1.模塊要求
1. 簡單功能
1. 列表查詢
2. 登錄
3. 添加
4. 刪除
5. 修改
2. 複雜功能
1. 刪除選中
2. 分頁查詢
好處:
1. 減輕服務器內存的開銷
2. 提升用戶體驗
3. 複雜條件查詢
2.數據庫設計
如下圖
3.實現的代碼
Github地址:點擊跳轉到github獲取完整代碼
idea開發的
3.1前端的頁面代碼
==登錄頁面:login.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>管理員登錄</title>
<!-- 1. 導入CSS的全局樣式 -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- 2. jQuery導入,建議使用1.9以上的版本 -->
<script src="js/jquery-2.1.0.min.js"></script>
<!-- 3. 導入bootstrap的js文件 -->
<script src="js/bootstrap.min.js"></script>
<script type="text/javascript">
//切換驗證碼
function refreshCode(){
//1.獲取驗證碼圖片對象
var vcode = document.getElementById("vcode");
//2.設置其src屬性,加時間戳
vcode.src = "${pageContext.request.contextPath}/checkCodeServlet?time="+new Date().getTime();
}
</script>
</head>
<body>
<div class="container" style="width: 400px;">
<h3 style="text-align: center;">管理員登錄</h3>
<form action="${pageContext.request.contextPath}/loginServlet" method="post">
<div class="form-group">
<label for="user">用戶名:</label>
<input type="text" name="username" class="form-control" id="user" placeholder="請輸入用戶名"/>
</div>
<div class="form-group">
<label for="password">密碼:</label>
<input type="password" name="password" class="form-control" id="password" placeholder="請輸入密碼"/>
</div>
<div class="form-inline">
<label for="vcode">驗證碼:</label>
<input type="text" name="verifycode" class="form-control" id="verifycode" placeholder="請輸入驗證碼" style="width: 120px;"/>
<a href="javascript:refreshCode();">
<img src="${pageContext.request.contextPath}/checkCodeServlet" title="看不清點擊刷新" id="vcode"/>
</a>
</div>
<hr/>
<div class="form-group" style="text-align: center;">
<input class="btn btn btn-primary" type="submit" value="登錄">
</div>
</form>
<!-- 出錯顯示的信息框 -->
<div class="alert alert-warning alert-dismissible" role="alert">
<button type="button" class="close" data-dismiss="alert" >
<span>×</span>
</button>
<strong>${login_msg}</strong>
</div>
</div>
</body>
</html>
-------------------------------------------------------------------------------------------------
==歡迎頁面:index.jsp==
<%--
Created by IntelliJ IDEA.
User: Belief
Date: 2020/5/28
Time: 22:47
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!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>首頁</title>
<!-- 1. 導入CSS的全局樣式 -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- 2. jQuery導入,建議使用1.9以上的版本 -->
<script src="js/jquery-2.1.0.min.js"></script>
<!-- 3. 導入bootstrap的js文件 -->
<script src="js/bootstrap.min.js"></script>
<script type="text/javascript">
</script>
</head>
<body>
<div >${user.name},歡迎您</div>
<div align="center">
<a
href="${pageContext.request.contextPath}/findUserByPageServlet" style="text-decoration:none;font-size:33px">查詢所有用戶信息
</a>
</div>
</body>
</html>
-------------------------------------------------------------------------------------------------
==表單頁面:list.jsp==
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<
<!DOCTYPE html>
<!-- 網頁使用的語言 -->
<html lang="zh-CN">
<head>
<!-- 指定字符集 -->
<meta charset="utf-8">
<!-- 使用Edge最新的瀏覽器的渲染方式 -->
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<!-- viewport視口:網頁可以根據設置的寬度自動進行適配,在瀏覽器的內部虛擬一個容器,容器的寬度與設備的寬度相同。
width: 默認寬度與設備的寬度相同
initial-scale: 初始的縮放比,爲1:1 -->
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- 上述3個meta標籤*必須*放在最前面,任何其他內容都*必須*跟隨其後! -->
<title>用戶信息管理系統</title>
<!-- 1. 導入CSS的全局樣式 -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- 2. jQuery導入,建議使用1.9以上的版本 -->
<script src="js/jquery-2.1.0.min.js"></script>
<!-- 3. 導入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){
