SMBMS项目（超市订单管理系统）
架构：
数据库：
项目如何搭建？
考虑使用不使用Maven? 依赖，Jar
1、项目搭建
- 搭建一个maven web 项目
- 配置Tomcat
- 测试项目是否能够跑起来
- 导入项目中会遇到的Jar包
jsp，Servlet，mysql驱动，jstl，stand… - 创建项目包结构
- 编写实体类
ORM映射：表-类映射 - 编写基础公共类
- 数据库配置文件
mysql.driver=com.mysql.jdbc.Driver
mysql.url=jdbc:mysql://localhost:3306/smbms?useUnicode=true&characterEncoding=utf-8
mysql.name=root
mysql.password=123456- 编写数据库的公共类
package com.cj.dao;
import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;
public class BaseDao {
//静态代码块,在类加载的时候执行
static{
init();
}
private static String driver;
private static String url;
private static String user;
private static String password;
//初始化连接参数,从配置文件里获得
public static void init(){
Properties params=new Properties();
String configFile = "db.properties";
InputStream is= BaseDao.class.getClassLoader().getResourceAsStream(configFile);
try {
params.load(is);
} catch (IOException e) {
e.printStackTrace();
}
driver=params.getProperty("driver");
url=params.getProperty("url");
user=params.getProperty("user");
password=params.getProperty("password");
}
/**
* 获取数据库连接
* @return
*/
public static Connection getConnection(){
Connection connection = null;
try {
Class.forName(driver);
connection = DriverManager.getConnection(url, user, password);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return connection;
}
/**
* 查询操作
* @param connection
* @param pstm
* @param rs
* @param sql
* @param params
* @return
*/
public static ResultSet execute(Connection connection, PreparedStatement pstm, ResultSet rs,
String sql, Object[] params) throws Exception{
pstm = connection.prepareStatement(sql);
for(int i = 0; i < params.length; i++){
pstm.setObject(i+1, params[i]);
}
rs = pstm.executeQuery();
return rs;
}
/**
* 更新操作
* @param connection
* @param pstm
* @param sql
* @param params
* @return
* @throws Exception
*/
public static int execute(Connection connection,PreparedStatement pstm,
String sql,Object[] params) throws Exception{
int updateRows = 0;
pstm = connection.prepareStatement(sql);
for(int i = 0; i < params.length; i++){
pstm.setObject(i+1, params[i]);
}
updateRows = pstm.executeUpdate();
return updateRows;
}
/**
* 释放资源
* @param connection
* @param pstm
* @param rs
* @return
*/
public static boolean closeResource(Connection connection,PreparedStatement pstm,ResultSet rs){
boolean flag = true;
if(rs != null){
try {
rs.close();
rs = null;//GC回收
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
flag = false;
}
}
if(pstm != null){
try {
pstm.close();
pstm = null;//GC回收
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
flag = false;
}
}
if(connection != null){
try {
connection.close();
connection = null;//GC回收
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
flag = false;
}
}
return flag;
}
}- 编写字符编码过滤器
- 导入静态资源
2、登录功能实现
页面文字乱码，检查js文件，把编码格式变成GBK
或者在jsp页面加入
<%@ page contentType="text/html;charset=UTF-8" language="java" %>jsp页面加载报错时，导入
若报错找不到包，在WEB-INF新建lib包，把项目依赖包导入
- 编写前端页面
- 设置首页
<!--设置欢迎页面-->
<welcome-file-list>
<welcome-file>/login.jsp</welcome-file>
</welcome-file-list>- 编写dao层登录用户登录的接口
@Override
public User getLoginUser(Connection connection, String userCode)
throws Exception- 编写dao接口的实现类
PreparedStatement pstm = null;
ResultSet rs = null;
User user = null;
if(null != connection){
String sql = "select * from smbms_user where userCode=?";
Object[] params = {userCode};
rs = BaseDao.execute(connection, pstm, rs, sql, params);
if(rs.next()){
user = new User();
user.setId(rs.getInt("id"));
user.setUserCode(rs.getString("userCode"));
user.setUserName(rs.getString("userName"));
user.setUserPassword(rs.getString("userPassword"));
user.setGender(rs.getInt("gender"));
user.setBirthday(rs.getDate("birthday"));
user.setPhone(rs.getString("phone"));
user.setAddress(rs.getString("address"));
user.setUserRole(rs.getInt("userRole"));
user.setCreatedBy(rs.getInt("createdBy"));
user.setCreationDate(rs.getTimestamp("creationDate"));
user.setModifyBy(rs.getInt("modifyBy"));
user.setModifyDate(rs.getTimestamp("modifyDate"));
}
BaseDao.closeResource(null, pstm, rs);
}
return user;
}- 业务层
//用户登录
