JavaWeb-smbms项目

JavaWeb-smbms项目_第1张图片

JavaWeb-smbms项目_第2张图片

项目如何搭建?

考虑使用不使用Maven?依赖,jar

项目搭建

  1. 搭建Maven的Web项目

  2. 配置tomcat

  3. 测试项目能否跑起来

  4. 导依赖jar包

  <dependencies>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>javax.servlet.jsp-api</artifactId>
      <version>2.3.3</version>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.22</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp.jstl</groupId>
      <artifactId>jstl-api</artifactId>
      <version>1.2</version>
    </dependency>
    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>1.1.2</version>
    </dependency>
  </dependencies>
  1. 创建项目包结构
    main
    • java
      • - com.kwok- dao 持久化层
      • - filter 过滤层
      • - pojo 实体层
      • - service 业务层
      • - servlet 调用业务层
    • resources
      • db.properties 数据库配置文件
    • webapp

JavaWeb-smbms项目_第3张图片

  1. 编写实体类
    • ORM映射: 表 - 类
  1. 编写基础公共类
    • 数据库配置文件
driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/smbms?autoReconnect=true&useSSL=true&useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
username=root
password=123

JavaWeb-smbms项目_第4张图片

    • 编写数据库的公共类

JavaWeb-smbms项目_第5张图片

package com.kwok.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 {
        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");
    }

    // 获取数据库的连接
    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,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);

        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]);
        }

        resultSet = preparedStatement.executeQuery();
        return resultSet;
    }

    // 编写增删改公共方法
    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,占位符从1开始,但是我们的数组从0开始!
            preparedStatement.setObject(i+1,params[i]);
        }

        int updateRows = preparedStatement.executeUpdate();
        return updateRows;
    }

    // 关闭连接,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 throwables) {
                throwables.printStackTrace();
                flag = false;
            }
        }

        if (preparedStatement!=null){
            try {
                preparedStatement.close();
                // GC回收
                preparedStatement = null;
            } catch (SQLException throwables) {
                throwables.printStackTrace();
                flag = false;
            }
        }

        if (connection!=null){
            try {
                connection.close();
                // GC回收
                connection = null;
            } catch (SQLException throwables) {
                throwables.printStackTrace();
                flag = false;
            }
        }

        return flag;
    }
}
    • 编写字符编码过滤器
package com.kwok.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() {

    }
}
	<!--字符编码过滤器-->
    <filter>
        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class>com.kwok.filter.CharacterEncodingFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*
    
  1. 导入静态资源
    • webapp

JavaWeb-smbms项目_第6张图片

登录实现

JavaWeb-smbms项目_第7张图片

  1. 编写前端页面
  2. 设置首页
<!--设置欢迎页面-->
<welcome-file-list>
    <welcome-file>login.jsp</welcome-file>
</welcome-file-list>
  1. 编写dao层登录用户登录接口

JavaWeb-smbms项目_第8张图片

  1. 编写dao接口的实现类
package com.kwok.dao.user;

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

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

public class UserDaoIml implements UserDao {


    // 得到要登录的用户
    @Override
    public User getLoginUser(Connection connection, String userCode) throws SQLException {

        PreparedStatement pstm = null;
        ResultSet rs = null;
        User user = null;

        if (connection!=null){
            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;

    }
}
  1. 业务层接口

JavaWeb-smbms项目_第9张图片

  1. 业务层接口的实现类
package com.kwok.service.user;

import com.kwok.dao.BaseDao;
import com.kwok.dao.user.UserDao;
import com.kwok.dao.user.UserDaoIml;
import com.kwok.pojo.User;

import java.sql.Connection;
import java.sql.SQLException;

public class UserServiceImpl implements UserService {
    //业务层都会调用dao层,所以我们要引用Dao层
    private UserDao userDao;
    public UserServiceImpl(){
        userDao = new UserDaoIml();
    }

    @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 (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            BaseDao.closeResource(connection,null,null);
        }
        return user;
    }

}
  1. 编写Servlet
package com.kwok.servlet.user;

import com.kwok.pojo.User;
import com.kwok.service.user.UserServiceImpl;
import com.kwok.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 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("进入loginServlet...");

        // 获取用户名和密码
        String userCode = req.getParameter("userCode");
        String userPassword = req.getParameter("userPassword");

