SMBMS 三层架构的简单案例（超市订单管理系统）

14.SSM框架 SMBMS

MVC三层架构

SMBMS基础登录演示

1.搭建一个mawen-web项目

2.测试Tomcat是否正常运行

配置最新的web.xml配置否则可能css样式不能呈现

3.导入对应的jar包

  <dependencies><dependency><!-- 单元测试  可能会产生test标签 删除即可--><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version></dependency><dependency><!-- Jsp依赖--><groupId>javax.servlet.jsp</groupId><artifactId>javax.servlet.jsp-api</artifactId><version>2.3.3</version><scope>provided</scope></dependency><!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api --><dependency><!-- Servlet依赖--><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>4.0.1</version><scope>provided</scope></dependency><!-- https://mvnrepository.com/artifact/taglibs/standard --><dependency><!-- Standard标签库--><groupId>taglibs</groupId><artifactId>standard</artifactId><version>1.1.2</version></dependency><!-- https://mvnrepository.com/artifact/javax.servlet.jsp.jstl/jstl-api --><dependency><!-- Jstl表达式依赖--><groupId>javax.servlet.jsp.jstl</groupId><artifactId>jstl-api</artifactId><version>1.2</version></dependency><dependency><!-- Java连接数据库--><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.47</version></dependency></dependencies>

4.编写实体类

Bill Provider Role User用户类对应Smbms数据库的表单表类映射

1.Bill

import java.math.BigDecimal;
import java.util.Date;public class Bill {private Integer id;private String billCode;//账单编码private String productName;//商品全名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 providerId;//供应商IDprivate Integer createdBy;//创建者private Date creationDate;//创建时间private Integer modifyDate;//更新时间private String providerName;//供应商名称public Integer getId() {return id;}public void setId(Integer 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 getProviderId() {return providerId;}public void setProviderId(Integer providerId) {this.providerId = providerId;}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 getModifyDate() {return modifyDate;}public void setModifyDate(Integer modifyDate) {this.modifyDate = modifyDate;}public String getProviderName() {return providerName;}public void setProviderName(String providerName) {this.providerName = providerName;}
}

2.Provide

import java.util.Date;public class Provider {private Integer id;// idprivate String proCode;//供应商编码private String proName;//供应商名字private String proDesc;//供应商描述private String proContact;//供应商联系人private String proPhone;//供应商电话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 getProAdress() {return proAddress;}public void setProAdress(String proAdress) {this.proAddress = proAdress;}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;}
}

3.Role

import java.util.Date;public class Role {private Integer id;//idprivate String roleCode;//角色编码private String roleName;//角色名称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;}
}

4.User

import java.util.Date;public class User {private Integer id; //idprivate String userCode; //用户编码private String username; //用户名称private String userPassword; //用户密码private Integer gender; //性别private Date birthday; //用户生日private String phone;//用户电话private String address;//用户地址private Integer userRole;//用户角色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 age;//用户年龄private String userRolename;  //用户角色名称public Integer getId(int id) {return this.id;}public void setId(Integer id) {this.id = id;}public String getUserCode(String userCode)  {return this.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 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 getAge() {Date date=new Date();Integer i = 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;}
}

5.数据库SMBMS

自己直接在数据库里面输入生成

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);

6.编写Properties Sql文件

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

7.编写Dao 操作数据库

1.类加载器读写Propert资源

2…连接数据库

3.编写查询公共类

4.编写增删改公共类

5.释放资源

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 String driver;private static String url;private static String username;private static String password;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");}
//获得数据库连接public static Connection getConnection(){Connection connection =null;try{Class.forName(driver);connection = DriverManager.getConnection(url,username,password);} catch (Exception e) {e.printStackTrace();}return connection;}//编写查询公共类public static ResultSet execute(Connection connection,PreparedStatement preparedStatement, ResultSet resultSet,String sql ,Object[] params) throws SQLException {preparedStatement = connection.prepareStatement(sql);for (int i=0;i<params.length;i++){//setObject  占位符是从1开始 我们是0preparedStatement.setObject(i+1,params[i]);}resultSet=preparedStatement.executeQuery();return  resultSet;}//编写增删改公共类public static int execute(Connection connection,  PreparedStatement preparedStatement,String sql , Object[] params) throws SQLException {//预编译preparedStatement = connection.prepareStatement(sql);//赋值操作for (int i=0;i<params.length;i++){//setObject 占位符是从1开始 我们是0preparedStatement.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 e) {e.printStackTrace();flag=false;}}if(preparedStatement!=null){try{preparedStatement.close();//GC回收preparedStatement=null;} catch (SQLException e) {e.printStackTrace();flag=false;}}if(connection!=null){try{connection.close();//GC回收connection=null;} catch (SQLException e) {e.printStackTrace();flag=false;}}return  flag;}}