//用戶安全提示
if(confirm("您確定要刪除嗎?")){
//訪問路徑
location.href="${pageContext.request.contextPath}/delUserServlet?id="+id;
}
}
window.onload = function(){
//給刪除選中按鈕添加單擊事件
document.getElementById("delSelected").onclick = function(){
if(confirm("您確定要刪除選中條目嗎?")){
var flag = false;
//判斷是否有選中條目
var cbs = document.getElementsByName("uid");
for (var i = 0; i < cbs.length; i++) {
if(cbs[i].checked){
//有一個條目選中了
flag = true;
break;
}
}
if(flag){//有條目被選中
//表單提交
document.getElementById("form").submit();
}
}
}
//1.獲取第一個cb
document.getElementById("firstCb").onclick = function(){
//2.獲取下邊列表中所有的cb
var cbs = document.getElementsByName("uid");
//3.遍歷
for (var i = 0; i < cbs.length; i++) {
//4.設置這些cbs[i]的checked狀態 = firstCb.checked
cbs[i].checked = this.checked;
}
}
}
</script>
</head>
<body>
<div class="container">
<h3 style="text-align: center">用戶信息列表</h3>
<div style="float: left;">
<form class="form-inline" action="${pageContext.request.contextPath}/findUserByPageServlet" method="post">
<div class="form-group">
<label for="exampleInputName2">姓名</label>
<input type="text" name="name" value="${condition.name[0]}" class="form-control" id="exampleInputName2" >
</div>
<div class="form-group">
<label for="exampleInputName3">籍貫</label>
<input type="text" name="address" value="${condition.address[0]}" class="form-control" id="exampleInputName3" >
</div>
<div class="form-group">
<label for="exampleInputEmail2">郵箱</label>
<input type="text" name="email" value="${condition.email[0]}" class="form-control" id="exampleInputEmail2" >
</div>
<button type="submit" class="btn btn-default">查詢</button>
</form>
</div>
<div style="float: right;margin: 5px;">
<a class="btn btn-primary" href="${pageContext.request.contextPath}/add.jsp">添加聯繫人</a>
<a class="btn btn-primary" href="javascript:void(0);" id="delSelected">刪除選中</a>
</div>
<form id="form" action="${pageContext.request.contextPath}/delSelectedServlet" method="post">
<table border="1" class="table table-bordered table-hover">
<tr class="success">
<th><input type="checkbox" id="firstCb"></th>
<th>編號</th>
<th>姓名</th>
<th>性別</th>
<th>年齡</th>
<th>籍貫</th>
<th>QQ</th>
<th>郵箱</th>
<th>操作</th>
</tr>
<c:forEach items="${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(${user.id});">刪除</a></td>
</tr>
</c:forEach>
</table>
</form>
<div>
<nav aria-label="Page navigation">
<ul class="pagination">
<c:if test="${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">«</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]}">${i}</a></li>
</c:if>
</c:forEach>
<li>
<a href="${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">»</span>
</a>
</li>
<span style="font-size: 25px;margin-left: 5px;">
共${pb.totalCount}條記錄,共${pb.totalPage}頁
</span>
</ul>
</nav>
</div>
</div>
</body>
</html>
-------------------------------------------------------------------------------------------------
==增加數據的頁面:add.jsp==
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!-- HTML5文檔-->
<!DOCTYPE html>
<!-- 網頁使用的語言 -->
<html lang="zh-CN">
<head>
<!-- 指定字符集 -->
<meta charset="utf-8">
<!-- 使用Edge最新的瀏覽器的渲染方式 -->
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<!-- viewport視口:網頁可以根據設置的寬度自動進行適配,在瀏覽器的內部虛擬一個容器,容器的寬度與設備的寬度相同。
width: 默認寬度與設備的寬度相同
initial-scale: 初始的縮放比,爲1:1 -->
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- 上述3個meta標籤*必須*放在最前面,任何其他內容都*必須*跟隨其後! -->
<title>添加用戶</title>
<!-- 1. 導入CSS的全局樣式 -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- 2. jQuery導入,建議使用1.9以上的版本 -->
<script src="js/jquery-2.1.0.min.js"></script>
