JavaWeb案例——用户信息管理系统

其他 2020-01-24 10:43:33 阅读次数: 0

文章目录

1. 需求分析

  1. 完成一个用户信息管理系统（基于 BS 架构），功能如下：

    • 分页展示用户信息
    • 添加用户信息
    • 删除用户信息（可以删除选中用户）
    • 修改用户信息（包括用户数据的回显）
    • 查询用户信息（可以输入条件，模糊查询）

  2. 效果图如下：

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2. 概要设计

2.1 技术选型

  • Tomcat 服务器
  • Servlet
  • JSP
  • Bootstrap
  • Mysql 数据库
  • Spring JDBC
  • Druid 连接池
  • BeanUtils

2.2 数据库设计

DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(20) NOT NULL,
  `gender` varchar(5) DEFAULT NULL,
  `age` int(11) DEFAULT NULL,
  `address` varchar(32) DEFAULT NULL,
  `qq` varchar(20) DEFAULT NULL,
  `email` varchar(50) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

2.3 分页展示用户功能设计

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2.4 添加用户功能设计

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2.5 删除用户功能设计

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2.6 删除选中用户功能设计

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2.7 修改用户功能设计

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2.8 查询用户功能设计

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3. 开发阶段

3.1 环境搭建

  1. 创建数据库环境

    1. 打开 Navicat，新建一个数据库 day17
    2. 创建 user 表（表的结构概要设计中已给出）

  2. 创建项目

    打开 IDEA，创建一个 Java EE 项目，Java EE version 为 Java EE 7，勾选 Web Application，不勾选 Create web.xml，项目名称为 day17_2

  3. 导入需要的 jar 包

    导入需要的 jar 包到 web/WEB-INF/lib 中，右键 Add as Library

    • commons-beanutils-1.8.3.jar
    • jstl-impl.jar
    • commons-logging-1.1.1.jar
    • spring-core-4.2.4.RELEASE.jar
    • spring-beans-4.2.4.RELEASE.jar
    • javax.servlet.jsp.jstl.jar
    • druid-1.0.9.jar
    • spring-jdbc-4.2.4.RELEASE.jar
    • mysql-connector-java-5.1.18-bin.jar
    • spring-tx-4.2.4.RELEASE.jar

  4. 创建配置文件

    在 src 下创建 Druid 配置文件 druid.properties

    driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql://127.0.0.1:3306/day17
username=root
password=123456
initialSize=5
maxActive=10
maxWait=3000

  5. 修改 Tomcat 配置

    1. 热部署：将 On ‘Update’ action 修改为 Redeploy 和 On frame deactivation 修改为 Update classes and resourses
    2. 修改端口号：将 HTTP Port 修改为 80
    3. 修改虚拟目录：将 Application context 修改为 /day17_2

3.2 前端代码

  1. 将 Bootstrap 相关的 css，fonts，js 三个文件夹复制到 web 目录下

  2. 首页 index.jsp

    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="utf-8"/>
  <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
  <meta name="viewport" content="width=device-width, initial-scale=1"/>
  <title>首页</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>
  <script type="text/javascript">
  </script>
</head>
<style>
  div{
    text-align: center;
  }
  a{
    font-size:33px;
  }
</style>
<body>
<div>
  <a
        href="${pageContext.request.contextPath}/FindUserByPageServlet">进入用户信息管理系统
  </a>
</div>
</body>
</html>

  3. 用户信息列表页面 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>
        h3 {
            text-align: center;
        }

        #search {
            float: left;
            margin: 10px;
        }

        #search div {
            margin-right: 5px;
        }

        #add_del {
            float: right;
            margin: 10px;
        }

        #add_del a {
            margin-left: 5px;
        }

        td, th {
            text-align: center;
        }

        #paging_info {
            font-size: 15px;
            margin-left: 10px;
            line-height: 35px;
        }
    </style>
    <script>
        function deleteUser(id) {
            //用户安全提示
            if (confirm("您确定要删除吗？")) {
                //访问路径
                location.href = "${pageContext.request.contextPath}/DelUserServlet?id=" + id;
            }
        }

        window.onload = function () {
            // 给删除选中按钮添加删除事件
            document.getElementById("delSelected").onclick = function () {
                if (confirm("您确定要删除吗？")) {
                    var flag = false;
                    // 判断是否有选中条目
                    var cbs = document.getElementsByName("id");
                    for (var i = 0; i < cbs.length; i++) {
                        if (cbs[i].checked) {
                            // 有一个条目选中了
                            flag = true;
                            break;
                        }
                    }
                    // 有条目被选中
                    if (flag) {
                        // 表单提交
                        document.getElementById("form").submit();
                    }
                }
            }

