專案簡介
smbms超市訂單管理系統,主要用于用戶管理、訂單管理、供應商管理等功能,是學習JavaWeb練習的一個小專案
這個博客只講了部分功能(用戶登錄界面,和密碼修改界面),以及用戶管理的實作,
主要寫的后端的實作,
使用技術
Maven:管理依賴打包專案
Mysql:存盤業務資料
HTML:制作前端登錄頁面
Servlet:后臺服務資源完成相關業務
Tomcat:web專案部署的服務器
Filter:統一會話管理所有登錄情況
資料庫

基本框架搭建
創建dao層(資料持久層),pojo層(簡單的Java物件),service(業務層),servlet(服務器層),tools(工具層),filter(過濾層)
dao層主要進行資料庫操作,Service(業務層)呼叫dao層,并將獲得的資料傳給servlet層,
servlet層負責前后端互動,從前端獲取資料,傳到后端,并將后端獲取的資料回傳給前端
service層捕獲例外,進行事務處理
事務處理:呼叫不同dao的多個方法,必須使用同一個connection(connection作為引數傳遞)事務完成之后,需要在service層進行connection的關閉,在dao層關閉(PreparedStatement和ResultSet物件)
pojo層主要是與資料庫對應的一些物件
過濾器層首先要寫編碼過濾層,防止前后端編碼不一致亂碼情況
專案頁面
登錄界面

系統首頁

密碼修改頁面

用戶管理首頁

專案搭建
1、搭建一個maven web專案
2、配置tomcat
3、測驗專案能否跑起來
4、匯入專案中會遇到的jar包
jsp,servlet,mysql驅動,jstl,stand…
5、創建專案包結構

6、撰寫物體類
ORM映射:表-類映射
7、撰寫基礎公共類
? 1、資料庫組態檔
driver=com.mysql:jdbc.Driver
url=jdbc:mysql://localhost:3306?useUnicode=true&characterEncoding=utf-8
username=root
password=123456
3、撰寫字符編碼過濾器
主要是為了前后端連接不出現亂碼情況
public class CharacterEncoding implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
servletRequest.setCharacterEncoding("utf-8");
servletResponse.setCharacterEncoding("utf-8");
filterChain.doFilter(servletRequest,servletResponse);
}
@Override
public void destroy() {
}
}
8、匯入靜態資源
登錄功能實作

