用户信息分页查询功能
用户信息分页查询功能
分析：
具体步骤：
后台代码的实现
PageBean实体类：
package com.peng.ca.domain; import java.util.List; /** * 分页工具对象 */ public class PageBean<T> { private int totalCount; //总记录数 private int totalPage; //总页码 private List<T> list; //每页的数据 private int currentPage; //当前页码 private int rows; //每页显示的记录数 public PageBean() { } public PageBean(int totalCount, int totalPage, List<T> list, int currentPage, int rows) { this.totalCount = totalCount; this.totalPage = totalPage; this.list = list; this.currentPage = currentPage; this.rows = rows; } public int getTotalCount() { return totalCount; } public void setTotalCount(int totalCount) { this.totalCount = totalCount; } public int getTotalPage() { return totalPage; } public void setTotalPage(int totalPage) { this.totalPage = totalPage; } public List<T> getList() { return list; } public void setList(List<T> list) { this.list = list; } public int getCurrentPage() { return currentPage; } public void setCurrentPage(int currentPage) { this.currentPage = currentPage; } public int getRows() { return rows; } public void setRows(int rows) { this.rows = rows; } @Override public String toString() { return "PageBean{" + "totalCount=" + totalCount + ", totalPage=" + totalPage + ", list=" + list + ", currentPage=" + currentPage + ", rows=" + rows + '}'; } }
UserDao：
/** * 查询总记录数 * @return */ int findTotalCount(); /** * 分页查询每页记录 * @param start * @param rows * @return */ List<User> findByPage(int start, int rows);
UserDaoImpl：
@Override public int findTotalCount() { String sql = "select count(*) from user"; return template.queryForObject(sql,Integer.class); } @Override public List<User> findByPage(int start, int rows) { String sql = "select * from user limit ? , ?"; return template.query(sql,new BeanPropertyRowMapper<User>(User.class),start,rows); }
UserService：
/** * 分页查询 * @param currentPage * @param rows * @return */ PageBean<User> findUserByPage(String currentPage, String rows);
UserServiceImpl：
@Override public PageBean<User> findUserByPage(String _currentPage, String _rows) { int currentPage = Integer.parseInt(_currentPage); int rows = Integer.parseInt(_rows); if (currentPage< 1){ currentPage = 1; } //创建空的PageBean对象 PageBean<User> pb = new PageBean<User>(); //调用dao查询总记录数 int totalCount = dao.findTotalCount(); pb.setTotalCount(totalCount); //计算总页码 int totalPage = (totalCount % rows) == 0 ? totalCount/rows : (totalCount/rows) +1; //int totalPage = (int)Math.ceil((double)totalCount / rows); if (currentPage > totalPage){ currentPage = totalPage; } //设置参数 pb.setCurrentPage(currentPage); pb.setRows(rows); //调用dao查询list集合 //计算开始的记录索引 int start = (currentPage-1) * rows; List<User> list = dao.findByPage(start,rows); pb.setList(list); pb.setTotalPage(totalPage); return pb; }
FindUserByPageServlet：
@WebServlet("/findUserByPageServlet")
public class FindUserByPageServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//获取参数
String currentPage = request.getParameter("currentPage");//当前页码
String rows = request.getParameter("rows");//每页显示条数
if (currentPage == null || "".equals(currentPage)){
currentPage = "1";
}
if (rows == null || "".equals(rows)){
rows = "5";
}
//调用service查询
UserServiceImpl service = new UserServiceImpl();
PageBean<User> pb = service.findUserByPage(currentPage,rows);
//将PageBean存入request
request.setAttribute("pb",pb);
//转发到list.jsp页面
request.getRequestDispatcher("/list.jsp").forward(request,response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}
list.jsp进行了修改：
分页的修改：
<div>
<nav aria-label="Page navigation">
<ul class="pagination">
<c:if test="${pb.currentPage == 1}">
<li class="disabled">
</c:if>
<c:if test="${pb.currentPage != 1}">
<li>
</c:if>
<a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${pb.currentPage - 1}&rows=5" aria-label="Previous">
<span aria-hidden="true">«</span>
</a>
</li>
<c:forEach begin="1" end="${pb.totalPage}" var="i">
<c:if test="${pb.currentPage == i}">
<li class="active"><a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${i}&rows=5">${i}</a></li>
</c:if>
<c:if test="${pb.currentPage != i}">
<li><a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${i}&rows=5">${i}</a></li>
</c:if>
</c:forEach>
<c:if test="${pb.currentPage == pb.totalPage}">
<li class="disabled">
</c:if>
<c:if test="${pb.currentPage != pb.totalPage}">
<li>
</c:if>
<a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${pb.currentPage + 1}&rows=5" aria-label="Next">
<span aria-hidden="true">»</span>
</a>
</li>
