本篇文章为你整理了SMBMS(超市订单管理系统)项目从零开始搭建（）的详细内容，包含有 SMBMS(超市订单管理系统)项目从零开始搭建，希望能帮助你了解 SMBMS(超市订单管理系统)项目从零开始搭建。
maven的详细创建，及配置请看这篇文章
https:///twq46/p/16508029.html
二、配置Tomcat
Tomcat相关配置详情请看我的这篇文章，关于Tomcat的配置及遇到的问题和解决方法都在文章里
https:///twq46/p/16508029.html
三、测试项目是否能够跑起来
四、导入项目中会遇到的jar包
比如jsp,Servlet,mysql,jstl,standar.....
!-- servlet的依赖--
dependency
groupId javax.servlet /groupId
artifactId javax.servlet-api /artifactId
version 3.1.0 /version
/dependency
!--JSP的依赖--
dependency
groupId javax.servlet.jsp /groupId
artifactId javax.servlet.jsp-api /artifactId
version 2.3.3 /version
/dependency
!--standard标签库--
dependency
groupId taglibs /groupId
artifactId standard /artifactId
version 1.1.2 /version
/dependency
!--JSTL表达式的依赖--
dependency
groupId javax.servlet.jsp.jstl /groupId
artifactId jstl /artifactId
version 1.2 /version
/dependency
!--连接数据库--
dependency
groupId mysql /groupId
artifactId mysql-connector-java /artifactId
version 8.0.28 /version
/dependency
五、创建项目包结构
六、编写实体(pojo)类
以下四个实体类必须与数据库中表的字段一一对应
1.User表的实体类
package com.tang.pojo;
import java.util.Date;
public class User {
private Integer id; //id
private String userCode; //用户编码
private String userName; //用户名称
private String userPassword; //用户密码
private Integer gender; //性别
private Date birthday; //出生日期
private String phone; //电话
private String address; //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;//年龄
private String userRoleName; //用户角色名称
public Integer getAge() {
/*long time = System.currentTimeMillis()-birthday.getTime();
Integer age = Long.valueOf(time/365/24/60/60/1000).IntegerValue();*/
Date date = new Date();
Integer age = date.getYear()-birthday.getYear();
return age;
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 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;
2.Role表的实体类
package com.tang.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;
3.Provider(供应商)表的实体类
package com.tang.pojo;
import java.util.Date;
public class Provider {
private Integer id; //id
private String proCode; //供应商编码
private String proName; //供应商名称
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 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;
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 getModifyBy() {
return modifyBy;
public void setModifyBy(Integer modifyBy) {
this.modifyBy = modifyBy;
public Date getModifyDate() {
return modifyDate;
public void setModifyDate(Date modifyDate) {
this.modifyDate = modifyDate;
resource下db.properties代码
url=jdbc:mysql://localhost:3306/smbms?useUnicode=true characterEncoding=utf8 useSSL=true";
username=root
password=root123456
2.编写数据库的公共类
Dao包下BaseDao代码如下
package com.tang.dao;
import com.mysql.cj.protocol.Resultset;
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 url;
private static String username;
private static String password;
//静态代码块，类加载的时候就初始化了
static{
Properties properties = new Properties();
//通过类加载器读取对应的资源,并将资源变为流
InputStream is = BaseDao.class.getClassLoader().getResourceAsStream("db.properties");
try {
properties.load(is);
} catch (IOException e) {
e.printStackTrace();
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;//提升作用域
try {
connection = DriverManager.getConnection(url, username, password);
} catch (SQLException throwables) {
throwables.printStackTrace();
return connection;
//编写查询公共类
public static ResultSet execute(Connection connection,String sql,Object[] params,ResultSet resultSet,PreparedStatement preparedStatement) throws SQLException {
//预编译的sql，在后面直接执行就可以了
preparedStatement = connection.prepareStatement(sql);
//问号(参数可能不止一个，且类型未知，因此用Object的数据接收参数)
for (int i = 0; i params.length; i++) {
//setObject占位符从1开始，但是我们的数组是从0开始
preparedStatement.setObject(i+1,params[i]);
resultSet = preparedStatement.executeQuery();
return resultSet;
//编写增删改的公共方法
public static int execute(Connection connection,String sql,Object[] params,PreparedStatement preparedStatement) throws SQLException {
preparedStatement = connection.prepareStatement(sql);
//问号(参数可能不止一个，且类型未知，因此用Object的数据接收参数)
for (int i = 0; i params.length; i++) {
//setObject占位符从1开始，但是我们的数组是从0开始
preparedStatement.setObject(i+1,params[i]);
int updateRows = preparedStatement.executeUpdate();
return updateRows;
//释放资源
public static boolean coloseResource(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();
flag = false;//关闭失败
if(connection != null) {
try {
connection.close();
//GC回收
connection = null;
} catch (SQLException throwables) {
throwables.printStackTrace();
flag = false;//
if(preparedStatement != null) {
try {
preparedStatement.close();
//GC回收