7.编写Filter过滤

中文编码Filter

import javax.servlet.*;
import java.io.IOException;public class CharacterEncodingFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {servletRequest.setCharacterEncoding("utf-8");servletResponse.setCharacterEncoding("utf-8");filterChain.doFilter(servletRequest,servletResponse);}@Overridepublic void destroy() {}
}

xml

<!-- 字符过滤器   --><filter><filter-name>CharacterEncodingFilter</filter-name><filter-class>com.ws.filter.CharacterEncodingFilter</filter-class></filter><filter-mapping><filter-name>CharacterEncodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping>

8.导入静态资源 Jsp和Css

1.直接导入到web下面这里提供了jsp和css 不用自己写代码

**这里注意的是Css格式可能不会出来可能是因为Xml不是最新配置 **

2.设置首登录页面

  <!-- 设置登录页面为主页面   --><welcome-file-list><welcome-file>login.jsp</welcome-file></welcome-file-list>
</web-app>

9.Dao接口对应,实现类

1.获得数据库连接和用户信息的接口

import com.ws.pojo.User;import java.sql.Connection;
import java.sql.SQLException;//面向接口编程
public interface UserDao {//得到登录的用户  需要数据库连接对象  UserCode值public User getLoginUser(Connection connection,String userCode) throws SQLException;}

2.Dao接口实现类

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;public class UserDaoImpl implements UserDao{//public User getLoginUser(Connection connection, String userCode) throws SQLException {PreparedStatement pstm=null;ResultSet rs=null;User user=null;if(connection!=null) {//通过这个名字查询到这个sqlString sql = "select* from smbms_user where userCode=?";Object[] params = {userCode};//预编译查询操作rs = BaseDao.execute(connection,pstm, rs, sql, params);if(rs.next()){//封装到用户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.getDate("modifyDate"));}BaseDao.closeResource(null,pstm,rs);}return user;}
}

10.用户登录接口实现类

1.登录接口

userCode 和UserPassword 看看是否对应数据库和接口

import com.ws.pojo.User;public interface UserService {//用户登录public User login(String userCode,String userPassword);
}

2.实现类

**可以用Test注释进行测试操作可以排除很多错误 **

空指针错误 sql对应失败数据库看看Properties的资源有没有写错数据库连接有没有失败等还有数据库表对应都是易错点

import com.ws.dao.BaseDao;
import com.ws.dao.user.UserDao;
import com.ws.dao.user.UserDaoImpl;
import com.ws.pojo.User;
import org.junit.Test;import java.sql.Connection;
import java.sql.SQLException;public class UserServiceImpl implements UserService{//业务层需要调用Dao层  所以我们要引入Dao层private UserDao userDao;public UserServiceImpl(){userDao=new UserDaoImpl();}public User login(String userCode, String userPassword) {Connection connection=null;User user=null;try {//调用连接数据库connection= BaseDao.getConnection();//业务层调用对应具体的数据库操作user = userDao.getLoginUser(connection, userCode);} catch (SQLException e) {e.printStackTrace();}finally {//调用关闭类BaseDao.closeResource(connection,null,null);}return user;}
//    @Test
//    public  void test(){//
//        UserServiceImpl userService = new UserServiceImpl();
//        User admin = userService.login("admin", "1234567");
//        System.out.println(admin.getUserPassword());
//
//    }}