            // 全选按钮
            // 1.获取第一个 cb
            document.getElementById("firstCb").onclick = function () {
                //2.获取下边列表中所有的 cb
                var cbs = document.getElementsByName("id");
                //3.遍历
                for (var i = 0; i < cbs.length; i++) {
                    //4.设置这些cbs[i]的checked状态 = firstCb.checked
                    cbs[i].checked = this.checked;

                }

            }
        }
    </script>
</head>
<body>
<div class="container">
    <%--标题--%>
    <h3>用户信息列表</h3>

    <%--查询用户信息--%>
    <form id="search" 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="${condition.address[0]}" class="form-control" id="exampleInputName3">
        </div>
        <div class="form-group">
            <label for="exampleInputEmail2">Email</label>
            <input type="email" name="email" value="${condition.email[0]}" class="form-control" id="exampleInputEmail2">
        </div>
        <div class="form-group">
            <button type="submit" class="btn btn-default">查询</button>
        </div>
    </form>

    <%--增加和删除用户信息按钮--%>
    <div id="add_del">
        <a class="btn btn-primary" href="${pageContext.request.contextPath}/add.jsp">添加用户</a>
        <a class="btn btn-primary" href="javascript:void(0);" id="delSelected">删除选中</a>
    </div>
        
    <%--用户信息表单--%>
    <form id="form" action="${pageContext.request.contextPath}/DelSelectedServlet" method="post">
        <table border="1" class="table table-bordered table-hover">
            <tr class="success">
                <th><input type="checkbox" id="firstCb"></th>
                <th>编号</th>
                <th>姓名</th>
                <th>性别</th>
                <th>年龄</th>
                <th>籍贯</th>
                <th>QQ</th>
                <th>邮箱</th>
                <th>操作</th>
            </tr>
            <c:forEach items="${userByPage.list}" var="user" varStatus="s">
                <tr>
                    <td><input type="checkbox" name="id" 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>

    <%--分页--%>
    <nav>
        <ul class="pagination">
            <%--上一页--%>
            <c:if test="${userByPage.currentPage == 1}">
                <li class="disabled">
                    <a href="#" aria-label="Previous">
                        <span aria-hidden="true">&laquo;</span>
                    </a>
                </li>
            </c:if>
            <c:if test="${userByPage.currentPage != 1}">
                <li>
                    <a href="${pageContext.request.contextPath}/FindUserByPageServlet?currentPage=${userByPage.currentPage-1}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}"
                       aria-label="Previous">
                        <span aria-hidden="true">&laquo;</span>
                    </a>
                </li>
            </c:if>
            <%--第 n 页面--%>
            <c:forEach begin="1" end="${userByPage.totalPage}" step="1" var="i">
                <c:if test="${userByPage.currentPage == i}">
                    <li class="active">
                        <a href="${pageContext.request.contextPath}/FindUserByPageServlet?currentPage=${i}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}">${i}</a>
                    </li>
                </c:if>
                <c:if test="${userByPage.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>
            <%--下一页--%>
            <c:if test="${userByPage.currentPage == userByPage.totalPage}">
                <li class="disabled">
                    <a href="#" aria-label="Next">
                        <span aria-hidden="true">&raquo;</span>
                    </a>
                </li>
            </c:if>
            <c:if test="${userByPage.currentPage != userByPage.totalPage}">
                <li>
                    <a href="${pageContext.request.contextPath}/FindUserByPageServlet?currentPage=${userByPage.currentPage+1}&rows=5&&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}"
                       aria-label="Next">
                        <span aria-hidden="true">&raquo;</span>
                    </a>
                </li>
            </c:if>
            <%--分页信息--%>
            <span id="paging_info">共${userByPage.totalCount}条记录，共${userByPage.totalPage}页</span>
        </ul>
    </nav>
</div>
</body>
</html>

  4. 添加用户页面 add.jsp

    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!-- HTML5文档-->
<!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>添加用户</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>
        #add {
            width:400px;
        }
        h3 {
            text-align: center;
        }
        #btn {
            text-align: center;
        }
    </style>
</head>
<body>
<div class="container" id="add">
    <h3>添加用户</h3>

    <form action="${pageContext.request.contextPath}/AddUserServlet" method="post">
        <div class="form-group">
            <label for="name">姓名：</label>
            <input type="text" class="form-control" id="name" name="name" placeholder="请输入姓名">
        </div>

