06_SpringBoot_RESTful_CRUD

[TOC]

将静态资源(css,img,js)添加到项目中，放到 SpringBoot 默认的静态资源文件夹下
将模板文件(html)放到 template文件夹下

如果你的静态资源明明放到了静态资源文件夹下却无法访问，请检查一下是不是在自定义的配置类上加了@EnableWebMvc注解

默认访问首页

template文件加不是静态资源文件夹，默认是无法直接访问的，所以要添加视图映射

package com.kevinkda.test.spring.boot.springbootrestfulcrud01.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/**
 * @author Kevin KDA on 2020/6/28 16:49
 * @version 1.0.0
 * @project maven-test-01
 * @package com.kevinkda.test.spring.boot.springbootrestfulcrud01.config
 * @classname MyMvcConfig
 * @apiNote <p></p>
 * @since 1.0.0
 */

@Configuration
public class MyMvcConfig implements WebMvcConfigurer {
  @Override
  public void addViewControllers(ViewControllerRegistry registry) {
    registry.addViewController("/").setViewName("login");
    registry.addViewController("/index").setViewName("login");
    registry.addViewController("/index.html").setViewName("login");
  }
  //    所有的 WebMvcConfigurerAdapter 组件都会一起起作用
  //    将组件注册在容器
  @Bean
  public WebMvcConfigurerAdapter webMvcConfigurerAdapter() {
    WebMvcConfigurerAdapter adapter = new WebMvcConfigurerAdapter() {
      @Override
      public void addViewControllers(ViewControllerRegistry registry) {
        //                super.addViewControllers(registry);
        registry.addViewController("/").setViewName("login");
        registry.addViewController("/login.html").setViewName("index");
      }
    };
    return adapter;
  }
}

访问：http://localhost:8080/

i18n国际化

编写国际化配置文件，抽取页面需要显示的国际化消息
创建i18n文件夹存放配置文件，文件名格式为基础名(login)+语言代码(zh)+国家代码(CN)

SpringBoot自动配置好了管理国际化资源文件的组件

@Configuration(proxyBeanMethods = false)
@ConditionalOnMissingBean(name = AbstractApplicationContext.MESSAGE_SOURCE_BEAN_NAME, search = SearchStrategy.CURRENT)
@AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE)
@Conditional(ResourceBundleCondition.class)
@EnableConfigurationProperties
public class MessageSourceAutoConfiguration {
  private static final Resource[] NO_RESOURCES = {};

  public MessageSourceAutoConfiguration() {
  }
  // 我们的配置文件可以直接放在类路径下叫 messages.properties
  private String basename = "messages";

  @Bean
  @ConfigurationProperties(prefix = "spring.messages")
  public MessageSourceProperties messageSourceProperties() {
    return new MessageSourceProperties();
  }

  @Bean
    public MessageSource messageSource(MessageSourceProperties properties) {
        ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
        if (StringUtils.hasText(properties.getBasename())) {
      // 设置国际化资源文件的基础名（去掉语言国家代码的）
      messageSource.setBasenames(StringUtils
                    .commaDelimitedListToStringArray(StringUtils.trimAllWhitespace(properties.getBasename())));
        }
        if (properties.getEncoding() != null) {
            messageSource.setDefaultEncoding(properties.getEncoding().name());
        }
        messageSource.setFallbackToSystemLocale(properties.isFallbackToSystemLocale());
        Duration cacheDuration = properties.getCacheDuration();
        if (cacheDuration != null) {
            messageSource.setCacheMillis(cacheDuration.toMillis());
        }
        messageSource.setAlwaysUseMessageFormat(properties.isAlwaysUseMessageFormat());
        messageSource.setUseCodeAsDefaultMessage(properties.isUseCodeAsDefaultMessage());
        return messageSource;
    }
}

使用 ResourceBundleMessageSource 在配置文件中添加国际化文件的位置和基础名
```
spring.messages.basename=i18n.login
```
如果配置文件中没有配置基础名，就在类路径下找基础名为 message 的配置文件

将页面文字改为获取国际化配置，格式 #{key}，在页面使用 fmt:message 取出国际化内容

<!DOCTYPE html>
<!--<html lang="en">-->
<html lang="en" xmlns:th="http://www.thymeleaf.org">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <meta name="description" content="">
    <meta name="author" content="">
    <title>Signin Template for Bootstrap</title>
    <!-- Bootstrap core CSS -->
    <!--    <link href="asserts/css/bootstrap.min.css" rel="stylesheet">-->
    <link href="asserts/css/bootstrap.min.css" th:href="@{/webjars/bootstrap/4.0.0/css/bootstrap.css}" rel="stylesheet">
    <!-- Custom styles for this template -->
    <link href="asserts/css/signin.css" th:href="@{/asserts/css/signin.css}" rel="stylesheet">
  </head>