11.用户登录Servlet

一定看清楚你的数据库的用户id和密码id是什么对应关系才是最重要的否则也是会爆出空指针异常

import com.ws.pojo.User;
import com.ws.service.user.UserServiceImpl;
import com.ws.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 LoginServet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {//控制层 调用业务层代码System.out.println("LoginServlet--Start");//获得用户名和密码String userCode = req.getParameter("userCode");String userPassword = req.getParameter("userPassword");//和数据库中的对比UserServiceImpl userService = new UserServiceImpl();User user = userService.login(userCode, userPassword);if(user!=null){//不为空 可以登录req.getSession().setAttribute(Constants.USER_SESSION,user);//跳转resp.sendRedirect("jsp/frame.jsp");}else {//转发回去 提示密码或者用户名错误req.setAttribute("error","用户名或者密码错误");req.getRequestDispatcher("login.jsp").forward(req,resp);}}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doGet(req, resp);}
}

配置Xml

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

12.登录注销完善

移除用户的Session记录

mport com.ws.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 LogoutServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {//移除用户的Sessionreq.getSession().removeAttribute(Constants.USER_SESSION);resp.sendRedirect(req.getContextPath()+"/login.jsp");}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doGet(req, resp);}
}

配置xml

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

13.过滤登录进入页面

import com.ws.pojo.User;
import com.ws.util.Constants;import javax.servlet.*;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;import static com.ws.util.Constants.USER_SESSION;public class SysFilter implements Filter{@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {HttpServletRequest req = (HttpServletRequest) servletRequest;HttpServletResponse response = (HttpServletResponse) servletResponse;//从Session获得用户User user = (User) req.getSession().getAttribute(USER_SESSION);if(user==null){response.sendRedirect("/error.jsp");}filterChain.doFilter(servletRequest,servletResponse);}@Overridepublic void destroy() {}
}

配置xml

进入jsp文件的页面都过滤无法直接跳过登录直接进入

  <filter><filter-name>SysFilter</filter-name><filter-class>com.ws.filter.SysFilter</filter-class></filter><filter-mapping><filter-name>SysFilter</filter-name><url-pattern>/jsp/*</url-pattern></filter-mapping>

14.修改登录密码

UserDao层

 public int updatePwd(Connection connection,int id,String password) throws SQLException;

继承接口

 //修改用户密码public int updatePwd(Connection connection,int id,String password) throws SQLException {PreparedStatement pstm = null;int execute = 0;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;}

业务层

   //根据用户修改密码public boolean updatePwd(int id, String pwd);

继承接口

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

UserServlert 层

import com.mysql.jdbc.StringUtils;
import com.ws.pojo.User;
import com.ws.service.user.UserService;
import com.ws.service.user.UserServiceImpl;
import com.ws.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 UserServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {//从Session拿到IdObject o = req.getSession().getAttribute(Constants.USER_SESSION);String newpassword = req.getParameter("newpassword");boolean flag=false;if(o!=null&&!StringUtils.isNullOrEmpty(newpassword)){UserServiceImpl userService = new UserServiceImpl();//判断flag为真flag=userService.updatePwd(((User)o).getId(),newpassword);if(flag){req.setAttribute("message","密码修改正确");//修改成功，移除当前Sessionreq.getSession().removeAttribute(Constants.USER_SESSION);resp.sendRedirect(req.getContextPath()+"/login.jsp");}else {req.setAttribute("message","密码错误");}}else {req.getRequestDispatcher("/jsp/pwdmodify.jsp").forward(req,resp);}}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doGet(req, resp);}
}

配置Xml ** userServlet对应jsp里面的user.do响应**

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

通过jsp输入获得的数值传输到UserServlet层，然后调用业务层的对比用户信息和Dao层的数据库连接和修改数据，js进行对比，最后提交更新。

15.Servlet复用

在修改密码的阶段和验证旧密码适用

1.将UserServlet的doGet方法中的代码修改成

    String method=req.getParameter("method");if(method.equals("savepwd")&&method!=null){this.updatePwd(req,resp);}else if(method.equals("pwdmodify")&&method!=null){this.pwdModify(req,resp);}

