    url = prop.getProperty("url");
    username = prop.getProperty("username");
    password = prop.getProperty("password");
}
//获取数据库的连接
public static Connection getConn(){
    Connection conn = null;
    try {
        Class.forName(driver);
        conn = DriverManager.getConnection(url, username, password);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return conn;
}
//编写查询公共类
public static ResultSet execute(Connection conn,String sql,Object[] params,ResultSet rs,PreparedStatement ps) throws SQLException {
    ps = conn.prepareStatement(sql);
    for (int i = 0; i < params.length; i++) {
        ps.setObject(i+1,params[i]);
    }
    rs = ps.executeQuery();
    return rs;
}
//编写增删改公共方法
public static int execute(Connection conn,String sql,Object[] params,PreparedStatement ps) throws SQLException {
    ps = conn.prepareStatement(sql);
    for (int i = 0; i < params.length; i++) {
        ps.setObject(i+1,params[i]);
    }
    int updateRows = ps.executeUpdate();
    return updateRows;
}
//释放资源
public static boolean closeResource(Connection conn,PreparedStatement ps,ResultSet rs){
    boolean flag = true;
    if(rs != null){
        try {
            rs.close();
            //GC回收
            rs = null;
        } catch (SQLException e) {
            e.printStackTrace();
            flag = false;
        }
    }
    if(ps != null){
        try {
            ps.close();
            //GC回收
            ps = null;
        } catch (SQLException e) {
            e.printStackTrace();
            flag = false;
        }
    }
    if(conn != null){
        try {
            conn.close();
            //GC回收
            conn = null;
        } catch (SQLException e) {
            e.printStackTrace();
            flag = false;
        }
    }
    return flag;
}

编写字符编码过滤器

在filter中建立CharacterEncodingFilter类

public class CharacterEncodingFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        servletRequest.setCharacterEncoding("utf-8");
        servletResponse.setCharacterEncoding("utf-8");
        filterChain.doFilter(servletRequest,servletResponse);
    }
    @Override
    public void destroy() {

    }
}

xml中注册

<!--字符编码过滤器-->
<filter>
    <filter-name>CharacterEncodingFilter</filter-name>
    <filter-class>com.zqy.filter.CharacterEncodingFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>CharacterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

（7）导入静态资源（私我索要）

4、登录功能实现

编写前端

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>系统登录 - 超市订单管理系统</title>
    <link type="text/css" rel="stylesheet" href="${pageContext.request.contextPath }/css/style.css" />
    <script type="text/javascript">
    </script>
</head>
<body class="login_bg">
<section class="loginBox">
    <header class="loginHeader">
        <h1>超市订单管理系统</h1>
    </header>
    <section class="loginCont">
        <form class="loginForm" action="${pageContext.request.contextPath }/login.do"  name="actionForm" id="actionForm"  method="post" >
            <div class="info">${error}</div>
            <div class="inputbox">
                <label>用户名：</label>
                <input type="text" class="input-text" id="userCode" name="userCode" placeholder="请输入用户名" required/>
            </div>
            <div class="inputbox">
                <label>密码：</label>
                <input type="password" id="userPassword" name="userPassword" placeholder="请输入密码" required/>
            </div>
            <div class="subBtn">

                <input type="submit" value="登录"/>
                <input type="reset" value="重置"/>
            </div>
        </form>
    </section>
</section>
</body>
</html>

设置首页

<!--设置欢迎界面-->
<welcome-file-list>
    <welcome-file>login.jsp</welcome-file>
</welcome-file-list>

编写dao层用户登录的接口

public interface UserDao {
    //得到登录的用户
    public User getLoginUser(Connection conn,String UserCode,String userPassword) throws SQLException;
}

编写dao接口的实现类

public class UserDaoImpl implements UserDao{
    @Override
    public User getLoginUser(Connection conn, String UserCode,String password) throws SQLException {
        PreparedStatement pstm = null;
        ResultSet rs = null;
        User user = null;
        if(conn != null){
            String sql = "select * from smbms_user where userCode = ? and userPassword = ?";
            Object[] params = {UserCode,password};
            rs = BaseDao.execute(conn,pstm,rs,sql,params);
            if(rs.next()){
                user = new User();
                user.setId(rs.getInt("id"));
                user.setUserCode(rs.getString("userCode"));
                user.setUserName(rs.getString("userName"));
                user.setUserPassword(rs.getString("userPassword"));
                user.setGender(rs.getInt("gender"));
                user.setBirthday(rs.getDate("birthday"));
                user.setPhone(rs.getString("phone"));
                user.setAddress(rs.getString("address"));
                user.setUserRole(rs.getInt("userRole"));
                user.setCreatedBy(rs.getInt("createdBy"));
                user.setCreationDate(rs.getTimestamp("creationDate"));
                user.setModifyBy(rs.getInt("modifyBy"));
                user.setModifyDate(rs.getTimestamp("modifyDate"));
            }
            BaseDao.closeResource(null,pstm,rs);
        }
        return user;
    }
}