        // 和数据库中密码进行对比,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){
            //查有此人,可以登陆
            // 将用户的信息放到Session中
            req.getSession().setAttribute(Constants.USER_SESSION,user);
            // 跳转到内部主页
            resp.sendRedirect("jsp/frame.jsp");
        }else {
            // 查无此人,无法登陆,转发回登录页面,提示错误
            req.setAttribute("error","用户名或密码错误!");
            req.getRequestDispatcher("login.jsp").forward(req,resp);
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}
  1. 注册Servlet
	<!--Servlet-->
    <servlet>
        <servlet-name>LoginServlet</servlet-name>
        <servlet-class>com.kwok.servlet.user.LoginServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>LoginServlet</servlet-name>
        <url-pattern>/user/login.do</url-pattern>
    </servlet-mapping>
  1. 测试访问,确保以上功能成功

JavaWeb-smbms项目_第10张图片

注销功能(登录功能优化)

- 思路:移除Session,返回登录页面

LogoutServlet
package com.kwok.servlet.user;

import com.kwok.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 {
        // 移除用户的Session
        req.getSession().removeAttribute(Constants.USER_SESSION);
        resp.sendRedirect(req.getContextPath()+"/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.kwok.servlet.user.LogoutServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>LogoutServlet</servlet-name>
        <url-pattern>/jsp/logout.do</url-pattern>
    </servlet-mapping>

登录拦截优化实现

编写一个过滤器并注册

package com.kwok.filter;

import com.kwok.pojo.User;
import com.kwok.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 req, ServletResponse resp, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) resp;

        // 过滤器,从Session中获取用户
        User user = (User)request.getSession().getAttribute(Constants.USER_SESSION);
        if (user==null){
            // 已经注销了,或者未登录
            response.sendRedirect("/smbms/error.jsp");
        }else {
            filterChain.doFilter(req,resp);
        }
    }

    @Override
    public void destroy() {

    }
}
	<!--用户登录过滤器-->
    <filter>
        <filter-name>SysFilter</filter-name>
        <filter-class>com.kwok.filter.SysFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>SysFilter</filter-name>
        <url-pattern>/jsp/*
    

密码修改实现

1.导入前端页面

img

2.写项目,建议从底层往上写

JavaWeb-smbms项目_第11张图片

3.UserDao接口
// 修改当前用户密码
    public int updatePwd(Connection connection,int id,String password) throws SQLException;
4.UserDao接口实现类
// 修改当前用户密码
    @Override
    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;
    }
5.UserService层
// 根据用户id修改密码
    public boolean updatePwd(int id, String pwd);
6.UserService实现类
// 根据用户id修改密码
    @Override
    public boolean updatePwd(int id, String pwd) {
        Connection connection = null;
        boolean flag =false;
        // 修改密码
        try {
            connection = BaseDao.getConnection();
            if (userDao.updatePwd(connection,id,pwd)>0){
                flag = true;
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            BaseDao.closeResource(connection,null,null);
        }
        return flag;
    }

记得实现servlet复用,需要提取方法

package com.kwok.servlet.user;

import com.kwok.pojo.User;
import com.kwok.service.user.UserService;
import com.kwok.service.user.UserServiceImpl;
import com.kwok.util.Constants;
import com.mysql.cj.util.StringUtils;

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

// 实现servlet复用
public class UserServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String method = req.getParameter("method");
        if (method.equals("savpwd")&&method!=null){
            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;
        Object o = req.getSession().getAttribute(Constants.USER_SESSION);
        String newpassword = req.getParameter("newpassword");

        boolean flag = false;

        if (o!=null && newpassword!=null){
            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,移除当前Session
                req.getSession().removeAttribute(Constants.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();
        }
    }
}
7.注册
	<servlet>
        <servlet-name>UserServlet</servlet-name>
        <servlet-class>com.kwok.servlet.user.UserServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>UserServlet</servlet-name>
        <url-pattern>/jsp/user.do</url-pattern>
    </servlet-mapping>
8.测试

JavaWeb-smbms项目_第12张图片

Ajax验证旧密码实现

1.阿里巴巴的fastjson
<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.76</version>
</dependency>
2.后台添加代码修改方法
package com.kwok.servlet.user;

import com.alibaba.fastjson.JSONArray;
import com.kwok.pojo.User;
import com.kwok.service.user.UserService;
import com.kwok.service.user.UserServiceImpl;
import com.kwok.util.Constants;
import com.mysql.cj.util.StringUtils;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;

// 实现servlet复用
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.updatePwd(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);
    }