2.创建一个新的修改密码类

 //修改密码public void updatePwd(HttpServletRequest req, HttpServletResponse resp) throws IOException {//从Session拿到IdObject o = req.getSession().getAttribute(Constants.USER_SESSION);String newpassword = req.getParameter("newpassword");boolean flag=false;if(o!=null&&!StringUtils.isNullOrEmpty(newpassword)){UserServiceImpl userService = new UserServiceImpl();//判断flag为真flag=userService.updatePwd(((User)o).getId(),newpassword);if(flag){req.setAttribute("message","密码修改正确");//修改成功，移除当前Sessionreq.getSession().removeAttribute(Constants.USER_SESSION);resp.sendRedirect(req.getContextPath()+"/login.jsp");}else {req.setAttribute("message","密码错误");}}else {try {req.getRequestDispatcher("/jsp/pwdmodify.jsp").forward(req,resp);} catch (ServletException e) {e.printStackTrace();}}}

16.验证旧密码

** 通过用户登录的Session 进行旧密码的验证**

//验证旧密码  Session中的密码public void pwdModify(HttpServletRequest req, HttpServletResponse resp){//获取SessionObject o = req.getSession().getAttribute(Constants.USER_SESSION);//获取输入的旧密码String oldpassword = req.getParameter("oldpassword");//万能的Map:结果集Map<String, String> resultMap = new HashMap<String,String>();if(o==null){//Session失效了//返回 jsp页面Session失效，需要重新登录输入密码resultMap.put("result","sessionerror");}else if(StringUtils.isNullOrEmpty(oldpassword)){//输入的密码为空resultMap.put("result","error");}else {//对比输入的密码和旧密码String userPassword = ((User) o).getUserPassword();if(oldpassword.equals(userPassword)){//相同的话返回trueresultMap.put("result","true");}else {//不一样返回errorresultMap.put("result","false");}}try {将json转变成resp.setContentType("application/json");PrintWriter writer = resp.getWriter();writer.write(JSONArray.toJSONString(resultMap));writer.flush();writer.close();} catch (IOException e) {e.printStackTrace();}}

设置Session的失效时间

 <!-- 默认Session过期时间  30分钟  过期时间：真实业务 --><session-config><session-timeout>30</session-timeout></session-config></web-app>

导入ajax.js(需要重新学习Css和js)

17.用户管理

1.获取用户数量

UserDao

//查询用户数量  根据用户名或者角色查询public int getUserCount(Connection connection,String username ,int userRole) throws SQLException;

UserDaoImpl

  @Overridepublic int getUserCount(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<Object>();//存放参数if(!StringUtils.isNullOrEmpty(username)){sql.append(" and u.userName like ?");list.add("%"+username+"%");//index 0}if(userRole>0){sql.append(" and u.userRole=?");list.add(userRole);//index 1}//怎么把list转换成数组Object[] params = list.toArray();System.out.println("USerDaoImpl->getUserCount"+sql.toString());//输出sqlrs = BaseDao.execute(connection,pstm,rs,sql.toString(),params);if(rs.next()){count = rs.getInt("count");//从结果集中获取最终数量}BaseDao.closeResource(null,pstm,rs);}return count;}

UserService

    //获取用户的数量public int getUserCount(String username,int userRole);

UserServiceImpl

  //查询记录数量@Overridepublic int getUserCount(String username, int userRole) {Connection connection=null;int count=0;try {connection = BaseDao.getConnection();//获得数量count=userDao.getUserCount(connection,username,userRole);//返回前端} catch (SQLException e) {e.printStackTrace();}finally {BaseDao.closeResource(connection,null,null);}return  count;}@Testpublic  void test(){UserServiceImpl userService = new UserServiceImpl();int userCount = userService.getUserCount(null, 0);System.out.println(userCount);}

