用户信息复杂条件查询功能

用户信息复杂条件查询功能

分析：

 

 

UserDao进行改造：加了一个 Map<String, String[]> condition

    /**
     * 查询总记录数
     * @return
     * @param condition
     */
    int findTotalCount(Map<String, String[]> condition);

    /**
     * 分页查询每页记录
     * @param start
     * @param rows
     * @param condition
     * @return
     */
    List<User> findByPage(int start, int rows, Map<String, String[]> condition);

UserDaoImpl进行改造：注意1 = 1 和 有值后拼接的空格 " and "+key+" like ? " 要不拼接sql 的时候会出现错误 (1and....)不正确的SQL

    @Override
    public int findTotalCount(Map<String, String[]> condition) {
        //定义模板初始化sql
        String sql = "select count(*) from user where 1 = 1 ";
        StringBuilder sb = new StringBuilder(sql);
        //遍历map
        Set<String> keySet = condition.keySet();
        //定义参数的集合
        List<Object> params = new ArrayList<Object>();
        for (String key : keySet) {
            //排除分页条件参数
            if ("currentPage".equals(key) || "rows".equals(key)){
                continue;
            }
            //获取value
            String value = condition.get(key)[0];
            //判断value是否有值
            if (value !=null && !"".equals(value)){
                //有值
                sb.append(" and "+key+" like ? ");
                params.add("%"+value+"%");//加条件的值
            }
        }

        return template.queryForObject(sb.toString(),Integer.class,params.toArray());
    }

    @Override
    public List<User> findByPage(int start, int rows, Map<String, String[]> condition) {
        String sql = "select * from user where 1=1";
        StringBuilder sb = new StringBuilder(sql);
        //遍历map
        Set<String> keySet = condition.keySet();
        //定义参数的集合
        List<Object> params = new ArrayList<Object>();
        for (String key : keySet) {
            //排除分页条件参数
            if ("currentPage".equals(key) || "rows".equals(key)){
                continue;
            }
            //获取value
            String value = condition.get(key)[0];
            //判断value是否有值
            if (value !=null && !"".equals(value)){
                //有值
                sb.append(" and "+key+" like ? ");
                params.add("%"+value+"%");//加条件的值
            }
        }
        //添加分页查询
        sb.append(" limit ?,? ");
        //添加分页查询参数值
        params.add(start);
        params.add(rows);
        return template.query(sb.toString(),new BeanPropertyRowMapper<User>(User.class),params.toArray());
    }

UserService改造：

    /**
     * 分页条件查询
     * @param _currentPage
     * @param _rows
     * @param condition
     * @return
     */
    PageBean<User> findUserByPage(String _currentPage, String _rows, Map<String, String[]> condition);

UserServiceImpl改造：

    @Override
    public PageBean<User> findUserByPage(String _currentPage, String _rows, Map<String, String[]> condition) {
        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(condition);
        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,condition);
        pb.setList(list);


        pb.setTotalPage(totalPage);

        return pb;
    }

FindUserByPageServlet改造：

@WebServlet("/findUserByPageServlet")
public class FindUserByPageServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        //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";
        }

        //获取条件查询参数
        Map<String, String[]> condition = request.getParameterMap();


        //调用service查询
        UserServiceImpl service = new UserServiceImpl();
        PageBean<User> pb = service.findUserByPage(currentPage,rows,condition);
        //将PageBean存入request
        request.setAttribute("pb",pb);

        request.setAttribute("condition",condition);//将查询条件存入request

        //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改造：

 

 

 

页面：

<%@ 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" action="${pageContext.request.contextPath}/findUserByPageServlet" method="post">
            <div class="form-group">
                <label for="exampleInputName2">姓名</label>
                <input type="text" name="name" value="${condition.name[0]}" class="form-control" id="exampleInputName2">
            </div>
            <div class="form-group">
                <label for="exampleInputName3">籍贯</label>
                <input type="text" name="address" value="${condition.address[0]}" class="form-control" id="exampleInputName3">
            </div>
            <div class="form-group">
                <label for="exampleInputEmail2">邮箱</label>
                <input type="text" name="email" value="${condition.elail[0]}" 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&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}}" aria-label="Previous">
                        <span aria-hidden="true">&laquo;</span>
                    </a>
                </li>
                <c:forEach begin="1" end="${pb.totalPage}" var="i">
                    <c:if test="${pb.currentPage == i}">
                        <li class="active"><a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${i}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}">${i}</a></li>
                    </c:if>
                    <c:if test="${pb.currentPage != i}">
                        <li><a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${i}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}">${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&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}" aria-label="Next">
                        <span aria-hidden="true">&raquo;</span>
                    </a>
                </li>
                <span style="font-size: 25px;margin-left: 5px">
                    共${pb.totalCount}条记录，共${pb.totalPage}页
                </span>
            </ul>
        </nav>
    </div>
</div>
</body>
</html>

 

 

搜索

复制