        <div class="form-group">
            <label>性别：</label>
            <input type="radio" name="gender" value="男" checked="checked"/>男
            <input type="radio" name="gender" value="女"/>女
        </div>

        <div class="form-group">
            <label for="age">年龄：</label>
            <input type="text" class="form-control" id="age" name="age" placeholder="请输入年龄">
        </div>

        <div class="form-group">
            <label for="address">籍贯：</label>
            <select name="address" class="form-control" id="address">
                <option value="北京">北京</option>
                <option value="上海">上海</option>
                <option value="广州">广州</option>
            </select>
        </div>

        <div class="form-group">
            <label for="qq">QQ：</label>
            <input type="text" class="form-control" id="qq" name="qq" placeholder="请输入QQ号码"/>
        </div>

        <div class="form-group">
            <label for="email">Email：</label>
            <input type="text" class="form-control" id="email" name="email" placeholder="请输入邮箱地址"/>
        </div>

        <div class="form-group" id="btn">
            <input class="btn btn-primary" type="submit" value="提交" />
            <input class="btn btn-default" type="reset" value="重置" />
            <a class="btn btn-default" href="${pageContext.request.contextPath}/FindUserByPageServlet">返回</a>
        </div>
    </form>
</div>
</body>
</html>

  5. 修改用户页面 update.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">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>修改用户</title>

    <link href="css/bootstrap.min.css" rel="stylesheet">
    <script src="js/jquery-2.1.0.min.js"></script>
    <script src="js/bootstrap.min.js"></script>

</head>
<style>
    #update {
        width:400px;
    }
    h3 {
        text-align: center;
    }
    #btn {
        text-align: center;
    }
</style>
<body>
<div class="container" id="update">
    <h3>修改用户</h3>
    <form action="${pageContext.request.contextPath}/UpdateUserServlet" method="post">
        <%--隐藏域提交 id--%>
        <input type="hidden" name="id" value="${user.id}">

        <div class="form-group">
            <label for="name">姓名：</label>
            <input type="text" class="form-control" id="name" name="name" value="${user.name}" readonly="readonly" placeholder="请输入姓名" />
        </div>

        <div class="form-group">
            <label>性别：</label>
            <c:if test="${user.gender == '男'}">
                <input type="radio" name="gender" value="男" checked />男
                <input type="radio" name="gender" value="女" />女
            </c:if>
            <c:if test="${user.gender == '女'}">
                <input type="radio" name="gender" value="男" />男
                <input type="radio" name="gender" value="女" checked />女
            </c:if>
        </div>

        <div class="form-group">
            <label for="age">年龄：</label>
            <input type="text" class="form-control" id="age"  name="age" value="${user.age}" placeholder="请输入年龄" />
        </div>

        <div class="form-group">
            <label for="address">籍贯：</label>
            <select name="address" class="form-control" id="address">
                <c:if test="${user.address == '北京'}">
                    <option value="北京" selected>北京</option>
                    <option value="上海">上海</option>
                    <option value="广州">广州</option>
                </c:if>
                <c:if test="${user.address == '上海'}">
                    <option value="北京">北京</option>
                    <option value="上海" selected>上海</option>
                    <option value="广州">广州</option>
                </c:if>
                <c:if test="${user.address == '广州'}">
                    <option value="北京">北京</option>
                    <option value="上海">上海</option>
                    <option value="广州" selected>广州</option>
                </c:if>
            </select>
        </div>

        <div class="form-group">
            <label for="qq">QQ：</label>
            <input type="text" class="form-control" id="qq" name="qq" value="${user.qq}" placeholder="请输入QQ号码"/>
        </div>

        <div class="form-group">
            <label for="email">Email：</label>
            <input type="text" class="form-control" id="email" name="email" value="${user.email}" placeholder="请输入邮箱地址"/>
        </div>

        <div class="form-group" id="btn">
            <input class="btn btn-primary" type="submit" value="提交" />
            <input class="btn btn-default" type="reset" value="重置" />
            <a class="btn btn-default" href="${pageContext.request.contextPath}/FindUserByPageServlet">返回</a>
        </div>
    </form>
</div>
</body>
</html>

3.3 后端代码

  1. 在 src 中创建 com.zt 包，在其中创建以下包：

    • utils
    • domain
    • dao
      • impl
    • service
      • impl
    • web
      • servlet