  <body class="text-center">
    <form class="form-signin" action="dashboard.html">
      <img class="mb-4" src="asserts/img/bootstrap-solid.svg" th:src="@{/asserts/img/bootstrap-solid.svg}" alt=""
           width="72" height="72">
      <h1 class="h3 mb-3 font-weight-normal" th:text="#{login.tip}">Please sign in</h1>
      <label class="sr-only" th:text="#{login.username}">Username</label>
      <input type="text" class="form-control" placeholder="Username" th:placeholder="#{login.username}" required=""
             autofocus="">
      <label class="sr-only" th:text="#{login.password}">Password</label>
      <input type="password" class="form-control" placeholder="Password" th:placeholder="#{login.password}" required="">
      <div class="checkbox mb-3">
        <label>
          <input type="checkbox" value="remember-me" > [[#{login.remember}]]
        </label>
      </div>
      <button class="btn btn-lg btn-primary btn-block" type="submit" th:text="#{login.btn}">Sign in</button>
      <p class="mt-5 mb-3 text-muted">© 2017-2018</p>
      <a class="btn btn-sm">中文</a>
      <a class="btn btn-sm">English</a>
    </form>
  </body>
</html>

然后就可以更改浏览器语言，页面就会使用对应的国际化配置文件

原理

国际化Locale（区域信息对象）；

LocaleResolver（获取区域信息对象的组件）；

在springmvc配置类WebMvcAutoConfiguration中注册了该组件

@Bean
/**
 *前提是容器中不存在这个组件，
 *所以使用自己的对象就要配置@Bean让这个条件不成立（实现LocaleResolver 即可）
 */
@ConditionalOnMissingBean

/**
 * 如果在application.properties中有配置国际化就用配置文件的
 * 没有配置就用AcceptHeaderLocaleResolver 默认request中获取
 */
@ConditionalOnProperty(
  prefix = "spring.mvc",
  name = {"locale"}
)
public LocaleResolver localeResolver() {
  if (this.mvcProperties.getLocaleResolver() == org.springframework.boot.autoconfigure.web.servlet.WebMvcProperties.LocaleResolver.FIXED) {
    return new FixedLocaleResolver(this.mvcProperties.getLocale());
  } else {
    AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver();
    localeResolver.setDefaultLocale(this.mvcProperties.getLocale());
    return localeResolver;
  }
}

点击链接切换国际化

package com.kevinkda.test.spring.boot.springbootrestfulcrud01;

import org.springframework.util.StringUtils;
import org.springframework.web.servlet.LocaleResolver;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Locale;

/**
 * 可以在连接上携帯区域信息
 *
 * @author Kevin KDA on 2020/6/28 22:04
 * @version 1.0.0
 * @project maven-test-01
 * @package com.kevinkda.test.spring.boot.springbootrestfulcrud01
 * @classname MyLocaleResolver
 * @apiNote <p></p>
 * @since 1.0.0
 */
public class MyLocaleResolver implements LocaleResolver {

  @Override
  public Locale resolveLocale(HttpServletRequest httpServletRequest) {
    //获取请求参数中的语言
    String language = httpServletRequest.getParameter("l");
    //没带区域信息参数就用系统默认的
    Locale locale = Locale.getDefault();
    if (!StringUtils.isEmpty(language)) {
      //提交的参数是zh_CN （语言代码_国家代码）
      String[] split = language.split("_");

      locale = new Locale(split[0], split[1]);
    }
    return locale;
  }

  @Override
  public void setLocale(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Locale locale) {
  }
}

@Configuration
public class MyMvcConfig extends WebMvcConfigurerAdapter {
  @Bean
  public LocaleResolver localeResolver() {
    return new MyLocaleResolver();
  }
}

默认的就是根据请求头带来的区域信息获取Locale进行国际化

public Locale resolveLocale(HttpServletRequest request) {
  Locale defaultLocale = this.getDefaultLocale();
  if (defaultLocale != null && request.getHeader("Accept-Language") == null) {
    return defaultLocale;
  } else {
    Locale requestLocale = request.getLocale();
    List<Locale> supportedLocales = this.getSupportedLocales();
    if (!supportedLocales.isEmpty() && !supportedLocales.contains(requestLocale)) {
      Locale supportedLocale = this.findSupportedLocale(request, supportedLocales);
      if (supportedLocale != null) {
        return supportedLocale;
      } else {
        return defaultLocale != null ? defaultLocale : requestLocale;
      }
    } else {
      return requestLocale;
    }
  }
}

