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基于javaweb+jsp的学生请假管理系统

晴儿成长记 2022-03-26 阅读 97
java-eejavamysqltomcat

JavaWeb JavaBean JSP MVC MySQL Tomcat JavaScript Bootstrap.

基础JSP+Servlet或JSP+SSM(Spring、SpringMVC、MyBatis)框架或JSP+SSM+Maven(pom.xml)框架或SpringBoot…均可

开发工具：eclipse/idea/myeclipse/sts等均可配置运行

适用

课程设计，大作业，毕业设计，项目练习，学习演示等

        //totalPage 总页数
        if (totalRecord % pageSize == 0) {
            //说明整除，正好每页显示pageSize条数据，没有多余一页要显示少于pageSize条数据的
            this.totalPage = totalRecord / pageSize;
        } else {
            //不整除，就要在加一页，来显示多余的数据。
            this.totalPage = totalRecord / pageSize + 1;
        }
        //开始索引
        this.startIndex = (pageNum - 1) * pageSize;
        //显示5页，这里自己可以设置，想显示几页就自己通过下面算法修改
        this.start = 1;
        this.end = 5;
        //显示页数的算法
        if (totalPage <= 5) {
            //总页数都小于5，那么end就为总页数的值了。
            this.end = this.totalPage;
        } else {
            //总页数大于5，那么就要根据当前是第几页，来判断start和end为多少了，
            this.start = pageNum - 2;
            this.end = pageNum + 2;

                vo.setLeaveStart(rs.getString("leave_start"));
                vo.setLeaveHour(rs.getString("leave_hour"));
            }
            c.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return vo;
    }

    //@Override
    public Map<String, Object> list(Map<String, Object> params) {
        List<Leave> list = new ArrayList();
        int totalCount = 0;
        String condition = "";

import com.demo.util.Util;
import com.demo.vo.User;

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;

//@WebServlet("/AuthServlet")
public class AuthServlet extends HttpServlet {

            this.redirectList(request, response);
        } else if ("edit".equals(action)) {//修改
            //取出页面传进来的各个数据，并设置到User对象的属性里
            User vo = new User();
            vo.setId(Long.valueOf(Util.decode(request, "id")));
            vo.setUsername(Util.decode(request, "username"));
            vo.setPassword(Util.decode(request, "password"));
            vo.setRealName(Util.decode(request, "realName"));
            vo.setUserSex(Util.decode(request, "userSex"));
            vo.setUserPhone(Util.decode(request, "userPhone"));
            vo.setUserText(Util.decode(request, "userText"));
            vo.setUserType(Util.decode(request, "userType"));

package com.demo.servlet;

import com.demo.util.Util;
import com.demo.service.UserService;
import com.demo.service.impl.UserServiceImpl;
import com.demo.vo.User;
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.Serializable;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

        <tr class="index-content-table-th">
            <th>用户名</th>
            <th>姓名</th>
            <th>性别</th>
            <th>手机</th>
            <th>备注</th>
            <th>类型</th>
            <th>操作</th>
        </tr>
        </thead>
        <tbody>
        <c:forEach items="${list}" var="vo">

        int totalCount = 0;
        String condition = "";
        String sqlList;
        if (params.get("searchColumn") != null && !"".equals(params.get("searchColumn"))) {
            condition += " and `" + params.get("searchColumn") + "` like '%" + params.get("keyword") + "%'";
        }
        try {
            Connection c = Util.getConnection();
            PreparedStatement ps;
            ResultSet rs;
            String limit = (params.get("startIndex") != null && params.get("pageSize") != null) ? " limit " + params.get("startIndex") + "," + params.get("pageSize") : "";
                sqlList = "select * from `t_leave` where 1=1 " + condition + " order by id asc " + limit + ";";
                ps = c.prepareStatement(sqlList);
                rs = ps.executeQuery();
                while (rs.next()) {
                    Leave vo = new Leave();
                    vo.setId(rs.getLong("id"));
                    vo.setLeaveName(rs.getString("leave_name"));
                    vo.setLeaveSex(rs.getString("leave_sex"));
                    vo.setLeavePhone(rs.getString("leave_phone"));
                    vo.setLeaveClass(rs.getString("leave_class"));

        this.keyword = keyword;
    }
}
package com.demo.util;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;


            for (User user : list) {
                if (user.getUsername().equals(username) /*&& user.getPassword().equals(password)*/) {//说明该用户名已存在，必须换个用户名才能注册
                    request.getSession().setAttribute("alert_msg", "错误：用户名已存在！");
                    request.getRequestDispatcher("register.jsp").forward(request, response);
                    return;
                }
            }
            User vo = new User();
            vo.setUsername(username);
            vo.setPassword(password);
            //vo.setUserType("普通用户");//需要设置一个默认值

