springboot05-RestfulCRUD

案例分析

1)、默認訪問首頁

 
//使用WebMvcConfigurerAdapter可以來擴展SpringMVC的功能
//@EnableWebMvc   不要接管SpringMVC
@Configuration
public class MyMvcConfig extends WebMvcConfigurerAdapter {
@Override
public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/yjsj").setViewName("success");
}


@Bean
public WebMvcConfigurer webMvcConfigurer(){
   WebMvcConfigurer webMvcConfigurer = new WebMvcConfigurer() {
      //註冊視圖映射組件
      @Override
      public void addViewControllers(ViewControllerRegistry 			            registry) {
                //後面的setView如同controller的返回值
                registry.addViewController("/").setViewName("index");
                registry.addViewController("/index.html").setViewName("index");
                registry.addViewController("/main.html").setViewName("dashboard");
      }
}

2)、國際化

1)、編寫國際化配置文件;
2)、使用ResourceBundleMessageSource管理國際化資源文件 3)、在頁面使用fmt:message取出國際化內容

步驟:
1)、編寫國際化配置文件,抽取頁面需要顯示的國際化消息
在這裏插入圖片描述
2).springboot已經幫我們配好了管理國際化資源的文件

3)、去頁面獲取國際化的值;
在這裏插入圖片描述
效果:根據瀏覽器語言設置的信息切換了國際化;

原理:
國際化Locale(區域信息對象);LocaleResolver(獲取區域信息對象);
4)、點擊鏈接切換國際化

/**
* 可以在連接上攜帶區域信息
*/ 
public class MyLocaleResolver implements LocaleResolver {
   
   @Override
   public Locale resolveLocale(HttpServletRequest request) {
       String l = request.getParameter("l");
       Locale locale = Locale.getDefault();
       if(!StringUtils.isEmpty(l)){
           String[] split = l.split("_");
           locale = new Locale(split[0],split[1]);
       }
       return locale;
   }

   @Override
   public void setLocale(HttpServletRequest request, HttpServletResponse response, Locale  locale) {

   }
}


@Bean
   public LocaleResolver localeResolver(){
       return new MyLocaleResolver();
   }
}


3)、登陸

開發期間模板引擎頁面修改以後,要實時生效
1)、禁用模板引擎的緩存

# 禁用緩存
spring.thymeleaf.cache=false

2)、頁面修改完成以後ctrl+f9:重新編譯;

4)、攔截器進行登陸檢查

攔截器

/**
* 登陸檢查,
*/
public class LoginHandlerInterceptor implements HandlerInterceptor {
//目標方法執行之前
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
Object user = request.getSession().getAttribute("loginUser");
if(user == null){
//未登陸,返回登陸頁面
request.setAttribute("msg","沒有權限請先登陸");
request.getRequestDispatcher("/index.html").forward(request,response);
return false;
}else{
//已登陸,放行請求
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 {
}
}

註冊攔截器

//所有的WebMvcConfigurerAdapter組件都會一起起作用
@Bean //將組件註冊在容器
public WebMvcConfigurerAdapter webMvcConfigurerAdapter(){
WebMvcConfigurerAdapter adapter = new WebMvcConfigurerAdapter() {
@Override
public void addViewControllers(ViewControllerRegistry registry) {
registry.addViewController("/").setViewName("login");
registry.addViewController("/index.html").setViewName("login");
registry.addViewController("/main.html").setViewName("dashboard"); }
//註冊攔截器
@Override
public void addInterceptors(InterceptorRegistry registry) {
//super.addInterceptors(registry);
//靜態資源; *.css , *.js
//SpringBoot已經做好了靜態資源映射
registry.addInterceptor(new
LoginHandlerInterceptor()).addPathPatterns("/**")
//Springboot2以後對wabjars內容也會攔截
.excludePathPatterns("/index.html","/","/user/login","/webjars/**"
);
}
};
return adapter;
}

5)、CRUD-員工列表

實驗要求:
1)、RestfulCRUD:CRUD滿足Rest風格;
URI: /資源名稱/資源標識 HTTP請求方式區分對資源CRUD操作

項目 普通CRUD(uri來區分操作) RestfulCRUD
查詢 getEmp emp—GET
添加 addEmp?xxx emp—POST
修改 updateEmp?id=xxx&xxx=xx emp/{id}—PUT
刪除 deleteEmp?id=1 emp/{id}—DELETE

2)、實驗的請求架構;

項目 請求URI 請求方式
查詢所有員工 emps GET
查詢某個員工(來到修改頁面) emp/1 GET
來到添加頁面 emps GET
添加員工 emp POST
來到修改頁面(查出員工進行信息回顯) emp/1 GET
修改員工 emp PUT
刪除員工 emp/1 DELETE

3)、員工列表:
thymeleaf公共頁面元素抽取

1、抽取公共片段
<div th:fragment="copy">
&copy; 2011 The Good Thymes Virtual Grocery
</div>
 