点击连接切换语言

实现点击连接切换语言，而不是更改浏览器

修改页面，点击连接携带语言参数

<a class="btn btn-sm" href="?l=zh_CN">中文</a>
<a class="btn btn-sm" href="?l=en_US">English</a>

自己实现区域信息解析器

public class MyLocaleResolver implements LocaleResolver {
  @Override
  public Locale resolveLocale(HttpServletRequest httpServletRequest) {
    //获取请求参数中的语言
    String language = httpServletRequest.getParameter("l");
    //没带区域信息参数就用系统默认的
    Locale locale = Locale.getDefault();
    if (!StringUtils.isEmpty(language)) {
      //提交的参数是zh_CN （语言代码_国家代码）
      String[] split = language.split("_");

      locale = new Locale(split[0], split[1]);
    }
    return locale;
  }

  @Override
  public void setLocale(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Locale locale) {
  }
}

在配置类中将其注册到容器中

@Configuration
public class MyMvcConfig implements WebMvcConfigurer {
  @Override
  public void addViewControllers(ViewControllerRegistry registry) {
    registry.addViewController("/").setViewName("login");
    registry.addViewController("/index").setViewName("login");
    registry.addViewController("/index.html").setViewName("login");
  }
  @Bean
  public LocaleResolver localeResolver() {
    return new MyLocaleResolver();
  }
}

如果没有生效，请检查@Bean的那个方法的名称是否为localeResolver

实现登录功能

提供登录的controller

@Controller
public class UserController {
  @PostMapping("/user/login")
  public String login(@RequestParam String username, @RequestParam String password, HttpSession session, Model model) {
    if (!StringUtils.isEmpty(username) && "123456".equals(password)) {
      //登录成功，把用户信息方法哦session中，防止表单重复提交，重定向到后台页面
      session.setAttribute("loginUser", username);
      return "redirect:/main.html";
    }
    //登录失败,返回到登录页面
    model.addAttribute("msg", "用户名或密码错误！");
    return "login";
  }
}

修改表单提交地址，输入框添加name值与参数名称对应

<form class="form-signin" action="dashboard.html" th:action="@{/user/login}" method="post">
  <img class="mb-4" src="asserts/img/bootstrap-solid.svg" alt="" width="72" height="72">
  <h1 class="h3 mb-3 font-weight-normal" th:text="#{login.tip}">Please sign in</h1>
  <label class="sr-only">Username</label>
  <input type="text" name="username" class="form-control" th:placeholder="#{login.username}" placeholder="Username" autofocus="">
  <label class="sr-only">Password</label>
  <input type="password" name="password" class="form-control" th:placeholder="#{login.password}" placeholder="Password" required="">
  <div class="checkbox mb-3">
    <label>
      <input type="checkbox" value="remember-me"> [[#{login.remember}]]
    </label>
  </div>
  <button class="btn btn-lg btn-primary btn-block" type="submit" th:text="#{login.btn}">Sign in</button>
  <p class="mt-5 mb-3 text-muted">© 2017-2018</p>
  <a class="btn btn-sm" href="?l=zh_CN">中文</a>
  <a class="btn btn-sm" href="?l=en_US">English</a>
</form>

由于登录失败是转发，所以页面的静态资源请求路径会不正确，使用模板引擎语法替换

<link  href="asserts/css/bootstrap.min.css" th:href="@{/asserts/css/bootstrap.min.css}" rel="stylesheet">
<!-- Custom styles for this template -->
<link href="asserts/css/signin.css" th:href="@{/asserts/css/signin.css}" rel="stylesheet">

添加登录失败页面显示

<h1 class="h3 mb-3 font-weight-normal" th:text="#{login.tip}">Please sign in</h1>
<!--msg存在才显示该p标签-->
<p th:text="${msg}" th:if="${not #strings.isEmpty(msg)}" style="color: red"></p>