    // 修改密码
    public void updatePwd(HttpServletRequest req, HttpServletResponse resp){
        // 从Session里面拿ID;
        Object o = req.getSession().getAttribute(Constants.USER_SESSION);
        String newpassword = req.getParameter("newpassword");

        boolean flag = false;

        if (o!=null && newpassword!=null){
            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,移除当前Session
                req.getSession().removeAttribute(Constants.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();
        }
    }

    // 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<String,String>();

        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 writer = resp.getWriter();
            // JSONArray 阿里巴巴的JSON工具类,转换格式的
            /*
            resultMap = ["result","sessionerror","result","true"]
            转Json格式 {key:value}
            */
            writer.write(JSONArray.toJSONString(resultMap));
            writer.flush();
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
3.测试:

JavaWeb-smbms项目_第13张图片

用户管理实现

思路:
JavaWeb-smbms项目_第14张图片

1.导入分页的工具类

PageSupport类拷过来(静态资源)

JavaWeb-smbms项目_第15张图片

package com.kwok.util;

public class PageSupport {
	//当前页码-来自于用户输入
	private int currentPageNo = 1;
	
	//总数量(表)
	private int totalCount = 0;
	
	//页面容量
	private int pageSize = 0;
	
	//总页数-totalCount/pageSize(+1)
	private int totalPageCount = 1;

	public int getCurrentPageNo() {
		return currentPageNo;
	}

	public void setCurrentPageNo(int currentPageNo) {
		if(currentPageNo > 0){
			this.currentPageNo = currentPageNo;
		}
	}

	public int getTotalCount() {
		return totalCount;
	}

	public void setTotalCount(int totalCount) {
		if(totalCount > 0){
			this.totalCount = totalCount;
			//设置总页数
			this.setTotalPageCountByRs();
		}
	}
	public int getPageSize() {
		return pageSize;
	}

	public void setPageSize(int pageSize) {
		if(pageSize > 0){
			this.pageSize = pageSize;
		}
	}

	public int getTotalPageCount() {
		return totalPageCount;
	}

	public void setTotalPageCount(int totalPageCount) {
		this.totalPageCount = totalPageCount;
	}
	
	public void setTotalPageCountByRs(){
		if(this.totalCount % this.pageSize == 0){
			this.totalPageCount = this.totalCount / this.pageSize;
		}else if(this.totalCount % this.pageSize > 0){
			this.totalPageCount = this.totalCount / this.pageSize + 1;
		}else{
			this.totalPageCount = 0;
		}
	}
	
}

2.用户列表页面导入

JavaWeb-smbms项目_第16张图片

    • userlist.jsp
    • rollpage.jsp

3.用户展示实现

1.获取用户数量
  • UserDao
// 根据用户名或角色查询用户总数
    public int getUserCount(Connection connection,String username,int userRole) throws SQLException;
  • UserDaoImpl
// 根据用户名或角色查询用户总数[最难理解的SQL]
    @Override
    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<Object>();// 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("UserDaoIml->getUserCount"+sql.toString()); // 输出完整的sql语句

            rs = BaseDao.execute(connection, pstm, rs, sql.toString(), params);

            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
// 查询用户总数
    public int getUserCount(String username,int userRole);
  • UserServiceImpl
// 查询用户总数
    @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 (SQLException throwables) {
            throwables.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
// 通过条件查询-userlist
    @Override
    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
// 根据条件查询用户列表
    @Override
    public List<User> getUserList(String queryUserName, int queryUserRole, int currentPageNo, int pageSize) {
        Connection connection = null;
        List<User> userList = null;
        try {
            connection = BaseDao.getConnection();
            userDao.getUserList(connection,queryUserName,queryUserRole,currentPageNo,pageSize);
        } catch (Exception throwables) {
            throwables.printStackTrace();
        }finally {
            BaseDao.closeResource(connection,null,null);
        }
        return userList;
    }
3.获取角色操作