2、引入公共片段
<div th:insert="~{footer :: copy}"></div>
~{templatename::selector}:模板名::選擇器
~{templatename::fragmentname}:模板名::片段名
 
3、默認效果: 
insert的公共片段在div標籤中
如果使用th:insert等屬性進行引入,可以不用寫~{}: 行內寫法可以加上:[[~{}]];[(~{})];
三種引入公共片段的th屬性: 
th:insert:將公共片段整個插入到聲明引入的元素中 th:replace:將聲明引入的元素替換爲公共片段 
th:include:將被引入的片段的內容包含進這個標籤中  
<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>

引入片段的時候傳入參數:

 
<nav class="col‐md‐2 d‐none d‐md‐block bg‐light sidebar" id="sidebar">
   <div class="sidebar‐sticky">
       <ul class="nav flex‐column">
           <li class="nav‐item">
               <a class="nav‐link active"
                  th:class="${activeUri=='main.html'?'nav‐link active':'nav‐link'}"
                  href="#" 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>
                   Dashboard <span class="sr‐only">(current)</span>
               </a>
           </li>

<!‐‐引入側邊欄;傳入參數‐‐>
<div th:replace="commons/bar::#sidebar(activeUri='emps')"></div>

6)、CRUD-員工添加

  • 添加頁面
<!DOCTYPE html>
<!-- saved from url=(0052)http://getbootstrap.com/docs/4.0/examples/dashboard/ -->
<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>Dashboard Template for Bootstrap</title>
   <!-- Bootstrap core CSS -->
   <link th:href="@{/webjars/bootstrap/4.4.1-1/css/bootstrap.css}" rel="stylesheet">

   <!-- Custom styles for this template -->
   <link th:href="@{asserts/css/dashboard.css}" rel="stylesheet">
   <style type="text/css">
       /* Chart.js */

       @-webkit-keyframes chartjs-render-animation {
           from {
               opacity: 0.99
           }
           to {
               opacity: 1
           }
       }

       @keyframes chartjs-render-animation {
           from {
               opacity: 0.99
           }
           to {
               opacity: 1
           }
       }

       .chartjs-render-monitor {
           -webkit-animation: chartjs-render-animation 0.001s;
           animation: chartjs-render-animation 0.001s;
       }
   </style>
</head>

<body>
<!-- 引入抽取的topBar -->
<!-- 模板名:使用thymeleaf的前後綴配置規則進行解析-->
<!-- ~{模板名::抽取塊名} -->
<div th:replace="commons/bar::topBar"></div>
<div class="container-fluid">
   <div class="row">
       <div th:replace="commons/bar::#leftBar(activeUri='emps')"></div>

       <main role="main" class="col-md-9 ml-sm-auto col-lg-10 pt-3 px-4">
           <!--需要區分是員工修改還是添加;-->
           <form th:action="@{/emp}" method="post">
               <!--發送put請求修改員工數據-->
               <!--
               1、SpringMVC中配置HiddenHttpMethodFilter;(SpringBoot自動配置好的)
               2、頁面創建一個post表單
               3、創建一個input項,name="_method";值就是我們指定的請求方式
               -->
               <input type="hidden" name="_method" value="put" th:if="${emp!=null}"/>
               <input type="hidden" name="id" th:if="${emp!=null}" th:value="${emp.id}">
               <div class="form-group">
                   <label>LastName</label>
                   <input name="lastName" type="text" class="form-control" placeholder="zhangsan" th:value="${emp!=null}?${emp.lastName}">
               </div>
               <div class="form-group">
                   <label>Email</label>
                   <input name="email" type="email" class="form-control" placeholder="[email protected]" th:value="${emp!=null}?${emp.email}">
               </div>
               <div class="form-group">
                   <label>Gender</label><br/>
                   <div class="form-check form-check-inline">
                       <input class="form-check-input" type="radio" name="gender" value="1" th:checked="${emp!=null}?${emp.gender==1}">
                       <label class="form-check-label"></label>
                   </div>
                   <div class="form-check form-check-inline">
                       <input class="form-check-input" type="radio" name="gender" value="0" th:checked="${emp!=null}?${emp.gender==0}">
                       <label class="form-check-label"></label>
                   </div>
               </div>
               <div class="form-group">
                   <label>department</label>
                   <!--提交的是部門的id-->
                   <select class="form-control" name="department.id">
                       <option th:selected="${emp!=null}?${dep.id == emp.department.id}" th:value="${dep.id}" th:each="dep:${deps}" th:text="${dep.departmentName}">1</option>
                   </select>
               </div>
               <div class="form-group">
                   <label>Birth</label>
                   <input name="birth" type="text" class="form-control" placeholder="zhangsan" th:value="${emp!=null}?${#dates.format(emp.birth, 'yyyy-MM-dd HH:mm')}">
               </div>
               <button type="submit" class="btn btn-primary" th:text="${emp!=null}?'修改':'添加'">添加</button>
           </form>
       </main>
   </div>
</div>

