添加员工信息

1. 将添加员工信息改为超链接

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

2.编写对应的controller

//to员工添加页面
    @GetMapping("/emp")
    public String toAddPage(){
        return "emp/add";
    }

3.添加前端页面；复制list页面，修改即可

bootstrap官网文档 ： https://v4.bootcss.com/docs/4.0/components/forms/ ， 我们去可以里面找自己喜欢的样式！

<!--新增员工的表单 -->
            <form th:action="@{/addEmp}" method="post">
                <div class="form-group">
                    <label>LastName</label>
                    <input  name="lastName" type="text" class="form-control" placeholder="kuangshen">
                </div>
                <div class="form-group">
                    <label>Email</label>
                    <input name="email" type="email" class="form-control" placeholder="24736743@qq.com">
                </div>
                <div class="form-group">
                    <label>Gender</label><br/>
                    <div class="form-check form-check-inline">
                        <input class="form-check-input" type="radio" name="gender"  value="1">
                        <label class="form-check-label">男</label>
                    </div>
                    <div class="form-check form-check-inline">
                        <input class="form-check-input" type="radio" name="gender"  value="0">
                        <label class="form-check-label">女</label>
                    </div>
                </div>
 <!--部门，应该从后台查询显示，用户选择-->
                <div class="form-group">
                    <label>department</label>
                    <select class="form-control" name="department.id">
                         <!--each 遍历这个标签-->
                        <option th:each="dept:${department}"th:text="${dept.departmentName}" th:value="${dept.id}">1</option>

                    </select>
                </div>
                <div class="form-group">
                    <label>Birth</label>
                    <input name="birth" type="text" class="form-control" placeholder="kuangstudy">
                </div>
                <button type="submit" class="btn btn-primary">添加</button>
            </form>

4.部门信息下拉框应该选择的是我们提供的数据，所以我们要修改一下前端和后端

EmpController

//toAddPage
    @RequestMapping("/toAddPage")
    public String toAddPage(Model model){
        Collection<Department> department= departmentDao.getDepartments();
        model.addAttribute("department" ,department);
        return "emp/add";
    }

前端页面

<!--部门，应该从后台查询显示，用户选择-->
                <div class="form-group">
                    <label>department</label>
                    <select class="form-control" name="department.id">
                         <!--each 遍历这个标签-->
                        <option th:each="dept:${department}"th:text="${dept.departmentName}" th:value="${dept.id}">1</option>

                    </select>
                </div>

1.修改add页面form表单提交地址和方式

<form th:action="@{/emp}" method="post">

2.编写controller；

//addEmp
    @RequestMapping("/addEmp")
    public String addEmp(Employee employee){
        System.out.println("测试信息："+employee);
        //保存到数据库
        employeeDao.save(employee);
//回到员工列表，转发，重定向
        return  "redirect:/emplist";
    }

重定向和转发 以及 /的问题？

原理探究 ： ThymeleafViewResolver

public static final String REDIRECT_URL_PREFIX = "redirect:";
    public static final String FORWARD_URL_PREFIX = "forward:";

    protected View createView(String viewName, Locale locale) throws Exception {
        if (!this.alwaysProcessRedirectAndForward && !this.canHandle(viewName, locale)) {
            vrlogger.trace("[THYMELEAF] View \"{}\" cannot be handled by ThymeleafViewResolver. Passing on to the next resolver in the chain.", viewName);
            return null;
        } else {
            String forwardUrl;
            if (viewName.startsWith("redirect:")) {
                vrlogger.trace("[THYMELEAF] View \"{}\" is a redirect, and will not be handled directly by ThymeleafViewResolver.", viewName);
                forwardUrl = viewName.substring("redirect:".length(), viewName.length());
                RedirectView view = new RedirectView(forwardUrl, this.isRedirectContextRelative(), this.isRedirectHttp10Compatible());
                return (View)this.getApplicationContext().getAutowireCapableBeanFactory().initializeBean(view, viewName);
            } else if (viewName.startsWith("forward:")) {
                vrlogger.trace("[THYMELEAF] View \"{}\" is a forward, and will not be handled directly by ThymeleafViewResolver.", viewName);
                forwardUrl = viewName.substring("forward:".length(), viewName.length());
                return new InternalResourceView(forwardUrl);
            } else if (this.alwaysProcessRedirectAndForward && !this.canHandle(viewName, locale)) {
                vrlogger.trace("[THYMELEAF] View \"{}\" cannot be handled by ThymeleafViewResolver. Passing on to the next resolver in the chain.", viewName);
                return null;
            } else {
                vrlogger.trace("[THYMELEAF] View {} will be handled by ThymeleafViewResolver and a {} instance will be created for it", viewName, this.getViewClass().getSimpleName());
                return this.loadView(viewName, locale);
            }
        }
    }

我们要接收前端传过来的属性，将它封装成为对象！首先需要将前端页面空间的name属性编写完毕！

编写controller接收调试打印

//addEmp
    @RequestMapping("/addEmp")
    public String addEmp(Employee employee){
        System.out.println("测试信息："+employee);
        //保存到数据库
        employeeDao.save(employee);
//回到员工列表，转发，重定向
        return  "redirect:/emplist";
    }

此时的前端页面如下图所示：

注册完成后，页面跳转显示正常，但是时间格式为

当提交为下图是就会报400错

设置时间格式，使其可以为默认的格式：

在webmvc的自动配置文件；找到一个日期格式化的方法，我们可以看一下

@Bean
        public FormattingConversionService mvcConversionService() {
            WebConversionService conversionService = new WebConversionService(this.mvcProperties.getDateFormat());
            this.addFormatters(conversionService);
            return conversionService;
        }

调用了 getDateFormat 方法；

public String getDateFormat() {
        return this.dateFormat;
    }

这个在配置类中，所以我们可以自定义的去修改这个时间格式化问题，我们在我们的配置文件中修改一下；

spring.mvc.date-format=yyyy-MM-dd

这样时间格式设置就完成了