基于javaweb+mysql的jsp+servlet学生请假管理系统(JavaWeb MySQL JSP Bootstrap Servlet SSM SpringBoot)

运行环境

Java≥8、MySQL≥5.7、Tomcat≥8

开发工具

eclipse/idea/myeclipse/sts等均可配置运行

技术框架

JavaBean MVC JSP Servlet MySQL CSS JavaScript Bootstrap.

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

eclipse/MyEclipse运行：

idea运行：

    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 = request.getParameter("searchColumn");
        String keyword = request.getParameter("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
        UserService userService = new UserServiceImpl();
        Map<String, Object> map = userService.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
        String pageNum = request.getParameter("pageNum");//封装分页参数
        com.demo.util.PageBean<Object> pb = new com.demo.util.PageBean(Integer.valueOf(pageNum != null ? pageNum : "1"), totalRecord);
        params.put("startIndex", pb.getStartIndex());
        params.put("pageSize", pb.getPageSize());
        List list = (List) userService.list(params).get("list");//根据分页参数startIndex、pageSize查询出来的最终结果list
        pb.setServlet("UserServlet");
        pb.setSearchColumn(searchColumn);
        pb.setKeyword(keyword);
        pb.setList(list);
        request.getSession().setAttribute("pageBean", pb);
        request.getSession().setAttribute("list", pb.getList());

        response.sendRedirect("user_list.jsp");
    }
}

        Random random = new Random();
        // 保存minColor最大不会超过255
        if (minColor > 255)
            minColor = 255;
        //  保存minColor最大不会超过255
        if (maxColor > 255)
            maxColor = 255;
        //  获得红色的随机颜色值
        int red = minColor + random.nextInt(maxColor - minColor);
        //  获得绿色的随机颜色值
        int green = minColor + random.nextInt(maxColor - minColor);
        //  获得蓝色的随机颜色值
        int blue = minColor + random.nextInt(maxColor - minColor);
        return new Color(red, green, blue);
    }
}

/**
 * 请假模块的Servlet控制层，负责接收页面传过来的请求参数，根据action参数的值来确定页面要执行的具体操作<br>
 * 而后再调用LeaveService业务层的方法来处理具体的业务，最后将处理完成的结果返回或跳转至相应页面
 */
//@WebServlet("/LeaveServlet")
public class LeaveServlet extends HttpServlet {

    /**
     * 处理Post请求
     *
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */

     * @throws IOException
     */
    @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 = request.getParameter("searchColumn");
        String keyword = request.getParameter("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
        NoticeService noticeService = new NoticeServiceImpl();
        Map<String, Object> map = noticeService.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
        String pageNum = request.getParameter("pageNum");//封装分页参数
        com.demo.util.PageBean<Object> pb = new com.demo.util.PageBean(Integer.valueOf(pageNum != null ? pageNum : "1"), totalRecord);
        params.put("startIndex", pb.getStartIndex());
        params.put("pageSize", pb.getPageSize());
        List list = (List) noticeService.list(params).get("list");//根据分页参数startIndex、pageSize查询出来的最终结果list
        pb.setServlet("NoticeServlet");
        pb.setSearchColumn(searchColumn);
        pb.setKeyword(keyword);
        pb.setList(list);
        request.getSession().setAttribute("pageBean", pb);
        request.getSession().setAttribute("list", pb.getList());

        response.sendRedirect("notice_list.jsp");
    }
}

/**
 * 这是过滤器
 * 主要负责过滤编码为utf-8及登录拦截，禁止未登录就访问

            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(request.getParameter("id")));
            vo.setLeaveName(request.getParameter("leaveName"));
            vo.setLeaveSex(request.getParameter("leaveSex"));
            vo.setLeavePhone(request.getParameter("leavePhone"));
            vo.setLeaveClass(request.getParameter("leaveClass"));
            vo.setLeaveReason(request.getParameter("leaveReason"));
            vo.setLeaveStart(request.getParameter("leaveStart"));
            vo.setLeaveHour(request.getParameter("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 = request.getParameter("id");//取出页面传入的主键，用于查询详情
            LeaveService leaveService = new LeaveServiceImpl();
            Leave vo = leaveService.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("leave_" + 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
     * @throws IOException
     */
    @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
     */

