SMBMS

admin • 2021-11-12 21:06 • 数据库

SMBMS

项目搭建准备工作

搭建一个maven，web工程
配置tomcat
测试项目能不能跑起来
导入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

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/ssmbuild?useUnicode=true&characterEncoding=utf8
username=root
password=root

编写数据库的公共类

package com.kuang.dao;

import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;

//操作数据库的公共类
public class BaseDao{
    private static String driver;
    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 {
        //通过类加载器读取对应的资源
        Properties properties = new Properties();
        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");
    }
    //获取数据库的连接
    public static Connection getConnection() throws Exception{
        Class.forName(driver);
        Connection connection = DriverManager.getConnection(url, username, password);
        return connection;
    }
    //编写查询公共类
    public static ResultSet execute(Connection connection, String sql,Object[] params, ResultSet rs, PreparedStatement preparedStatement)throws Exception{
        preparedStatement = connection.prepareStatement(sql);
        for (int i = 0; i <params.length; i++) {
            //setObject,占位符从1开始，但是我们的数组从0开始
            preparedStatement.setObject(i+1,params[i]);
        }
        rs = preparedStatement.executeQuery();
        return rs;
    }
    //编写增删改公共类
    public static int execute(Connection connection, String sql,Object[] params, PreparedStatement preparedStatement)throws Exception{
        preparedStatement = connection.prepareStatement(sql);
        for (int i = 0; i <params.length; i++) {
            //setObject,占位符从1开始，但是我们的数组从0开始
            preparedStatement.setObject(i+1,params[i]);
        }
        int update = preparedStatement.executeUpdate();
        return update;
    }
    public static void closeResourc(Connection connection,PreparedStatement preparedStatement,ResultSet resultSet) throws SQLException {

        if (resultSet!=null&&preparedStatement!=null&&connection!=null){
            resultSet.close();
            preparedStatement.close();
            connection.close();
        }
    }
}

编写字符编码过滤器

package com.kuang.filter;

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

public class CharacterEncodingFilter 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() {

    }
}

记得在web.xml中形成映射

导入静态资源

登录功能实现

编写前端页面

设置首页

    <welcome-file-list>
        <welcome-file>login.jsp</welcome-file>
    </welcome-file-list>

编写dao层用户登录的接口

public interface UserDao {
    public User getLoginUser(Connection connection,String userCode) throws Exception;
}

编写dao层用户登录的实现类

package com.kuang.dao.User;

import com.kuang.dao.BaseDao;
import com.kuang.pojo.User;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class UserDaoImpl implements UserDao{
    @Override
    public User getLoginUser(Connection connection, String userCode) throws Exception{
        PreparedStatement preparedStatement =null;
        ResultSet resultSet=null;
        User user=null;
        String sql = "select * from smbms_user where userCode = ?";
        Object[] params={userCode};
        resultSet=BaseDao.execute(connection,sql,params,resultSet,preparedStatement);
        if (resultSet.next()){
            user=new User();
            user.setId((resultSet.getInt("id")));
            user.setUserCode(resultSet.getString("userCode"));
            user.setUserName(resultSet.getString("userName"));
            user.setUserPassword(resultSet.getString("userPassword"));
            user.setGender(resultSet.getInt("gender"));
            user.setBirthday(resultSet.getDate("birthday"));
            user.setPhone(resultSet.getString("phone"));
            user.setAddress(resultSet.getString("address"));
            user.setUserRole(resultSet.getInt("userRole"));
            user.setCreatedBy(resultSet.getInt("createdBy"));
            user.setCreationDate(resultSet.getTimestamp("creationDate"));
            user.setModifyBy(resultSet.getInt("modifyBy"));
            user.setModifyDate(resultSet.getTimestamp("modifyDate"));
        }
        BaseDao.closeResourc(connection,preparedStatement,resultSet);
        return user;
    }
}

业务层接口

//用户登录
public User login(String userCode,String password);

业务层实现类

package com.kuang.service.user;

import com.kuang.dao.BaseDao;
import com.kuang.dao.User.UserDao;
import com.kuang.dao.User.UserDaoImpl;
import com.kuang.pojo.User;
import org.junit.Test;

import java.sql.Connection;

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 password) {
        Connection connection=null;
        User user =null;
        try {
            connection= BaseDao.getConnection();
            //通过业务层调用对应的具体的数据库操作
            user =userDao.getLoginUser(connection,userCode);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return user;
    }
    @Test
    public void test(){
        UserServiceImpl userService = new UserServiceImpl();
        User admin = userService.login("admin", "12");
        System.out.println(admin.getUserPassword());
    }
}

编写servlet

package com.kuang.servlet.user;

import com.kuang.pojo.User;
import com.kuang.service.user.UserServiceImpl;
import com.kuang.util.Constansts;