1、撰寫前端頁面
- 先在web.xml中設定welcome-file-list
- 前端頁面 login.jsp
- loginservlet
- request.getparam()獲取前端資料
- 呼叫業務層
- 匹配成功的話設定session,頁面重定向,否則,提示錯誤(設定頁面error屬性)
2、設定首頁
<!--設定歡迎頁面 -->
<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>
3、撰寫dao層登錄用戶登錄的介面
按照資料庫創建物件user類
public interface UserDao {
//得到要登錄的用戶
public User getLoginUser(Connection connection,String userCode) throws Exception;
}
BaseDao類
資料庫操作的方法(連接、查詢、更新)
package dao;
import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;
public class BaseDao {
private static String driver;
private static String url;
private static String username;
private static String password;
//靜態代碼塊,類加載的時候就初始化了
static {
Properties properties = new Properties();
//通過類加載器讀取對應的資源
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");
}
//獲取資料庫的鏈接
public static Connection getConnection(){
Connection connection = null;
try {
Class.forName("com.mysql.jdbc.Driver");
connection = DriverManager.getConnection(url, username, password);
} catch (Exception e) {
e.printStackTrace();
}
return connection;
}
//撰寫查詢公共方法
public static ResultSet execute(Connection connection,PreparedStatement preparedStatement,ResultSet resultSet,String sql,Object[] params) throws SQLException {
//預編譯的sql,在后面直接執行就可以了
preparedStatement = connection.prepareStatement(sql);
for (int i = 0; i < params.length; i++) {
//setObject,占位符從1開始,但是我們的陣列是從0開始!
preparedStatement.setObject(i+1,params[i]);
}
resultSet = preparedStatement.executeQuery();
return resultSet;
}
//撰寫增刪改公共方法
public static int execute(Connection connection,String sql,Object[] params,PreparedStatement preparedStatement) throws SQLException {
preparedStatement = connection.prepareStatement(sql);
for (int i = 0; i < params.length; i++) {
//setObject,占位符從1開始,但是我們的陣列是從0開始!
preparedStatement.setObject(i+1,params[i]);
}
int updateRows = preparedStatement.executeUpdate();
return updateRows;
}
4、撰寫dao介面的實作類
public class UserDaoImpl implements UserDao{
@Override
public User getLoginUser(Connection connection, String userCode)
throws Exception {
// TODO Auto-generated method stub
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;
}
}
5、撰寫業務層介面
public interface UserService {
//用戶登錄
public User login(String userCode,String userPassword);
}
6、撰寫業務層介面的實作類
public class UserServiceImpl implements UserService{
//業務層都會呼叫dao層,所以我們要引入dao層
private UserDao userDao;
public UserServiceImpl(){
userDao = new UserDaoImpl();
}
public User login(String userCode,String password){
Connection connection=null;
User user=null;
//通過業務層呼叫對應的具體的資料庫操作
try {
connection= BaseDao.getConnection();
user=userDao.getLoginUser(connection,userCode);
} catch (Exception e) {
e.printStackTrace();
}finally {
BaseDao.closeResource(connection,null,null);
}
return user;
}
7、撰寫servlet類
public class LoginServlet extends HttpServlet {
//Servlet:控制層,呼叫業務層代碼
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("LoginServlet--start....");
//獲取用戶名和密碼
String userCode = req.getParameter("userCode");
String userPassword = req.getParameter("userPassword");
//和資料庫中的密碼進行對比,呼叫業務層;
UserService userService = new UserServiceImpl();
User user = userService.login(userCode, userPassword); //這里已經把登錄的人給查出來了
System.out.println(userCode);
System.out.println(userPassword);
if (user!=null){ //查有此人,可以登錄
//將用戶的資訊放到Session中;
req.getSession().setAttribute(Constants.USER_SESSION,user);
//跳轉到主頁重定向
resp.sendRedirect("jsp/frame.jsp");
}else {//查無此人,無法登錄
//轉發回登錄頁面,順帶提示它,用戶名或者密碼錯誤;
req.setAttribute("error","用戶名或者密碼不正確");
req.getRequestDispatcher("login.jsp").forward(req,resp);
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
}
8、注冊servlet
寫完一個servlet記得去注冊
<servlet>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>servlet.user.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/login.do</url-pattern>
</servlet-mapping>
9、測驗訪問,確保以上功能實作
登錄功能優化
移除session
public class LogoutServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//移除用戶的session
req.getSession().removeAttribute(Constants.USER_SESSION);
resp.sendRedirect(req.getContextPath()+"/login.jsp");//回傳登錄頁面
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
super.doPost(req, resp);
}
}
注冊xml
<servlet>
<servlet-name>LogoutServlet</servlet-name>
<servlet-class>servlet.user.LogoutServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LogoutServlet</servlet-name>
<url-pattern>/jsp/logout.do</url-pattern>
</servlet-mapping>
登錄攔截優化
正常情況下退出系統后是登錄不了的,但是目前直接輸入地址還是能夠登錄,所以要進行優化
撰寫一個過濾器并注冊
public class SysFilter implements Filter {
public void init(FilterConfig filterConfig) throws ServletException {
}
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) resp;
//過濾器,從Session中獲取用戶,
User user = (User) request.getSession().getAttribute(Constants.USER_SESSION);
if (user==null){ //已經被移除或者注銷了,或者未登錄
response.sendRedirect("/smbms/error.jsp");
}else {
chain.doFilter(req,resp);
}
}
public void destroy() {
}
}
<filter>
<filter-name>Sysfilter</filter-name>
<filter-class>filter.SysFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>Sysfilter</filter-name>
<url-pattern>/jsp/*</url-pattern>
</filter-mapping>
密碼修改
匯入前端素材
從底層開始寫