            Serializable id = Util.decode(request, "id");//取出页面传入的主键，用于查询详情
            UserService userService = new UserServiceImpl();
            User vo = userService.get(id);
            request.getSession().setAttribute("vo", vo);
            String to = "get".equalsIgnoreCase(action) ? "info" : "edit";//判断是去详情显示页面还是编辑页面
            response.sendRedirect("user_" + to + ".jsp");
        } else {//默认去列表页面
            this.redirectList(request, response);
        }
    }

    /**
     * 处理Get请求
     *
     * @param request
     * @param response
     * @throws ServletException

            long id = Long.parseLong(Util.decode(request, "id"));
            LeaveService leaveService = new LeaveServiceImpl();
            //调用Service层删除方法（delete），将对应的记录删除
            leaveService.delete(id);
            this.redirectList(request, response);
        } else if ("edit".equals(action)) {//修改
            //取出页面传进来的各个数据，并设置到Leave对象的属性里
            Leave vo = new Leave();
            vo.setId(Long.valueOf(Util.decode(request, "id")));
            vo.setLeaveName(Util.decode(request, "leaveName"));
            vo.setLeaveSex(Util.decode(request, "leaveSex"));
            vo.setLeavePhone(Util.decode(request, "leavePhone"));
            vo.setLeaveClass(Util.decode(request, "leaveClass"));
            vo.setLeaveReason(Util.decode(request, "leaveReason"));
            vo.setLeaveStart(Util.decode(request, "leaveStart"));
            vo.setLeaveHour(Util.decode(request, "leaveHour"));
            LeaveService leaveService = new LeaveServiceImpl();
            //调用Service层更新方法（update），更新记录
            leaveService.update(vo);
            this.redirectList(request, response);
        } else if ("get".equalsIgnoreCase(action) || "editPre".equalsIgnoreCase(action)) {//根据主键ID，查询详情信息并跳转到详情页面或编辑页面
            Serializable id = Util.decode(request, "id");//取出页面传入的主键，用于查询详情
            LeaveService leaveService = new LeaveServiceImpl();

        if (params.get("searchColumn") != null && !"".equals(params.get("searchColumn"))) {
            condition += " and `" + params.get("searchColumn") + "` like '%" + params.get("keyword") + "%'";
        }
        try {
            Connection c = Util.getConnection();
            PreparedStatement ps;
            ResultSet rs;
            String limit = (params.get("startIndex") != null && params.get("pageSize") != null) ? " limit " + params.get("startIndex") + "," + params.get("pageSize") : "";
                sqlList = "select * from `t_leave` where 1=1 " + condition + " order by id asc " + limit + ";";
                ps = c.prepareStatement(sqlList);
                rs = ps.executeQuery();
                while (rs.next()) {
                    Leave vo = new Leave();
                    vo.setId(rs.getLong("id"));
                    vo.setLeaveName(rs.getString("leave_name"));
                    vo.setLeaveSex(rs.getString("leave_sex"));
                    vo.setLeavePhone(rs.getString("leave_phone"));
                    vo.setLeaveClass(rs.getString("leave_class"));
                    vo.setLeaveReason(rs.getString("leave_reason"));

            Leave vo = new Leave();
            //取出页面传进来的各个数据，并设置到Leave对象的属性里
            vo.setLeaveName(Util.decode(request, "leaveName"));
            vo.setLeaveSex(Util.decode(request, "leaveSex"));
            vo.setLeavePhone(Util.decode(request, "leavePhone"));
            vo.setLeaveClass(Util.decode(request, "leaveClass"));
            vo.setLeaveReason(Util.decode(request, "leaveReason"));
            vo.setLeaveStart(Util.decode(request, "leaveStart"));
            vo.setLeaveHour(Util.decode(request, "leaveHour"));
            LeaveService leaveService = new LeaveServiceImpl();
            //调用Service层增加方法（add），增加记录
            leaveService.add(vo);
            this.redirectList(request, response);
        } else if ("delete".equals(action)) {//删除
            //取出表要删除的请假记录的主键
            long id = Long.parseLong(Util.decode(request, "id"));
            LeaveService leaveService = new LeaveServiceImpl();
            //调用Service层删除方法（delete），将对应的记录删除
            leaveService.delete(id);
            this.redirectList(request, response);
        } else if ("edit".equals(action)) {//修改

