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用户信息分页查询功能

时间:2022-08-17 15:16:49浏览次数:49  
标签:rows 分页 int list 用户 查询 totalCount currentPage public

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">&laquo;</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">&raquo;</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>&nbsp;
                        <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">&laquo;</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">&raquo;</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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标签:rows,分页,int,list,用户,查询,totalCount,currentPage,public
From: https://www.cnblogs.com/pengtianyang/p/16595249.html

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