smdms超市订单管理系统之登录功能

一、超市订单管理系统准备阶段

Supermarket order management system

创建数据库
数据库代码放置如下

点击查看数据库address代码

CREATE TABLE `smbms_address` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键',
  `contact` varchar(15) DEFAULT NULL COMMENT '联系人姓名',
  `addressDesc` varchar(50) DEFAULT NULL COMMENT '收货地址',
  `postCode` varchar(15) DEFAULT NULL COMMENT '邮编',
  `tel` int(20) DEFAULT NULL COMMENT '联系人电话',
  `createdBy` varchar(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 DEFAULT CHARSET=utf8;
INSERT INTO `smbms_address` 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);
INSERT INTO `smbms_address` VALUES (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);
INSERT INTO `smbms_address` VALUES (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);
INSERT INTO `smbms_address` VALUES (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);
INSERT INTO `smbms_address` VALUES (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);
INSERT INTO `smbms_address` VALUES (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);

点击查看数据库bill代码

CREATE TABLE `smbms_bill` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id',
  `billCode` varchar(30) DEFAULT NULL COMMENT '账单编码',
  `productName` varchar(20) DEFAULT NULL COMMENT '商品名称',
  `productDesc` varchar(50) DEFAULT NULL COMMENT '商品描述',
  `productUnit` varchar(60) 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 '总金额',
  `isPayment` int(10) DEFAULT NULL COMMENT '是否支付',
  `createdBy` bigint(20) DEFAULT NULL COMMENT '创建者',
  `creationDate` datetime DEFAULT NULL COMMENT '创建时间',
  `modifyBy` bigint(20) DEFAULT NULL COMMENT '更新者',
  `modifyDate` datetime DEFAULT NULL COMMENT '更新时间',
  `providerId` int(10) DEFAULT NULL COMMENT '提供者id',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `smbms_bill` 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);
INSERT INTO `smbms_bill` VALUES (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);
INSERT INTO `smbms_bill` VALUES (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);
INSERT INTO `smbms_bill` VALUES (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);
INSERT INTO `smbms_bill` VALUES (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);
INSERT INTO `smbms_bill` VALUES (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);
INSERT INTO `smbms_bill` VALUES (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);
INSERT INTO `smbms_bill` VALUES (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);
INSERT INTO `smbms_bill` VALUES (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);
INSERT INTO `smbms_bill` VALUES (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);
INSERT INTO `smbms_bill` VALUES (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);
INSERT INTO `smbms_bill` VALUES (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);
INSERT INTO `smbms_bill` VALUES (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);
INSERT INTO `smbms_bill` VALUES (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);
INSERT INTO `smbms_bill` VALUES (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);
INSERT INTO `smbms_bill` VALUES (17, 'BILL2016_017', '脉动', '饮料', '瓶', 1500.00, 4500.00, 2, 1, '2016-05-10 12:00:00', NULL, NULL, 2);
INSERT INTO `smbms_bill` VALUES (18, 'BILL2016_018', '哇哈哈', '饮料', '瓶', 2000.00, 4000.00, 2, 1, '2015-11-24 15:12:03', NULL, NULL, 2);

点击查看数据库provider代码

CREATE TABLE `smbms_provider` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id',
  `proCode` varchar(15) DEFAULT NULL COMMENT '供应商编码',
  `proName` varchar(15) DEFAULT NULL COMMENT '供应商名称',
  `proDesc` varchar(50) DEFAULT NULL COMMENT '供应商描述',
  `proContact` varchar(15) DEFAULT NULL COMMENT '供应商联系人',
  `proPhone` varchar(20) DEFAULT NULL COMMENT '供应商电话',
  `userAddress` varchar(30) DEFAULT NULL COMMENT '供应商地址',
  `userFax` varchar(20) DEFAULT NULL COMMENT '供应商传真',
  `createdBy` bigint(20) DEFAULT NULL COMMENT '创建者',
  `creationDate` datetime DEFAULT NULL COMMENT '创建时间',
  `modifyBy` bigint(20) DEFAULT NULL COMMENT '更新者',
  `modifyDate` datetime DEFAULT NULL COMMENT '更新时间',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `smbms_provider` 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);
INSERT INTO `smbms_provider` VALUES (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);
INSERT INTO `smbms_provider` VALUES (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);
INSERT INTO `smbms_provider` VALUES (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);
INSERT INTO `smbms_provider` VALUES (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);
INSERT INTO `smbms_provider` VALUES (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);
INSERT INTO `smbms_provider` VALUES (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);
INSERT INTO `smbms_provider` VALUES (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);
INSERT INTO `smbms_provider` VALUES (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);
INSERT INTO `smbms_provider` VALUES (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);
INSERT INTO `smbms_provider` VALUES (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);
INSERT INTO `smbms_provider` VALUES (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);
INSERT INTO `smbms_provider` VALUES (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);
INSERT INTO `smbms_provider` VALUES (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);
INSERT INTO `smbms_provider` VALUES (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);

