Thymeleaf模板引擎的使用

  • 2019 年 10 月 20 日
  • 筆記

Thymeleaf模板引擎的使用

1、模板引擎

JSP、Velocity、Freemarker、Thymeleaf

2、springboot推荐使用Thymeleaf模板引擎

特点：语法更简单，功能更强大；

①、引入Thymeleaf

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

②、Thymeleaf的使用

@ConfigurationProperties(prefix = "spring.thymeleaf")  public class ThymeleafProperties {        private static final Charset DEFAULT_ENCODING = Charset.forName("UTF-8");        private static final MimeType DEFAULT_CONTENT_TYPE = MimeType.valueOf("text/html");        public static final String DEFAULT_PREFIX = "classpath:/templates/";        public static final String DEFAULT_SUFFIX = ".html";

只要我们把HTML页面放在classpath:/templates/，thymeleaf就能自动渲染；

④、导入thymeleaf的名称空间

<html lang="en" xmlns:th="http://www.thymeleaf.org">

⑤、使用thymeleaf语法

<!DOCTYPE html>  <html lang="en" xmlns:th="http://www.thymeleaf.org">  <head>      <meta charset="UTF-8">      <title>Title</title>  </head>  <body>      <h1>成功！</h1>      <!--th:text 将div里面的文本内容设置为 -->      <div th:text="${hello}">这是显示欢迎信息</div>  </body>  </html>

3、语法规则

①、th:text；改变当前元素里面的文本内容；​th：任意html属性；来替换原生属性的值

②、表达式

Simple expressions:（表达式语法）      Variable Expressions: ${...}：获取变量值；OGNL；              1）、获取对象的属性、调用方法              2）、使用内置的基本对象：                  #ctx : the context object.                  #vars: the context variables.                  #locale : the context locale.                  #request : (only in Web Contexts) the HttpServletRequest object.                  #response : (only in Web Contexts) the HttpServletResponse object.                  #session : (only in Web Contexts) the HttpSession object.                  #servletContext : (only in Web Contexts) the ServletContext object.                    ${session.foo}              3）、内置的一些工具对象：  #execInfo : information about the template being processed.  #messages : methods for obtaining externalized messages inside variables expressions, in the same way as they would be obtained using #{…} syntax.  #uris : methods for escaping parts of URLs/URIs  #conversions : methods for executing the configured conversion service (if any).  #dates : methods for java.util.Date objects: formatting, component extraction, etc.  #calendars : analogous to #dates , but for java.util.Calendar objects.  #numbers : methods for formatting numeric objects.  #strings : methods for String objects: contains, startsWith, prepending/appending, etc.  #objects : methods for objects in general.  #bools : methods for boolean evaluation.  #arrays : methods for arrays.  #lists : methods for lists.  #sets : methods for sets.  #maps : methods for maps.  #aggregates : methods for creating aggregates on arrays or collections.  #ids : methods for dealing with id attributes that might be repeated (for example, as a result of an iteration).        Selection Variable Expressions: *{...}：选择表达式：和${}在功能上是一样；          补充：配合 th:object="${session.user}：     <div th:object="${session.user}">      <p>Name: <span th:text="*{firstName}">Sebastian</span>.</p>      <p>Surname: <span th:text="*{lastName}">Pepper</span>.</p>      <p>Nationality: <span th:text="*{nationality}">Saturn</span>.</p>      </div>        Message Expressions: #{...}：获取国际化内容      Link URL Expressions: @{...}：定义URL；              @{/order/process(execId=${execId},execType='FAST')}      Fragment Expressions: ~{...}：片段引用表达式              <div th:insert="~{commons :: main}">...</div>    Literals（字面量）        Text literals: 'one text' , 'Another one!' ,…        Number literals: 0 , 34 , 3.0 , 12.3 ,…        Boolean literals: true , false        Null literal: null        Literal tokens: one , sometext , main ,…  Text operations:（文本操作）      String concatenation: +      Literal substitutions: |The name is ${name}|  Arithmetic operations:（数学运算）      Binary operators: + , - , * , / , %      Minus sign (unary operator): -  Boolean operations:（布尔运算）      Binary operators: and , or      Boolean negation (unary operator): ! , not  Comparisons and equality:（比较运算）      Comparators: > , < , >= , <= ( gt , lt , ge , le )      Equality operators: == , != ( eq , ne )  Conditional operators:条件运算（三元运算符）      If-then: (if) ? (then)      If-then-else: (if) ? (then) : (else)      Default: (value) ?: (defaultvalue)  Special tokens:      No-Operation: _

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