public User login(String userCode,String password);- 业务层实现类
public class UserServiceImpl implements UserService {
//业务层都会调用dao层，所以我们要引入Dao层；
private UserDao userDao;
public UserServiceImpl(){
userDao = new UserDaoImpl();
}
@Override
public User login(String userCode, String userPassword) {
// TODO Auto-generated method stub
Connection connection = null;
User user = null;
try {
connection = BaseDao.getConnection();
user = userDao.getLoginUser(connection, userCode);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
BaseDao.closeResource(connection, null, null);
}
//匹配密码
if(user != null){
if(!user.getUserPassword().equals(userPassword)) {
user = null;
}
}
return user;
}
@Test
public void test(){
UserServiceImpl userService = new UserServiceImpl();
User admin = userService.login("wen", "123");
System.out.println(admin.getUserPassword());
}
}- 编写Servlet
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 {
doPost(req,resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("login ============ " );
//获取用户名和密码
String userCode = req.getParameter("userCode");
String userPassword = req.getParameter("userPassword");
//调用service方法，进行用户匹配
UserService userService = new UserServiceImpl();
User user = userService.login(userCode,userPassword);
//登录成功
if(user != null){
//放入session
req.getSession().setAttribute(Constants.USER_SESSION, user);
//页面跳转（frame.jsp）
resp.sendRedirect("jsp/frame.jsp");
}else{
//页面跳转（login.jsp）带出提示信息--转发
req.setAttribute("error", "用户名或密码不正确");
req.getRequestDispatcher("login.jsp").forward(req, resp);
}
}
}- 注册Servlet
<servlet>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>com.cj.servlet.user.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/login.do</url-pattern>
</servlet-mapping>- 测试访问，确保以上功能成功！
3、登录功能优化
注销功能：
思路：移除Session，返回登录页面
package com.cj.servlet.user;
import com.cj.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 {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//移除用户的Constants.USER_SESSION
req.getSession().removeAttribute(Constants.USER_SESSION);
resp.sendRedirect(req.getContextPath() + "/login.jsp"); //返回登录页面
}
}注册xml
<servlet>
<servlet-name>LogoutServlet</servlet-name>
<servlet-class>com.cj.servlet.user.LogoutServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LogoutServlet</servlet-name>
<url-pattern>/jsp/logout.do</url-pattern>
</servlet-mapping>4、登录拦截优化
package com.cj.filter;
import com.cj.util.Constants;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class SysFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) servletRequest;
HttpServletResponse resq = (HttpServletResponse) servletResponse;
Object user_session = req.getSession().getAttribute(Constants.USER_SESSION);
if (user_session == null) {
resq.sendRedirect(req.getContextPath() + "/error.jsp");
}else{
filterChain.doFilter(servletRequest, servletResponse);
}
}
@Override
public void destroy() {
}
}xml编写：
<!--用户登录过滤器-->
<filter>
<filter-name>SysFilter</filter-name>
<filter-class>com.cj.filter.SysFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>SysFilter</filter-name>
<url-pattern>/jsp/*</url-pattern>
</filter-mapping>测试，登录，注销，权限，都要保证OK ！
5、密码修改
- 导入前端素材
<li><a href="${pageContext.request.contextPath }/jsp/pwdmodify.jsp">密码修改</a></li>- 写项目，建议从底层向上写
- UserDao 接口
//修改当前用户密码
public int updatePwd(Connection connection,int id,int password) throws SQLException;- UserDao 接口实现类
public int updatePwd(Connection connection, int id, int password) throws Exception {
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;
}- UserService层
//根据用户ID修改密码
public int updatePwd(Connection connection,int id,int password) throws SQLException;- UserService实现类
public Boolean updatePwd(int id, int password){
Connection connection = null;
boolean flag = false;
try {
//修改密码
connection = BaseDao.getConnection();
if(userDao.updatePwd(connection,id,password)>0){
flag = true;
}
} catch (Exception e) {
e.printStackTrace();
}finally {
BaseDao.closeResource(connection, null, null);
}
return flag;
}- UserServlet编写
public void updatePwd(HttpServletRequest req,HttpServletResponse resp) throws ServletException, IOException {
