SMBMS超市订单管理系统

1. 项目功能结构

2. 数据库

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. MAVEN WEB项目搭建

• 干净pom.xml,修改web.xml,标注Java和resources
• 配置tomcat
• 导入jar包

<dependencies>
  <dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>servlet-api</artifactId>
    <version>2.5</version>
  </dependency>
  <dependency>
    <groupId>javax.servlet.jsp</groupId>
    <artifactId>jsp-api</artifactId>
    <version>2.2</version>
  </dependency>
  <dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.25</version>
  </dependency>
  <dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
  </dependency>
  <dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.13</version>
  </dependency>
  <dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>2.0.19</version>
  </dependency>
</dependencies>

• 创建项目包结构，编写实体类
  
  
• 编写基础公共类
• resources下创建db.properties

driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/smbms?useSSL=true&useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC
username=root
password=root

• dao->BaseDao

package com.gy.dao;

import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;

/**
 * 操作数据库的公共类
 *
 * @author Ray
 * @create 2022-11-19 17:36
 */
public class BaseDao {
    private static String driver;
    private static String url;
    private static String username;
    private static String password;

    //类加载时就初始化
    static {
        Properties properties = new Properties();
        //通过类加载器读取对应的资源
        InputStream is = BaseDao.class.getClassLoader().getResourceAsStream("db.properties");
        try {
            properties.load(is);
        } catch (IOException e) {
            e.printStackTrace();
        }
        driver = properties.getProperty("driver");
        url = properties.getProperty("url");
        username = properties.getProperty("username");
        password = properties.getProperty("password");
    }

    //获取数据库的连接
    public static Connection getConnection() {
        Connection connection = null;
        try {
            Class.forName(driver);
            connection = DriverManager.getConnection(url, username, password);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return connection;
    }

    //查询公共类
    public static ResultSet execute(Connection connection,PreparedStatement preparedStatement, ResultSet resultSet,String sql,Object[] params ) throws SQLException {
        //预编译的sql,在后面直接执行就可以了
        preparedStatement = connection.prepareStatement(sql);
        for (int i = 0; i < params.length; i++) {
            //占位符从1开始，但sql的参数 数组从0开始
            preparedStatement.setObject(i + 1, params[i]);
        }
        resultSet = preparedStatement.executeQuery();
        return resultSet;
    }
    //编写增删改公共方法，int指的是修改的行数
    public static int execute(Connection connection,PreparedStatement preparedStatement,String sql,Object[] params ) throws SQLException {
        preparedStatement = connection.prepareStatement(sql);
        for (int i = 0; i < params.length; i++) {
            //占位符从1开始，但数组从0开始
            preparedStatement.setObject(i + 1, params[i]);
        }
        int updateRows = preparedStatement.executeUpdate();
        return updateRows;
    }
    //释放资源
    public static boolean closeResource(Connection connection, PreparedStatement preparedStatement,ResultSet resultSet) {
        boolean flag = true;
        if (resultSet != null) {
            try {
                resultSet.close();
                //GC回收
                resultSet = null;
            } catch (SQLException throwables) {
                throwables.printStackTrace();
                //如果出现错误
                flag = false;
            }
        }
        if (preparedStatement != null) {
            try {
                preparedStatement.close();
                //GC回收
                preparedStatement = null;
            } catch (SQLException throwables) {
                throwables.printStackTrace();
                flag = false;
            }
        }
        if (connection != null) {
            try {
                connection.close();
                //GC回收
                connection = null;
            } catch (SQLException throwables) {
                throwables.printStackTrace();
                flag = false;
            }
        }
    return flag;
    }

}

• 字符编码过滤器filter->CharacterEncodingFilter

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() {

    }
}

• 在web.xml中配置

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

• 导入静态资源
  
  登录功能实现
  
• web.xml中设置欢迎页面即首页

    <welcome-file-list>
        <welcome-file>login.jsp</welcome-file>
    </welcome-file-list>

• dao->user->UserDao.java&UserDaoImpl.java

//得到登陆的用户
    public User getLoginUser(Connection connection, String userCode) throws SQLException;
     @Override
    public User getLoginUser(Connection connection, String userCode) throws SQLException {
        //准备3个对象
        PreparedStatement pstm = null;
        ResultSet rs = null;
        User user = null;
        //判断连接是否成功
        if (connection != null) {
            String sql = "select * from smbms_user where userCode=?";
            Object[] params = {userCode};
            rs = BaseDao.execute(connection, pstm, rs, sql, params);
            //查出来封装到用户里并返回user
            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
  • service->user->UserService&UserServiceImpl

public class UserServiceImpl implements UserService {
    //业务层都会调用dao层，必须引用Dao层
    private UserDao userDao;

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

    @Override
    public User login(String userCode, String password) {
        //获取对象
        Connection connection = null;
        User user = null;
        try {
            connection = BaseDao.getConnection();
            //通过业务层调用对应的具体的数据库操作
            user = userDao.getLoginUser(connection, userCode);
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        } finally {
            BaseDao.closeResource(connection, null, null);
        }
        if (null != user) {
            if (!user.getUserPassword().equals(password)) {
                user = null;
            }
        }
        return user;
    }