<!-- 3. 導入bootstrap的js文件 -->
<script src="js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<center><h3>添加聯繫人頁面</h3></center>
<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="請輸入姓名">
</div>
<div class="form-group">
<label>性別:</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">年齡:</label>
<input type="text" class="form-control" id="age" name="age" placeholder="請輸入年齡">
</div>
<div class="form-group">
<label for="address">籍貫:</label>
<select name="address" class="form-control" id="address">
<option value="陝西">陝西</option>
<option value="北京">北京</option>
<option value="上海">上海</option>
</select>
</div>
<div class="form-group">
<label for="qq">QQ:</label>
<input type="text" class="form-control" id="qq" name="qq" placeholder="請輸入QQ號碼"/>
</div>
<div class="form-group">
<label for="email">Email:</label>
<input type="text" class="form-control" id="email" name="email" placeholder="請輸入郵箱地址"/>
</div>
<div class="form-group" style="text-align: center">
<input class="btn btn-primary" type="submit" value="提交" />
<input class="btn btn-default" type="reset" value="重置" />
<input class="btn btn-default" type="button" value="返回" />
</div>
</form>
</div>
</body>
</html>
-------------------------------------------------------------------------------------------------
==修改數據的頁面:update.jsp==
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<!-- 網頁使用的語言 -->
<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>修改用戶</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>
<script >
window.onload=function(){
document.getElementById("back").onclick=function(){
location.href="${pageContext.request.contextPath}/findUserByPageServlet";
}
}
</script>
</head>
<body>
<div class="container" style="width: 400px;">
<h3 style="text-align: center;">修改聯繫人</h3>
<form action="${pageContext.request.contextPath}/updateUserServlet" method="post">
<!-- 隱藏域 提交id-->
<input type="hidden" name="id" value="${user.id}">
<div class="form-group">
<label for="name">姓名:</label>
<input type="text" class="form-control" id="name" name="name" value="${user.name}" readonly="readonly" placeholder="請輸入姓名" />
</div>
<div class="form-group">
<label>性別:</label>
<c:if test="${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="${user.gender == '女'}">
<input type="radio" name="gender" value="男" />男
<input type="radio" name="gender" value="女" checked />女
</c:if>
</div>
<div class="form-group">
<label for="age">年齡:</label>
<input type="text" class="form-control" value="${user.age}" id="age" name="age" placeholder="請輸入年齡" />
</div>
<div class="form-group">
<label for="address">籍貫:</label>
<select name="address" id="address" class="form-control" >
<c:if test="${user.address == '陝西'}">
<option value="陝西" selected>陝西</option>
<option value="北京">北京</option>
<option value="上海">上海</option>
</c:if>
<c:if test="${user.address == '北京'}">
<option value="陝西" >陝西</option>
<option value="北京" selected>北京</option>
<option value="上海">上海</option>
</c:if>
<c:if test="${user.address == '上海'}">
<option value="陝西" >陝西</option>
<option value="北京">北京</option>
<option value="上海" selected>上海</option>
</c:if>
</select>
</div>
<div class="form-group">
<label for="qq">QQ:</label>
<input type="text" id="qq" class="form-control" value="${user.qq}" name="qq" placeholder="請輸入QQ號碼"/>
</div>
<div class="form-group">
<label for="email">Email:</label>
<input type="text" id="email" class="form-control" value="${user.email}" name="email" placeholder="請輸入郵箱地址"/>
</div>
<div class="form-group" style="text-align: center">
