DAO数据访问
package dao;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;
import utils.JdbcUtils;
import utils.PageBean;
import entity.Muli;
public class MuliDao {
// 创建QueryRunner对象
private QueryRunner qr = JdbcUtils.getQueryRuner();
// 查找全部信息列表
public List<Muli> listMuliAll() {
String sql = "SELECT * FROM mulihuji ";
try {
// 多行数据，封装成对象的集合
List<Muli> listmuli = qr.query(sql, new BeanListHandler<Muli>(Muli.class));
return listmuli;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
// 分页显示全部数据
public void listMuliAll(PageBean<Muli> pb,Muli muli) throws SQLException {
String countsql = "select count(*) from mulihuji where 1=1";
String sql = "select * from mulihuji where 1=1";
List<Object> params = new ArrayList<Object>();
// 添加查询条件
String xm = muli.getXm();
if (xm != null && xm != "") {
countsql += " and xm like ?";
sql += " and xm like ?";
params.add("%" + xm + "%");
}
String sfzh = muli.getSfzh();
if (sfzh != null && sfzh != "") {
countsql += " and sfzh like ?";
sql += " and sfzh like ?";
params.add("%" + sfzh + "%");
}
//得到总记录数
Long count = qr.query(countsql, new ScalarHandler<Long>(),params.toArray());
pb.setTotalCount(count.intValue());
/*
* 问题： jsp页面，如果当前页为首页，再点击上一页报错！ 如果当前页为末页，再点下一页显示有问题！ 解决： 1. 如果当前页 <= 0;
* 当前页设置当前页为1; 2. 如果当前页 > 最大页数； 当前页设置为最大页数
*/
// 判断
if (pb.getCurrentPage() <= 0) {
pb.setCurrentPage(1); // 把当前页设置为1
} else if (pb.getCurrentPage() > pb.getTotalPage()) {
pb.setCurrentPage(pb.getTotalPage()); // 把当前页设置为最大页数
}
// 1. 获取当前页： 计算查询的起始行、返回的行数
int currentPage = pb.getCurrentPage();
int index = (currentPage - 1) * pb.getPageCount(); // 查询的起始行
int pagecount = pb.getPageCount(); // 每页的行数
sql += " limit ?,?";
params.add(index);
params.add(pagecount);
List<Muli> pageData = qr.query(sql, new BeanListHandler<Muli>(Muli.class),params.toArray() ); //获取一页的数据
// 设置到pb对象中
pb.setPageData(pageData);
}
}
Servlet设计
package servlet;
import java.io.IOException;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import dao.MuliDao;
import entity.Muli;
import utils.PageBean;
/**
* Servlet implementation class QueryListMuliServlet
*/
@WebServlet("/querymuli")
public class QueryListMuliServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
String xm = request.getParameter("xm");
String sfzh = request.getParameter("sfzh");
//实例化实体类并赋值
Muli muli=new Muli();
muli.setXm(xm);
muli.setSfzh(sfzh);
//1. 获取“当前页”参数； (第一次访问当前页为null)
String currPage = request.getParameter("currentPage");
// 判断
if (currPage == null || "".equals(currPage.trim())){
currPage = "1"; // 若第一次访问，设置当前页为1;
}
// 转换为整数型
int currentPage = Integer.parseInt(currPage);
//实例化pageben类
PageBean<Muli> pb = new PageBean<Muli>();
pb.setCurrentPage(currentPage);
try {
//调用数据访问的方法，传递两个参数
MuliDao mulidao = new MuliDao();
mulidao.listMuliAll(pb,muli);
request.setAttribute("pageBean", pb);
request.getRequestDispatcher("/querylist.jsp").forward(request, response);
return;
} catch (SQLException e) {
e.printStackTrace();
request.setAttribute("errorMsg", e.getMessage());
}
request.getRequestDispatcher("/error.jsp").forward(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
JSP页面：分为两个页面，1.提交查询条件，2.返回查询结果
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>查询</title>
<style type="text/css">
#chaxun{margin:0 auto; width:600px;}
#jieguo{width:600px;margin:20px auto; border:1px solid; }
</style>
</head>
<body>
<div id="chaxun">
<form action="${pageContext.request.contextPath }/querymuli" method="get" target="list">
<input type="text" name="sfzh">
<input type="submit" value="Submit">
</form>
</div>
<div id="jieguo"><!--采用框架页面-->
<iframe name="list" frameborder="0" style="width:600px;height:400px;"></iframe>
</div>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>结果</title>
</head>
<body>
<%String result=request.getParameter("theName"); %>
<%=result %>
<table>
<thead>
<tr>
<th style="width: 50px;font-weight:bold; text-align: center;">序号</th>
<th style="width: 80px; font-weight:bold; text-align: center;">身份证号</th>
<th style="width: 100px; font-weight:bold; text-align: center;">姓名</th>
<th style="width: 100px; font-weight:bold; text-align: center;">性别</th>
<th style="width: 100px; font-weight:bold; text-align: center;">操作</th>
</tr>
</thead>
<tbody>
<c:choose>
<c:when test="${not empty requestScope.pageBean.pageData}">
<c:forEach items="${requestScope.pageBean.pageData}" var="mulilist" varStatus="varSta"> <!-- items是serverlet传过来的setAttribute的引号里的 -->
<tr style="text-align: center;">
<!-- 数据居中 -->
<td>${(pageBean.currentPage-1)*pageBean.pageCount+varSta.count}</td>
<!-- 序号=（当前页码-1）*每页条数+index+1 -->
<td>${mulilist.sfzh}</td>
<td>${mulilist.xm}</td>
<td>${mulilist.xb }</td>
<td><a href="${pageContext.request.contextPath }/QueryTxlServlet?id=${mulilist.sfzh}">修改</a> <a href="${pageContext.request.contextPath }/DelTxlServlet?id=${mulilist.sfzh}">删除</a></td>
</tr>
</c:forEach>
</c:when>
<c:otherwise>
<tr>
<td colspan="4">对不起，没有你要找的数据</td>
</tr>
</c:otherwise>
</c:choose>
<!-- 页码导航区 -->
<tr>
<td colspan="5" align="center">
当前${requestScope.pageBean.currentPage }/${requestScope.pageBean.totalPage }页
<c:if test="${requestScope.pageBean.totalPage!=1}">
<a href="?sfzh=${requestScope.ml.sfzh}¤tPage=1">首页</a>
<a href="?sfzh=${requestScope.ml.sfzh}¤tPage=${requestScope.pageBean.currentPage-1}">上一页</a>
<a href="?sfzh=${requestScope.ml.sfzh}¤tPage=${requestScope.pageBean.currentPage+1}">下一页</a>
<a href="?sfzh=${requestScope.ml.sfzh}¤tPage=${requestScope.pageBean.totalPage}">末页</a>
</c:if>
</td>
</tr>
</tbody>
</table>
</body>
</html>