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jsp分页功能的实现

2014-11-19 21:08 399 查看

package Fen;

import java.io.IOException;

import java.io.PrintWriter;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.omg.CORBA.PUBLIC_MEMBER;

import myshop.MysqlMY;

public class FenYe extends HttpServlet {

   int pageNow = 1;

   int pageSize = 3;

   int rowCount = 0;

   int pageCount = 0;

   Connection cn;

   PreparedStatement ps;

   ResultSet rs;

   MysqlMY mysqlMY ;



   public void doGet(HttpServletRequest request, HttpServletResponse response)

           throws ServletException, IOException {

       //使用数据库得到页的记录 rowCount

       response.setContentType("text/html;charset=GBK");

       PrintWriter out = response.getWriter();



           String aString = (String)(request.getParameter("pageNow"));



           if(aString!=null){

              pageNow = Integer.parseInt(aString);

           }





       out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");

       out.println("<HTML>");

       out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");

       out.println(" <BODY >");

       out.println("<script type='text/javascript' laguage='javascript'>");

       out.println("function ok(){var "

               + "pageNow = document.getElementById('tiao')"

               + "window.alert(pageNow.value);"

               + "window.open('FenYe?pageNow='+pageNow.value+,'_self'}");

       out.println("</script>");

       out.println(" <br/><br/><br/><br/><br/><br/>");

       out.println(" <center>");

       out.println("<form>");





   //设计一个方法得到我们的到rowCout

                    mysqlMY = new MysqlMY();

                   cn = mysqlMY.getConnection();

               try {

                   ps = cn.prepareStatement("select count(*) from book");

                   rs =ps.executeQuery();

                   if(rs.next()){

                       rowCount = rs.getInt(1);

                       out.println("共有");

                       out.println(rowCount);

                       out.println("本书");

                           out.println(" <br/>");

                       }

                   }catch (SQLException e) {

                   // TODO Auto-generated catch block

                   e.printStackTrace();

               }finally{

                   try {

                       if(rs!=null){rs.close();}

                       if(ps!=null){ps.close();}

                       if(cn!=null){cn.close();}

                   } catch (Exception e) {

                       // TODO Auto-generated catch block

                       e.printStackTrace();

                   }



               }



//得到页数pageCount

                   if(rowCount%pageSize==0){



                   pageCount = rowCount/pageSize;

               }else{



                   pageCount = rowCount/pageSize+1;



               }



                   out.println(" <table border="+1+" cellspacing="+0+" width=600 height= 200 >");

                   out.println(" <tr align= center>");

                   out.println(" <td>id</td>");

                   out.println(" <td>书名</td>");

                   out.println(" <td>出版社</td>");

                   out.println(" <td>作者</td>");

                   out.println(" <td>价钱</td>");

                   out.println(" <td>数量</td>");

                   out.println(" </tr>");

//显示我们的页数

           try {

               cn =mysqlMY.getConnection();

           //   ps = cn.prepareStatement("select * from book limit 0,3");

           ps = cn.prepareStatement("select * from book limit "+((pageNow)*3-3)+","+pageSize);

               //ps.setInt(1, pageNow);

               //ps.setInt(2, pageNow * pageSize - pageSize);

                   rs = ps.executeQuery();

   //分页显示千万不能写成if

                   while(rs.next()){

                       out.println(" <tr align= center>");

                       out.println("<td>"+rs.getInt(1)+"</td>");

                       out.println("<td>"+rs.getString(2)+"</td>");

                       out.println("<td>"+rs.getString(3)+"</td>");

                       out.println("<td>"+rs.getString(4)+"</td>");

                       out.println("<td>"+rs.getInt(5)+"</td>");

                       out.println("<td>"+rs.getInt(6)+"</td>");

                       out.println(" </tr>");



                   }

           } catch (SQLException e) {

               // TODO Auto-generated catch block

               e.printStackTrace();

           }



       out.println(" </table>");





       out.println("<br/>");

       if(pageNow!=1){

       out.println("<a href='FenYe?pageNow="+(pageNow-1)+"'>前一页</a>");

       }



       for (int i = pageNow+1; i <=pageNow+2; i++) {

           out.println("<a href='FenYe?pageNow="+i+"'>"+i+"</a>");

       }



       if(pageNow!=pageCount){

       out.println("<a href='FenYe?pageNow="+(pageNow+1)+"'>下一页</a>");

       }

       out.println("当前页："+pageNow+"总页数:"+rowCount);

       out.println("跳转到：<input typw='text' name='tiaot' id='tiao' /><input type='button' name='tiaob' value='跳转'onClick = 'ok()'>");

       out.println("</form>");

       out.println(" </center");

       out.println(" </BODY>");

       out.println("</HTML>");

       out.flush();

       out.close();

   }





   public void destroy() {

       super.destroy();

   }

   public void init() throws ServletException {

       // Put your code here

   }

}

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