//从Session里面拿ID；
Object o = req.getSession().getAttribute(Constants.USER_SESSION);
String newpassword = req.getParameter("newpassword");
boolean flag = false;
System.out.println(o != null);
System.out.println(StringUtils.isNullOrEmpty(newpassword));
if (o != null && !StringUtils.isNullOrEmpty(newpassword)) {
UserService 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");
//密码修改成功后，移除当前Session
req.getSession().removeAttribute(Constants.USER_SESSION);
} else {
req.setAttribute("message", "修改密码失败");
}
} else {
req.setAttribute("message", "新密码有问题");
}
req.getRequestDispatcher("pwdmodify.jsp").forward(req,resp);
}- Servlet记得实现复用，需要提取出方法
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String method = req.getParameter("method");
if (method.equals("savepwd") && method != null) {
this.updatePwd(req, resp);
}
}优化密码修改使用Ajax；
- 阿里巴巴的fastjson
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>2.0.5</version>
</dependency>- pwdModify验证密码方法编写
//验证旧密码，session中有用户的密码
public void pwdModify(HttpServletRequest req,HttpServletResponse resp){
//从Session里面拿ID；
Object o = req.getSession().getAttribute(Constants.USER_SESSION);
String oldpassword = req.getParameter("oldpassword");
//万能的Map ：结果集
Map<String, String> resultMap = new HashMap<>();
if (o == null) { //Session失效了，session过期了
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)) {
resultMap.put("result", "true");
}else {
resultMap.put("result", "false");
}
}
try {
resp.setContentType("application/json");
PrintWriter outPrintWriter = resp.getWriter();
outPrintWriter.write(JSONArray.toJSONString(resultMap));
outPrintWriter.flush();
outPrintWriter.close();
} catch (IOException e) {
e.printStackTrace();
}
}- 测试
6、用户管理实现
思路：
- 导入分页的工具类
- 用户列表页面导入
userlist.jsp
1、获取用户数量
- UserDao
//查询用户总数
public int getUserCount(Connection connection,String username,int userRole) throws SQLException;- UserDaoImpl
public 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<>(); //存放我们的参数
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转换为数组
Object[] params = list.toArray();
System.out.println("UserDaoImpl->getUserCount:" + sql.toString()); //输出最后完整的SQL语句
try {
rs = BaseDao.execute(connection, pstm, rs, sql.toString(), params);
} catch (Exception e) {
e.printStackTrace();
}
if (rs.next()) {
count = rs.getInt("count"); //从结果集中获取最终的数量
}
BaseDao.closeResource(null, pstm, rs);
}
return count;
}- UserService
//查询记录数
public int getUserCount(String username, int userRole);- UserServiceImpl
public int getUserCount(String username, int userRole) {
Connection connection = null;
int count = 0;
try {
connection = BaseDao.getConnection();
count = userDao.getUserCount(connection, username, userRole);
} catch (SQLException e) {
e.printStackTrace();
}finally {
BaseDao.closeResource(connection, null, null);
}
return count;
}2、获取用户列表
- UserDao
//通过条件查询-userList
public List<User> getUserList(Connection connection, String userName, int userRole, int currentPageNo, int pageSize)throws Exception;- UserDaoImpl
public List<User> getUserList(Connection connection, String userName, int userRole, int currentPageNo, int pageSize) throws Exception {
PreparedStatement pstm = null;
ResultSet rs = null;
List<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");
List<Object> list = new ArrayList<Object>();
if(!StringUtils.isNullOrEmpty(userName)){
sql.append(" and u.userName like ?");
list.add("%"+userName+"%");
}
if(userRole > 0){
sql.append(" and u.userRole = ?");
list.add(userRole);
}
sql.append(" order by creationDate 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()){
User _user = new User();
_user.setId(rs.getInt("id"));
_user.setUserCode(rs.getString("userCode"));
_user.setUserName(rs.getString("userName"));
_user.setGender(rs.getInt("gender"));
_user.setBirthday(rs.getDate("birthday"));
_user.setPhone(rs.getString("phone"));
_user.setUserRole(rs.getInt("userRole"));
_user.setUserRoleName(rs.getString("userRoleName"));
userList.add(_user);
}
BaseDao.closeResource(null, pstm, rs);
}
return userList;
}- UserService
//根据条件查询用户列表
