5月11日 CMS 周五

import java.sql.*;
import java.util.ArrayList;
import java.util.List;


public class StudentDao {

    public List<Student> stulist(Integer cpage, Integer pageSize) {
        // TODO Auto-generated method stub
        List<Student> stulist = new ArrayList();
        try {
            Class.forName("com.mysql.jdbc.Driver");
            Connection con = DriverManager.getConnection("jdbc:mysql:///cms01","root","root");
            PreparedStatement pst = con.prepareStatement("select * from student limit "+(cpage-1)*pageSize+","+pageSize);
            ResultSet rs = pst.executeQuery();
            while(rs.next()){
                Student s = new Student(rs.getInt("id"),rs.getString("name"),rs.getString("sex"),rs.getInt("age"));
                stulist.add(s);
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return stulist;
    }

    public Integer count() {
        // TODO Auto-generated method stub
        Integer count = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            Connection con = DriverManager.getConnection("jdbc:mysql:///cms01","root","root");
            PreparedStatement pst = con.prepareStatement("select count(*) from student");
            ResultSet rs = pst.executeQuery();

            if(rs.next()){
                count = rs.getInt(1);
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return count;
    }

}

import java.util.List;


public class StudentService {
    private StudentDao dao = new StudentDao();

    public List<Student> stulist(Integer cpage, Integer pageSize) {
        // TODO Auto-generated method stub
        return dao.stulist(cpage,pageSize);
    }

    public Integer count() {
        // TODO Auto-generated method stub
        return dao.count();
    }

}


import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class StudentServlet extends HttpServlet {
    private StudentService service = new StudentService();
    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
        String cpage = request.getParameter("cpage");

        if(cpage == null){
            cpage = "1";
        }
        Integer pageSize = 2;

        Integer count = service.count();
        Integer totalPage = count/pageSize + (count%pageSize==0?0:1);

        List<Student> stulist = service.stulist(Integer.valueOf(cpage),pageSize);

        request.setAttribute("stulist", stulist);
        request.setAttribute("cpage", cpage);
        request.setAttribute("totalPage", totalPage);
        request.getRequestDispatcher("list.jsp").forward(request,response);

    }
}

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'list.jsp' starting page</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  <script type="text/javascript" src="js/jquery-1.8.2.js"></script>
  <script type="text/javascript">
    function gopage(cpage){
        location="student?cpage="+cpage;
    }
    function jumpPage(){
        var cpage = $("#p").val();
        if(cpage>=1 && cpage <="${totalPage}"){
            gopage(cpage);
        }else{
            alert("输入错误");
        }
    }
  </script>
  </head>

  <body>
    <table>
        <tr>
            <th>id</th>
            <th>name</th>
            <th>sex</th>
            <th>age</th>
        </tr>
        <c:forEach var="s" items="${stulist}">
            <tr>
                <th>${s.id}</th>
                <th>${s.name}</th>
                <th>${s.sex}</th>
                <th>${s.age==1?"新建":s.age==2?"未保存":"保存"}</th>
            </tr>
        </c:forEach>
        <tr>
            <th colspan="21">
                <button onclick="gopage(1)">首页</button>
                <button onclick="gopage(${cpage<=1?1:(cpage-1)})">上页</button>
                <button onclick="gopage(${cpage>=totalPage?totalPage:cpage+1})">下页</button>
                <button onclick="gopage(${totalPage})">末页</button>
                <input type="text" id="p" value="${cpage}" style="width:30px;">
                <button onclick="jumpPage()">跳</button>
            </th>
        </tr>
    </table>
  </body>
</html>

令群轻轻地说：“我同你，只有自己罢了，没有靠山，再不自爱，死路一条。”
——亦舒《吃南瓜的人》

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