jsp的查询和分页

//这是index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<%@taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>

<form action="${pageContext.request.contextPath}/stu.do?p=search" method="post">

编号:<input type="text" name="sid"> <br>

姓名:<input type=text name="sname"> <br>

性别:<input type=radio name="sex" value=1>男

<input type=radio name="sex" value=0>女 <br>

日期:<input type=text name="start"> 到

<input type=text name="end"> <br>

<input type="hidden" name="page"/>

<input type=submit value='搜索'>

<input type=reset value='重置'>

</form>

<c:if test="${not empty map}">

搜索到结果:${map.sum}条，当前${map.page}/${map.count}页

<hr>

<table border="1" align="center" width="80%">

<tr>

<th>编号</th>

<th>姓名</th>

<th>性别</th>

<th>出生</th>

</tr>

<c:forEach items="${map.list}" var="s">

<tr align="center">

<td>${s.sid}</td>

<td>${s.sname}</td>

<td>${s.sex==1?"男":"女"}</td>

<td>

<fmt:formatDate value="${s.sbirthday}" pattern="yyyy年MM月dd日"/>

</td>

</tr>

</c:forEach>

</table>

<a href="${pageContext.request.contextPath}/stu.do?p=search&page=1">【首 页】</a>

<a href="${pageContext.request.contextPath}/stu.do?p=search&page=${map.page+1 }">【下一页】</a>

<a href="${pageContext.request.contextPath}/stu.do?p=search&page=${map.page-1 }">【上一页】</a>

<a href="${pageContext.request.contextPath}/stu.do?p=search&page=${map.count }">【末 页】</a>

</c:if>

//这是servlet的代码

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Map;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.dao.StuDAO;

public class StuServlet extends HttpServlet {

int size = 3;

StuDAO stuDAO = new StuDAO();

@Override

public void service(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

request.setCharacterEncoding("utf-8");

response.setContentType("text/html;charset=utf-8");

PrintWriter out = response.getWriter();

String p = request.getParameter("p");

if (p.equals("search"))

doSearch(request, response);

}

//分页查询

public void doSearch(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

//要显示页数

String pageString = request.getParameter("page");

int page = 1;

if (pageString!=null && pageString.trim().length()>0)

page = Integer.parseInt(pageString);

//其它条件

String sid = request.getParameter("sid");

String sname = request.getParameter("sname");

String sex = request.getParameter("sex");

String start = request.getParameter("start");

String end = request.getParameter("end");

//查

Map map = stuDAO.fenye(page, size, sid, sname, sex, start, end);

request.setAttribute("map", map);

request.getRequestDispatcher("/index.jsp").forward(request, response);

}

}

//这是dao层

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import com.db.DbUtil;

import com.entity.Student;

public class StuDAO {

DbUtil db = new DbUtil();

/*

*

* select top 3 * from student where 1=1 and sname like ? and sid not in

* (select top 3 sid from student where 1=1 and sname like ? )

*

* select count(*) from student where 1=1 and ....

*/

public Map fenye(Integer page,Integer size,String sid,String sname,String sex,String start,String end){

List ifList = new ArrayList(); //条件

List list = new ArrayList(); //结果

Map map = new HashMap(); //所有结果

StringBuffer sb = new StringBuffer();

if (sid!=null && sid.trim().length()>0)

{

sb.append(" and sid=?");

ifList.add(Integer.parseInt(sid));

}

if (sname!=null && sname.length()>0){

sb.append(" and sname like ?");

ifList.add("%"+sname+"%");

}

if (sex!=null && sex.trim().length()>0){

sb.append(" and sex=?");

ifList.add(Integer.parseInt(sex));

}

if (start!=null && start.trim().length()>0){

sb.append(" and sbirthday>=?");

ifList.add(java.sql.Date.valueOf(start));

}

if (end!=null && end.trim().length()>0){

sb.append(" and sbirthday<=?");

ifList.add(java.sql.Date.valueOf(end));

}

//总条数

String sqlCount = "select count(*) from student where 1=1 "+sb.toString();

ResultSet rsCount = db.getRs(sqlCount, ifList.toArray());

int sum = 0;

try {

rsCount.next();

sum = rsCount.getInt(1);

} catch (SQLException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

int count = sum%size==0?sum/size : sum/size+1;

if (page<1) page = 1;

if (page>count) page=count;

String sqlList = "select top "+size+" * from student where 1=1 "+sb.toString()+" and sid not in (select top "+(page-1)*size+" sid from student where 1=1 "+sb.toString()+")";

System.out.println("count="+sqlCount);

System.out.println("list="+sqlList);

//这句代码很重要

ifList.addAll(ifList);

ResultSet rs = db.getRs(sqlList, ifList.toArray());

try {

while (rs!=null && rs.next()){

Student stu = new Student();

stu.setSid(rs.getInt("sid"));

stu.setSname(rs.getString("sname"));

stu.setSex(rs.getInt("sex"));

stu.setSbirthday(rs.getDate("sbirthday"));

list.add(stu);

}

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

map.put("page", page);

map.put("size", size);

map.put("count", count);

map.put("list", list);

map.put("sum", sum);

return map;

}

//条件查询，不分页

public List condition(String sid,String sname,String sex,String start,String end)

{

List ifList = new ArrayList(); //条件

List list = new ArrayList(); //结果

StringBuffer sb = new StringBuffer("select * from student where 1=1 ");

if (sid!=null && sid.trim().length()>0)

{

sb.append(" and sid=?");

ifList.add(Integer.parseInt(sid));

}

if (sname!=null && sname.length()>0){

sb.append(" and sname like ?");

ifList.add("%"+sname+"%");

}

if (sex!=null && sex.trim().length()>0){

sb.append(" and sex=?");

ifList.add(Integer.parseInt(sex));

}

if (start!=null && start.trim().length()>0){

sb.append(" and sbirthday>=?");

ifList.add(java.sql.Date.valueOf(start));

}

if (end!=null && end.trim().length()>0){

sb.append(" and sbirthday<=?");

ifList.add(java.sql.Date.valueOf(end));

}

ResultSet rs = db.getRs(sb.toString(), ifList.toArray());

try {

while (rs!=null && rs.next()){

Student stu = new Student();

stu.setSid(rs.getInt("sid"));

stu.setSname(rs.getString("sname"));

stu.setSex(rs.getInt("sex"));

stu.setSbirthday(rs.getDate("sbirthday"));

list.add(stu);

}

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return list;

}

/**

* @param args

* jUnit

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

StuDAO stuDAO = new StuDAO();

/*List<Student> list = stuDAO.condition(null, "小", "1", null, null);

for (Student student : list) {

System.out.println(student.getSid()+"\t"+student.getSname()+"\t"+student.getSex());

}*/

stuDAO.fenye(1, 3, null, "小", null, null, null);

}

}