A simple hotel background management system based on jsp+servlet+mysql

land

Chart

Add rooms

Room management

Room information editing

User list

User management

Administrator management

Administrators add

Technical description

development tool ： Idea/Eclipse
database ： mysql
Jar Warehouse ： Ordinary jar package
Front frame ：jquery/Bootstrap
Back end framework ： Spring+SpringMVC+Mybatis

Information note

be based on JSP+Servlet+MySQL Simple hotel backstage management system , Include administrator role , The overall function includes user room management , User management , Administrator management, etc .

@WebServlet("/loginServlet")
public class loginServlet extends HttpServlet {
    public loginServlet() {
        super();
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        PrintWriter out = response.getWriter();
        String managerID = request.getParameter("ManagerID");
        String managePwd = request.getParameter("ManagePwd");
        String validateCode = request.getParameter("validateCode");
        String sessionValidateCode = (String)request.getSession().getAttribute("SESSION_VALIDATECODE");
        manageDAO manageDAO = new manageDAO();
        Manager login = manageDAO.login(managerID, managePwd);
        if(!sessionValidateCode.equals(validateCode)){
            out.print("<script type='text/javascript'>");
            out.print("alert(' Error in captcha input ！');");
            out.print("window.location='/login.jsp';");
            out.print("</script>");
            return ;
        }else if (login != null){
            // Login successful , Use session domain attributes to record user information , Enter the main management interface 
            request.getSession().setAttribute("SESSION_USER", login);
            response.sendRedirect("/index.jsp");
        }else {
            //  Login failed , Error message prompt , Return to login page 
            out.print("<script type='text/javascript'>");
            out.print("alert(' Wrong user name or password , Please re-enter ！');");
            out.print("window.location='/login.jsp';");
            out.print("</script>");
        }

    }
}

 

@WebServlet("/ValidateCodeServlet")
public class ValidateCodeServlet extends HttpServlet {
    public ValidateCodeServlet() {
        super();
    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         response.setContentType("image/jpeg");
        //  Get binary data output stream object 
        ServletOutputStream out = response.getOutputStream();
        //  Create buffer image 
        int width = 60;
        int height = 20;
        BufferedImage imgbuf = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB);
        Graphics2D g = imgbuf.createGraphics();
        //  Set the background color 
        g.setColor(getRandColor(200, 250));
        //  Set image shape, width and height 
        g.fillRect(0, 0, width, height);
        //  Randomly generated 100 Interference lines , The authentication code in the image is not easy to be detected by other programs 
        Random r = new Random();
        g.setColor(getRandColor(160, 200));
        for (int i = 0; i < 100; i++) {
            int x = r.nextInt(width);
            int y = r.nextInt(height);
            int xl = r.nextInt(12);
            int yl = r.nextInt(12);
            g.drawLine(x, y, x + xl, y + yl);
        }
        //  Randomly generated 100 A point of interruption , The verification code in the image is not easy to be detected by other analysis programs 
        g.setColor(getRandColor(120, 240));
        for (int i = 0; i < 100; i++) {
            int x = r.nextInt(width);
            int y = r.nextInt(height);
            g.drawOval(x, y, 0, 0);
        }
        //  Randomly generated 0-9 Between 4 Digit verification code 
        g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
        String code = "";
        for (int i = 0; i < 4; i++) {
            String rand = String.valueOf(r.nextInt(10));
            code += rand;
            g.setColor(new Color(20 + r.nextInt(110), 20 + r.nextInt(110),
                    20 + r.nextInt(110)));
            g.drawString(rand, 13 * i + 6, 16);
        }
        //  Save the verification code to session in 
        request.getSession().setAttribute("SESSION_VALIDATECODE", code);
        //  Output image 
        ImageIO.write(imgbuf, "JPEG", out);
        out.close();
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    }

    //  Get random colors in the specified range 
    private Color getRandColor(int fc, int bc) {
        Random random = new Random();
        if (fc > 255)
            fc = 255;
        if (fc < 0)
            fc = 0;
        if (bc > 255)
            bc = 255;
        if (bc < 0)
            bc = 0;
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);

    }
}