  2. utils 包

    • JDBCUtils

      package com.zt.utils;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

public class JDBCUtils {

    // 1.定义静态变量 dataSource
    private static DataSource dataSource;

    static {
        try {
            // 2.加载配置文件
            Properties properties = new Properties();
            InputStream resourceAsStream = JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties");
            properties.load(resourceAsStream);
            // 3.创建数据库连接池对象，并赋值给 dataSource
            dataSource = DruidDataSourceFactory.createDataSource(properties);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 获取连接池方法
     */
    public static DataSource getDataSource() {
        return dataSource;
    }

    /**
     * 通过数据库连接池获取连接对象
     */
    public static Connection getConnection() throws SQLException {
        return dataSource.getConnection();
    }

    /**
     * 释放资源
     */
    public static void close(ResultSet resultSet, Statement statement, Connection connection) {
        if (resultSet != null) {
            try {
                resultSet.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (statement != null) {
            try {
                statement.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (connection != null) {
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public static void close(Statement statement, Connection connection) {
        close(null, statement, connection);
    }


}

  3. domain 包

    • User

      package com.zt.domain;

/**
 * 用户对象
 */
public class User {
    private int id;
    private String name;
    private String gender;
    private int age;
    private String address;
    private String qq;
    private String email;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getQq() {
        return qq;
    }

    public void setQq(String qq) {
        this.qq = qq;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", gender='" + gender + '\'' +
                ", age=" + age +
                ", address='" + address + '\'' +
                ", qq='" + qq + '\'' +
                ", email='" + email + '\'' +
                '}';
    }


}

    • PageBean

      package com.zt.domain;

import java.util.List;

/**
 * 分页对象
 */
public class PageBean<T> {
    private int totalCount; // 总记录数
    private int totalPage; // 总页码数
    private int currentPage; // 当前页码
    private int rows; // 每页显示的条数
    private List<T> list; // 每页的数据

    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 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;
    }

    public List<T> getList() {
        return list;
    }

    public void setList(List<T> list) {
        this.list = list;
    }

    @Override
    public String toString() {
        return "PageBean{" +
                "totalCount=" + totalCount +
                ", totalPage=" + totalPage +
                ", currentPage=" + currentPage +
                ", rows=" + rows +
                ", list=" + list +
                '}';
    }
}

  4. dao 包

    • UserDao

      package com.zt.dao;

import com.zt.domain.User;

import java.util.List;
import java.util.Map;

public interface UserDao {

    /**
     * 添加用户信息
      * @param user
     */
    public void add(User user);

    /**
     * 删除用户信息
     * @param id
     */
    public void delete(int id);

    /**
     * 查询用户信息
     * @param id
     * @return
     */
    public User find(int id);

    /**
     * 更新用户信息
     * @param user
     */
    public void update(User user);

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

    /**
     * 分页条件查询用户信息
     * @param start
     * @param rows
     * @param condition
     * @return
     */
    public List<User> findByPage(int start, int rows, Map<String, String[]> condition);
}

    • UserDaoImpl

      package com.zt.dao.impl;

import com.zt.dao.UserDao;
import com.zt.domain.User;
import com.zt.utils.JDBCUtils;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class UserDaoImpl implements UserDao {
    // 使用 Spring JDBC 操作数据库
    private JdbcTemplate jdbcTemplate = new JdbcTemplate(JDBCUtils.getDataSource());

    @Override
    public void add(User user) {
        String sql = "insert into user values(null,?,?,?,?,?,?)";
        jdbcTemplate.update(sql,user.getName(),user.getGender(),user.getAge(),user.getAddress(),user.getQq(),user.getEmail());
    }

    @Override
    public void delete(int id) {
        String sql = "delete from user where id = ?";
        jdbcTemplate.update(sql,id);
    }

    @Override
    public User find(int id) {
        String sql = "select * from user where id = ?";
        User user = jdbcTemplate.queryForObject(sql, new BeanPropertyRowMapper<User>(User.class), id);
        return user;
    }

    @Override
    public void update(User user) {
        String sql = "update user set name = ?, gender = ?, age = ?, address = ?, qq = ?, email = ? where id = ?";
        jdbcTemplate.update(sql,user.getName(),user.getGender(),user.getAge(),user.getAddress(),user.getQq(),user.getEmail(),user.getId());
    }

