selectservlet.java

jsp+servlet+javaBean实现MVC

package com.wang.servlet;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import com.wang.bean.*;

/*
 提供查找控制的servlet
 */

public class SelectServlet
    extends HttpServlet
{
    private static final String CONTENT_TYPE = "text/html; charset=GBK";

    //Initialize global variables
    public void init()
        throws ServletException
    {
    }

    //Process the HTTP Get request
    public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
    {
        DataBean db = new DataBean();
        String selectValue="";
        if (request.getParameter("selectValue") != null)
        {
            selectValue = request.getParameter("selectValue");

            int page;
            if (request.getParameter("page") != null)
            {
                page = Integer.parseInt(request.getParameter("page"));
            }
            else
            {
                page = 1;
            }
            if (request.getParameter("action") != null)
            {
                if (request.getParameter("action").equals("frist"))
                {
                    page = 1;
                }
                else if (request.getParameter("action").equals("last"))
                {
                    page = db.PAGECOUNT;
                }
                else if (request.getParameter("action").equals("back"))
                {
                    page -= 1;
                }
                else if (request.getParameter("action").equals("frist"))
                {
                    page += 1;
                }

            }
           ArrayList list = db.selectCDBean(selectValue, page, 10);
           request.getSession().removeAttribute("selectList");
           request.getSession().setAttribute("selectList",list);
            int pagecount=db.PAGECOUNT;
            request.setAttribute("selectValue",selectValue);
            request.setAttribute("page",page);
            request.setAttribute("pagecount",pagecount);

        }
        RequestDispatcher rd=request.getRequestDispatcher("select.jsp?select="+selectValue);
        rd.forward(request,response);

    }

    //Process the HTTP Post request
    public void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
    {
        doGet(request, response);
    }

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