displayloanbookinterfaceservlet.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.Loan;
import cn.edu.jmu.beans.Privilege;
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 displayLoanBookInterfaceServlet 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 = (String) request.getParameter("brid");
        if (brid.equals("")) {
            message = "对不起，帐号不能为空，请您重新输入！";
            state = 1;
        } else {
            String[] param = {brid};
            String sql = "select * from borrower where brid=?";
            MysqlUtil db = new MysqlUtil("java:/comp/env/jdbc/mysql");
            db.init();
            List result1 = (List) db.query(sql, param, new BeanListHandler(Borrower.class));
            if (result1.isEmpty()) {
                message = "对不起，该帐号不存在，请您重新输入！";
                state = 1;
            } else {
                Borrower borrower = (Borrower) result1.get(0);
                String ptype = borrower.getPtype();
                sql = "select * from privilege where ptype=?";
                String[] p = {ptype};
                List result2 = (List) db.query(sql, p, new BeanListHandler(Privilege.class));
                Privilege privilege = (Privilege) result2.get(0);
                int borrowAmount = privilege.getBorrowAmount();
                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 result3 = (List) db.query(sql, param, new BeanListHandler(Loan.class));

                if (result3.size() == borrowAmount) {
                    request.setAttribute("overAmount", "true");
                } else {
                    request.setAttribute("overAmount", "false");
                }
                String overDate="false";
                for (int i = 0; i < result3.size(); i++) {
                    Loan loan = (Loan) result3.get(i);
                    if (loan.getLastBackDate().before(new java.util.Date())) {                        
                        overDate="true";
                        break;
                    } 
                }
                request.setAttribute("overDate", overDate);
                request.setAttribute("result", result3);
                request.setAttribute("borrower", borrower);                
            }
        }
        if (state == 0) {
            request.getRequestDispatcher("/loanBook.jsp").forward(request, response);
        } else {
            String hyperlink = "<a href=\"librarianManage.jsp\">返回</a>";
            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>
}