为了职责统一,可以把角色的操作单独放在一个包中,并和POJO类进行对应。

  • RoleDao
package com.kwok.dao.role;

import com.kwok.pojo.Role;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;

public interface RoleDao {
    // 获取角色列表
    public List<Role> getRoleList(Connection connection) throws SQLException;
}
  • RoleDaoImpl
package com.kwok.dao.role;

import com.kwok.dao.BaseDao;
import com.kwok.pojo.Role;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

public class RoleDaoImpl implements RoleDao {
    // 获取角色列表
    @Override
    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;
    }
}
  • RoleService
package com.kwok.service.role;

import com.kwok.pojo.Role;

import java.util.List;

public interface RoleService {
    // 根据条件角色列表
    public List<Role> getRoleList();
}
  • RoleServiceImpl
package com.kwok.service.role;

import com.kwok.dao.BaseDao;
import com.kwok.dao.role.RoleDao;
import com.kwok.dao.role.RoleDaoImpl;
import com.kwok.pojo.Role;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;

public class RoleServiceImpl implements RoleService {

    // 引入Dao
    private RoleDao roleDao;

    public RoleServiceImpl(){
        roleDao = new RoleDaoImpl();
    }

    // 根据条件角色列表
    @Override
    public List<Role> getRoleList() {
        Connection connection = null;
        List<Role> roleList = null;
        try {
            connection = BaseDao.getConnection();
            roleList = roleDao.getRoleList(connection);
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            BaseDao.closeResource(connection,null,null);
        }
        return roleList;
    }
}
4.用户显示的Servlet

添加query方法:

    • 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
    • 返回前端
// (重点,难点)获取用户列表
    public void query(HttpServletRequest req, HttpServletResponse resp){
        // 查询用户列表

        // 从前端获取数据
        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; // 可以把这个写在配置文件中,方便后期修改
        int currentPageNo = 1;

        if (queryUserName == null){
            queryUserName = "";
        }
        if (temp!=null && !temp.equals("")){
            queryUserRole = Integer.parseInt(temp); // 给查询赋个值
        }
        if (pageIndex!=null){
            currentPageNo = Integer.parseInt(pageIndex);
        }

        // 获取用户的总数(分页:上一页,下一页的情况)
        int totalCount = userService.getUserCount(queryUserName, queryUserRole);
        // 总页数支持
        PageSupport pageSupport = new PageSupport();
        pageSupport.setCurrentPageNo(currentPageNo);
        pageSupport.setPageSize(pageSize);
        pageSupport.setTotalCount(totalCount);

        int totalPageCount = ((int)(totalCount/pageSize))+1; // 总共有几页

        // 控制首页和尾页
        // 如果页面小于1了,就显示第一页数据
        if (totalPageCount<1){
            currentPageNo = 1;
        }else if (currentPageNo>totalPageCount){
            // 当前页面大于最后一页
            currentPageNo = totalPageCount;
        }

        // 获取用户列表展示
        userList = userService.getUserList(queryUserName, queryUserRole, currentPageNo, pageSize);
        req.setAttribute("userList",userList);

        // 获取角色列表展示
        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();
        }

    }
小黄鸭调试法:
    程序员修炼之道
    和小黄鸭边说边分析(物体)
5.测试结果

JavaWeb-smbms项目_第17张图片

JavaWeb-smbms项目_第18张图片

JavaWeb-smbms项目_第19张图片

JavaWeb-smbms项目_第20张图片

4.增加用户实现

JavaWeb-smbms项目_第21张图片

UserDao
// 新增用户信息
    public int add(Connection connection,User user) throws Exception;
UserDaoImpl
// 新增用户信息
    @Override
    public int add(Connection connection, User user) throws Exception {
        PreparedStatement pstm = null;
        int updateRows = 0;
        if (null != connection){
            String sql = "insert into smbms_user (userCode,userName,userPassword," +
                    "userRole,gender,birthday,phone,address,creationDate,createdBy)" +
                    " values (?,?,?,?,?,?,?,?,?,?)";
            Object[] params = {user.getUserCode(),user.getUserName(),user.getUserPassword(),
                    user.getUserRole(),user.getGender(),user.getBirthday(),
                    user.getPhone(),user.getAddress(),user.getCreationDate(),user.getCreatedBy()};
            updateRows = BaseDao.execute(connection,pstm,sql,params);
            BaseDao.closeResource(null,pstm,null);
        }
        return updateRows;
    }
UserService
// 新增用户信息
    public boolean add(User user);
UserServiceImpl
// 新增用户信息
    @Override
    public boolean add(User user) {
        Boolean flag = false;
        Connection connection = null;
        try {
            connection = BaseDao.getConnection();
            connection.setAutoCommit(false); // 开启JDBC事务管理
            int updateRows = userDao.add(connection,user);
            connection.commit();
            if (updateRows > 0){
                flag = true;
                System.out.println("add success");
            }else {
                System.out.println("add faild");
            }
        } catch (Exception throwables) {
            throwables.printStackTrace();
            try {
                connection.rollback();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }finally {
            // 在service层进行connection的关闭
            BaseDao.closeResource(connection,null,null);
        }
        return flag;
    }
UserServlet
// 新增用户
    public void adduser(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
        System.out.println("新增用户");
        String userCode = req.getParameter("userCode");
        String userName = req.getParameter("userName");
        String userPassword = req.getParameter("userPassword");
        String gender = req.getParameter("gender");
        String birthday = req.getParameter("birthday");
        String phone = req.getParameter("phone");
        String address = req.getParameter("address");
        String userRole = req.getParameter("userRole");