UserDao介面實作類
//修改當前用戶密碼
//增刪改都會影響資料庫的變化,所以是回傳int型別,說明有幾行受到了影響
@Override
public int updatePwd(Connection connection, int id, int password) throws Exception {
int updateRow=0;
PreparedStatement pstm=null;
if (connection!=null){
String sql="UPDATE `smbms_user` SET `userPassword`=? WHERE `id`=? ";
Object[] params={password,id};
BaseDao.execute(connection,sql,params,pstm);
}
BaseDao.closeResource(null,pstm,null);
return updateRow;
}
UserService層
進行事務處理,呼叫dao層,查找servlet層傳來的資料的相關用戶,并于servlet層資料進行對比
//修改密碼
public boolean updatePwd(int id,int pwd);
UserService層實作類
public boolean updatePwd(int id, int pwd) {
Connection connection=null;
boolean flag=false;
try {
connection = BaseDao.getConnection();
if (userDao.updatePwd(connection, id, pwd)>0){
flag=true;
}
} catch (Exception e) {
e.printStackTrace();
}finally {
BaseDao.closeResource(connection,null,null);
}
return flag;
}
撰寫修改密碼的servlet類
獲取資料庫用戶資料,并設定session屬性userlist
public class UserServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String method = req.getParameter("method");
if (method.equals("savepwd")&&method!=null){
this.modifyPwd(req,resp);
}else if (method.equals("pwdmodify")&&method!=null){
this.pwdmodify(req,resp);
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
//修改密碼
public void modifyPwd(HttpServletRequest req, HttpServletResponse resp){
//獲取要修改的密碼和id
Object attribute = req.getSession().getAttribute(Constants.USER_SESSION);
String newpassword = req.getParameter("newpassword");
boolean flag = false;
//判斷這個session和新密碼是否存在
if(attribute!=null && !StringUtils.isNullOrEmpty(newpassword)){
UserServiceImpl userService = new UserServiceImpl();
flag = userService.modifyPwd(((User) attribute).getId(), newpassword);
if(flag){
req.setAttribute("message","修改密碼成功");
//密碼修改成功移除當前session
req.getSession().removeAttribute(Constants.USER_SESSION);
}else {
req.setAttribute("message","密碼修改失敗");
}
}else{
//新密碼有問題
req.setAttribute("message","新密碼有問題");
}
try {
req.getRequestDispatcher("pwdmodify.jsp").forward(req,resp);
} catch (ServletException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
注冊userservlet
<servlet>
<servlet-name>userServlet</servlet-name>
<servlet-class>servlet.user.UserServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>userServlet</servlet-name>
<url-pattern>/jsp/user.do</url-pattern>
</servlet-mapping>
密碼修改成功界面

優化密碼修改使用Ajax
AJAX = 異步 JavaScript 和 XML,
AJAX 是一種用于創建快速動態網頁的技術,
通過在后臺與服務器進行少量資料交換,AJAX 可以使網頁實作異步更新,這意味著可以在不重新加載整個網頁的情況下,對網頁的某部分進行更新,
傳統的網頁(不使用 AJAX)如果需要更新內容,必需多載整個網頁面,
有很多使用 AJAX 的應用程式案例:新浪微博、Google 地圖、開心網等等,
使用jQuery需要匯入jQuery,使用Vue匯入Vue,兩個都用,自己原生態實作

三步曲:
1、撰寫對應處理的controller,回傳訊息或者字串或者json格式的資料
2、撰寫ajax請求
- url:controller請求
- data:鍵值對
- success:回呼函式
3、給ajax系結事件,點擊,click,失去焦點onblur,鍵盤彈起keyup
用戶管理實作
思路:

1、匯入分頁的工具類
2、用戶串列頁面匯入
獲取用戶數量
1、UserDao
//查詢用戶總數
public int getUserCount(Connection connection,String username ,int userRole)throws SQLException;
2、UserDaoImpl
public int getUserCount(Connection connection, String username, int userRole) throws SQLException {
//根據用戶名或者角色查詢用戶總數
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>();//存放我們的引數
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轉換為陣列
Object[] params = list.toArray();
System.out.println("UserDaoImpl->getUserCount:"+sql.toString()); //輸出最后完整的SQL陳述句
rs = BaseDao.execute(connection, pstm, rs, sql.toString(), params);
if (rs.next()){
count = rs.getInt("count"); //從結果集中獲取最終的數量
}
BaseDao.closeResource(null,pstm,rs);
}
return count;
}
3、UserService
//查詢記錄數
public int getUserCount(String username,int userRole);
4、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;
}
獲取用戶串列
1、userdao
//通過條件查詢-userList
public List<User> getUserList(Connection connection, String userName, int userRole, int currentPageNo, int pageSize)throws Exception;
2、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;
}
3、userservice
//根據條件查詢用戶串列
public List<User> getUserList(String queryUserName, int queryUserRole, int currentPageNo, int pageSize);
4、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) {
e.printStackTrace();
}finally{
BaseDao.closeResource(connection, null, null);
}
return userList;
}
獲取角色操作
1、roledao
public interface RoleDao {
//獲取角色串列
public List<Role> getRoleList(Connection connection) throws SQLException;
}
2、roledaoImpl
public class RoleDaoImpl implements RoleDao {
//獲取角色串列
public List<Role> getRoleList(Connection connection) throws SQLException {
PreparedStatement pstm = null;
ResultSet resultSet = null;
ArrayList<Role> roleList = new ArrayList<Role>();
if (connection!=null){
String sql = "select * from smbms_role";
Object[] params = {};
resultSet = 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;
}
}
3、roleservice
//獲取角色串列
public List<Role> getRoleList();
4、roleserviceImpl
public class RoleServiceImpl implements RoleService {
//引入Dao
private RoleDao roleDao;
public RoleServiceImpl() {
roleDao = new RoleDaoImpl();
}
public List<Role> getRoleList() {
Connection connection = null;
List<Role> roleList = null;
try {
connection = BaseDao.getConnection();
roleList = roleDao.getRoleList(connection);
} catch (SQLException e) {
e.printStackTrace();
} finally {
BaseDao.closeResource(connection,null,null);
}
return roleList;
}
}
userservlet中添加query方法
頁面沒有實作分頁,而是全部顯示在了一頁,加入分頁查詢
//query方法
public void query(HttpServletRequest req, HttpServletResponse resp){
//查詢用戶串列
//從前端獲取資料;
String queryUserName = req.getParameter("queryname");
String temp = req.getParameter("queryUserRole");
String pageIndex = req.getParameter("pageIndex");
int queryUserRole = 0;
//獲取用戶串列
UserServiceImpl userService = new UserServiceImpl();
List<User> userList = null;
//第一次走這個請求,一定是第一頁,頁面大小固定的;
int pageSize = 5; //可以把這個些到組態檔中,方便后期修改;
int currentPageNo = 1;
if (queryUserName ==null){
queryUserName = "";
}
if (temp!=null && !temp.equals("")){
queryUserRole = Integer.parseInt(temp); //給查詢賦值!0,1,2,3
}
if (pageIndex!=null){
currentPageNo = Integer.parseInt(pageIndex);
}
//獲取用戶的總數 (分頁: 上一頁,下一頁的情況)
int totalCount = userService.getUserCount(queryUserName, queryUserRole);
//總頁數支持
PageSupport pageSupport = new PageSupport();
pageSupport.setCurrentPageNo(currentPageNo);
pageSupport.setPageSize(pageSize);
pageSupport.setTotalCount(totalCount);
int totalPageCount = ((int)(totalCount/pageSize))+1;
//控制首頁和尾頁
//如果頁面要小于1了,就顯示第一頁的東西
if (currentPageNo<1){
currentPageNo = 1;
}else if (currentPageNo>totalPageCount){ //當前頁面大于了最后一頁;
currentPageNo = totalPageCount;
}
//獲取用戶串列展示
userList = userService.getUserList(queryUserName, queryUserRole, currentPageNo, pageSize);
req.setAttribute("userList",userList);
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);
//回傳前端
try {
req.getRequestDispatcher("userlist.jsp").forward(req,resp);
} catch (ServletException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
差不多登錄和用戶管理模塊就是這些了
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標籤:其他