点击查看数据库role代码

CREATE TABLE `smbms_role` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id',
  `roleCode` varchar(30) DEFAULT NULL COMMENT '角色编码',
  `roleName` varchar(15) 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 '更新者',
  `modifyDate` datetime DEFAULT NULL COMMENT '更新时间',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `smbms_role` VALUES (1, 'SMBMS_ADMIN', '系统管理员', 1, '2016-04-13 00:00:00', NULL, NULL);
INSERT INTO `smbms_role` VALUES (2, 'SMBMS_MANAGER', '经理', 1, '2016-04-13 00:00:00', NULL, NULL);
INSERT INTO `smbms_role` VALUES (3, 'SMBMS_EMPLOYEE', '普通员工', 1, '2016-04-13 00:00:00', NULL, NULL);

点击查看数据库user代码

CREATE TABLE `smbms_user` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id',
  `userCode` varchar(15) DEFAULT NULL COMMENT '用户编码',
  `userName` varchar(15) DEFAULT NULL COMMENT '用户名字',
  `userPassword` varchar(20) DEFAULT NULL COMMENT '用户密码',
  `gender` int(10) DEFAULT NULL COMMENT '性别',
  `birthday` date DEFAULT NULL COMMENT '出生日期',
  `phone` varchar(20) DEFAULT NULL COMMENT '电话',
  `address` varchar(30) DEFAULT NULL COMMENT '地址',
  `userRole` bigint(20) DEFAULT NULL COMMENT '用户角色',
  `createdBy` bigint(20) DEFAULT NULL COMMENT '创建者',
  `creationDate` datetime DEFAULT NULL COMMENT '创建时间',
  `modifyBy` bigint(20) DEFAULT NULL COMMENT '更新者',
  `modifyDate` datetime DEFAULT NULL COMMENT '更新时间',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `smbms_user` VALUES (1, 'admin', '111', '111111', 1, '2021-04-22', '13688889999', '北京市海淀区成府路207号', 3, 1, '2013-03-21 16:52:07', 1, '2021-04-22 17:43:02');
INSERT INTO `smbms_user` VALUES (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);
INSERT INTO `smbms_user` VALUES (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);
INSERT INTO `smbms_user` VALUES (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);
INSERT INTO `smbms_user` VALUES (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);
INSERT INTO `smbms_user` VALUES (8, 'zhaoyan', '赵燕', '0000000', 2, '2021-04-22', '18098764545', '北京市海淀区回龙观小区10号楼', 2, 1, '2016-04-21 13:54:07', 1, '2021-04-22 17:56:11');
INSERT INTO `smbms_user` VALUES (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);
INSERT INTO `smbms_user` VALUES (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);
INSERT INTO `smbms_user` VALUES (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');
INSERT INTO `smbms_user` VALUES (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);
INSERT INTO `smbms_user` VALUES (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);

当数据库配置完以后我们开始idea，创建一个Maven Webapp模板项目
然后开始配置Tomcat服务器
在pom.xml中导入项目依赖的jar包

点击查看代码

<dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
    <dependency><!-- servlet包 -->
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
    </dependency>
    <dependency><!-- jstl包 -->
      <groupId>javax.servlet.jsp.jstl</groupId>
      <artifactId>jstl-api</artifactId>
      <version>1.2</version>
    </dependency>
    <dependency><!-- jsp包 -->
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>javax.servlet.jsp-api</artifactId>
      <version>2.3.3</version>
    </dependency>
    <dependency><!-- 数据库包 -->
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.28</version>
    </dependency>
    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>1.1.2</version>
    </dependency>
  </dependencies>