public List<User> getUserList(String queryUserName, int queryUserRole, int currentPageNo, int pageSize);- UserServiceImpl
public 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("currentPageNo ---- > " + currentPageNo);
System.out.println("pageSize ---- > " + pageSize);
try {
connection = BaseDao.getConnection();
userList = userDao.getUserList(connection, queryUserName,queryUserRole,currentPageNo,pageSize);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
BaseDao.closeResource(connection, null, null);
}
return userList;
}3、获取角色操作
- RoleDao
//获取角色列表
public List<Role> getRoleList(Connection connection) throws Exception;- RoleDaoImpl
public List<Role> getRoleList(Connection connection) throws Exception {
PreparedStatement pstm = null;
ResultSet rs = null;
List<Role> roleList = new ArrayList<Role>();
if(connection != null){
String sql = "select * from smbms_role";
Object[] params = {};
rs = BaseDao.execute(connection, pstm, rs, sql, params);
while(rs.next()){
Role _role = new Role();
_role.setId(rs.getInt("id"));
_role.setRoleCode(rs.getString("roleCode"));
_role.setRoleName(rs.getString("roleName"));
roleList.add(_role);
}
BaseDao.closeResource(null, pstm, rs);
}
return roleList;
}- RoleService
public interface RoleService {
public List<Role> getRoleList();
}- RoleServiceImpl
public class RoleServiceImpl implements RoleService {
private RoleDao roleDao;
public RoleServiceImpl(){
roleDao = new RoleDaoImpl();
}
@Override
public List<Role> getRoleList() {
Connection connection = null;
List<Role> roleList = null;
try {
connection = BaseDao.getConnection();
roleList = roleDao.getRoleList(connection);
} catch (Exception e) {
e.printStackTrace();
}finally{
BaseDao.closeResource(connection, null, null);
}
return roleList;
}
}4、用户显示的Servlet
- 获取用户前端的数据（查询）
- 判断请求是否需要执行，看参数的值判断
- 为了实现分页，需要计算出当前页面和总页面，页面大小…
- 用户列表展示
private void query(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//查询用户列表
//从前端获取数据
String queryUserName = request.getParameter("queryname");
String temp = request.getParameter("queryUserRole");
String pageIndex = request.getParameter("pageIndex");
int queryUserRole = 0;
//获取用户列表
UserService userService = new UserServiceImpl();
//第一次走页面一定是第一页,页面大小固定的
List<User> userList = null;
//设置页面容量
int pageSize = Constants.pageSize;
//当前页码
int currentPageNo = 1;
/**
* http://localhost:8090/SMBMS/userlist.do
* ----queryUserName --NULL
* http://localhost:8090/SMBMS/userlist.do?queryname=
* --queryUserName ---""
*/
System.out.println("queryUserName servlet--------"+queryUserName);
System.out.println("queryUserRole servlet--------"+queryUserRole);
System.out.println("query pageIndex--------- > " + pageIndex);
if(queryUserName == null){
queryUserName = "";
}
if(temp != null && !temp.equals("")){
queryUserRole = Integer.parseInt(temp);//给查询赋值
}
if(pageIndex != null){
try{
currentPageNo = Integer.valueOf(pageIndex);
}catch(NumberFormatException e){
response.sendRedirect("error.jsp");
}
}
//总数量（表）
int totalCount = userService.getUserCount(queryUserName,queryUserRole);
//总页数
PageSupport pages=new PageSupport();
pages.setCurrentPageNo(currentPageNo);
pages.setPageSize(pageSize);
pages.setTotalCount(totalCount);
int totalPageCount = pages.getTotalPageCount();
//控制首页和尾页
if(currentPageNo < 1){
currentPageNo = 1;
}else if(currentPageNo > totalPageCount){
currentPageNo = totalPageCount;
}
userList = userService.getUserList(queryUserName,queryUserRole,currentPageNo, pageSize);
request.setAttribute("userList", userList);
List<Role> roleList = null;
RoleService roleService = new RoleServiceImpl();
roleList = roleService.getRoleList();
request.setAttribute("roleList", roleList);
request.setAttribute("queryUserName", queryUserName);
request.setAttribute("queryUserRole", queryUserRole);
request.setAttribute("totalPageCount", totalPageCount);
request.setAttribute("totalCount", totalCount);
request.setAttribute("currentPageNo", currentPageNo);
request.getRequestDispatcher("userlist.jsp").forward(request, response);
}小黄鸭调式法：自言自语
项目截图：
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