5.4 员工管理系统之CRUD

一.员工信息列表展示

1.步骤：

• 提取公共页面

• 编写控制器

• 列表循环展示

2.提取公共页面

（1）在template文件夹下建立common文件夹添加文件commons.html，将公共部分抽取出来

• 使用 th:fragment="topbar" ， th:fragment="sidebar" 将代码块生成片段

• 其中 <a th:class="${active == 'main.html' ? 'nav-link active' : 'nav-link'}" th:href="@{/main.html}"> 和

   <a th:class="${active == 'list.html' ? 'nav-link active' : 'nav-link'}" th:href="@{/emps}"> 目的是从其他页面调用公共页面的片段可以传递参数，此处参数是为了高亮显示，如果用户点击首页则首页列表项显示高亮，如果用户点击员工管理页则其显示为高亮

<!--顶部导航栏-->
<nav class="navbar navbar-dark sticky-top bg-dark flex-md-nowrap p-0" th:fragment="topbar">
    <a class="navbar-brand col-sm-3 col-md-2 mr-0" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#" th:text="${session.loginUser}"></a>
    <input class="form-control form-control-dark w-100" type="text" placeholder="Search" aria-label="Search">
    <ul class="navbar-nav px-3">
        <li class="nav-item text-nowrap">
            <a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">注销</a>
        </li>
    </ul>
</nav>

<!--侧边栏-->
<nav class="col-md-2 d-none d-md-block bg-light sidebar" th:fragment="sidebar">
    <div class="sidebar-sticky">
        <ul class="nav flex-column">
            <li class="nav-item">

                <a th:class="${active == 'main.html' ? 'nav-link active' : 'nav-link'}" th:href="@{/main.html}">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-home">
                        <path d="M3 9l9-7 9 7v11a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z"></path>
                        <polyline points="9 22 9 12 15 12 15 22"></polyline>
                    </svg>
                    首页 <span class="sr-only">(current)</span>
                </a>

            </li>
            <li class="nav-item">
                <a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-file">
                        <path d="M13 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V9z"></path>
                        <polyline points="13 2 13 9 20 9"></polyline>
                    </svg>
                    Orders
                </a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-shopping-cart">
                        <circle cx="9" cy="21" r="1"></circle>
                        <circle cx="20" cy="21" r="1"></circle>
                        <path d="M1 1h4l2.68 13.39a2 2 0 0 0 2 1.61h9.72a2 2 0 0 0 2-1.61L23 6H6"></path>
                    </svg>
                    Products
                </a>
            </li>
            <li class="nav-item">
                <a th:class="${active == 'list.html' ? 'nav-link active' : 'nav-link'}" th:href="@{/emps}">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-users">
                        <path d="M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2"></path>
                        <circle cx="9" cy="7" r="4"></circle>
                        <path d="M23 21v-2a4 4 0 0 0-3-3.87"></path>
                        <path d="M16 3.13a4 4 0 0 1 0 7.75"></path>
                    </svg>
                    员工管理
                </a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-bar-chart-2">
                        <line x1="18" y1="20" x2="18" y2="10"></line>
                        <line x1="12" y1="20" x2="12" y2="4"></line>
                        <line x1="6" y1="20" x2="6" y2="14"></line>
                    </svg>
                    Reports
                </a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-layers">
                        <polygon points="12 2 2 7 12 12 22 7 12 2"></polygon>
                        <polyline points="2 17 12 22 22 17"></polyline>
                        <polyline points="2 12 12 17 22 12"></polyline>
                    </svg>
                    Integrations
                </a>
            </li>
        </ul>

        <h6 class="sidebar-heading d-flex justify-content-between align-items-center px-3 mt-4 mb-1 text-muted">
            <span>Saved reports</span>
            <a class="d-flex align-items-center text-muted" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">
                <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-plus-circle"><circle cx="12" cy="12" r="10"></circle><line x1="12" y1="8" x2="12" y2="16"></line><line x1="8" y1="12" x2="16" y2="12"></line></svg>
            </a>
        </h6>
        <ul class="nav flex-column mb-2">
            <li class="nav-item">
                <a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-file-text">
                        <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"></path>
                        <polyline points="14 2 14 8 20 8"></polyline>
                        <line x1="16" y1="13" x2="8" y2="13"></line>
                        <line x1="16" y1="17" x2="8" y2="17"></line>
                        <polyline points="10 9 9 9 8 9"></polyline>
                    </svg>
                    Current month
                </a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-file-text">
                        <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"></path>
                        <polyline points="14 2 14 8 20 8"></polyline>
                        <line x1="16" y1="13" x2="8" y2="13"></line>
                        <line x1="16" y1="17" x2="8" y2="17"></line>
                        <polyline points="10 9 9 9 8 9"></polyline>
                    </svg>
                    Last quarter
                </a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-file-text">
                        <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"></path>
                        <polyline points="14 2 14 8 20 8"></polyline>
                        <line x1="16" y1="13" x2="8" y2="13"></line>
                        <line x1="16" y1="17" x2="8" y2="17"></line>
                        <polyline points="10 9 9 9 8 9"></polyline>
                    </svg>
                    Social engagement
                </a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-file-text">
                        <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"></path>
                        <polyline points="14 2 14 8 20 8"></polyline>
                        <line x1="16" y1="13" x2="8" y2="13"></line>
                        <line x1="16" y1="17" x2="8" y2="17"></line>
                        <polyline points="10 9 9 9 8 9"></polyline>
                    </svg>
                    Year-end sale
                </a>
            </li>
        </ul>
    </div>
</nav>

View Code

（2）在dashboard.html和list.html中使用片段：th:replace="~{xxx}"