preparedStatement = null;
} catch (SQLException throwables) {
throwables.printStackTrace();
flag = false;
return flag;
3.编写字符编码过滤器
package com.tang.filter;
import javax.servlet.*;
import java.io.IOException;
public class CharacterEncodingFilter implements Filter {
public void init(FilterConfig filterConfig) throws ServletException {
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
servletRequest.setCharacterEncoding("utf-8");
servletResponse.setCharacterEncoding("utf-8");
servletResponse.setContentType("text/html");
filterChain.doFilter(servletRequest,servletResponse);
public void destroy() {
并在web.xml中注册Filter
filter
filter-name CharacterEncodingFilter /filter-name
filter-class com.tang.filter.CharacterEncodingFilter /filter-class
/filter
filter-mapping
filter-name CharacterEncodingFilter /filter-name
url-pattern /* /url-pattern
/filter-mapping
八、导入静态资源
在webapp下导入以下四个文件
https://files.cnblogs.com/files/blogs/755902/js.zip?t=1659085614
https://files.cnblogs.com/files/blogs/755902/images.zip?t=1659085600
https://files.cnblogs.com/files/blogs/755902/css.zip?t=1659085576
https://files.cnblogs.com/files/blogs/755902/calendar.zip?t=1659085557
九、登录界面的实现
1.设置首页
!-- 设置欢迎界面--
welcome-file-list
welcome-file login.jsp /welcome-file
/welcome-file-list
首页样子
2.编写dao层得到登录用户的接口
UserDao接口代码
package com.tang.dao.user;
import com.tang.pojo.User;
import java.sql.Connection;
import java.sql.SQLException;
public interface UserDao {
//得到要登录的用户
public User getLoginUser(Connection connection,String userCode,String userPassword) throws SQLException;
3.编写dao层得到用户接口的实现类
UserDaoImpl代码
package com.tang.dao.user;
import com.tang.dao.BaseDao;
import com.tang.pojo.User;
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,String userPassword) throws SQLException {
//准备三个对象
PreparedStatement pstm = null;
ResultSet rs = null;
User user = null;
//判断数据库连接是否成功
if(connection != null){
String sql = "select * from smbms_user where userConde=? and userPassword=?";//连接成功就给它一个SQL语句
Object[] params = {userCode, userPassword};
rs = BaseDao.execute(connection, pstm, rs, sql, params);//执行SQL
if(rs.next()){//若结果集中有数据
//得到该登录用户的信息
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);//连接可能涉及到业务，在这里先不关
return user;
4.业务层接口
package com.tang.service;
import com.tang.pojo.User;
public interface UserService {
//用户登录
public User login(String userCode,String password);
5.业务层实现类
package com.tang.service;
import com.tang.dao.BaseDao;
import com.tang.dao.user.UserDao;
import com.tang.dao.user.UserDaoImpl;
import com.tang.pojo.User;
import org.junit.Test;
import java.sql.Connection;
import java.sql.SQLException;
public class UserServiceImpl implements UserService{
//业务层都会调用dao层，所以我们要引入Dao层；
private UserDao userDao;//dao下的得到登录用户的接口
public UserServiceImpl(){
userDao = new UserDaoImpl();
public User login(String userCode, String password) {
Connection connection = null;
User user = null ;
try {
connection = BaseDao.getConnection();//得到连接
//通过业务层调用对应的具体的数据库操作
user = userDao.getLoginUser(connection, userCode, password);
} catch (SQLException throwables) {
throwables.printStackTrace();
}finally {
BaseDao.closeResource(connection,null,null);
return user;
6.编写servlet
package com.tang.servlet;
import com.tang.pojo.User;
import com.tang.service.UserServiceImpl;
import com.tang.util.Constant;
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 {
//Servlet:控制层，调用业务层代码
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("LoginServlet-- start.....");
//获取用户名和密码,注意和前端login.jsp中的参数名相同
String userCode = req.getParameter("userCode");
String userPassword = req.getParameter("userPassword");
//和数据库中的密码进行对比，调用业务层
UserServiceImpl userService = new UserServiceImpl();
User user = userService.login(userCode, userPassword);//这里已经把登录的人给查出来了
if(user != null){//查有此人，可以登录
//将用户的信息存放到Session中
req.getSession().setAttribute(Constant.USER_SESSION,user);
//跳转到主页
resp.sendRedirect("/smbms_war/jsp/frame.jsp");
else {//查无此人，无法登录
//转发会登录页面，顺带提示它，用户名或者密码错误
req.setAttribute("error","用户名或则密码不正确");//给login.jsp中的error负值，然后就会显示出来
req.getRequestDispatcher("login.jsp").forward(req,resp);
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
7.注册servlet
servlet
servlet-name LoginServlet /servlet-name
servlet-class com.tang.servlet.LoginServlet /servlet-class
/servlet
servlet-mapping
servlet-name LoginServlet /servlet-name
url-pattern /login.do /url-pattern
/servlet-mapping
到这完成用户登录的判断，如下图
解决NoClassDefFoundError: Could not initialize class
输入账号和密码之后可能出现下面的500错误，找了一天，发现在target目录下没有db.properties文件，一气之下，直接将db.properties文件直接放到BaseDao同级目录下，因为下面报错的原因就是因为这个问题，所以在清理了一下maven之后再次构建会发现target目录下有db.properties这个文件
