lostbookservlet.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.Book;
import cn.edu.jmu.beans.Title;
import cn.edu.jmu.util.MysqlUtil;
import java.io.IOException;
import java.io.PrintWriter;
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 lostBookServlet 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");
        PrintWriter out = response.getWriter();
        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 bid = request.getParameter("bid");
        String brid = request.getParameter("brid");
        String sql = "select * from book where bid=?";
        String[] param1 = {bid};
        MysqlUtil db = new MysqlUtil("java:/comp/env/jdbc/mysql");
        db.init();
        List result1 = (List) db.query(sql, param1, new BeanListHandler(Book.class));
        Book book = (Book) result1.get(0);
        String tid = book.getTid();

        sql = "select * from title where tid=?";
        String[] param2 = {tid};
        List result2 = (List) db.query(sql, param2, new BeanListHandler(Title.class));
        Title title = (Title) result2.get(0);
        String message = "《" + title.getTname() + "》的赔偿金额为" + String.valueOf(title.getPrice() * 3) + "元";

        String hyperlink = "<p>&nbsp</p><input type=button value=\"返回\" onClick=\"history.back(-1)\">" +
                "<form action=\"/libraryMIS/lostBookReturn\"><table align=\"center\">" +
                "<input type=\"submit\" value=\"已收罚金\"/>" +
                "<input type=\"hidden\" value=\"" + bid + "\" name=\"bid\">" +
                "<input type=\"hidden\" value=\"" + brid + "\" name=\"brid\"></table></form>";
        request.setAttribute("title", "操作成功！");
        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>
}