业务层接口

public interface UserService {
    //用户登录
    public User login(String userCode,String password);
}

业务层实现类

public class UserServiceImpl implements UserService{
    //业务层都会调用dao层，所以我们要引入dao
    private UserDao userDao;

    public UserServiceImpl() {
        userDao = new UserDaoImpl();
    }

    @Override
    public User login(String userCode, String password) {
        Connection connection = BaseDao.getConn();
        User user = null;
        //通过业务层调用对应的具体的数据库操作
        try {
            user = userDao.getLoginUser(connection,userCode,password);

        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            BaseDao.closeResource(connection,null,null);
        }
        return user;
    }
}

编写Servlet

public class LoginServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //Servlet：控制层、调用业务层代码
        //获取用户名和密码
        String userCode = req.getParameter("userCode");
        String pwd = req.getParameter("userPassword");
        //和数据库中的密码进行对比，调用业务层
        UserService userService = new UserServiceImpl();
        User user = userService.login(userCode, pwd);
        if(user != null){
            //将用户的信息放入Session中
            req.getSession().setAttribute(Constants.USER_SESSION,user);
            //跳转到主页
            resp.sendRedirect("jsp/frame.jsp");
        }else {
            req.setAttribute("error","用户名或密码不正确");
            req.getRequestDispatcher("login.jsp").forward(req,resp);
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

注册Servlet

<servlet>
    <servlet-name>LoginServlet</servlet-name>
    <servlet-class>com.zqy.servlet.user.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>LoginServlet</servlet-name>
    <url-pattern>/login.do</url-pattern>
</servlet-mapping>

测试访问，确保以上功能成功

5、登录功能优化

注销功能：思路：移除Session，返回登录页面

<servlet>
    <servlet-name>LoginOutServlet</servlet-name>
    <servlet-class>com.zqy.servlet.user.LoginOutServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>LoginOutServlet</servlet-name>
    <url-pattern>/jsp/logout.do</url-pattern>

登录拦截器优化

编写一个过滤器并注册：

public class SysFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) servletRequest;
        HttpServletResponse resp = (HttpServletResponse) servletResponse;
        //过滤器，从Session中获取用户
        User user = (User) req.getSession().getAttribute(Constants.USER_SESSION);
        if(user == null){
            resp.sendRedirect("/smbms/error.jsp");
        }else {
            filterChain.doFilter(servletRequest,servletResponse);
        }
    }
    @Override
    public void destroy() {

    }
}

<!--用户登录过滤器-->
<filter>
    <filter-name>SysFilter</filter-name>
    <filter-class>com.zqy.filter.SysFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>SysFilter</filter-name>
    <url-pattern>/jsp/*</url-pattern>
</filter-mapping>

测试：登录、注销、权限，都要正确

6、密码修改功能实现

导入前端素材

1	<li><a href="../jsp/pwdmodify.jsp">密码修改</a></li>

UserDao接口

1 2	//修改密码 public int updatePwd(Connection connection,String UserCode,String userPassword) throws SQLException;

UserDao接口实现

@Override
public int updatePwd(Connection connection, String UserCode, String userPassword) throws SQLException {
    PreparedStatement pstm = null;
    int rowNum = 0;
    if(connection != null){
        String sql = "update smbms_user set userPassword = ? where userName";
        Object[] params = {userPassword,UserCode};
        rowNum = BaseDao.execute(connection, pstm, sql, params);
    }
    return rowNum;
}

UserService层

1 2	//根据用户ID修改密码 public boolean updatePwd(int id,String userPassword);

UserService实现类

@Override
public boolean updatePwd(int id, String userPassword) {
    Connection connection = BaseDao.getConn();
    try {
        int rowNum = userDao.updatePwd(connection,id,userPassword);
        if(rowNum > 0){
            return true;
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }finally {
        BaseDao.closeResource(connection,null,null);
    }
    return false;
}