<input class="btn btn-primary" type="submit" value="提交" />
<input class="btn btn-default" type="reset" value="重置" />
<input id="back" class="btn btn-default" type="button" value="返回" />
</div>
</form>
</div>
</body>
</html>
js、css、fonts、還有jar包我就不展示了文件
數據庫的連接和封裝看另外兩篇博客,包括增刪改查
地址:基本的封裝
Druid數據庫連接池技術
3.2User實體類
package Per.Belief.domain;
public class User {
private int id;
private String name;
private String gender;
private int age;
private String address;
private String qq;
private String email;
private String username;
private String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
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 + '\'' +
", username='" + username + '\'' +
", password='" + password + '\'' +
'}';
}
}
3.3PageBean
package Per.Belief.domain;
import java.util.List;
/**
* 分頁對象
*/
public class PageBean<T> {
private int totalCount; // 總記錄數
private int totalPage ; // 總頁碼
private List<T> list ; // 每頁的數據
private int currentPage ; //當前頁碼
private int rows;//每頁顯示的記錄數
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 +
'}';
}
}
3.4UserDao
package Per.Belief.dao;
import Per.Belief.domain.User;
import java.util.List;
import java.util.Map;
/**
* 用戶操作的DAO
*/
public interface UserDao {
public List<User> findAll();
User findUserByUsernameAndPassword(String username, String password);
void add(User user);
void delete(int id);
User findById(int i);
void update(User user);
/**
* 查詢總記錄數
* @return
* @param condition
*/
int findTotalCount(Map<String, String[]> condition);
/**
* 分頁查詢每頁記錄
* @param start
* @param rows
* @param condition
* @return
*/
List<User> findByPage(int start, int rows, Map<String, String[]> condition);
}
UserDaoImpl
package Per.Belief.dao.impl;
import Per.Belief.dao.UserDao;
import Per.Belief.domain.User;
import Per.Belief.util.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 {
private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());
@Override
public List<User> findAll() {
//使用JDBC操作數據庫...
//1.定義sql
String sql = "select * from tb_infor";
List<User> users = template.query(sql, new BeanPropertyRowMapper<User>(User.class));
return users;
}
@Override
public User findUserByUsernameAndPassword(String username, String password) {
try {
String sql = "select * from tb_infor where username = ? and password = ?";
User user = template.queryForObject(sql, new BeanPropertyRowMapper<User>(User.class), username, password);
return user;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
@Override
public void add(User user) {
//1.定義sql
String sql = "insert into tb_infor values(null,?,?,?,?,?,?,null,null)";
//2.執行sql
template.update(sql, user.getName(), user.getGender(), user.getAge(), user.getAddress(), user.getQq(), user.getEmail());
}
@Override
public void delete(int id) {
//1.定義sql
String sql = "delete from tb_infor where id = ?";
//2.執行sql
template.update(sql, id);
}
@Override
public User findById(int id) {
String sql = "select * from tb_infor where id = ?";
return template.queryForObject(sql, new BeanPropertyRowMapper<User>(User.class), id);
}
@Override
public void update(User user) {
String sql = "update tb_infor set name = ?,gender = ? ,age = ? , address = ? , qq = ?, email = ? where id = ?";
template.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.定義模板初始化sql
String sql = "select count(*) from tb_infor where 1 = 1 ";
StringBuilder sb = new StringBuilder(sql);
//2.遍歷map
Set<String> keySet = condition.keySet();
//定義參數的集合
List<Object> params = new ArrayList<Object>();
for (String key : keySet) {
//排除分頁條件參數
