reserveservlet.java

图书馆管理系统！利用java的mvc开发！

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package cn.edu.jmu.jc;

import cn.edu.jmu.beans.Borrower;
import cn.edu.jmu.beans.Reservation;
import cn.edu.jmu.util.MysqlUtil;
import java.io.IOException;
import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.dbutils.handlers.BeanListHandler;

/**
 *
 * @author jiangchen
 */
public class reserveServlet extends HttpServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        request.setCharacterEncoding("UTF-8");
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet 方法。单击左侧的 + 号以编辑代码。">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
        if (request.getHeader("referer") == null) {
            response.sendRedirect("index.jsp");
        } else {
            doPost(request, response);
        }
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
        String tid = request.getParameter("tid");
        String brid = request.getParameter("brid");
        String pswd = request.getParameter("pswd");
        String message = "";
        int state = 0;
        MysqlUtil db = new MysqlUtil("java:/comp/env/jdbc/mysql");
        db.init();
        String sql = "";
        if (brid.equals("")) {
            message = "对不起，用户名不能为空，请您重新输入！<br>";
            state = 1;
        } else if (pswd.equals("")) {
            message = "对不起，密码不能为空，请您重新输入！<br>";
            state = 1;
        } else {
            sql = "select * from borrower where brid=?";
            String[] param1 = {brid};
            List result1 = (List) db.query(sql, param1, new BeanListHandler(Borrower.class));
            Borrower borrower = null;
            if (result1.size() == 0) {
                message = "对不起，用户名不存在或密码错误，请您重新输入！<br>";
                state = 1;
            } else {
                borrower = (Borrower) result1.get(0);
                if (pswd.equals(borrower.getPswd()) == false) {
                    message = "对不起，用户名不存在或密码错误，请您重新输入！<br>";
                    state = 1;
                }
            }
        }

        if (state == 0) {
            sql = "select * from reservation where rid=(select max(rid) from reservation)";
            List result2 = (List) db.query(sql, new BeanListHandler(Reservation.class));
            int rid = 0;
            if (result2.isEmpty()) {
                rid = 10001;
            } else {
                Reservation reservation = (Reservation) result2.get(0);
                rid = reservation.getRid() + 1;
            }

            Format format = new SimpleDateFormat("yyyy-MM-dd");

            Date rsvtTimeDate = new Date();
            String rsvtTime = format.format(rsvtTimeDate);
            
            sql="insert into reservation(rid,brid,tid,rsvtTime) value(?,?,?,?)";
            String[] param3={String.valueOf(rid),brid,tid.trim(),rsvtTime};
            db.update(sql, param3);
            
            String hyperlink = "<a href=\"javascript:window.close()\">返回</a>";
            request.setAttribute("title", "预约成功！");
            request.setAttribute("message","预约成功！");
            request.setAttribute("hyperlink", hyperlink);
            request.getRequestDispatcher("/result.jsp").forward(request, response); 
        }else{            
            String hyperlink = "<input type=button value=\"返回\" onClick=\"history.back(-1)\"/>";
            request.setAttribute("title", "登入失败！");
            request.setAttribute("message", message);
            request.setAttribute("hyperlink", hyperlink);
            request.getRequestDispatcher("/result.jsp").forward(request, response);        
        }




    }

    /** 
     * Returns a short description of the servlet.
     */
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}