<span style="font-size: 25px;margin-left: 5px">
共${pb.totalCount}条记录，共${pb.totalPage}页
</span>
</ul>
</nav>
</div>
完整的 list.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<!-- 网页使用的语言 -->
<html lang="zh-CN">
<head>
<!-- 指定字符集 -->
<meta charset="utf-8">
<!-- 使用Edge最新的浏览器的渲染方式 -->
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<!-- viewport视口：网页可以根据设置的宽度自动进行适配，在浏览器的内部虚拟一个容器，容器的宽度与设备的宽度相同。
width: 默认宽度与设备的宽度相同
initial-scale: 初始的缩放比，为1:1 -->
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
<title>用户信息管理系统</title>
<!-- 1. 导入CSS的全局样式 -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- 2. jQuery导入，建议使用1.9以上的版本 -->
<script src="js/jquery-2.1.0.min.js"></script>
<!-- 3. 导入bootstrap的js文件 -->
<script src="js/bootstrap.min.js"></script>
<style type="text/css">
td, th {
text-align: center;
}
</style>
<script>
function deleteUser(id) {
//判断用户安全提示
if (confirm("确定要删除吗?")){
location.href = "${pageContext.request.contextPath}/delUserServlet?id="+id;
}
}
window.onload = function () {
//给删除选中按钮添加单击事件
document.getElementById("delSelected").onclick = function () {
if (confirm("确定要删除选中的吗?")){
var flag = false;
//判断是否有选中条目
var cbs = document.getElementsByName("uid");
for (let i = 0; i <cbs.length; i++) {
if (cbs[i].checked){
//有一个条目选中
flag = true;
break;
}
}
if (flag){//有条目被选中
//表单提交：
document.getElementById("form").submit();
}
}
}
//1.获取第一个cb
document.getElementById("firstCb").onclick = function () {
//获取下边列表的所有的cd
var cbs = document.getElementsByName("uid");
//遍历
for (let i = 0; i <cbs.length; i++) {
//设置这些cbs[i]的checked状态=firstCb.的checked状态
cbs[i].checked = this.checked;
}
}
}
</script>
</head>
<body>
<div class="container">
<h3 style="text-align: center">用户信息列表</h3>
<div style="float: left">
<form class="form-inline">
<div class="form-group">
<label for="exampleInputName2">姓名</label>
<input type="text" class="form-control" id="exampleInputName2">
</div>
<div class="form-group">
<label for="exampleInputName3">籍贯</label>
<input type="text" class="form-control" id="exampleInputName3">
</div>
<div class="form-group">
<label for="exampleInputEmail2">邮箱</label>
<input type="email" class="form-control" id="exampleInputEmail2">
</div>
<button type="submit" class="btn btn-default">查询</button>
</form>
</div>
<div style="float: right;margin:5px;">
<a class="btn btn-primary" href="${pageContext.request.contextPath}/add.jsp">添加联系人</a>
<a class="btn btn-primary" href="javascript:void(0);" id="delSelected">删除选中</a>
</div>
<form id="form" action="${pageContext.request.contextPath}/delSelectedServlet" method="post">
<table border="1" class="table table-bordered table-hover">
<tr class="success">
<th><input type="checkbox" id="firstCb"></th>
<th>编号</th>
<th>姓名</th>
<th>性别</th>
<th>年龄</th>
<th>籍贯</th>
<th>QQ</th>
<th>邮箱</th>
<th>操作</th>
</tr>
<c:forEach items="${pb.list}" var="user" varStatus="s">
<tr>
<td><input type="checkbox" name="uid" value="${user.id}"></td>
<td>${s.count}</td>
<td>${user.name}</td>
<td>${user.gender}</td>
<td>${user.age}</td>
<td>${user.address}</td>
<td>${user.qq}</td>
<td>${user.email}</td>
<td>
<a class="btn btn-default btn-sm" href="${pageContext.request.contextPath}/findUserServlet?id=${user.id}">修改</a>
<a class="btn btn-default btn-sm" href="javascript:deleteUser(${user.id});">删除</a>
</td>
</tr>
</c:forEach>
</table>
</form>
<div>
<nav aria-label="Page navigation">
<ul class="pagination">
<c:if test="${pb.currentPage == 1}">
<li class="disabled">
</c:if>
<c:if test="${pb.currentPage != 1}">
<li>
</c:if>
<a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${pb.currentPage - 1}&rows=5" aria-label="Previous">
<span aria-hidden="true">«</span>
</a>
</li>
<c:forEach begin="1" end="${pb.totalPage}" var="i">
<c:if test="${pb.currentPage == i}">
<li class="active"><a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${i}&rows=5">${i}</a></li>
</c:if>
<c:if test="${pb.currentPage != i}">
<li><a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${i}&rows=5">${i}</a></li>
</c:if>
</c:forEach>
<c:if test="${pb.currentPage == pb.totalPage}">
<li class="disabled">
</c:if>
<c:if test="${pb.currentPage != pb.totalPage}">
<li>
</c:if>
<a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${pb.currentPage + 1}&rows=5" aria-label="Next">
<span aria-hidden="true">»</span>
</a>
</li>
<span style="font-size: 25px;margin-left: 5px">
共${pb.totalCount}条记录，共${pb.totalPage}页
</span>
</ul>
</nav>
</div>
</div>
</body>
</html>
index.jsp：修改：
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