二、进入idea开始编码

首先编写我们的实体类pojo，数据库表中的信息与之对应。

点击User类代码

package pojo;

import java.util.Date;

public class User {
    private Integer id; //id
    private String userCode; //用户编码
    private String userName; //用户名字
    private String userPassword; //用户密码
    private Integer gender; //性别
    private Date birthday; //出生日期
    private String phone; //手机号
    private String address; //地址
    private Integer userRole; //用户角色
    private Integer createBy; //创建者
    private Date creationDate; //创建时间
    private Integer modifyBy; //更新者
    private Date modifyDate; //更新时间

    private Integer age; //年龄
    private String userRoleName; //用户角色名字

    public Integer getAge() {
        Date date = new Date();
        Integer age = date.getYear() - birthday.getYear();
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getUserRoleName() {
        return userRoleName;
    }

    public void setUserRoleName(String userRoleName) {
        this.userRoleName = userRoleName;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUserCode() {
        return userCode;
    }

    public void setUserCode(String userCode) {
        this.userCode = userCode;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getUserPassword() {
        return userPassword;
    }

    public void setUserPassword(String userPassword) {
        this.userPassword = userPassword;
    }

    public Integer getGender() {
        return gender;
    }

    public void setGender(Integer gender) {
        this.gender = gender;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public Integer getUserRole() {
        return userRole;
    }

    public void setUserRole(Integer userRole) {
        this.userRole = userRole;
    }

    public Integer getCreateBy() {
        return createBy;
    }

    public void setCreateBy(Integer createBy) {
        this.createBy = createBy;
    }

    public Date getCreationDate() {
        return creationDate;
    }

    public void setCreationDate(Date creationDate) {
        this.creationDate = creationDate;
    }

    public Integer getModifyBy() {
        return modifyBy;
    }

    public void setModifyBy(Integer modifyBy) {
        this.modifyBy = modifyBy;
    }

    public Date getModifyDate() {
        return modifyDate;
    }

    public void setModifyDate(Date modifyDate) {
        this.modifyDate = modifyDate;
    }
}

点击Role类代码

package pojo;

import java.util.Date;

public class Role {
    private Integer id; //id
    private String roleCode; //角色编码
    private String roleName; //角色名字
    private Integer createdBy; //创建者
    private Date creationDate; //创建时间
    private Integer modifyBy; //更新者
    private Date modifyDate; //更新时间

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getRoleCode() {
        return roleCode;
    }

    public void setRoleCode(String roleCode) {
        this.roleCode = roleCode;
    }

    public String getRoleName() {
        return roleName;
    }

    public void setRoleName(String roleName) {
        this.roleName = roleName;
    }

    public Integer getCreatedBy() {
        return createdBy;
    }

    public void setCreatedBy(Integer createdBy) {
        this.createdBy = createdBy;
    }

    public Date getCreationDate() {
        return creationDate;
    }

    public void setCreationDate(Date creationDate) {
        this.creationDate = creationDate;
    }

    public Integer getModifyBy() {
        return modifyBy;
    }

    public void setModifyBy(Integer modifyBy) {
        this.modifyBy = modifyBy;
    }

    public Date getModifyDate() {
        return modifyDate;
    }

    public void setModifyDate(Date modifyDate) {
        this.modifyDate = modifyDate;
    }
}

点击Provider代码

package pojo;

import java.util.Date;

public class Provider {
    private Integer id; //id
    private String proCode; //供应商编码
    private String proName; //供应商名字
    private String proDesc; //供应商查询
    private String proContact; //供应商联系人
    private String proPhone; //供应商手机
    private String proAddress; //供应商地址
    private String proFax; //供应商传真
    private Integer createdBy; //创建者
    private Date creationDate; //创建时间
    private Integer modifyBy; //更新者
    private Date modifyDate; //更新时间

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getProCode() {
        return proCode;
    }

    public void setProCode(String proCode) {
        this.proCode = proCode;
    }

    public String getProName() {
        return proName;
    }

    public void setProName(String proName) {
        this.proName = proName;
    }

    public String getProDesc() {
        return proDesc;
    }

    public void setProDesc(String proDesc) {
        this.proDesc = proDesc;
    }

    public String getProContact() {
        return proContact;
    }

    public void setProContact(String proContact) {
        this.proContact = proContact;
    }

    public String getProPhone() {
        return proPhone;
    }

    public void setProPhone(String proPhone) {
        this.proPhone = proPhone;
    }

    public String getProAddress() {
        return proAddress;
    }

    public void setProAddress(String proAddress) {
        this.proAddress = proAddress;
    }

    public String getProFax() {
        return proFax;
    }

    public void setProFax(String proFax) {
        this.proFax = proFax;
    }

    public Integer getCreatedBy() {
        return createdBy;
    }

    public void setCreatedBy(Integer createdBy) {
        this.createdBy = createdBy;
    }

    public Date getCreationDate() {
        return creationDate;
    }

    public void setCreationDate(Date creationDate) {
        this.creationDate = creationDate;
    }

    public Integer getModifyBy() {
        return modifyBy;
    }

    public void setModifyBy(Integer modifyBy) {
        this.modifyBy = modifyBy;
    }

    public Date getModifyDate() {
        return modifyDate;
    }

    public void setModifyDate(Date modifyDate) {
        this.modifyDate = modifyDate;
    }
}

