3.1 thymeleaf简介

Thymeleaf is a modern server-side Java template engine for both web and standalone environments, capable of processing HTML, XML, JavaScript, CSS and even plain text.
现代化、服务端Java模板引擎

3.2 基本语法

3.2.1 表达式

05、Web开发

3.2.2 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

3.2.3 文本操作

字符串拼接: +
变量替换: |The name is ${name}|

3.2.4 数学运算

运算符: + , - , * , / , %

3.2.5 布尔运算

运算符: and , or
一元运算: ! , not

3.2.6 比较运算

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

3.2.7 条件运算

If-then: (if) ? (then)
If-then-else: (if) ? (then) : (else)
Default: (value) ?: (defaultvalue)

3.2.8 特殊操作

无操作： _

3.3 设置属性值-th:attr

设置单个值

  1. <form action="subscribe.html" th:attr="action=@{/subscribe}">
  2.   <fieldset>
  3.     <input type="text" name="email" />
  4.     <input type="submit" value="Subscribe!" th:attr="value=#{subscribe.submit}"/>
  5.   </fieldset>
  6. </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兼容的标签写法
https://www.thymeleaf.org/doc/tutorials/3.0/usingthymeleaf.html#setting-value-to-specific-attributes

3.4 遍历

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

<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>

3.5 条件运算

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

<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>

3.6 属性优先级

image.png

3.7 thymeleaf的使用

1. 引入Starter

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

2. 自动配置好了thymeleaf

@Configuration(proxyBeanMethods = false)
@EnableConfigurationProperties(ThymeleafProperties.class)
@ConditionalOnClass({ TemplateMode.class, SpringTemplateEngine.class })
@AutoConfigureAfter({ WebMvcAutoConfiguration.class, WebFluxAutoConfiguration.class })
public class ThymeleafAutoConfiguration { }

自动配好的策略

  • 1、所有thymeleaf的配置值都在 ThymeleafProperties
  • 2、配置好了 SpringTemplateEngine
  • 3、配好了 ThymeleafViewResolver

  • 4、我们只需要直接开发页面

      public static final String DEFAULT_PREFIX = "classpath:/templates/";

  public static final String DEFAULT_SUFFIX = ".html";  //xxx.html

    3. 页面开发

    ①页面放到templates文件夹中：

    image.png

    ②添加提示功能：

    image.png

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

    ③使访问路径必须以/world开始，@{}也会自动把world加入进去

    server:
servlet:
 context-path: /world

    ④前缀和后缀会自动拼接跳转到login.html页面

    /**
   * 登录页面
   * @return
   */
  @GetMapping(value = {"/","/login"})
  public String loginPage(){

      return "login";
  }

    image.png

⑤标签行内写法

image.png