8、模板引擎thymeleaf(百里香叶)

模板引擎有:JSP、Velocity、Freemarker、Thymeleaf  等.....

 

对于模板引擎,SpringBoot(springboot使用的是嵌入式的tomcat所以不支持jsp)推荐的Thymeleaf;

 

1)、引入thymeleaf  (thyme:百里香,leaf:叶子  thymeleaf:百里香叶)

  thymeleaf官网:https://www.thymeleaf.org/

  pom文件中导入依赖坐标(即开启springboot中的thymeleaf启动器):

<!--模板引擎-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency> 

 

切换其版本操作:在pom文件中的的properties标签中指定版本
可在GitHub中进行查看thymeleaf的版本https://github.com/thymeleaf/thymeleaf/releases 
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  <properties>
                <thymeleaf.version>3.0.9.RELEASE</thymeleaf.version>
                <!-- 布局功能的支持程序  thymeleaf3主程序 应该搭配 layout2以上版本 -->
                <!-- thymeleaf2 应该搭配 layout1版本-->
                <thymeleaf-layout-dialect.version>2.2.2</thymeleaf-layout-dialect.version>
  </properties>
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 2)、thymeleaf的使用

使用规则:

ThymeleafProperties.java

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@ConfigurationProperties(
    prefix = "spring.thymeleaf"
)
public class ThymeleafProperties {
    private static final Charset DEFAULT_ENCODING;
    public static final String DEFAULT_PREFIX = "classpath:/templates/";
    public static final String DEFAULT_SUFFIX = ".html";
    private boolean checkTemplate = true;
    private boolean checkTemplateLocation = true;
    private String prefix = "classpath:/templates/";
    private String suffix = ".html";
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只要我们把HTML页面放在classpath:/templates/,thymeleaf就能自动渲染;

测试:

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@Controller
public class TestController {

    @RequestMapping("/test")
    public  String testThymelea(){
        //classpath:/templates/th.html
        return "th";
    }
}
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 静态文件

 

测试结果:

 

3)、使用案例:

  编写一个mapper设置hello的值为你好;然后跳转到success页面

    @RequestMapping("/success")
    public String success(Map<String,Object> map){
        //使用thymeleaf模板引擎,自动找thymeleaf会找template下的页面进行渲染,
        map.put("hello","你好!");
        return "success";
    }

  success.html;在<html>标签中导入thymeleaf的命名空间,有提示作用

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>成功</title>
</head>
<body>
    <h1>成功</h1>
    <div th:text="${hello}"></div>
</body>
</html>

th:text="${hello}"是thymeleaf的语法,即取出域中hello的值

访问

 

 4)、thymeleaf语法规则:

th:text;改变当前元素里面的文本内容;
<div th:id="" th:class=""></div>
文档的:位置

 

5)、thymeleaf表达式
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Simple expressions:(表达式语法)
. Variable Expressions: ${...}:获取变量值;OGNL;
        1)、获取对象的属性、调用方法
        2)、使用内置的基本对象:
          #ctx : the context object.
          #vars: the context variables.
          #locale : the context locale.
          #request : (only in Web Contexts) the HttpServletRequest object.
          #response : (only in Web Contexts) the HttpServletResponse object.
          #session : (only in Web Contexts) the HttpSession object.
          #servletContext : (only in Web Contexts) the ServletContext object.
            例如获取session中foo的属性值:${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}:
   例如: <div th:object="${session.user}">   <p>Name: <span th:text="*{firstName}">Sebastian</span>.</p>   <p>Surname: <span th:text="*{lastName}">Pepper</span>.</p>   <p>Nationality: <span th:text="*{nationality}">Saturn</span>.</p> </div> . Message Expressions: #{...}:获取国际化内容 . Link URL Expressions: @{...}:定义URL;
      地址中需要参数时用括号包围 @{/order/process(execId=${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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 b补充

 

测试:

   <div th:text="${th}"></div>
    <div th:utext="${th}"></div>

<!--每次遍历都会生成当前这个标签  -->
<p th:text="${th}" th:each="th:${th1}"></p>
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@RequestMapping("/test")
public  String testThymelea(Map<Object,Object> map){
    map.put("th","<h2>helloword</h2>");

    String [] t = {"a","b","c"};
    map.put("th1",t);
    return "th";
}
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posted @ 2020-03-15 14:50  Arbitrary233  阅读(570)  评论(0编辑  收藏  举报