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

public class LoginServlet extends HttpServlet {
    //控制层，调用业务层代码
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("Jin");
        //获取用户名的代码
        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查出来了
        if (user!=null){//将用户的信息放到session中
            req.getSession().setAttribute(Constansts.USER_SESSION,user);
            //跳转到主页
            resp.sendRedirect("jsp/frame.jsp");
        }
        else {//查无此人，无法登录，转发回登录页面，顺带提示它，用户名或者密码错误
            req.setAttribute("error","用户名或者密码不正确");
            req.getRequestDispatcher("login.jsp").forward(req,resp);
        }
    }

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

注册servlet

    <servlet>
        <servlet-name>LoginServlet</servlet-name>
        <servlet-class>com.kuang.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

优化登录功能

注销功能：

思路：移除Session，返回登录页面

public class LogoutServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //移除用户的Constants.USER_SESSION
        req.getSession().removeAttribute(Constansts.USER_SESSION);
        resp.sendRedirect("/login.jsp");//返回登录页面
    }

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

注册xml

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

登录拦截优化

编写一个过滤器，并注册

public class SysFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain Chain) throws IOException, ServletException {
        HttpServletRequest request=(HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) resp;
        User user= (User)request.getSession().getAttribute(Constansts.USER_SESSION);
        if (user==null){//已经被移除或者注销了，或者未登录
            response.sendRedirect("/error.jsp");
        }
        else{
            Chain.doFilter(req,resp);
        }
    }

    @Override
    public void destroy() {

    }
}

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

密码修改

导入前端素材
写项目，建议从底层往上写

UserDao接口

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

UserDao接口实现类

    public int updatePwd(Connection connection, int id, int password) throws Exception {
        PreparedStatement pstm = null;
        String sql="update smbms_user set userPassword = ? where id=?";
        Object[] params={password,id};
        int execute = BaseDao.execute(connection, sql, params, pstm);
        return execute;
    }

UserService

public boolean updatePwd( int id, int password);

UserService实现类

    @Override
    public boolean updatePwd(int id, int password) {
        Connection connection=null;
        boolean flag=false;
        try {
            connection=BaseDao.getConnection();
            if (userDao.updatePwd(connection,id,password)>0){
                flag=true;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return flag;
    }

Servlet记得实现复用，需要提取出方法

    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String method = req.getParameter("method");
        if (method!=null&&method.equals("savepwd")){
            this.updatePwd(req,resp);
        }
    }
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
    public void updatePwd(HttpServletRequest req, HttpServletResponse resp){
        //从Session里面拿ID
        User user = (User)req.getSession().getAttribute(Constansts.USER_SESSION);
        String newpassword = req.getParameter("newpassword");
        boolean flag = false;
        //判断user是否为空，newpassword是否为空
        if (user!=null&& !StringUtils.isNullOrEmpty(newpassword)){
            UserServiceImpl userService = new UserServiceImpl();
            flag=userService.updatePwd(user.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(Constansts.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);
        } catch (ServletException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

测试

优化密码修改用Ajax

阿里巴巴的fastjson

  <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.58</version>
        </dependency>

后台代码修改

public void updatePwd(HttpServletRequest req, HttpServletResponse resp){
        //从Session里面拿ID
        User user = (User)req.getSession().getAttribute(Constansts.USER_SESSION);
        String newpassword = req.getParameter("newpassword");
        boolean flag = false;
        //判断user是否为空，newpassword是否为空
        if (user!=null&& !StringUtils.isNullOrEmpty(newpassword)){
            UserServiceImpl userService = new UserServiceImpl();
            flag=userService.updatePwd(user.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(Constansts.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);
        } catch (ServletException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

测试

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

public int getUserCount(Connection connection,String username,int userRole) throws Exception;

UserDaoImpl

 @Override
    public int getUserCount(Connection connection, String username, int userRole) throws Exception {
        PreparedStatement pstm=null;
        ResultSet rs=null;
        int count = 0;
        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("add u.username like ?");
            list.add("%"+username+"%");//index:0
        }if (userRole>0){ //where trim mybatis
            sql.append("and u.userRole =?");
            list.add(userRole);//index:1
        }
        //怎么把list转化为数组
        Object[] params = list.toArray();
        rs = BaseDao.execute(connection, sql.toString(), params, rs, pstm);
        if (rs.next()){
            count=rs.getInt("count");//从结果集中获取最终的数量
        }
        return count;
    }

UserService

public int getUserCount(String username,int userRole);

UserServiceImpl

    @Override
    public int getUserCount(String username, int userRole) {
        Connection connection=null;
        int count = 0;
        try {
            connection = BaseDao.getConnection();
            count=userDao.getUserCount(connection,username,userRole);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return count;
    }

2.获取用户列表

userdao
userdaoImpl
userService
userServiceImpl

3.获取角色操作

为了我们职责统一，可以把角色的操作单独放在一个包中，和POJO类对应

roledao…与上面等同

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

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SMBMS

SMBMS

项目搭建准备工作

登录功能实现

优化登录功能

密码修改

用户管理实现

1.获取用户数量

2.获取用户列表

3.获取角色操作

4.用户显示的Servlet

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