cancelreservationservlet.java

图书馆管理系统！利用java的mvc开发！

/*
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 * and open the template in the editor.
 */
package cn.edu.jmu.jc;

import cn.edu.jmu.util.MysqlUtil;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author jiangchen
 */
public class cancelReservationServlet 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 rid = request.getParameter("rid");
        String brid = request.getParameter("brid");
        String pswd = request.getParameter("pswd");
        MysqlUtil db = new MysqlUtil("java:/comp/env/jdbc/mysql");
        db.init();
        String sql = "delete from reservation where rid=?";
        String[] param = {rid};
        db.update(sql, param);
        String hyperlink = "<form action=\"/libraryMIS/userLogin\" method=\"post\">" +
                "<table align=\"center\"><tr><td>" +
                "<input type=\"hidden\" name=\"user\" value=\"1\"/>" +
                "<input type=\"hidden\" name=\"userid\" value=\"" + brid + "\"/>" +
                "<input type=\"hidden\" name=\"pswd\" value=\"" + pswd + "\"/>" +
                "<input type=\"submit\" name=\"Submit1\" value=\"返回\"/>" +
                "</td></tr></table></form>";
        request.setAttribute("title", "操作成功！");
        request.setAttribute("message", "操作成功！");
        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>
}