    @Override
    public int findTotalCount(Map<String, String[]> condition) {
        // 1.定义初始化 sql，注意 sql语句后加空格
        String sql = "select count(*) from user where 1 = 1 ";
        StringBuilder stringBuilder = new StringBuilder(sql);
        // 2.定义参数的集合 params
        List<Object> params = new ArrayList<Object>();
        // 3.遍历 condition
        Set<String> keySet = condition.keySet();
        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)){
                // 给 sql 附加条件语句，注意 sql语句前后加空格
                stringBuilder.append(" And " + key +" like ? ");
                // 将 value 放入 params 集合
                params.add("%"+value+"%");
            }
        }

        return jdbcTemplate.queryForObject(stringBuilder.toString(), Integer.class, params.toArray());
    }

    @Override
    public List<User> findByPage(int start, int rows, Map<String, String[]> condition) {
        // 1.定义初始化 sql，注意 sql语句后加空格
        String sql = "select * from user where 1 = 1 ";
        StringBuilder stringBuilder = new StringBuilder(sql);
        // 2.定义参数的集合 params
        List<Object> params = new ArrayList<Object>();
        // 3.遍历 condition
        Set<String> keySet = condition.keySet();
        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)){
                // 给 sql 附加条件语句，注意 sql语句前后加空格
                stringBuilder.append(" And " + key +" like ? ");
                // 将 value 放入 params 集合
                params.add("%"+value+"%");
            }
        }
        // 4.添加分页条件
        stringBuilder.append(" limit ?,? ");
        // 5.添加分页条件参数值
        params.add(start);
        params.add(rows);

        return jdbcTemplate.query(stringBuilder.toString(), new BeanPropertyRowMapper<User>(User.class), params.toArray());
    }
}

  5. service 包

    • UserService

      package com.zt.service;

import com.zt.domain.PageBean;
import com.zt.domain.User;

import java.util.Map;

public interface UserService {

    /**
     * 添加用户信息
     * @param user
     */
    public void addUser(User user);

    /**
     * 删除用户信息
     * @param id
     */
    public void deleteUser(String id);

    /**
     * 查询用户信息
     * @param id
     */
    public User findUser(String id);

    /**
     * 更新用户信息
     * @param user
     */
    public void updateUser(User user);

    /**
     * 分页条件查询用户信息
     * @param currentPage
     * @param rows
     * @param condition
     * @return
     */
    public PageBean<User> findUserByPage(String currentPage, String rows, Map<String, String[]> condition);

}

    • UserServiceImpl

      package com.zt.service.impl;

import com.zt.dao.UserDao;
import com.zt.dao.impl.UserDaoImpl;
import com.zt.domain.PageBean;
import com.zt.domain.User;
import com.zt.service.UserService;

import java.util.List;
import java.util.Map;

public class UserServiceImpl implements UserService {
    // 调用 UserDaoImpl 来实现业务逻辑
    private UserDao userDao = new UserDaoImpl();

    @Override
    public void addUser(User user) {
        userDao.add(user);
    }

    @Override
    public void deleteUser(String id) {
        userDao.delete(Integer.parseInt(id));
    }

    @Override
    public User findUser(String id) {
        return userDao.find(Integer.parseInt(id));
    }

    @Override
    public void updateUser(User user) {
        userDao.update(user);
    }

    @Override
    public PageBean<User> findUserByPage(String currentPage, String rows, Map<String, String[]> condition) {
        int currentPage1 = Integer.parseInt(currentPage);
        int rows1 = Integer.parseInt(rows);
        // 1.创建一个空的 PageBean 对象
        PageBean<User> userPageBean = new PageBean<>();
        // 2.设置属性
        userPageBean.setCurrentPage(currentPage1);
        userPageBean.setRows(rows1);
        // 3.调用 dao 查询总记录数
        int totalCount = userDao.findTotalCount(condition);
        userPageBean.setTotalCount(totalCount);
        // 4.调用 dao 查询 list 集合
        // 计算开始的记录索引
        int start = (currentPage1 - 1) * rows1;
        List<User> byPage = userDao.findByPage(start, rows1, condition);
        userPageBean.setList(byPage);
        // 5.计算总页码数
        int totalPage = totalCount % rows1 == 0 ?  totalCount/rows1 : totalCount/rows1 + 1;
        userPageBean.setTotalPage(totalPage);

        return userPageBean;
    }
}

  6. servlet 包

    • FindUserByPageServlet

      package com.zt.web.servlet;

import com.zt.domain.PageBean;
import com.zt.domain.User;
import com.zt.service.UserService;
import com.zt.service.impl.UserServiceImpl;

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 java.io.IOException;
import java.util.Map;