修改页面立即生效

开发期间模板引擎页面修改以后，要实时生效

禁用模板引擎的缓存

# 禁用缓存
spring.thymeleaf.cache=false

spring:
    # 禁用缓存
  thymeleaf:
    cache: false

在页面修改完成以后按快捷键ctrl+f9，重新编译；

拦截器进行登陆检查

实现拦截器

package cn.clboy.hellospringbootweb.interceptor;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginHandlerInterceptor implements HandlerInterceptor {
  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    Object loginUser = request.getSession().getAttribute("loginUser");
    if (loginUser == null) {
      //未登录，拦截，并转发到登录页面
      request.setAttribute("msg", "您还没有登录，请先登录！");
      request.getRequestDispatcher("/index").forward(request, response);
      return false;
    }
    return true;
  }
  @Override
  public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
  }
  @Override
  public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
  }
}

注册拦截器

package cn.clboy.hellospringbootweb.config;

import cn.clboy.hellospringbootweb.interceptor.LoginHandlerInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class MyMvcConfig implements WebMvcConfigurer {
  //定义不拦截路径
  private static final String[] excludePaths = {"/", "/index", "/index.html", "/user/login", "/asserts/**"};
  @Override
  public void addViewControllers(ViewControllerRegistry registry) {
    registry.addViewController("/").setViewName("login");
    registry.addViewController("/index").setViewName("login");
    registry.addViewController("/index.html").setViewName("login");
    registry.addViewController("/main.html").setViewName("dashboard");
  }
  @Bean
  public LocaleResolver localeResolver() {
    return new MyLocaleResolver();
  }
  @Override
  public void addInterceptors(InterceptorRegistry registry) {
    //添加不拦截的路径，SpringBoot已经做好了静态资源映射，所以我们不用管
    registry.addInterceptor(new LoginHandlerInterceptor())
      .excludePathPatterns(excludePaths);
  }
}

在spring2.0+的版本中，只要用户自定义了拦截器，则静态资源会被拦截。但是在spring1.0+的版本中，是不会拦截静态资源的。

因此，在使用spring2.0+时，配置拦截器之后，我们要把静态资源的路径加入到不拦截的路径之中。

CRUD-员工列表

使用rest风格

实验功能

请求URI

请求方式

查询所有员工

emps

GET

查询某个员工(来到修改页面)

emp/1

GET

来到添加页面

emp

GET

添加员工

emp

POST

来到修改页面（查出员工进行信息回显）

emp/1

GET

修改员工

emp

PUT

删除员工

emp/1

DELETE

为了页面结构清晰，在template文件夹下新建emp文件夹，将list.html移动到emp文件夹下
将dao层和实体层java代码复制到项目中dao，entities

添加员工controller，实现查询员工列表的方法

@Controller
public class EmpController {
  @Autowired
  private EmployeeDao employeeDao;
  @GetMapping("/emps")
  public String emps(Model model) {
    Collection<Employee> empList = employeeDao.getAll();
    model.addAttribute("emps", empList);
    return "emp/list";
  }
}

修改后台页面，更改左侧侧边栏，将customer改为员工列表，并修改请求路径

<li class="nav-item">
  <a class="nav-link" th:href="@{/emps}">
    <svg .....>
      ......
    </svg>
    员工列表
  </a>
</li>

同样emp/list页面的左边侧边栏是和后台页面一模一样的，每个都要修改很麻烦，接下来，抽取公共片段

thymeleaf公共页面元素抽取

语法

~{templatename::selector}：模板名::选择器

~{templatename::fragmentname}:模板名::片段名

/*公共代码片段*/
<footer th:fragment="copy">
  &copy; 2011 The Good Thymes Virtual Grocery
</footer>

/*引用代码片段*/
<div th:insert="~{footer :: copy}"></di

/*（〜{...}包围是完全可选的，所以上⾯的代码 将等价于：*/
<div th:insert="footer :: copy"></div>

具体参考官方文档：https://www.thymeleaf.org/doc/tutorials/3.0/usingthymeleaf.html#including-template-fragments

三种引入公共片段的th属性：

th:insert：将公共片段整个插入到声明引入的元素中
th:replace：将声明引入的元素替换为公共片段
th:include：将被引入的片段的内容包含进这个标签中

/*公共片段*/
<footer th:fragment="copy">
&copy; 2011 The Good Thymes Virtual Grocery
</footer>

/*引入方式*/
<div th:insert="footer :: copy"></div>
<div th:replace="footer :: copy"></div>
<div th:include="footer :: copy"></div>


/*效果*/
<div>
  <footer>
    &copy; 2011 The Good Thymes Virtual Grocery
  </footer>
</div>

<footer>
&copy; 2011 The Good Thymes Virtual Grocery
</footer>

<div>
&copy; 2011 The Good Thymes Virtual Grocery
</div>

后台页面抽取

将后台主页中的顶部导航栏作为片段，在list页面引入

dashboard.html：

<nav th:fragment="topbar" class="navbar navbar-dark sticky-top bg-dark flex-md-nowrap p-0">
  <a class="navbar-brand col-sm-3 col-md-2 mr-0" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">Company name</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/#">Sign out</a>
    </li>
  </ul>
</nav>

list.html：

<body>
<div th:replace="dashboard::topbar"></div>
......