            String codeChars = "0123456789";// 图形验证码的字符集合，系统将随机从这个字符串中选择一些字符作为验证码
            //  获得验证码集合的长度
            int charsLength = codeChars.length();
            //  下面三条记录是关闭客户端浏览器的缓冲区
            //  这三条语句都可以关闭浏览器的缓冲区，但是由于浏览器的版本不同，对这三条语句的支持也不同
            //  因此，为了保险起见，建议同时使用这三条语句来关闭浏览器的缓冲区
            response.setHeader("ragma", "No-cache");
            response.setHeader("Cache-Control", "no-cache");
            response.setDateHeader("Expires", 0);
            //  设置图形验证码的长和宽（图形的大小）
            int width = 90, height = 20;
            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics g = image.getGraphics();//  获得用于输出文字的Graphics对象
            Random random = new Random();
            g.setColor(getRandomColor(180, 250));// 随机设置要填充的颜色
            g.fillRect(0, 0, width, height);//  填充图形背景
            //  设置初始字体

            return false;
        }
        if (document.getElementById("password").value.trim().length == 0) {
            alert("密码不能为空!");
            return false;
        }
        if (document.getElementById("realName").value.trim().length == 0) {
            alert("姓名不能为空!");
            return false;
        }

                String newPassword = Util.decode(request, "newPassword");
                loginUser.setPassword(newPassword);
                UserService userService = new UserServiceImpl();
                userService.update(loginUser);
                msg = "修改成功！";
            }
            request.getSession().setAttribute("alert_msg", msg);
            request.getRequestDispatcher("reset_password.jsp").forward(request, response);
        } else {
            response.sendRedirect("login.jsp");
        }
    }

    /**

            PreparedStatement ps = c.prepareStatement(sql);
            
            ps.setString(1, vo.getLeaveName());
            ps.setString(2, vo.getLeaveSex());
            ps.setString(3, vo.getLeavePhone());
            ps.setString(4, vo.getLeaveClass());
            ps.setString(5, vo.getLeaveReason());
            ps.setString(6, vo.getLeaveStart());
            ps.setString(7, vo.getLeaveHour());
            ps.execute();
            ps.close();
            c.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    //@Override

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);//Get请求和Post请求的处理是一样的，所以把request、response转交给Post方法就好
    }

    /**
     * 根据参数，查询出条例条件的记录集合，最后将数据返回给调用处或者将数据集合设置到session域里，再跳转到对应的列表页面
     *
     * @param request
     * @param response
     */
    private void redirectList(HttpServletRequest request, HttpServletResponse response) throws IOException {
        //查询列和关键字
        String searchColumn = Util.decode(request, "searchColumn");
        String keyword = Util.decode(request, "keyword");
        Map<String, Object> params = new HashMap();//用来保存控制层传进来的参数(查询条件)
        params.put("searchColumn", searchColumn);//要查询的列
        params.put("keyword", keyword);//查询的关键字
        LeaveService leaveService = new LeaveServiceImpl();
        Map<String, Object> map = leaveService.list(params);
        request.getSession().setAttribute("list", map.get("list"));

        Integer totalRecord = (Integer) map.get("totalCount");//根据查询条件取出对应的总记录数，用于分页

            return false;
        }
        if (document.getElementById("leaveReason").value.trim().length == 0) {
            alert("请假原因不能为空!");
            return false;
        }
        if (document.getElementById("leaveStart").value.trim().length == 0) {
            alert("开始时间不能为空!");
            return false;
        }
        if (document.getElementById("leaveHour").value.trim().length == 0) {
            alert("请假时长(h)不能为空!");
            return false;
        }
        return true;

            char c = ch[i];
            if (!Character.isLetterOrDigit(c)) {
                if (!isChinese(c)) {
                    count = count + 1;
                }
                chLength++;
            }
        }
        return count / chLength > 0.4;
    }

        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    //@Override
    public Leave get(Serializable id) {
        Leave vo = null;
        try {
            Connection c = Util.getConnection();
            Statement s = c.createStatement();
            String sql = "select * from `t_leave` where id = " + id;
            ResultSet rs = s.executeQuery(sql);
            if (rs.next()) {
                vo = new Leave();
                vo.setId(rs.getLong("id"));
                vo.setLeaveName(rs.getString("leave_name"));
                vo.setLeaveSex(rs.getString("leave_sex"));

        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        String action = Util.decode(request, "action");
        if ("add".equals(action)) {//增加
            Notice vo = new Notice();
            //取出页面传进来的各个数据，并设置到Notice对象的属性里
            vo.setNoticeName(Util.decode(request, "noticeName"));
            vo.setNoticeText(Util.decode(request, "noticeText"));
            vo.setNoticeType(Util.decode(request, "noticeType"));
            vo.setCreateDate(Util.decode(request, "createDate"));
            NoticeService noticeService = new NoticeServiceImpl();
            //调用Service层增加方法（add），增加记录
            noticeService.add(vo);
            this.redirectList(request, response);
        } else if ("delete".equals(action)) {//删除
            //取出表要删除的公告记录的主键
            long id = Long.parseLong(Util.decode(request, "id"));