点击Bill代码

package pojo;

import java.math.BigDecimal;
import java.util.Date;

public class Bill {
    private int id; //id
    private String billCode; //账单编码
    private String productName; //商品名称
    private String productDesc; //商品描述
    private String productUnit; //商品单位
    private BigDecimal productCount; //商品数量
    private BigDecimal totalPrice; //总金额
    private Integer isPayment; //是否支付
    private Integer createdBy; //创建者
    private Date creationDate; //创建时间
    private Integer modifyBy; //更新者
    private Date modifyDate; //更新时间
    private Integer providerId; //供应商id

    private String providerName;//供应商名字

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getBillCode() {
        return billCode;
    }

    public void setBillCode(String billCode) {
        this.billCode = billCode;
    }

    public String getProductName() {
        return productName;
    }

    public void setProductName(String productName) {
        this.productName = productName;
    }

    public String getProductDesc() {
        return productDesc;
    }

    public void setProductDesc(String productDesc) {
        this.productDesc = productDesc;
    }

    public String getProductUnit() {
        return productUnit;
    }

    public void setProductUnit(String productUnit) {
        this.productUnit = productUnit;
    }

    public BigDecimal getProductCount() {
        return productCount;
    }

    public void setProductCount(BigDecimal productCount) {
        this.productCount = productCount;
    }

    public BigDecimal getTotalPrice() {
        return totalPrice;
    }

    public void setTotalPrice(BigDecimal totalPrice) {
        this.totalPrice = totalPrice;
    }

    public Integer getIsPayment() {
        return isPayment;
    }

    public void setIsPayment(Integer isPayment) {
        this.isPayment = isPayment;
    }

    public Integer getCreatedBy() {
        return createdBy;
    }

    public void setCreatedBy(Integer createdBy) {
        this.createdBy = createdBy;
    }

    public Date getCreationDate() {
        return creationDate;
    }

    public void setCreationDate(Date creationDate) {
        this.creationDate = creationDate;
    }

    public Integer getModifyBy() {
        return modifyBy;
    }

    public void setModifyBy(Integer modifyBy) {
        this.modifyBy = modifyBy;
    }

    public Date getModifyDate() {
        return modifyDate;
    }

    public void setModifyDate(Date modifyDate) {
        this.modifyDate = modifyDate;
    }

    public Integer getProviderId() {
        return providerId;
    }

    public void setProviderId(Integer providerId) {
        this.providerId = providerId;
    }

    public String getProviderName() {
        return providerName;
    }

    public void setProviderName(String providerName) {
        this.providerName = providerName;
    }
}

然后编写数据库连接用的文件

点击文件后缀为.properties

driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/数据库名字?useUnicode=true&characterEncoding=utf8
username=账号
password=密码

idea连接数据库（不在此展示，自行解决）
编写过滤器，使我们网页每次都用utf-8编码

点击过滤器代码

import javax.servlet.*;
import java.io.IOException;

public class Filter implements javax.servlet.Filter {
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
        chain.doFilter(request,response);
    }

    public void destroy() {

    }
}

编写数据库的公共类，实现增删改查SRUD功能

package com.meteor.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
public class BaseDao {
    private static final String driver;
    private static final String url;
    private static final String username;
    private static final String password;

    //静态代码块，随着类的加载而加载
    static{
        Properties properties = new Properties();//可以让文件内容以键值对的形式读取
        //将文件内容读出
        InputStream is = BaseDao.class.getClassLoader().getResourceAsStream("db.properties");
        try {
            //properties.load()从输入字节流读取属性列表（键和元素对）。
            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);//加载驱动
            //尝试建立与给定数据库URL的连接。
            connection = DriverManager.getConnection(url, username, password);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return connection;
    }

    //编写查询公共方法
    public static ResultSet execute(Connection connection,String sql,Object[] params,ResultSet resultSet,PreparedStatement preparedStatement) throws SQLException {
        //connection.prepareStatement(sql)创建一个 PreparedStatement对象，用于将参数化的SQL语句发送到数据库。
        preparedStatement = connection.prepareStatement(sql);
        for (int i = 0; i < params.length; i++) {
            preparedStatement.setObject(i+1,params[i]);//使用给定对象设置指定参数的值。
        }
        resultSet = preparedStatement.executeQuery();//返回查询结果
        return resultSet;
    }