使用选择器的方式抽取左侧边栏代码

dashboard.html：

<div class="container-fluid">
    <div class="row">
        <nav id="sidebar" class="col-md-2 d-none d-md-block bg-light sidebar" ......

list.html：

<div class="container-fluid">
    <div class="row">
        <div th:replace="dashboard::#sidebar"></div>
        ......

引入片段传递参数

实现点击当前项高亮

将dashboard.html中的公共代码块抽出为单独的html文件，放到commos文件夹下

在引入代码片段的时候可以传递参数，然后在sidebar代码片段模板中判断当前点击的链接

语法：

~{templatename::selector(变量名=值)}

/*或者在定义代码片段时，定义参数*/
<nav th:fragment="topbar(A,B)"
/*引入时直接传递参数*/
~{templatename::fragmentname(A值,B值)}

topbar.html

<!doctype html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<body>
<nav th:fragment="topbar" class="navbar navbar-dark sticky-top bg-dark flex-md-nowrap p-0">
  <a class="navbar-brand col-sm-3 col-md-2 mr-0" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">Company
    name</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/#">Sign out</a>
    </li>
  </ul>
</nav>
</body>
</html>

sidebar.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
<nav id="sidebar" class="col-md-2 d-none d-md-block bg-light sidebar">
  <div class="sidebar-sticky">
    <ul class="nav flex-column">
      <li class="nav-item">
        <a class="nav-link active" th:class="${currentURI}=='main.html'?'nav-link active':'nav-link'" th:href="@{/main.html}">
      .....
</body>
</html>

然后在dashboard.html和list.html中引入

<body>
<div th:replace="commons/topbar::topbar"></div>
<div class="container-fluid">
    <div class="row">
        <div th:replace="commons/sidebar::#sidebar(currentURI='main.html')"></div>
        ......

<body>
<div th:replace="commons/topbar::topbar"></div>

<div class="container-fluid">
    <div class="row">
        <div th:replace="commons/sidebar::#sidebar(currentURI='emps')"></div>
        ......

显示员工数据，添加增删改按钮

<main role="main" class="col-md-9 ml-sm-auto col-lg-10 pt-3 px-4">
  <h2>
    <button class="btn btn-sm btn-success">添加员工</button>
  </h2>
  <div class="table-responsive">
    <table class="table table-striped table-sm">
      <thead>
        <tr>
          <th>员工号</th>
          <th>姓名</th>
          <th>邮箱</th>
          <th>性别</th>
          <th>部门</th>
          <th>生日</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <tr th:each="emp:${emps}">
          <td th:text="${emp.id}"></td>
          <td th:text="${emp.lastName}"></td>
          <td th:text="${emp.email}"></td>
          <td th:text="${emp.gender}==1?'男':'女'"></td>
          <td th:text="${emp.department.departmentName}"></td>
          <td th:text="${#dates.format(emp.birth,'yyyy-MM-dd')}"></td>
          <td>
            <button class="btn btn-sm btn-primary">修改</button>
            <button class="btn btn-sm btn-danger">删除</button>
          </td>
        </tr>
      </tbody>
    </table>
  </div>
</main>

员工添加

创建员工添加页面add.html

......
<body>
<div th:replace="commons/topbar::topbar"></div>

<div class="container-fluid">
  <div class="row">
    <div th:replace="commons/sidebar::#sidebar(currentURI='emps')"></div>
    <main role="main" class="col-md-9 ml-sm-auto col-lg-10 pt-3 px-4">
      <form>
        <div class="form-group">
          <label>LastName</label>
          <input name="lastName" type="text" class="form-control" placeholder="zhangsan">
        </div>
        <div class="form-group">
          <label>Email</label>
          <input  name="email" type="email" class="form-control" placeholder="[email protected]">
        </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>
        <div class="form-group">
          <label>department</label>
          <select name="department.id" class="form-control">
            <option th:each="dept:${departments}" th:text="${dept.departmentName}" th:value="${dept.id}"></option>
          </select>
        </div>
        <div class="form-group">
          <label>Birth</label>
          <input name="birth" type="text" class="form-control" placeholder="zhangsan">
        </div>
        <button type="submit" class="btn btn-primary">添加</button>
      </form>
    </main>
  </div>
</div>
......