最后问题解决
十、登录功能优化
思路：移除Session，返回登录界面
package com.tang.servlet.user;
import com.tang.util.Constant;
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 {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//移除用户的Constant.USER_SESSION
req.getSession().removeAttribute(Constant.USER_SESSION);
resp.sendRedirect("/smbms_war/login.jsp");//返回登录界面
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
web.xml中注册
servlet
servlet-name LogoutServlet /servlet-name
servlet-class com.tang.servlet.user.LogoutServlet /servlet-class
/servlet
servlet-mapping
servlet-name LogoutServlet /servlet-name
url-pattern /jsp/logout.do /url-pattern
/servlet-mapping
运行结果图
2.登录拦截
用户没有登录的情况下不能进入主页
package com.tang.filter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class SysFilter implements Filter {
public void init(FilterConfig filterConfig) throws ServletException {
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) servletRequest;
HttpServletResponse response = (HttpServletResponse) servletResponse;
//过滤器，从Session中获取用户
User user = (User) request.getSession().getAttribute(Constant.USER_SESSION);
if(user == null){//已经被移除或者注销了，或者未登录
response.sendRedirect("/smbms_war/error.jsp");
}else{
filterChain.doFilter(servletRequest,servletResponse);
filter-name SysFilter /filter-name
filter-class com.tang.filter.SysFilter /filter-class
/filter
filter-mapping
filter-name SysFilter /filter-name
url-pattern /jsp/* /url-pattern
/filter-mapping
登录完善之后运行结果图
十一、密码修改
1.导入前端素材
li a href="${pageContext.request.contextPath }/jsp/pwdmodify.jsp" 密码修改 /a /li
导入之后记得用maven的插件把target给clean一下，然后重新部署项目
2.UserDao接口
//修改当前用户密码
public int updatePwd(Connection connection,int id,int password) throws SQLException;
3.UserDao接口实现类
//修改当前用户密码，需要连接数据库，和当前用户的id,以及旧密码
public int updatePwd(Connection connection, int id, int password) throws SQLException {
PreparedStatement pstm = null;//防止SQL注入
int execute = 0;
if(connection != null){//成功连接数据库
String sql = "update smbms_user set userPassword = ? where id = ?";
Object prams[] = {password,id};//传入两个参数
execute = BaseDao.execute(connection, sql, prams, pstm);
BaseDao.closeResource(null,pstm,null);
return execute;
4.UserService接口
//根据用户id修改密码
public boolean updatePwd( int id, int password);
5.UserService实现类
public boolean updatePwd(int id, int password) {
Connection connection = null;
boolean flag= false;
//修改密码
try {
connection = BaseDao.getConnection();
if(userDao.updatePwd(connection,id,password) 0){
flag = true;//密码修改成功
} catch (Exception throwables) {
throwables.printStackTrace();
}finally{//关闭资源
BaseDao.closeResource(connection,null,null);
return flag;
6.Servlet 记得实现复用，需要提取方法
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String method = req.getParameter("method");
if(method.equals("savepwd") method != null){
this.updatePwd(req,resp);
public void updatePwd(HttpServletRequest req, HttpServletResponse resp){
//从Session里拿ID
Object o = req.getSession().getAttribute(Constant.USER_SESSION);
String newpassword = req.getParameter("newpassword");
boolean flag = false;
if(o != null !StringUtils.isNullOrEmpty(newpassword)){
UserServiceImpl userService = new UserServiceImpl();
flag = userService.updatePwd(((User) o).getId(), newpassword);
if(flag){
req.setAttribute("message","修改密码成功，请退出使用新密码登录");
//密码修改成功移除当前session
req.getSession().removeAttribute(Constant.USER_SESSION);
else{
req.setAttribute("message","密码修改失败");
}else{
req.setAttribute("message","新密码有问题");
try {
req.getRequestDispatcher("pwdmodify.jsp").forward(req,resp);
//resp.sendRedirect("/smbms_war/jsp/pwdmodify.jsp");
} catch (Exception e) {
e.printStackTrace();
7.密码验证优化Ajax
//验证旧密码，session中有用户的密码
public void pwdModify(HttpServletRequest req, HttpServletResponse resp){
//从Session里拿ID
Object o = req.getSession().getAttribute(Constant.USER_SESSION);
String oldpassword = req.getParameter("oldpassword");
//万能的map,结果集
HashMap String, String resultMap = new HashMap String, String
if(o == null){//session失效了
resultMap.put("result","sessionerror");
}else if(StringUtils.isNullOrEmpty(oldpassword)){//输入的密码为空
resultMap.put("result","error");
}else{
String userPassword = ((User) o).getUserPassword();//Session中用户的密码
if(oldpassword.equals(userPassword)){//输入的密码与原密码相同，前端显示✅
resultMap.put("result","true");
}else{//前台输入的密码与原密码不符则显示❌
resultMap.put("result","false");
try {
resp.setContentType("application/json");//让该方法返回一个json值
PrintWriter writer = resp.getWriter();
//JSONArray 阿里巴巴的JSON工具。
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