                    <c:when test="${fn:length(vo.userText) > 19}">
                        <c:out value="${fn:substring(vo.userText, 0, 19)}..."/>
                    </c:when>
                    <c:otherwise>
                        <c:out value="${vo.userText}"/>
                    </c:otherwise>
                </c:choose>
                </td>
                <td>${vo.userType}</td>
                <td>
                    <button class="btn btn-pill btn-info btn-sm" style="padding: 0px 1px;" onclick="window.location.href='UserServlet?action=get&id=${vo.id}'">详情</button>&nbsp;
                    <button class="btn btn-pill btn-warning btn-sm" style="padding: 0px 1px;"
                            <c:if test="${loginUser.userType != '管理员' && vo.id != loginUser.id}">disabled="disabled" title="没有权限！！！"</c:if>
                    οnclick="window.location.href='UserServlet?action=editPre&id=${vo.id}'">编辑</button>&nbsp;
                    <button class="btn btn-pill btn-warning btn-sm" style="padding: 0px 1px;" <c:if test="${loginUser.userType != '管理员'}">disabled="disabled" title="没有权限！！！"</c:if> οnclick="if(window.confirm('将要删除：${vo.realName}？'))window.location.href='UserServlet?action=delete&id=${vo.id}'">删除</button>
                </td>
            </tr>
        </c:forEach>
        </tbody>
    </table>
    <div style="float: right;padding-right: 10px;color: #515151;"><jsp:include page="split.jsp"/></div>
</div>

        }
        if (document.getElementById("realName").value.trim().length == 0) {
            alert("姓名不能为空!");
            return false;
        }
        if (document.getElementById("userPhone").value.trim().length == 0) {
            alert("手机不能为空!");
            return false;
        }
        return true;
    }
</script>
</html>
<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<!DOCTYPE html>
<html>
<head>

import java.io.OutputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;

//@WebServlet("/AuthServlet")
public class AuthServlet extends HttpServlet {
    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //过滤编码
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        String action = Util.decode(request, "action");
        if ("login".equalsIgnoreCase(action)) {//登录
            String username = Util.decode(request, "username");
            String password = Util.decode(request, "password");

            String validationCode = Util.decode(request, "validationCode");
            if (validationCode != null && !validationCode.equals(request.getSession().getAttribute("validationCode"))) {//验证码不通过
                request.getSession().setAttribute("alert_msg", "错误：验证码不正确！");
                request.getRequestDispatcher("login.jsp").forward(request, response);

            ps.setString(7, vo.getLeaveHour());
            ps.execute();
            ps.close();
            c.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    //@Override
    public void update(Leave vo) {
        String sql = "update `t_leave` set `leave_name` = ? ,`leave_sex` = ? ,`leave_phone` = ? ,`leave_class` = ? ,`leave_reason` = ? ,`leave_start` = ? ,`leave_hour` = ?  where `id` = ?";
        try {
            Connection c = Util.getConnection();
            PreparedStatement ps = c.prepareStatement(sql);
            
            ps.setString(1, vo.getLeaveName());
            ps.setString(2, vo.getLeaveSex());
            ps.setString(3, vo.getLeavePhone());
            ps.setString(4, vo.getLeaveClass());
            ps.setString(5, vo.getLeaveReason());
            ps.setString(6, vo.getLeaveStart());
            ps.setString(7, vo.getLeaveHour());
            ps.setLong(8, vo.getId());

    private String keyword;//待模糊查询的关键字

    //通过pageNum，pageSize，totalRecord计算得来tatalPage和startIndex，构造方法中将pageNum，pageSize，totalRecord获得
    public PageBean(int pageNum, int totalRecord) {
        this.pageNum = (pageNum = Math.max(pageNum, 1));
        this.pageSize = 10;//默认为10
        this.totalRecord = totalRecord;
        //totalPage 总页数
        if (totalRecord % pageSize == 0) {
            //说明整除，正好每页显示pageSize条数据，没有多余一页要显示少于pageSize条数据的
            this.totalPage = totalRecord / pageSize;
        } else {
            //不整除，就要在加一页，来显示多余的数据。
            this.totalPage = totalRecord / pageSize + 1;
        }
        //开始索引
        this.startIndex = (pageNum - 1) * pageSize;

运行环境

Java≥6、Tomcat≥7.0、MySQL≥5.5

开发工具

eclipse/idea/myeclipse/sts等均可配置运行

技术框架

JavaWeb JavaBean JSP MVC MySQL Tomcat JavaScript Bootstrap.

基础JSP+Servlet或JSP+SSM(Spring、SpringMVC、MyBatis)框架或JSP+SSM+Maven(pom.xml)框架或SpringBoot…均可

适用

课程设计，大作业，毕业设计，项目练习，学习演示等

功能说明

登录、注册、退出、用户模块、公告模块、请假模块的增删改查管理

20220319002252

20220319002253

20220319002254

20220319002255

20220319002256

20220319002257

20220319002258

document

↖[获取源码方式]见左侧

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