        User user = new User();
        user.setUserCode(userCode);
        user.setUserName(userName);
        user.setUserPassword(userPassword);
        user.setAddress(address);
        try {
            user.setBirthday(new SimpleDateFormat("yyyy-MM-dd").parse(birthday));
        } catch (ParseException e) {
            e.printStackTrace();
        }
        user.setGender(Integer.valueOf(gender));
        user.setPhone(phone);
        user.setUserRole(Integer.valueOf(userRole));
        user.setCreationDate(new Date());
        user.setCreatedBy(((User)req.getSession().getAttribute(Constants.USER_SESSION)).getId());
        System.out.println(((User)req.getSession().getAttribute(Constants.USER_SESSION)).getId());

        UserServiceImpl userService = new UserServiceImpl();
        if (userService.add(user)){
            resp.sendRedirect(req.getContextPath()+"/jsp/user.do?method=query");
        }else {
            req.getRequestDispatcher("useradd.jsp").forward(req,resp);
        }
    }
测试结果

JavaWeb-smbms项目_第22张图片

5.删除用户实现

UserDao
// 删除用户信息
    public int deleteUserById(Connection connection,int delId) throws Exception;
UserDaoImpl
// 删除用户信息
    @Override
    public int deleteUserById(Connection connection, int delId) throws Exception {
        PreparedStatement pstm = null;
        int updateRows = 0;
        List<Object> list = new ArrayList<Object>();
        if (null != connection){
            String sql = "delete from smbms_user where id=?";
            list.add(delId);
            Object[] params = list.toArray();
            System.out.println("sql->"+sql.toString());
            updateRows = BaseDao.execute(connection,pstm,sql,params);
            BaseDao.closeResource(null,pstm,null);
        }
        return updateRows;
    }
UserService
// 删除用户信息
    public boolean deleteUserById(Integer delId);
UserServiceImpl
// 删除用户信息
    @Override
    public boolean deleteUserById(Integer delId) {
        Connection connection = null;
        boolean flag = false;
        try {
            connection = BaseDao.getConnection();
            if (userDao.deleteUserById(connection,delId) > 0){
                flag = true;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            BaseDao.closeResource(connection,null,null);
        }
        return flag;
    }
UserServlet
// 删除用户
    public void deluser(HttpServletRequest req, HttpServletResponse resp) throws IOException {
        System.out.println("删除用户");
        String id = req.getParameter("uid");
        Integer delId = 0;
        try {
            delId = Integer.parseInt(id);
        }catch (Exception e){
            delId = 0;
        }
        HashMap<String, String> resultMap = new HashMap<String, String>();
        if (delId <= 0){
            resultMap.put("delResult","notexist");
        }else {
            UserServiceImpl userService = new UserServiceImpl();
            if (userService.deleteUserById(delId)){
                resultMap.put("delResult","true");
            }else {
                resultMap.put("delResult","false");
            }
        }

        // 把resultMap转换为json对象输出
        resp.setContentType("application/json");
        PrintWriter outPrinterWriter = resp.getWriter();
        outPrinterWriter.write(JSONArray.toJSONString(resultMap));
        outPrinterWriter.flush();
        outPrinterWriter.close();

    }
测试结果

JavaWeb-smbms项目_第23张图片

6.修改用户实现

UserDao
// 通过userId获得user
    public User getUserById(Connection connection,String id) throws Exception;

    // 修改用户信息
    public int modify(Connection connection,User user,String id) throws Exception;
UserDaoImpl
// 通过userId获得user
    @Override
    public User getUserById(Connection connection, String id) throws Exception {
        User user = null;
        PreparedStatement pstm = null;
        ResultSet rs = null;
        if (null != connection){
            String sql = "select u.*,r.roleName as userRoleName from smbms_user u,smbms_role r where u.id=? and u.userRole = r.id";
            Object[] params = {id};
            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"));
                user.setUserRoleName(rs.getString("userRoleName"));
            }
            BaseDao.closeResource(null,pstm,rs);
        }
        return user;
    }