     * @throws IOException
     */
    @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 = request.getParameter("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(request.getParameter("noticeName"));
            vo.setNoticeText(request.getParameter("noticeText"));
            vo.setNoticeType(request.getParameter("noticeType"));
            vo.setCreateDate(request.getParameter("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(request.getParameter("id"));
            NoticeService noticeService = new NoticeServiceImpl();
            //调用Service层删除方法（delete），将对应的记录删除
            noticeService.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Notice对象的属性里
            Notice vo = new Notice();
            vo.setId(Long.valueOf(request.getParameter("id")));
            vo.setNoticeName(request.getParameter("noticeName"));
            vo.setNoticeText(request.getParameter("noticeText"));
            vo.setNoticeType(request.getParameter("noticeType"));
            vo.setCreateDate(request.getParameter("createDate"));
            NoticeService noticeService = new NoticeServiceImpl();
            //调用Service层更新方法（update），更新记录
            noticeService.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 = request.getParameter("id");//取出页面传入的主键，用于查询详情
            NoticeService noticeService = new NoticeServiceImpl();
            Notice vo = noticeService.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("notice_" + to + ".jsp");
        } else {//默认去列表页面

            noticeService.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 = request.getParameter("id");//取出页面传入的主键，用于查询详情
            NoticeService noticeService = new NoticeServiceImpl();
            Notice vo = noticeService.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("notice_" + 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
     * @throws IOException
     */
    @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 = request.getParameter("searchColumn");
        String keyword = request.getParameter("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
        NoticeService noticeService = new NoticeServiceImpl();
        Map<String, Object> map = noticeService.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
        String pageNum = request.getParameter("pageNum");//封装分页参数
        com.demo.util.PageBean<Object> pb = new com.demo.util.PageBean(Integer.valueOf(pageNum != null ? pageNum : "1"), totalRecord);
        params.put("startIndex", pb.getStartIndex());
        params.put("pageSize", pb.getPageSize());
        List list = (List) noticeService.list(params).get("list");//根据分页参数startIndex、pageSize查询出来的最终结果list
        pb.setServlet("NoticeServlet");
        pb.setSearchColumn(searchColumn);
        pb.setKeyword(keyword);

            System.out.println("password=" + password);
            UserService userService = new UserServiceImpl();
            Map<String, Object> params = new HashMap();
            
            
            params.put("startIndex", 0);
            params.put("pageSize", Long.MAX_VALUE);
            List<User> list = (List<User>) userService.list(params).get("list");
            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
            userService.add(vo);
            request.getSession().setAttribute("alert_msg", "注册成功！用户名：[" + username + "]");
            request.getRequestDispatcher("login.jsp").forward(request, response);
        } else if ("logout".equalsIgnoreCase(action)) {//登出
            HttpSession session = request.getSession();
            User user = (User) session.getAttribute("loginUser");
            if (user != null) {
                session.removeAttribute("loginUser");
            }
            response.sendRedirect("login.jsp");
        } else if ("validationCode".equalsIgnoreCase(action)) {
            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;

            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
            g.setFont(new Font("Times New Roman", Font.ITALIC, height));
            g.setColor(getRandomColor(120, 180));// 随机设置字体颜色
            //  用于保存最后随机生成的验证码
            StringBuilder validationCode = new StringBuilder();
            //  验证码的随机字体
            String[] fontNames = {"Times New Roman", "Book antiqua", "Arial"};
            for (int i = 0; i < 4; i++) {
                //  随机设置当前验证码的字符的字体
                g.setFont(new Font(fontNames[random.nextInt(3)], Font.ITALIC, height));
                //  随机获得当前验证码的字符
                char codeChar = codeChars.charAt(random.nextInt(charsLength));
                validationCode.append(codeChar);
                //  随机设置当前验证码字符的颜色
                g.setColor(getRandomColor(10, 100));
                //  在图形上输出验证码字符，x和y都是随机生成的
                g.drawString(String.valueOf(codeChar), 16 * i + random.nextInt(7), height - random.nextInt(6));
            }
            HttpSession session = request.getSession();
            session.setMaxInactiveInterval(5 * 60);
            //  将验证码保存在session对象中，key为validation_code
            session.setAttribute("validationCode", validationCode.toString());
            g.dispose();//  关闭Graphics对象
            OutputStream os = response.getOutputStream();
            ImageIO.write(image, "JPEG", os);// 以JPEG格式向客户端发送图形验证码
        } else if ("resetPassword".equalsIgnoreCase(action)) {
            String msg;
            User loginUser = (User) request.getSession().getAttribute("loginUser");
            String oldPassword = request.getParameter("oldPassword");
            if (!loginUser.getPassword().equals(oldPassword)) {
                msg = "原密码错误！";
            } else {
                String newPassword = request.getParameter("newPassword");
                loginUser.setPassword(newPassword);
                UserService userService = new UserServiceImpl();
                userService.update(loginUser);
                msg = "修改成功！";
            }