<!-- Bootstrap core JavaScript
================================================== -->
<!-- Placed at the end of the document so the pages load faster -->
<script type="text/javascript" src="asserts/js/jquery-3.2.1.slim.min.js" th:src="@{/webjars/jquery/3.4.1/jquery.js}"></script>
<script type="text/javascript" src="asserts/js/popper.min.js" th:src="@{/webjars/popper.js/2.0.2/cjs/popper.js}"></script>
<script type="text/javascript" src="asserts/js/bootstrap.min.js" th:src="@{/webjars/bootstrap/4.4.1-1/js/bootstrap.js}"></script>

<!-- Icons -->
<script type="text/javascript" src="asserts/js/feather.min.js" th:src="@{/asserts/js/feather.min.js}"></script>
<script>
   feather.replace()
</script>

<!-- Graphs -->
<script type="text/javascript" th:src="@{asserts/js/Chart.min.js}"></script>
<script>
   var ctx = document.getElementById("myChart");
   var myChart = new Chart(ctx, {
       type: 'line',
       data: {
           labels: ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"],
           datasets: [{
               data: [15339, 21345, 18483, 24003, 23489, 24092, 12034],
               lineTension: 0,
               backgroundColor: 'transparent',
               borderColor: '#007bff',
               borderWidth: 4,
               pointBackgroundColor: '#007bff'
           }]
       },
       options: {
           scales: {
               yAxes: [{
                   ticks: {
                       beginAtZero: false
                   }
               }]
           },
           legend: {
               display: false,
           }
       }
   });
</script>

</body>

</html>`
  • 修改頁面
<!‐‐需要區分是員工修改還是添加;‐‐>
<form th:action="@{/emp}" method="post">
   <!‐‐發送put請求修改員工數據‐‐>
   <!‐‐
1、SpringMVC中配置HiddenHttpMethodFilter;(SpringBoot自動配置好的) 2、頁面創建一個post表單
3、創建一個input項,name="_method";值就是我們指定的請求方式
‐‐>
   <input type="hidden" name="_method" value="put" th:if="${emp!=null}"/>
   <input type="hidden" name="id" th:if="${emp!=null}" th:value="${emp.id}">
   <div class="form‐group">
       <label>LastName</label>
       <input name="lastName" type="text" class="form‐control" placeholder="zhangsan"  th:value="${emp!=null}?${emp.lastName}">
   </div>
   <div class="form‐group">
       <label>Email</label>
       <input name="email" type="email" class="form‐control"  
placeholder="[email protected]" th:value="${emp!=null}?${emp.email}">
   </div>
   <div class="form‐group">
       <label>Gender</label><br/>
       <div class="form‐check form‐check‐inline">
           <input class="form‐check‐input" type="radio" name="gender" value="1"  
th:checked="${emp!=null}?${emp.gender==1}">
           <label class="form‐check‐label"></label>
       </div>
       <div class="form‐check form‐check‐inline">
           <input class="form‐check‐input" type="radio" name="gender" value="0"  
th:checked="${emp!=null}?${emp.gender==0}">
           <label class="form‐check‐label"></label>
       </div>
   </div>
   <div class="form‐group">
       <label>department</label>
       <!‐‐提交的是部門的id‐‐>
       <select class="form‐control" name="department.id">
           <option th:selected="${emp!=null}?${dept.id == emp.department.id}"  
th:value="${dept.id}" th:each="dept:${depts}" th:text="${dept.departmentName}">1</option>         </select>
   </div>
   <div class="form‐group">
       <label>Birth</label>
       <input name="birth" type="text" class="form‐control" placeholder="zhangsan"  
th:value="${emp!=null}?${#dates.format(emp.birth, 'yyyy‐MM‐dd HH:mm')}">
   </div>
   <button type="submit" class="btn btn‐primary" th:text="${emp!=null}?'修改':'添加'">添加 </button>
</form>
  • 刪除頁面
<tr th:each="emp:${emps}">
   <td th:text="${emp.id}"></td>
   <td>[[${emp.lastName}]]</td>
   <td th:text="${emp.email}"></td>
   <td th:text="${emp.gender}==0?'':''"></td>
   <td th:text="${emp.department.departmentName}"></td>
   <td th:text="${#dates.format(emp.birth, 'yyyy‐MM‐dd HH:mm')}"></td>

   <td>
   <a class="btn btn‐sm btn‐primary" th:href="@{/emp/}+${emp.id}">編輯</a>
<button th:attr="del_uri=@{/emp/}+${emp.id}" class="btn btn‐sm btn‐danger deleteBtn">刪除</button>
</td>
</tr>
<script>
$(".deleteBtn").click(function(){
//刪除當前員工的
$("#deleteEmpForm").attr("action",$(this).attr("del_uri")).submit();
return false;
});
</script>

springbooe2則需要配置:spring.mvc.hiddenmethod.filter.enabled=true

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