点击链接跳转到添加页面

<a href="/emp" th:href="@{/emp}" class="btn btn-sm btn-success">添加员工</a>Copy to clipboardErrorCopied

EmpController添加映射方法

@Autowired
private DepartmentDao departmentDao;

@GetMapping("/emp")
public String toAddPage(Model model) {
  //准备部门下拉框数据
  Collection<Department> departments = departmentDao.getDepartments();
  model.addAttribute("departments",departments);
  return "emp/add";
}

修改页面遍历添加下拉选项

<select class="form-control">
  <option th:each="dept:${departments}" th:text="${dept.departmentName}"></option>
</select>

表单提交，添加员工

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

@PostMapping("/emp")
public String add(Employee employee) {
  System.out.println(employee);
  //模拟添加到数据库
  employeeDao.save(employee);
  //添加成功重定向到列表页面
  return "redirect:/emps";
}

日期格式修改

表单提交的日期格式必须是yyyy/MM/dd的格式，可以在配置文件中修改格式

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

员工修改

点击按钮跳转到编辑页面

<a th:href="@{/emp/}+${emp.id}" class="btn btn-sm btn-primary">修改</a>Copy to clipboardErrorCopied

添加编辑页面，表单的提交要为post方式，提供_method参数

<body>
<div th:replace="commons/topbar::topbar"></div>
<div class="container-fluid">
  <div class="row">
    <div th:replace="commons/sidebar::#sidebar(currentURI='emps')"></div>
    <main role="main" class="col-md-9 ml-sm-auto col-lg-10 pt-3 px-4">
      <form th:action="@{/emp}" method="post">
        <!--员工id-->
        <input type="hidden" name="id" th:value="${emp.id}">
        <!--http请求方式-->
        <input type="hidden" name="_method" value="put">
        <div class="form-group">
          <label>LastName</label>
          <input name="lastName" th:value="${emp.lastName}" type="text" class="form-control" placeholder="zhangsan">
        </div>
        <div class="form-group">
          <label>Email</label>
          <input  name="email" th:value="${emp.email}" type="email" class="form-control" placeholder="[email protected]">
        </div>
        <div class="form-group">
          <label>Gender</label><br/>
          <div class="form-check form-check-inline">
            <input class="form-check-input" type="radio" name="gender" value="1" th:checked="${emp.gender==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" th:checked="${emp.gender==0}">
            <label class="form-check-label">女</label>
          </div>
        </div>
        <div class="form-group">
          <label>department</label>
          <select name="department.id" class="form-control">
            <option th:each="dept:${departments}" th:value="${dept.id}" th:selected="${dept.id}==${emp.department.id}" th:text="${dept.departmentName}"></option>
          </select>
        </div>
        <div class="form-group">
          <label>Birth</label>
          <input name="birth" type="text" class="form-control" placeholder="zhangsan" th:value="${#dates.format(emp.birth,'yyyy-MM-dd')}">
        </div>
        <button type="submit" class="btn btn-primary">添加</button>
      </form>
    </main>
  </div>
</div>
......

Controller转发到编辑页面，回显员工信息

@GetMapping("/emp/{id}")
public String toEditPage(@PathVariable Integer id, Model model) {
  Employee employee = employeeDao.get(id);
  //准备部门下拉框数据
  Collection<Department> departments = departmentDao.getDepartments();
  model.addAttribute("emp", employee).addAttribute("departments", departments);
  return "emp/edit";
}

提交表单修改员工信息

@PutMapping("/emp")
public String update(Employee employee) {
  employeeDao.save(employee);
  return "redirect:/emps";
}

员工删除

点击删除提交发出delete请求
```
@DeleteMapping("/emp/{id}")
public String delete(@PathVariable String id){
  employeeDao.delete(id);
  return "redirect:/emps";
}
```
如果提示不支持POST请求，在确保代码无误的情况下查看是否配置启动HiddenHttpMethodFilter
```
spring.mvc.hiddenmethod.filter.enabled=true
```
这个好像是2.0版本以后修改的
如果删除不掉，请修改EmployeeDao，把String转为Integer类型
```
public void delete(String id) {
  employees.remove(Integer.parseInt(id));
}
```

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