            System.out.println("username=" + username);
            System.out.println("password=" + password);
            UserService userService = new UserServiceImpl();
            Map<String, Object> params = new HashMap();
            
            
            params.put("startIndex", 0);
            params.put("pageSize", Long.MAX_VALUE);
            List<User> list = (List<User>) userService.list(params).get("list");
            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
            userService.add(vo);
            request.getSession().setAttribute("alert_msg", "注册成功！用户名：[" + username + "]");
            request.getRequestDispatcher("login.jsp").forward(request, response);
        } else if ("logout".equalsIgnoreCase(action)) {//登出
            HttpSession session = request.getSession();
            User user = (User) session.getAttribute("loginUser");
            if (user != null) {
                session.removeAttribute("loginUser");
            }
            response.sendRedirect("login.jsp");
        } else if ("validationCode".equalsIgnoreCase(action)) {
            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


/**
 * 公告模块的Servlet控制层，负责接收页面传过来的请求参数，根据action参数的值来确定页面要执行的具体操作<br>
 * 而后再调用NoticeService业务层的方法来处理具体的业务，最后将处理完成的结果返回或跳转至相应页面
 */
//@WebServlet("/NoticeServlet")
public class NoticeServlet extends HttpServlet {

    /**
     * 处理Post请求
     *
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    @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 = request.getParameter("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(request.getParameter("noticeName"));
            vo.setNoticeText(request.getParameter("noticeText"));
            vo.setNoticeType(request.getParameter("noticeType"));

    /**
     * 处理Get请求
     *
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    @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 = request.getParameter("searchColumn");
        String keyword = request.getParameter("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
        UserService userService = new UserServiceImpl();
        Map<String, Object> map = userService.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
        String pageNum = request.getParameter("pageNum");//封装分页参数
        com.demo.util.PageBean<Object> pb = new com.demo.util.PageBean(Integer.valueOf(pageNum != null ? pageNum : "1"), totalRecord);
        params.put("startIndex", pb.getStartIndex());
        params.put("pageSize", pb.getPageSize());
        List list = (List) userService.list(params).get("list");//根据分页参数startIndex、pageSize查询出来的最终结果list
        pb.setServlet("UserServlet");
        pb.setSearchColumn(searchColumn);
        pb.setKeyword(keyword);
        pb.setList(list);
        request.getSession().setAttribute("pageBean", pb);
        request.getSession().setAttribute("list", pb.getList());

        response.sendRedirect("user_list.jsp");
    }
}

            this.redirectList(request, response);
        }
    }

    /**
     * 处理Get请求
     *
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    @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 = request.getParameter("searchColumn");
        String keyword = request.getParameter("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
        NoticeService noticeService = new NoticeServiceImpl();
        Map<String, Object> map = noticeService.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
        String pageNum = request.getParameter("pageNum");//封装分页参数
        com.demo.util.PageBean<Object> pb = new com.demo.util.PageBean(Integer.valueOf(pageNum != null ? pageNum : "1"), totalRecord);
        params.put("startIndex", pb.getStartIndex());
        params.put("pageSize", pb.getPageSize());
        List list = (List) noticeService.list(params).get("list");//根据分页参数startIndex、pageSize查询出来的最终结果list
        pb.setServlet("NoticeServlet");
        pb.setSearchColumn(searchColumn);
        pb.setKeyword(keyword);
        pb.setList(list);
        request.getSession().setAttribute("pageBean", pb);
        request.getSession().setAttribute("list", pb.getList());

        response.sendRedirect("notice_list.jsp");
    }
}

            response.sendRedirect("leave_" + 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
     * @throws IOException
     */
    @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 = request.getParameter("searchColumn");
        String keyword = request.getParameter("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
        String pageNum = request.getParameter("pageNum");//封装分页参数
        com.demo.util.PageBean<Object> pb = new com.demo.util.PageBean(Integer.valueOf(pageNum != null ? pageNum : "1"), totalRecord);
        params.put("startIndex", pb.getStartIndex());
        params.put("pageSize", pb.getPageSize());
        List list = (List) leaveService.list(params).get("list");//根据分页参数startIndex、pageSize查询出来的最终结果list
        pb.setServlet("LeaveServlet");
        pb.setSearchColumn(searchColumn);
        pb.setKeyword(keyword);
        pb.setList(list);
        request.getSession().setAttribute("pageBean", pb);
        request.getSession().setAttribute("list", pb.getList());