Servlet考虑实现复用，提取出方法

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    String method = req.getParameter("method");
    if( method != null && method.equals("savepwd")){
        this.updatePwd(req,resp);
    }
}
public void updatePwd(HttpServletRequest req, HttpServletResponse resp){
        //从session里面拿ID
        Object object = req.getSession().getAttribute(Constants.USER_SESSION);
        String newPwd = req.getParameter("newpassword");
        if(object != null && !StringUtils.isNullOrEmpty(newPwd)){
            UserService userService = new UserServiceImpl();
            boolean flag = userService.updatePwd(((User) object).getId(), newPwd);
            if(flag){
                req.setAttribute("message","修改密码成功，请重新登录");
                //密码修改成功，移除当前Session
                req.getSession().removeAttribute(Constants.USER_SESSION);
            }else {
                req.setAttribute("message","修改密码失败");
            }
        }else {
            req.setAttribute("message","新密码错误");
        }
        try {
            req.getRequestDispatcher("pwdmodify.jsp").forward(req,resp);
        } catch (ServletException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

注册Servlet

<servlet>
    <servlet-name>UserServlet</servlet-name>
    <servlet-class>com.zqy.servlet.user.UserServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>UserServlet</servlet-name>
    <url-pattern>/jsp/user.do</url-pattern>
</servlet-mapping>

测试

7、密码修改功能优化Ajax

阿里巴巴的fastjson

<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.75</version>
</dependency>

后台代码修改

public class UserServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String method = req.getParameter("method");
        if( method != null && method.equals("savepwd")){
            this.updatePwd(req,resp);
        }else if(method!=null && method.equals("pwdmodify")){
            this.pwdModify(req, resp);
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
    //修改密码
    public void updatePwd(HttpServletRequest req, HttpServletResponse resp){
        //从session里面拿ID
        Object object = req.getSession().getAttribute(Constants.USER_SESSION);
        String newPwd = req.getParameter("newpassword");
        if(object != null && !StringUtils.isNullOrEmpty(newPwd)){
            UserService userService = new UserServiceImpl();
            boolean flag = userService.updatePwd(((User) object).getId(), newPwd);
            if(flag){
                req.setAttribute("message","修改密码成功，请重新登录");
                //密码修改成功，移除当前Session
                req.getSession().removeAttribute(Constants.USER_SESSION);
            }else {
                req.setAttribute("message","修改密码失败");
            }
        }else {
            req.setAttribute("message","新密码错误");
        }
        try {
            req.getRequestDispatcher("pwdmodify.jsp").forward(req,resp);
        } catch (ServletException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    //验证旧密码，从Session中获取
    public void pwdModify(HttpServletRequest req, HttpServletResponse resp){
        Object object = req.getSession().getAttribute(Constants.USER_SESSION);
        String oldPwd = req.getParameter("oldpassword");
        //万能的Map : 结果集
        HashMap<String,String> resultMap = new HashMap<>();

        if(object==null){   //Session失效、过期的处理
            resultMap.put("result","sessionerror");
        }else if(StringUtils.isNullOrEmpty(oldPwd)){    //输入的密码为空
            resultMap.put("result","error");
        }else{
            String userPwd = ((User)object).getUserPassword();
            if(oldPwd.equals(userPwd)){
                resultMap.put("result","true");
            }else {
                resultMap.put("result","false");
            }
        }
        resp.setContentType("application/json");
        try {
            PrintWriter writer = resp.getWriter();
            //JSONArray阿里巴巴的JSON工具类，转换格式
            writer.write(JSONArray.toJSONString(resultMap));
            writer.flush();
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

测试

8、用户管理实现

1、准备工作

功能框架：

导入分页的工具类

public class PageSupport {
    //当前页码，来自用户输入
    private int currentPageNo;
    //总数量(表)
    private int totalCount;
    //页面容量
    private int pageSize = 0;
    //总页数-totalCount/pageSize(+1)
    private int totalPageCount = 1;

    public int getCurrentPageNo() {
        return currentPageNo;
    }

    public void setCurrentPageNo(int currentPageNo) {
        if(currentPageNo > 0){
            this.currentPageNo = currentPageNo;
        }
    }

    public int getTotalCount() {
        return totalCount;
    }

    public void setTotalCount(int totalCount) {
        if(totalCount > 0){
            this.totalCount = totalCount;
            this.setTotalPageCountByRs();
        }
        this.totalCount = totalCount;
    }