if("currentPage".equals(key) || "rows".equals(key)){
continue;
}
//獲取value
String value = condition.get(key)[0];
//判斷value是否有值
if(value != null && !"".equals(value)){
//有值
sb.append(" and "+key+" like ? ");
params.add("%"+value+"%");//?條件的值
}
}
System.out.println(sb.toString());
System.out.println(params);
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 tb_infor where 1 = 1 ";
StringBuilder sb = new StringBuilder(sql);
//2.遍歷map
Set<String> keySet = condition.keySet();
//定義參數的集合
List<Object> params = new ArrayList<Object>();
for (String key : keySet) {
//排除分頁條件參數
if("currentPage".equals(key) || "rows".equals(key)){
continue;
}
//獲取value
String value = condition.get(key)[0];
//判斷value是否有值
if(value != null && !"".equals(value)){
//有值
sb.append(" and "+key+" like ? ");
params.add("%"+value+"%");//?條件的值
}
}
//添加分頁查詢
sb.append(" limit ?,? ");
//添加分頁查詢參數值
params.add(start);
params.add(rows);
sql = sb.toString();
System.out.println(sql);
System.out.println(params);
return template.query(sql,new BeanPropertyRowMapper<User>(User.class),params.toArray());
}
}
UserService
package Per.Belief.service;
import Per.Belief.domain.PageBean;
import Per.Belief.domain.User;
import java.util.List;
import java.util.Map;
/**
* 用戶管理的業務接口
*/
public interface UserService {
/**
* 查詢所有用戶信息
* @return
*/
public List<User> findAll();
/**
* 登錄方法
* @param user
* @return
*/
User login(User user);
/**
* 保存User
* @param user
*/
void addUser(User user);
/**
* 根據id刪除User
* @param id
*/
void deleteUser(String id);
/**
* 根據id查詢
* @param id
* @return
*/
User findUserById(String id);
/**
* 修改用戶信息
* @param user
*/
void updateUser(User user);
/**
* 批量刪除用戶
* @param ids
*/
void delSelectedUser(String[] ids);
/**
* 分頁條件查詢
* @param currentPage
* @param rows
* @param condition
* @return
*/
PageBean<User> findUserByPage(String currentPage, String rows, Map<String, String[]> condition);
}
UserServiceImpl
package Per.Belief.service.impl;
import Per.Belief.dao.UserDao;
import Per.Belief.dao.impl.UserDaoImpl;
import Per.Belief.domain.PageBean;
import Per.Belief.domain.User;
import Per.Belief.service.UserService;
import java.util.List;
import java.util.Map;
public class UserServiceImpl implements UserService {
private UserDao dao = new UserDaoImpl();
@Override
public List<User> findAll() {
//調用Dao完成查詢
return dao.findAll();
}
@Override
public User login(User user) {
return dao.findUserByUsernameAndPassword(user.getUsername(),user.getPassword());
}
@Override
public void addUser(User user) {
dao.add(user);
}
@Override
public void deleteUser(String id) {
dao.delete(Integer.parseInt(id));
}
@Override
public User findUserById(String id) {
return dao.findById(Integer.parseInt(id));
}
@Override
public void updateUser(User user) {
dao.update(user);
}
@Override
public void delSelectedUser(String[] ids) {
if(ids != null && ids.length > 0){
//1.遍歷數組
for (String id : ids) {
//2.調用dao刪除
dao.delete(Integer.parseInt(id));
}
}
}
@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 <=0) {
currentPage = 1;
}
//1.創建空的PageBean對象
PageBean<User> pb = new PageBean<User>();
//2.設置參數
pb.setCurrentPage(currentPage);
pb.setRows(rows);
//3.調用dao查詢總記錄數
int totalCount = dao.findTotalCount(condition);
pb.setTotalCount(totalCount);
//4.調用dao查詢List集合
//計算開始的記錄索引
int start = (currentPage - 1) * rows;
List<User> list = dao.findByPage(start,rows,condition);
pb.setList(list);
//5.計算總頁碼
int totalPage = (totalCount % rows) == 0 ? totalCount/rows : (totalCount/rows) + 1;
pb.setTotalPage(totalPage);
return pb;
}
}