lostbookreturnservlet.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.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 lostBookReturnServlet 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 bid = request.getParameter("bid");
        String brid = request.getParameter("brid");

        String sql = "delete from loan where bid=? and brid=?";
        String[] param1 = {bid, brid};
        MysqlUtil db = new MysqlUtil("java:/comp/env/jdbc/mysql");
        db.init();
        db.update(sql, param1);
        
        sql="delete from book where bid=?";
        String[] param2={bid};
        db.update(sql, param2);
        
        String message="丢失图书还书成功！";
        String hyperlink = "<p>&nbsp</p><a href=\"librarianManage.jsp\">返回</a>" +
                "<form action=\"/libraryMIS/displayReturnBookInterface\"><table align=\"center\">" +
                "<input type=\"submit\" value=\"还有图书丢失\"/>" +               
                "<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>
}