addloanservlet.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.Board;
import cn.edu.jmu.beans.Book;
import cn.edu.jmu.beans.Loan;
import cn.edu.jmu.beans.Privilege;
import cn.edu.jmu.beans.Title;
import cn.edu.jmu.util.MysqlUtil;
import java.io.IOException;
import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Calendar;
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 addLoanServlet 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 message = "";
        int state = 0;
        String brid = request.getParameter("brid");
        String bid = request.getParameter("bid");
        String ptype = request.getParameter("ptype");
        int lid = 0;

        MysqlUtil db = new MysqlUtil("java:/comp/env/jdbc/mysql");
        db.init();
        String sql = "";

        if (bid.equals("")) {
            message = "对不起，书的登录号不能为空，请您重新输入！";
            state = 1;
        } else {
            sql = "select * from book where bid=?";
            String[] param = {bid};
            List result = (List) db.query(sql, param, new BeanListHandler(Book.class));
            if (result.size() == 0) {
                message = "对不起，该图书不存在，请您重新输入！";
                state = 1;
            } else {
                Book book = (Book) result.get(0);
                if (book.getBrState().equals("已出借")) {
                    message = "对不起，该图书已被借出，请你重新输入！";
                    state = 1;
                } else {
                    sql = "select * from loan where lid=(select max(lid) from loan)";
                    List result1 = (List) db.query(sql, new BeanListHandler(Loan.class));
                    if (result1.isEmpty()) {
                        lid = 1000000001;
                    } else {
                        Loan loan = (Loan) result1.get(0);
                        lid = loan.getLid() + 1;
                    }

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

                    Date brDateDate = new Date();
                    String brDate = format.format(brDateDate);

                    sql = "select * from privilege where ptype=?";
                    String[] param1 = {ptype};
                    List result2 = (List) db.query(sql, param1, new BeanListHandler(Privilege.class));
                    Privilege privilege = (Privilege) result2.get(0);

                    int reloanDateNum = privilege.getReloanDateNum();
                    int loanDateNum = privilege.getLoanDateNum();

                    Calendar lastBackDateCalender = Calendar.getInstance();
                    lastBackDateCalender.add(Calendar.DAY_OF_MONTH, loanDateNum);
                    Date lastBackDateDate = lastBackDateCalender.getTime();
                    String lastBackDate = format.format(lastBackDateDate);

                    Object[] param2 = {lid, brid, bid, brDate, reloanDateNum, lastBackDate, "0000-00-00"};
                    sql = "insert into loan(lid,brid,bid,brDate,reloanDateNum,lastBackDate,backDate) values(?,?,?,?,?,?,?)";
                    db.update(sql, param2);

                    sql = "select * from book where bid=?";

                    String tid = book.getTid();

                    sql = "delete from reservation where brid=? and tid=?";
                    String[] param4 = {brid, bid};
                    db.update(sql, param4);

                    String boardDate = brDate.substring(0, 7);
                    sql = "select * from board where boardDate=? and tid=?";
                    String[] param5 = {boardDate, tid};
                    List result5 = (List) db.query(sql, param5, new BeanListHandler(Board.class));

                    int loanNum = 0;
                    if (result5.size() == 0) {
                        sql = "select * from title where tid=?";
                        String[] param6 = {tid};
                        List result6 = (List) db.query(sql, param6, new BeanListHandler(Title.class));
                        Title title = (Title) result6.get(0);
                        String btype = title.getBtype();

                        loanNum = 1;
                        sql = "insert into board(boardDate,loanNum,tid,btype) value(?,?,?,?)";
                        Object[] param7 = {boardDate, loanNum, tid, btype};
                        db.update(sql, param7);
                    } else {
                        Board board = (Board) result5.get(0);
                        loanNum = board.getLoanNum() + 1;
                        sql = "update board set loanNum=? where boardDate=? and tid=?";
                        Object[] param8 = {loanNum, boardDate, tid};
                        db.update(sql, param8);
                    }

                    sql = "update book set brState=? where bid=?";
                    Object[] param9 = {"已出借", bid};
                    db.update(sql, param9);

                    message = "操作成功！";
                }
            }
        }
        if (state == 0) {
            String hyperlink = "<a href=\"librarianManage.jsp\">返回</a></br>" +
                    "<form action=\"/libraryMIS/displayLoanBookInterface\" method=\"post\" name=\"form1\" id=\"form1\">" +
                    "<table align=\"center\"><tr>" +
                    "<td><input type=\"hidden\" name=\"brid\" value=\"" + brid +
                    "\"/></td><td><input type=\"submit\" name=\"Submit1\" value=\"继续借书\"/></td>" +
                    "</tr></table></form>";
            request.setAttribute("title", "操作成功！");
            request.setAttribute("message", message);
            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", "操作失败！");
            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>
}