    //编写增删改公共方法
    public static int execute(Connection connection,String sql,Object[] params,PreparedStatement preparedStatement) throws SQLException {
        //connection.prepareStatement(sql)创建一个 PreparedStatement对象，用于将参数化的SQL语句发送到数据库。
        preparedStatement = connection.prepareStatement(sql);
        for (int i = 0; i < params.length; i++) {
            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回收机制，如果对象为null，就会被回收。
                resultSet = null;
            } catch (SQLException e) {
                e.printStackTrace();
                flag = false;
            }
        }

        if(preparedStatement != null) {
            try {
                preparedStatement.close();
                //GC回收机制，如果对象为null，就会被回收。
                preparedStatement = null;
            } catch (SQLException e) {
                e.printStackTrace();
                flag = false;
            }
        }

        if(connection != null) {
            try {
                connection.close();
                //GC回收机制，如果对象为null，就会被回收。
                connection = null;
            } catch (SQLException e) {
                e.printStackTrace();
                flag = false;
            }
        }
        return flag;
    }
}

编写service服务层代码，验证登录是否正确

import dao.BaseDao;
import dao.user.UserDao;
import dao.user.UserDaoImpl;
import pojo.User;

import java.sql.Connection;

public class UserServiceImpl implements UserService{
    public User login(String userCode, String password) {
        UserDaoImpl userDao = new UserDaoImpl();
        Connection connection = BaseDao.getConnection();//连接数据库
        User user = userDao.getLoginUser(connection, userCode);//获得登录用户信息
        //对登录的用户账号密码进行判断
        if(user.getUserPassword() == null ? password == null : user.getUserPassword().equals(password)) {
            BaseDao.closeResource(connection,null,null);
            return user;
        }else {
            BaseDao.closeResource(connection,null,null);
            System.out.println("密码错误");
            return null;
        }
    }
}

7.编写servlet业务层代码，和前端交互

package com.meteor.servlet.user;

import com.meteor.pojo.User;
import com.meteor.service.user.UserService;
import com.meteor.service.user.UserServiceImpl;
import com.meteor.util.Constants;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class LoginServlet extends HttpServlet {

    //控制层调用业务层代码
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("别出bug");
        //获取前端输入的用户名和密码
        String userCode = req.getParameter("userCode");
        String userPassword = req.getParameter("userPassword");
        //和数据库的用户密码对比，调用业务层
        UserServiceImpl userService = new UserServiceImpl();
        User user = userService.login(userCode, userPassword);

        if(user != null) { //查有此人
            //将用户信息放到session中
            req.getSession().setAttribute(Constants.USER_SESSION,user);
            //登录成功，跳转到内部主页
            resp.sendRedirect("jsp/frame.jsp");
        }else {
            //查无此人，转回登录页面
            req.setAttribute("error","用户密码不正确");
            req.getRequestDispatcher("login.jsp").forward(req,resp);
        }
    }

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

工具类用来存放session值

点击查看代码


public class Constants {
    public static final String USER_SESSION = "userSession";
}

在web.xml设置servlet和filter过滤器


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

    <!-- 设置欢迎页面 -->
    <welcome-file-list>
        <welcome-file>login.jsp</welcome-file>
    </welcome-file-list>

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

三、总结

前端代码页面都是cpoy的，若想获取前端代码可私信我。
对于smdms登录内容就总结这么多，也是跟着狂神学的，代码也没怎么改进，只是想自己复习理解一遍。如果有不足之处，希望大家多多包涵，多多支持。如果有不懂的地方可以直接私信问我，欢迎来访！
我将会继续更新关于Java的学习知识，以及此项目的后续功能，感兴趣的小伙伴可以关注一下。
文章写得比较走心，用了很长时间，绝对不是copy过来的！
尊重每一位学习知识的人，同时也尊重每一位分享知识的人。

__EOF__

本文作者：Meteor-鑫
本文链接：https://www.cnblogs.com/lx-meteor/p/16097727.html
关于博主：评论和私信会在第一时间回复。或者直接私信我。
版权声明：本博客所有文章除特别声明外，均采用 BY-NC-SA 许可协议。转载请注明出处！
声援博主：如果您觉得文章对您有帮助，可以点击文章右下角【推荐】一下。您的鼓励是博主的最大动力！

相关阅读:
电子方案开发——智能跳绳方案
 电脑字体怎么改？4个方法快速更改字体！
springmvc集成ehcache
用Python获取网络数据
 软件测试报告模板(完整版)
完整的JVM详细介绍(全面)
《优化》
云原生系列三【轻松入门容器基础操作】
MapStruct_概念、如何使用、子集和映射、合并、Spring方式、表达式、自定义切面处理
 work环境配置
原文地址：https://www.cnblogs.com/lx-meteor/p/16097727.html