    private void setTotalPageCountByRs() {
        if(this.totalCount % this.pageSize == 0){
            this.totalPageCount = this.totalCount / this.pageSize;
        }else if(this.totalCount % this.pageSize > 0){
            this.totalPageCount = this.totalCount / this.pageSize + 1;
        }else {
            this.totalPageCount = 0;
        }
    }

    public int getPageSize() {
        return pageSize;
    }

    public void setPageSize(int pageSize) {
        if(pageSize > 0){
            this.pageSize = pageSize;
        }
    }

    public int getTotalPageCount() {
        return totalPageCount;
    }

    public void setTotalPageCount(int totalPageCount) {
        this.totalPageCount = totalPageCount;
    }
}

用户列表前端页面导入

<%@ page language="java" contentType="text/html; charset=UTF-8"
   pageEncoding="UTF-8"%>
<%@include file="/jsp/common/head.jsp"%>
        <div class="right">
            <div class="location">
                <strong>你现在所在的位置是:</strong>
                <span>用户管理页面</span>
            </div>
            <div class="search">
                  <form method="get" action="${pageContext.request.contextPath }/jsp/user.do">
               <input name="method" value="query" class="input-text" type="hidden">
                <span>用户名：</span>
                <input name="queryname" class="input-text"    type="text" value="${queryUserName }">
                
                <span>用户角色：</span>
                <select name="queryUserRole">
                  <c:if test="${roleList != null }">
                     <option value="0">--请选择--</option>
                     <c:forEach var="role" items="${roleList}">
                            <option <c:if test="${role.id == queryUserRole }">selected="selected"</c:if>
                            value="${role.id}">${role.roleName}</option>
                     </c:forEach>
                  </c:if>
                 </select>
                
                <input type="hidden" name="pageIndex" value="1"/>
                <input    value="查 询" type="submit" id="searchbutton">
                <a href="${pageContext.request.contextPath}/jsp/useradd.jsp" >添加用户</a>
            </form>
            </div>
            <!--用户-->
            <table class="providerTable" cellpadding="0" cellspacing="0">
                <tr class="firstTr">
                    <th width="10%">用户编码</th>
                    <th width="20%">用户名称</th>
                    <th width="10%">性别</th>
                    <th width="10%">年龄</th>
                    <th width="10%">电话</th>
                    <th width="10%">用户角色</th>
                    <th width="30%">操作</th>
                </tr>
                   <c:forEach var="user" items="${userList }" varStatus="status">
               <tr>
                  <td>
                  <span>${user.userCode }</span>
                  </td>
                  <td>
                  <span>${user.userName }</span>
                  </td>
                  <td>
                     <span>
                        <c:if test="${user.gender==1}">男</c:if>
                        <c:if test="${user.gender==2}">女</c:if>
                     </span>
                  </td>
                  <td>
                  <span>${user.age}</span>
                  </td>
                  <td>
                  <span>${user.phone}</span>
                  </td>
                  <td>
                     <span>${user.userRoleName}</span>
                  </td>
                  <td>
                  <span><a class="viewUser" href="javascript:;" userid=${user.id } username=${user.userName }><img src="${pageContext.request.contextPath }/images/read.png" alt="查看" title="查看"/></a></span>
                  <span><a class="modifyUser" href="javascript:;" userid=${user.id } username=${user.userName }><img src="${pageContext.request.contextPath }/images/xiugai.png" alt="修改" title="修改"/></a></span>
                  <span><a class="deleteUser" href="javascript:;" userid=${user.id } username=${user.userName }><img src="${pageContext.request.contextPath }/images/schu.png" alt="删除" title="删除"/></a></span>
                  </td>
               </tr>
            </c:forEach>
         </table>
         <input type="hidden" id="totalPageCount" value="${totalPageCount}"/>
         <c:import url="rollpage.jsp">
              <c:param name="totalCount" value="${totalCount}"/>
              <c:param name="currentPageNo" value="${currentPageNo}"/>
              <c:param name="totalPageCount" value="${totalPageCount}"/>
           </c:import>
        </div>
    </section>

<!--点击删除按钮后弹出的页面-->
<div class="zhezhao"></div>
<div class="remove" id="removeUse">
    <div class="removerChid">
        <h2>提示</h2>
        <div class="removeMain">
            <p>你确定要删除该用户吗？</p>
            <a href="#" id="yes">确定</a>
            <a href="#" id="no">取消</a>
        </div>
    </div>
</div>