2.获取用户列表

userDao

 //用过用户查询获取用户列表public List<User> getUserList(Connection connection,String userName ,int userRole,int currentPageNo,int pageSize )throws SQLException;

userDaoImpl

 //查询分页表单和分页数量管理@Overridepublic List<User> getUserList(Connection connection, String userName, int userRole, int currentPageNo, int pageSize)throws SQLException {PreparedStatement pstm=null;ResultSet rs=null;ArrayList<User> userList = new ArrayList<User>();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<Object>();//存放参数if(!StringUtils.isNullOrEmpty(userName)){sql.append(" and u.userName like ?");list.add("%"+userName+"%");//index 0}if(userRole>0){sql.append(" and u.userRole=?");list.add(userRole);//index 1}//分页//在数据库中使用 limit startIndex,pageSize; 总数//当前页 (当前页面-1)*页面大小//0，5         1 0  01234//5，10        2 5  56789//10，5        3 10sql.append("order by createionDate DESC limit ?,?");currentPageNo=(currentPageNo-1)*pageSize;list.add(currentPageNo);list.add(pageSize);Object[] params = list.toArray();System.out.println("sql------->"+sql.toString());rs = BaseDao.execute(connection, pstm, rs,sql.toString(), params);while (rs.next()){//封装到用户User _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.setUserRolename(rs.getString("userRoleName"));userList.add(_user);}BaseDao.closeResource(null,pstm,rs);}return userList;}

userService

  //分页查询表单和分页管理   //根据条件查询用户列表public List<User> getUserList(String queryUserName,int queryUserRole ,int currentPageNo,int pageSize);

userServiceImpl

 @Overridepublic List<User> getUserList(String queryUserName, int queryUserRole, int currentPageNo, int pageSize) {Connection connection=null;List<User> userList =null;System.out.println("queryUserName----->"+queryUserName);System.out.println("queryUserRole----->"+queryUserRole);System.out.println("currentPage----->"+currentPageNo);System.out.println("pageSize----->"+pageSize);try{connection=BaseDao.getConnection();//调用获取表单userList = userDao.getUserList(connection, queryUserName, queryUserRole, currentPageNo, pageSize);} catch (SQLException e) {e.printStackTrace();}finally {BaseDao.closeResource(connection,null,null);}return  userList;}

18.获得角色列表

为了方便管理把Role分了一个单独的组别

RoleDao

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

RoleDaoImpl

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

RoleService

public List<Role> getRoleList();

RoleServiceImpl

//引入Dao
private RoleDao roleDao;
public RoleServiceImpl() {roleDao = new RoleDaoImpl();
}@Override
public List<Role> getRoleList() {Connection connection=null;List<Role> roleList=null;connection= BaseDao.getConnection();try {roleList = roleDao.getRoleList(connection);} catch (SQLException e) {e.printStackTrace();}finally {BaseDao.closeResource(connection,null,null);}return roleList;
}

创建Servlet

分页计算总页计算

//重点//querypublic void query(HttpServletRequest req, HttpServletResponse resp){//查询用户列表String queryUserName = req.getParameter("queryName");String temp = req.getParameter("queryUserRole");String pageIndex = req.getParameter("pageIndex");int queryUserRole =0;//获取用户列表UserServiceImpl userService = new UserServiceImpl();List<User> userList =null;//第一次走这个请求一定是第一页 页面大小固定int pageSize=   5;int currentPageNo=1;if(queryUserName==null){queryUserName="";}if(temp!=null && !temp.equals("")){queryUserRole=Integer.parseInt(temp);//给查询赋值}if(pageIndex!=null){currentPageNo = Integer.parseInt(pageIndex);}//获得总数(分页  )int totalCount = userService.getUserCount(queryUserName, queryUserRole);//总页数支持PageSupport pageSupport = new PageSupport();pageSupport.setCurrentPageNo(currentPageNo);pageSupport.setPageSize(pageSize);pageSupport.setTotalPageCount(totalCount);int totalPageCount = ((int)(totalCount/pageSize))+1;  //总共的页数//控制首页尾页//如果页面小于1  就显示第一页的东西if(currentPageNo<1){currentPageNo=1;}else if(currentPageNo>totalPageCount){//当页面大于最后一页currentPageNo=totalPageCount;}//获取用户列表userList = userService.getUserList(queryUserName, queryUserRole, currentPageNo, pageSize);req.setAttribute("userList",userList);//角色列表   输入信息给前端RoleServiceImpl 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 e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}

19.来源

1.狂神视频学习
2.如果错误请指出改正
3.本人刚刚入门有些知识不是很专业望理解