    // 修改用户信息
    @Override
    public int modify(Connection connection, User user,String id) throws Exception {
        PreparedStatement pstm = null;
        int updateRows = 0;
        if (null != connection){
            String sql = "update smbms_user set userName=?,gender=?,birthday=?,phone=?,address=?,userRole=?,modifyBy=?,modifyDate=? where id=?";
            Object[] params = {user.getUserName(),user.getGender(),user.getBirthday(),
                    user.getPhone(),user.getAddress(),user.getUserRole(),user.getModifyBy(),user.getModifyDate(),id};
            updateRows = BaseDao.execute(connection,pstm,sql,params);
            BaseDao.closeResource(null,pstm,null);
        }
        return updateRows;
    }
UserService
// 通过userId获得user
    public User getUserById(String id);

    // 修改用户信息
    public boolean modify(User user,String id);
UserServiceImpl
// 通过userId获得user
    @Override
    public User getUserById(String id) {
        User user = null;
        Connection connection = null;
        try {
            connection = BaseDao.getConnection();
            user = userDao.getUserById(connection,id);
        } catch (Exception e) {
            e.printStackTrace();
            user = null;
        }finally {
            BaseDao.closeResource(connection,null,null);
        }
        return user;
    }

    // 修改用户信息
    @Override
    public boolean modify(User user,String id) {
        Boolean flag = false;
        Connection connection = null;
        try {
            connection = BaseDao.getConnection();
            connection.setAutoCommit(false); // 开启JDBC事务管理
            int updateRows = userDao.modify(connection,user,id);
            connection.commit();
            if (updateRows > 0){
                flag = true;
                System.out.println("modify success");
            }else {
                System.out.println("modify faild");
            }
        } catch (Exception throwables) {
            throwables.printStackTrace();
            try {
                connection.rollback();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }finally {
            // 在service层进行connection的关闭
            BaseDao.closeResource(connection,null,null);
        }
        return flag;
    }
UserServlet
// 根据id获取用户信息
    public void getUserById(HttpServletRequest req, HttpServletResponse resp,String url) throws ServletException, IOException {
        String id = req.getParameter("uid");
        if (!StringUtils.isNullOrEmpty(id)){
            // 调用后台方法得到user对象
            UserService userService = new UserServiceImpl();
            User user = userService.getUserById(id);
            req.setAttribute("user",user);
            req.getRequestDispatcher(url).forward(req,resp);
        }
    }

    // 修改用户信息
    public void modify(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
        String id = req.getParameter("uid");
        String userName = req.getParameter("userName");
        String gender = req.getParameter("gender");
        String birthday = req.getParameter("birthday");
        String phone = req.getParameter("phone");
        String address = req.getParameter("address");
        String userRole = req.getParameter("userRole");

        User user = new User();
        user.setUserName(userName);
        user.setGender(Integer.valueOf(gender));
        try {
            user.setBirthday(new SimpleDateFormat("yyyy-MM-dd").parse(birthday));
        } catch (ParseException e) {
            e.printStackTrace();
        }
        user.setPhone(phone);
        user.setAddress(address);
        user.setUserRole(Integer.valueOf(userRole));
        user.setModifyDate(new Date());
        user.setModifyBy(((User)req.getSession().getAttribute(Constants.USER_SESSION)).getId());

        UserServiceImpl userService = new UserServiceImpl();
        if (userService.modify(user,id)){
            resp.sendRedirect(req.getContextPath()+"/jsp/user.do?method=query");
        }else {
            req.getRequestDispatcher("usermodify.jsp").forward(req,resp);
        }
    }

7.查看用户实现

UserServlet
// 查看用户信息
    public void userview(HttpServletRequest req, HttpServletResponse resp,String url) throws ServletException, IOException {
        System.out.println("查看用户信息");
        String id = req.getParameter("uid");
        if (!StringUtils.isNullOrEmpty(id)){
            // 调用后台方法得到user对象
            UserService userService = new UserServiceImpl();
            User user = userService.getUserById(id);
            req.setAttribute("user",user);
            req.getRequestDispatcher(url).forward(req,resp);
        }
    }

项目所有代码:

https://gitee.com/mr-kwok/smbms

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