• servlet->user->LoginServlet.java

//servlet:控制层，调业务层代码
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("LoginServlet--start...");
        //从前端获取用户名和密码，看login.jsp中的name
        String userCode = req.getParameter("userCode");
        String userPassword = req.getParameter("userPassword");
        //和数据库的密码对比，调用业务层,注意这里的类型
        UserService userService = new UserServiceImpl();
        User user = userService.login(userCode, userPassword);//这已经把登陆的人查出
        if (user!=null){//查有此人，可以登录
            //将用户信息放入session中
            req.getSession().setAttribute(Constants.USER_SESSION,user);
            //跳转到内部主页，查看frame.jsp，发现需要导入common里两个头尾jsp
            resp.sendRedirect("jsp/frame.jsp");
        }else{//查无此人，无法登录
            //转发回登陆页面，提示用户名或者密码错误,login。jsp里面有{error}与下行对应
            req.setAttribute("error","用户名或者密码错误");
            req.getRequestDispatcher("login.jsp").forward(req,resp);
        }

• util->Constants.java

public final static String USER_SESSION = "userSession";

注销功能
servlet->user->LogoutServlet.java

//移除用户的session
       req.getSession().removeAttribute(Constants.USER_SESSION);
       resp.sendRedirect(req.getContextPath()+"/login.jsp");//返回登录页面,重定向不会重，注销会重
   }

• filter->SysFilter

 @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException {
        //获取session
        HttpServletRequest request = (HttpServletRequest) req;
        //重定向
        HttpServletResponse response = (HttpServletResponse) resp;
        //过滤器从session中获取用户，
        User user = (User) request.getSession().getAttribute(Constants.USER_SESSION);
        if (user==null){//已经被移除或注销或未登录
            response.sendRedirect("../error.jsp");
        }else {
            chain.doFilter(req,resp);
        }
    }

    @Override
    public void destroy() {
    }

• 配Servlet

<!--    用户登录过滤器-->
    <filter>
        <filter-name>SysFilter</filter-name>
        <filter-class>com.gy.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，权限都要保证OK!

• head.jsp导入前端素材

<li><a href="${pageContext.request.contextPath }/jsp/pwdmodify.jsp">密码修改</a></li>

• 写代码，从底向上
  
• UserDao加入

//修改当前用户密码
public int updatePwd(Connection connection, int id, String password) throws SQLException;
@Override
    public int updatePwd(Connection connection, int id, String password) throws SQLException {
        PreparedStatement pstm = null;
        int execute = 0;
        //可能service没传，不安全 servlet-service-dao-数据库
        if (connection != null) {
            String sql = "update smbms_user set userPassword = ? where id = ?";
            Object params[] = {password, id};
            execute = BaseDao.execute(connection, pstm, sql, params);
            BaseDao.closeResource(null, pstm, null);
        }
        return execute;
    }

• UserService

//根据用户id修改密码
public boolean updatePwd(int id,String pwd);
//实现类
 Connection connection = null;
//没有成功
        boolean flag = false;
        //修改密码
        try {
            connection = BaseDao.getConnection();
            //修改密码成功
            if (userDao.updatePwd(connection, id, pwd) > 0) {
                flag = true;
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            BaseDao.closeResource(connection,null,null);
        }
        return flag;

• UserServlet

/**
 * 实现servlt复用，需要提取出方法
 * @author Ray
 * @create 2022-11-21 16:47
 */
public class UserServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //此处与pwdmodify.jsp相对应
        String method = req.getParameter("method");
        //method!=null应该放前面，不然为null的话直接空指针了，或者写成"savepwd".equals(method)
        if (method!=null&&method.equals("savepwd")){
            this.updatePwd(req, resp);
        }else if (method.equals("pwdmodify")&&method!=null){
            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里拿id,确定成功在强转为USER
        Object o = req.getSession().getAttribute(Constants.USER_SESSION);
        String newpassword = req.getParameter("newpassword");
        //System.out.println("UserServlet"+newpassword);
        boolean flag = false;
        if (o!=null && !StringUtils.isNullOrEmpty(newpassword)){
            UserService userService = new UserServiceImpl();
            flag = userService.updatePwd(((User) o).getId(), newpassword);
            if (flag){
                //新建变量message
                req.setAttribute("message","修改密码成功，请退出使用新密码登录");
                //修改密码成功,移除当前session
                req.getSession().removeAttribute(Constants.USER_SESSION);
            }else {
                req.setAttribute("message","修改密码lose");
            }
        }else {
            req.setAttribute("message","新密码有问题");
        }
        try {
            req.getRequestDispatcher("/jsp/pwdmodify.jsp").forward(req,resp);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

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

• web.xml加入默认session过期时间

<!--    默认Session过期时间,真实业务需求-->
    <session-config>
        <session-timeout>30</session-timeout>
    </session-config>

• 根据js中的ajax写UserServlet里的验证旧密码