@WebServlet("/FindUserByPageServlet")
public class FindUserByPageServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 1.设置编码
        request.setCharacterEncoding("utf-8");
        // 2.获取参数
        String currentPage = request.getParameter("currentPage"); // 当前页码
        String rows = request.getParameter("rows"); // 每页显示条数
        Map<String, String[]> condition = request.getParameterMap();

        // 3.参数为空的情况
        if(currentPage == null || "".equals(currentPage)) {
            currentPage = "1";
        }
        if(rows == null || "".equals(rows)) {
            rows = "5";
        }

        // 4.调用 UserService 完成查询
        UserService userService = new UserServiceImpl();
        PageBean<User> userByPage = userService.findUserByPage(currentPage, rows, condition);
        // 5.将 userByPage 存入 request
        request.setAttribute("userByPage",userByPage);
        // 6.将 condition 存入 request
        request.setAttribute("condition",condition);
        // 7.转发到 list.jsp
        request.getRequestDispatcher("/list.jsp").forward(request,response);

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

    • AddUserServlet

      package com.zt.web.servlet;

import com.zt.domain.User;
import com.zt.service.UserService;
import com.zt.service.impl.UserServiceImpl;
import org.apache.commons.beanutils.BeanUtils;

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 java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.List;
import java.util.Map;

@WebServlet("/AddUserServlet")
public class AddUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 1.设置编码
        request.setCharacterEncoding("utf-8");
        // 2.获取参数
        Map<String, String[]> parameterMap = request.getParameterMap();
        // 3.封装对象
        User user = new User();
        try {
            BeanUtils.populate(user,parameterMap);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
        // 4.调用 UserService 完成添加
        UserService userService = new UserServiceImpl();
        userService.addUser(user);

        //5.重定向到 FindUserByPageServlet
        response.sendRedirect(request.getContextPath()+"/FindUserByPageServlet");
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

    • DelUserServlet

      package com.zt.web.servlet;

import com.zt.service.UserService;
import com.zt.service.impl.UserServiceImpl;

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 java.io.IOException;

@WebServlet("/DelUserServlet")
public class DelUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 1.获取参数
        String id = request.getParameter("id");
        // 2.调用 UserService 完成删除
        UserService userService = new UserServiceImpl();
        userService.deleteUser(id);
        // 3.重定向到 FindUserByPageServlet
        response.sendRedirect(request.getContextPath()+"/FindUserByPageServlet");
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

    • DelSelectedServlet

      package com.zt.web.servlet;

import com.zt.service.UserService;
import com.zt.service.impl.UserServiceImpl;

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 java.io.IOException;

@WebServlet("/DelSelectedServlet")
public class DelSelectedServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 1.获取参数
        String[] ids = request.getParameterValues("id");
        // 2.调用 UserService 完成删除
        UserService userService = new UserServiceImpl();
        for (String id : ids) {
            userService.deleteUser(id);
        }
        // 3.重定向到 FindUserByPageServlet
        response.sendRedirect(request.getContextPath()+"/FindUserByPageServlet");

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

    • FindUserServlet

      package com.zt.web.servlet;

import com.zt.domain.User;
import com.zt.service.UserService;
import com.zt.service.impl.UserServiceImpl;

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 java.io.IOException;

@WebServlet("/FindUserServlet")
public class FindUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 1.获取参数
        String id = request.getParameter("id");
        // 2.调用 UserService 完成查询
        UserService userService = new UserServiceImpl();
        User user = userService.findUser(id);
        // 3.将 user 存入 request
        request.setAttribute("user",user);
        // 4.转发到 update.jsp
        request.getRequestDispatcher("/update.jsp").forward(request,response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

    • UpdateUserServlet

      package com.zt.web.servlet;

import com.zt.domain.User;
import com.zt.service.UserService;
import com.zt.service.impl.UserServiceImpl;
import org.apache.commons.beanutils.BeanUtils;

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 java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;

@WebServlet("/UpdateUserServlet")
public class UpdateUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 1.设置编码
        request.setCharacterEncoding("utf-8");
        // 2.获取参数
        Map<String, String[]> parameterMap = request.getParameterMap();
        // 3.封装对象
        User user = new User();
        try {
            BeanUtils.populate(user,parameterMap);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
        // 4.调用 UserService 完成修改
        UserService userService = new UserServiceImpl();
        userService.updateUser(user);

        //5.重定向到 FindUserByPageServlet
        response.sendRedirect(request.getContextPath()+"/FindUserByPageServlet");
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}
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