• 向公共部分传递参数：使用小括号包含，中间使用键值对赋值 (active='main.html') ，此处active目的是被点到的列表项显示高亮

<!--顶部导航栏-->
<div th:replace="~{common/commons::topbar}"></div>

<!--侧边栏-->
<div th:replace="~{common/commons::sidebar(active='main.html')}"></div>

3.编写控制器

添加EmployeeController.java

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import ustc.wzh.dao.EmployeeDao;
import ustc.wzh.pojo.Employee;

import java.util.Collection;

@Controller
public class EmployeeController {

    @Autowired
    EmployeeDao employeeDao;

    //查询所有员工，返回列表页面
    @GetMapping("/emps")
    public String list(Model model){
        Collection<Employee> employees = employeeDao.getAll();
        //将结果放在请求中
        model.addAttribute("emps",employees);
        return "emp/list";
    }

}

4.列表循环展示

• Thymeleaf的循环： th:each="emp:${emps}" ，emps为后台传递来的数据，emp为循环变量

• Thymeleaf自带的日期处理工具： th:text="${#dates.format(emp.birth,'yyyy-MM-dd HH:mm')}" 

 1 <div class="table-responsive">
 2     <table class="table table-striped table-sm">
 3         <thead>
 4             <tr>
 5                 <th>id</th>
 6                 <th>lastName</th>
 7                 <th>email</th>
 8                 <th>gender</th>
 9                 <th>department</th>
10                 <th>birth</th>
11             </tr>
12         </thead>
13         <tbody>
14             <tr th:each="emp:${emps}">
15                 <td th:text="${emp.id}"></td>
16                 <td>[[${emp.lastName}]]</td>
17                 <td th:text="${emp.email}"></td>
18                 <td th:text="${emp.gender==0?'女':'男'}"></td>
19                 <td th:text="${emp.department.departmentName}"></td>
20                 <!--<td th:text="${emp.birth}"></td>-->
21                 <!--使用时间格式化工具-->
22                 <td th:text="${#dates.format(emp.birth,'yyyy-MM-dd HH:mm')}"></td>
23 
24                 <!--操作-->
25                 <td>
26                     <button class="btn btn-sm btn-primary">编辑</button>
27                     <button class="btn btn-sm btn-danger">删除</button>
28                 </td>
29             </tr>
30         </tbody>
31     </table>
32 </div>

二.添加员工信息

1.步骤：

• 添加按钮用于跳转到添加员工信息页面

• 编写员工信息添加页面

• 添加控制器方法

• 配置文件中修改日期格式

2.添加按钮用于跳转到添加员工信息页面

•  th:href="@{/emp}" 默认为get请求跳转到 @GetMapping("/emp") 方法中

<!--添加员工按钮-->
<h2> <a class="btn btn-sm btn-success"th:href="@{/emp}">添加员工</a></h2>

3.编写员工信息添加页面

•  th:action="@{/emp}" method="post" 使用post方法跳转到 @PostMapping("/emp") 方法中

• 需要提交的信息需要name属性

• 部门显示内容使用部门名称，value为部门id，还要thymeleaf的循环表达式：
   th:each="dept:${departments}" th:text="${dept.departmentName}" th:value="${dept.id}" 

• 部门提交时使用部门id： name="department.id" 

 1 <h2>添加员工</h2>
 2 <form th:action="@{/emp}" method="post">
 3     <div class="form-group">
 4         <label>LastName</label>
 5         <input type="text" name="lastName" class="form-control" placeholder="kuangshen">
 6     </div>
 7     <div class="form-group">
 8         <label>Email</label>
 9         <input type="email" name="email" class="form-control" placeholder="[email protected]">
10     </div>
11     <div class="form-group">
12         <label>Gender</label><br/>
13         <div class="form-check form-check-inline">
14             <input class="form-check-input" type="radio" name="gender"  value="1">
15             <label class="form-check-label">男</label>
16         </div>
17         <div class="form-check form-check-inline">
18             <input class="form-check-input" type="radio" name="gender"  value="0">
19             <label class="form-check-label">女</label>
20         </div>
21     </div>
22     <div class="form-group">
23         <label>department</label>
24         <!--提交的是部门的ID-->
25         <select class="form-control" name="department.id">
26             <option th:each="dept:${departments}" th:text="${dept.departmentName}" th:value="${dept.id}"></option>
27         </select>
28     </div>
29     <div class="form-group">
30         <label>Birth</label>
31         <input type="text" name="birth" class="form-control" placeholder="kuangstudy">
32     </div>
33     <button type="submit" class="btn btn-primary">添加</button>
34 </form>

4.添加控制器方法

• 使用RestFul风格提交方式 @PostMapping("/emp") ， @GetMapping("/emp") 

 1 @Autowired
 2 DepartmentDao departmentDao;
 3 
 4 //跳转到员工添加页面
 5 @GetMapping("/emp")
 6 public String toAddPage(Model model){
 7     //查出所有的部门，提供选择
 8     Collection<Department> departments = departmentDao.getDepartments();
 9     model.addAttribute("departments",departments);
10     return "emp/add";
11 }
12 
13 //员工添加功能
14 //接收前端传递的参数，自动封装成为对象[要求前端传递的参数名，和属性名一致]
15 @PostMapping("/emp")
16 public String addEmp(Employee employee){
17     System.out.println(employee);
18     employeeDao.save(employee); //保存员工信息
19     //回到员工列表页面，可以使用redirect或者forward
20     return "redirect:/emps";
21 }

5.配置文件中修改日期格式

• 一旦修改就不能使用原来的yyyy/MM/dd的方式提交

# 设置日期格式
spring.mvc.date-format=yyyy-MM-dd