<%@include file="/jsp/common/foot.jsp" %>
<script type="text/javascript" src="${pageContext.request.contextPath }/js/userlist.js"></script>

2、获取用户数量

UserDao

1 2	//查询用户总数 public int getUserTotal(Connection connection,String username,int userRole) throws SQLException;

UserDaoImpl

//根据用户名或者角色，查询用户总数
@Override
public int getUserTotal(Connection connection,String username,int userRole) throws SQLException {
    PreparedStatement pstm = null;
    ResultSet rs = null;
    int count = 0;
    if(connection != null){
        StringBuffer sql = new StringBuffer();
        sql.append("select count(1) as count from smbms_user u,smbms_role r where u.userRole = r.id");
        ArrayList<Object> list = new ArrayList<>();//存放参数

        if(!StringUtils.isNullOrEmpty(username)){
            sql.append(" and u.userName like ?");
            list.add("%"+username+"%");
        }
        if(userRole > 0){
            sql.append(" and u.userRole = ?");
            list.add(userRole);
        }
        //将list转成数组
        Object[] params = list.toArray();
        System.out.println("UserDaoImpl->getUserTotal:"+sql.toString());//输出完整的sql语句
        rs = BaseDao.execute(connection, pstm, rs, sql.toString(), params);
        if(rs.next()){
            count = rs.getInt("count");//从结果集中获取最终的数量
        }
        BaseDao.closeResource(connection,pstm,rs);

    }
    return count;
}

UserService

1 2	//获取用户数量 public int getUserTotal(String username,int userRole);

UserServiceImpl

//查询记录总数
@Override
public int getUserTotal(String username, int userRole) {
    Connection conn = null;
    int count = 0;
    try{
        conn = BaseDao.getConn();
        count = userDao.getUserTotal(conn, username, userRole);
    } catch (SQLException e) {
        e.printStackTrace();
    }finally {
        BaseDao.closeResource(conn,null,null);
    }
    return count;
}

3、获取用户列表

UserDao

1 2	//通过条件查询userlist public List<User> getUserList(Connection connection,String username,int userRole,int currentPageNo,int pageSize) throws SQLException;

UserDaoImpl

@Override
public List<User> getUserList(Connection connection, String username, int userRole, int currentPageNo, int pageSize) throws SQLException {
    PreparedStatement pstm = null;
    ResultSet rs = null;
    List<User> userList = new ArrayList<>();
    if(connection != null){
        StringBuffer sql = new StringBuffer();
        sql.append("select u.*,r.roleName as userRoleName from smbms_user u,smbms_role r where u.userRole = r.id");
        ArrayList<Object> list = new ArrayList<>();//存放参数

        if(!StringUtils.isNullOrEmpty(username)){
            sql.append(" and u.userName like ?");
            list.add("%"+username+"%");
        }
        if(userRole > 0){
            sql.append(" and u.userRole = ?");
            list.add(userRole);
        }
        //在数据库中，分页使用limit startIndex, pageSize
        sql.append(" order by creationDate DESC limit ?,?");
        currentPageNo = (currentPageNo - 1)*pageSize;
        list.add(currentPageNo);
        list.add(pageSize);

        //将list转成数组
        Object[] params = list.toArray();
        System.out.println("sql---->"+sql.toString());//输出完整的sql语句
        rs = BaseDao.execute(connection, pstm, rs, sql.toString(), params);
        if(rs.next()){
            User user = new User();
            user = new User();
            user.setId(rs.getInt("id"));
            user.setUserCode(rs.getString("userCode"));
            user.setUserName(rs.getString("userName"));
            user.setGender(rs.getInt("gender"));
            user.setBirthday(rs.getDate("birthday"));
            user.setPhone(rs.getString("phone"));
            user.setUserRole(rs.getInt("userRole"));
            user.setUserRoleName(rs.getString("userRoleName"));
            userList.add(user);
        }
        BaseDao.closeResource(connection,pstm,rs);
    }
    return userList;
}

UserService

1 2	/根据条件查询用户列表 public List<User> getUserlist(String queryUserName,int queryUserRole,int currentPageNo,int pageSize);

UserServiceImpl

@Override
public List<User> getUserlist(String queryUserName, int queryUserRole, int currentPageNo, int pageSize) {
    Connection conn = null;
    List<User> userList = null;
    try{
        conn = BaseDao.getConn();
        userList = userDao.getUserList(conn, queryUserName, queryUserRole,currentPageNo,pageSize);
    } catch (SQLException e) {
        e.printStackTrace();
    }finally {
        BaseDao.closeResource(conn,null,null);
    }
    return userList;
}