/**
 * 用户模块的Servlet控制层，负责接收页面传过来的请求参数，根据action参数的值来确定页面要执行的具体操作<br>
 * 而后再调用UserService业务层的方法来处理具体的业务，最后将处理完成的结果返回或跳转至相应页面
 */
//@WebServlet("/UserServlet")
public class UserServlet extends HttpServlet {

    /**
     * 处理Post请求
     *
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    @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 = request.getParameter("action");
        if ("add".equals(action)) {//增加
            User vo = new User();
            //取出页面传进来的各个数据，并设置到User对象的属性里
            vo.setUsername(request.getParameter("username"));
            vo.setPassword(request.getParameter("password"));
            vo.setRealName(request.getParameter("realName"));
            vo.setUserSex(request.getParameter("userSex"));
            vo.setUserPhone(request.getParameter("userPhone"));
            vo.setUserText(request.getParameter("userText"));
            vo.setUserType(request.getParameter("userType"));

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

    /**
     * 处理Post请求
     *
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    @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 = request.getParameter("action");
        if ("add".equals(action)) {//增加
            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(request.getParameter("leaveName"));
            vo.setLeaveSex(request.getParameter("leaveSex"));
            vo.setLeavePhone(request.getParameter("leavePhone"));
            vo.setLeaveClass(request.getParameter("leaveClass"));
            vo.setLeaveReason(request.getParameter("leaveReason"));
            vo.setLeaveStart(request.getParameter("leaveStart"));
            vo.setLeaveHour(request.getParameter("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(request.getParameter("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(request.getParameter("id")));
            vo.setLeaveName(request.getParameter("leaveName"));
            vo.setLeaveSex(request.getParameter("leaveSex"));
            vo.setLeavePhone(request.getParameter("leavePhone"));
            vo.setLeaveClass(request.getParameter("leaveClass"));
            vo.setLeaveReason(request.getParameter("leaveReason"));
            vo.setLeaveStart(request.getParameter("leaveStart"));
            vo.setLeaveHour(request.getParameter("leaveHour"));
            LeaveService leaveService = new LeaveServiceImpl();

            if (user != null) {
                session.removeAttribute("loginUser");
            }
            response.sendRedirect("login.jsp");
        } else if ("validationCode".equalsIgnoreCase(action)) {
            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
            g.setFont(new Font("Times New Roman", Font.ITALIC, height));
            g.setColor(getRandomColor(120, 180));// 随机设置字体颜色
            //  用于保存最后随机生成的验证码
            StringBuilder validationCode = new StringBuilder();
            //  验证码的随机字体
            String[] fontNames = {"Times New Roman", "Book antiqua", "Arial"};
            for (int i = 0; i < 4; i++) {
                //  随机设置当前验证码的字符的字体
                g.setFont(new Font(fontNames[random.nextInt(3)], Font.ITALIC, height));
                //  随机获得当前验证码的字符
                char codeChar = codeChars.charAt(random.nextInt(charsLength));
                validationCode.append(codeChar);
                //  随机设置当前验证码字符的颜色
                g.setColor(getRandomColor(10, 100));
                //  在图形上输出验证码字符，x和y都是随机生成的
                g.drawString(String.valueOf(codeChar), 16 * i + random.nextInt(7), height - random.nextInt(6));
            }
            HttpSession session = request.getSession();
            session.setMaxInactiveInterval(5 * 60);
            //  将验证码保存在session对象中，key为validation_code

            Leave vo = new Leave();
            vo.setId(Long.valueOf(request.getParameter("id")));
            vo.setLeaveName(request.getParameter("leaveName"));
            vo.setLeaveSex(request.getParameter("leaveSex"));
            vo.setLeavePhone(request.getParameter("leavePhone"));
            vo.setLeaveClass(request.getParameter("leaveClass"));
            vo.setLeaveReason(request.getParameter("leaveReason"));
            vo.setLeaveStart(request.getParameter("leaveStart"));
            vo.setLeaveHour(request.getParameter("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 = request.getParameter("id");//取出页面传入的主键，用于查询详情
            LeaveService leaveService = new LeaveServiceImpl();
            Leave vo = leaveService.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("leave_" + 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
     * @throws IOException
     */
    @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 = request.getParameter("searchColumn");
        String keyword = request.getParameter("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();

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