SpringBoot:视图解析与模板引擎

视图解析

视图解析:SpringBoot默认不支持 JSP,需要引入第三方模板引擎技术实现页面渲染。

基本语法

1.表达式

2.字面量

文本值: 'one text' , 'Another one!' ,…数字: 0 , 34 , 3.0 , 12.3 ,…布尔值: true , false

空值: null

变量: one,two,.... 变量不能有空格

3.文本操作

字符串拼接: +

变量替换: |The name is ${name}|

4.数学运算

运算符: + , - , * , / , %

5.布尔运算

运算符: and , or

一元运算: ! , not

6.比较运算

比较: > , < , >= , <= ( gt , lt , ge , le )等式: == , != ( eq , ne )

7.条件运算

If-then: (if) ? (then)

If-then-else: (if) ? (then) : (else)

Default: (value) ?: (defaultvalue)

8.特殊操作

无操作: _

设置属性值-th:attr

设置单个值

<form action="subscribe.html" th:attr="action=@{/subscribe}">
  <fieldset>
    <input type="text" name="email" />
    <input type="submit" value="Subscribe!" th:attr="value=#{subscribe.submit}"/>
  </fieldset>
</form>

设置多个值

<img src="../../images/gtvglogo.png"  th:attr="src=@{/images/gtvglogo.png},title=#{logo},alt=#{logo}" />

以上两个的代替写法 th:xxxx

<input type="submit" value="Subscribe!" th:value="#{subscribe.submit}"/>
<form action="subscribe.html" th:action="@{/subscribe}">

 所有h5标签兼容的写法

https://www.thymeleaf.org/doc/tutorials/3.0/usingthymeleaf.html#setting-value-to-specific-attributes

迭代

<tr th:each="prod,iterStat : ${prods}" th:class="${iterStat.odd}? 'odd'">
  <td th:text="${prod.name}">Onions</td>
  <td th:text="${prod.price}">2.41</td>
  <td th:text="${prod.inStock}? #{true} : #{false}">yes</td>
</tr>

条件运算

<a href="comments.html"
th:href="@{/product/comments(prodId=${prod.id})}"
th:if="${not #lists.isEmpty(prod.comments)}">view</a>

当${not #lists.isEmpty(prod.comments)}为TRUE的时候。就显示超链接。否则不显示

<div th:switch="${user.role}">
  <p th:case="'admin'">User is an administrator</p>
  <p th:case="#{roles.manager}">User is a manager</p>
  <p th:case="*">User is some other thing</p>
</div>

如果值都不在上述case里,则th:case=”*”语句会生效

thymeleaf使用

1.引入Starter

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

2.页面开发

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1 th:text="${msg}">哈哈</h1>
<h2>
    <!--href="www.tinstu.com“  (link为www.baidu.com)-->
    <a href="www.tinstu.com" th:href="${link}">去百度</a>  <br/>   
    <!--href=“www.tinstu.com/link”-->
    <a href="www.tinstu.com" th:href="@{/link}">去百度2</a>
</h2>
</body>
</html>

 数据渲染

    @GetMapping("/dynamic_table")
    public String dynamic_table(Model model){
        //表格内容的遍历
        List<User> users = Arrays.asList(new User("zhangsan", "123456"),
                new User("lisi", "123444"),
                new User("haha", "aaaaa"),
                new User("hehe ", "aaddd"));
        model.addAttribute("users",users);

        return "table/dynamic_table";
    }

 

        <table class="display table table-bordered" id="hidden-table-info">
        <thead>
        <tr>
            <th>#</th>
            <th>用户名</th>
            <th>密码</th>
        </tr>
        </thead>
        <tbody>
        <tr class="gradeX" th:each="user,stats:${users}">
            <td th:text="${stats.count}">Trident</td>
            <td th:text="${user.userName}">Internet</td>
            <td >[[${user.password}]]</td>
        </tr>
        </tbody>
        </table>

 

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