测试

4、获取角色列表

为了职责统一，将角色的操作单独放在一个包中，与pojo中的类对应

RoleDao

1 2	//获取角色列表 public List<Role> getRoleList(Connection connection) throws SQLException;

RoleDaoImpl

//获取角色列表
@Override
public List<Role> getRoleList(Connection connection) throws SQLException {
    PreparedStatement pstm = null;
    ResultSet rs = null;
    List<Role> roleList = new ArrayList<>();
    if (connection != null) {
        String sql = "select * from smbms_role";
        Object[] params = {};
        rs = BaseDao.execute(connection, pstm, rs, sql, params);
        while (rs.next()) {
            Role role = new Role();
            role.setId(rs.getInt("id"));
            role.setRoleName(rs.getString("roleName"));
            role.setRoleCode(rs.getString("roleCode"));
            roleList.add(role);
        }
        BaseDao.closeResource(null, pstm, rs);
    }
    return roleList;
}

RoleService

1 2	//获取角色列表 public List<Role> getRoleList();

RoleServiceImpl

public class RoleServiceImpl implements RoleService {
    //引入Dao
    private RoleDao roleDao;
    public RoleServiceImpl() {
        roleDao = new RoleDaoImpl();
    }

    public List<Role> getRoleList() {
        Connection connection = null;
        List<Role> roleList = null;
        try {
            connection = BaseDao.getConn();
            roleList = roleDao.getRoleList(connection);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            BaseDao.closeResource(connection,null,null);
        }
        return roleList;
    }
}

5、用户显示的Servlet

获取用户前端的数据（查询）
判断请求是否需要执行，根据参数的值判断
为了实现分页，需要计算出当前页面和总页面、页面大小…
用户列表展示
返回前端

public void query(HttpServletRequest req, HttpServletResponse resp) {
    //查询用户列表，从前端获取数据
    String queryUserName = req.getParameter("queryname");
    String temp = req.getParameter("queryUserRole");
    String pageIndex = req.getParameter("pageIndex");
    int queryUserRole = 0;
    //获取用户列表
    UserService userService = new UserServiceImpl();
    List<User> userList = null;

    //设定每页记录数量、当前页号
    int pageSize = 5;   //可以考虑放入配置文件里
    int currentPageNo = 1;

    if (queryUserName == null) {
        queryUserName = "";
    }
    if (temp != null && !temp.equals("")) {
        queryUserRole = Integer.parseInt(temp); //给查询赋值
    }
    if (pageIndex != null) {
        try {
            currentPageNo = Integer.parseInt(pageIndex);
        } catch (NumberFormatException e) {
            e.printStackTrace();
            try {
                resp.sendRedirect("error.jsp");
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }
    //获取用户总数
    int totalCount = userService.getUserTotal(queryUserName, queryUserRole);

    //总页数支持
    PageSupport pageSupport = new PageSupport();
    pageSupport.setCurrentPageNo(currentPageNo);
    pageSupport.setPageSize(pageSize);
    pageSupport.setTotalCount(totalCount);
    int totalPageCount = pageSupport.getTotalPageCount();
    //控制首尾页
    if (currentPageNo < 1) {
        currentPageNo = 1;
    } else if (currentPageNo > totalPageCount) {
        currentPageNo = totalPageCount;
    }
    //获取用户列表展示
    userList = userService.getUserlist(queryUserName,queryUserRole,currentPageNo,pageSize);
    req.setAttribute("userList",userList);

    RoleService roleService = new RoleServiceImpl();
    List<Role> roleList = roleService.getRoleList();
    req.setAttribute("roleList",roleList);
    req.setAttribute("totalCount",totalCount);
    req.setAttribute("currentPageNo",currentPageNo);
    req.setAttribute("totalPageCount",totalPageCount);
    req.setAttribute("queryUserName",queryUserName);
    req.setAttribute("queryUserRole",queryUserRole);
    //返回前端
    try {
        req.getRequestDispatcher("userlist.jsp").forward(req,resp);
    } catch (ServletException | IOException e) {
        e.printStackTrace();
    }
}

9、订单管理

和用户管理实现过程几乎完全相同，此处略

10、供应商管理

和用户管理实现过程几乎完全相同，此处略

11、界面展示

登录界面

主界面

用户管理界面

密码修改界面