userloginservlet.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.Librarian;
import cn.edu.jmu.beans.Loan;
import cn.edu.jmu.beans.Reservation;
import cn.edu.jmu.util.MysqlUtil;
import java.io.IOException;
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 userLoginServlet 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 user = request.getParameter("user");
        String userid = request.getParameter("userid");
        String pswd = request.getParameter("pswd");
        String message = "";
        int state = 0;
        if (userid.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 {
            if (user.equals("1")) {
                String brid = userid;
                String sql = "select * from borrower where brid=?";
                String[] param = {brid};

                MysqlUtil db = new MysqlUtil("java:/comp/env/jdbc/mysql");
                db.init();
                List result1 = (List) db.query(sql, param, 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 loan.lid,loan.brid,loan.bid,loan.brDate," +
                            "loan.reloanDateNum,loan.lastBackDate,tname,author,volume " +
                            "from loan,book,title " +
                            "where book.bid=loan.bid and title.tid=book.tid and loan.brid=?";
                    List result2 = (List) db.query(sql, param, new BeanListHandler(Loan.class));

                    String overDate = "false";
                    for (int i = 0; i < result2.size(); i++) {
                        Loan loan = (Loan) result2.get(i);
                        if (loan.getLastBackDate().before(new java.util.Date())) {
                            overDate = "true";
                            break;
                        }
                    }
                    
                    sql="select reservation.*,title.tname from reservation,title where reservation.tid=title.tid and reservation.brid=?";
                    String[] param3={brid};
                    List result3 = (List) db.query(sql, param3, new BeanListHandler(Reservation.class));                    
                    
                    request.setAttribute("pswd", pswd);
                    request.setAttribute("overDate", overDate);
                    request.setAttribute("result", result2);
                    request.setAttribute("rresult", result3);
                    request.setAttribute("borrower", borrower);
                    request.getRequestDispatcher("/borrowerManage.jsp").forward(request, response);
                }
            } else {
                String wid = userid;
                String sql = "select * from librarian where wid=?";
                String[] param = {wid};

                MysqlUtil db = new MysqlUtil("java:/comp/env/jdbc/mysql");
                db.init();
                List result = (List) db.query(sql, param, new BeanListHandler(Librarian.class));

                if (result.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 {
                    Librarian librarian = null;
                    librarian = (Librarian) result.get(0);
                    if (pswd.equals(librarian.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) {
                    request.getRequestDispatcher("/librarianManage.jsp").forward(request, response);
                }
            }
        }
        if (state == 1) {
            String hyperlink = "<a href=\"index.jsp\">返回</a>";
            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>
}