bg_bookupdate.java

用J2EE开发的网站,可以应用到图书馆,图书超市

package ksnb;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;

public class bg_bookupdate extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=GBK";
    //Initialize global variables
    private BG_Message message=null;
    public void init() throws ServletException {
        message=new BG_Message();
    }

    //Process the HTTP Post request
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        BG_bookmanage book=new BG_bookmanage();
        HttpSession session=request.getSession(true);
        int x;
        String button=request.getParameter("button");
        response.setContentType(CONTENT_TYPE);
        System.out.println(button);
        if(button.equals("delete"))   //删除图书
        {
            x=book.delete(request,response);
            if(x>0)
            {
                response.sendRedirect("ok.html");
            }
        }
        if(button.equals("updatebookmessage"))   //修改图书信息
        {
            x=book.update(request,response);
            if(x>0)
            {
                response.sendRedirect("ok.html");
                System.out.println("修改成功!!!");
            }
        }
       if(button.equals("bookadd"))
       {
           x=book.add(request,response);
           if(x>0)
           {
               response.sendRedirect("ok.html");
               System.out.println("修改成功!!!");
           }
       }
       if(button.equals("opinion"))
       {
           System.out.println("opinoin");
           message.Query(request);
           RequestDispatcher rd = request.getRequestDispatcher("BG_Message.jsp");
           rd.forward(request, response);
       }
       if(button.equals("DeleteOpinion"))
       {
           message.Delete(request);
           session.setAttribute("info","删除成功");
           RequestDispatcher rd = request.getRequestDispatcher("ok.jsp");
           rd.forward(request, response);

       }
    }
    //Clean up resources
    public void destroy() {
    }
}