SpringBoot-web模板引擎Thymeleaf(七)

JSP、Velocity、Freemarker、Thymeleaf都是模板引擎.

把模板和数据放到模板引擎中,然后解析输出.

SpringBoot推荐使用Thymeleaf；

Thymeleaf语法更简单，功能更强大.

1、引入Thymeleaf

maven依赖:

<dependency>
  <groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf
</artifactId>2.1.6
</dependency>

我们也可以自己到SpringBoot的官网找自己想要的版本.

但是要注意切换thymeleaf版本需要到maven的配置文件properties中设置,关于thymeleaf的版本一般都放在了github上搜索即可看到.

如果我们的thymeleaf是3版本以上的 layout2以上版本 .

<properties>
        <thymeleaf.version>3.0.9.RELEASE</thymeleaf.version>    
        <thymeleaf-layout-dialect.version>2.2.2</thymeleaf-layout-dialect.version>
  </properties>

2、Thymeleaf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；

使用：

1、导入thymeleaf的名称空间.

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

2、使用thymeleaf语法；

controller中携带一个参数,在html中获取

@RequestMapping("/success")
    public String success(Model model){
  model.addAttribute("msg","你好");
    return "success";
    }
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>你好啊</h1>
<div th:text="${msg}"></div>
</body>
</html>

访问:localhost:8080/success    就可以获取到''你好''这个值了.

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)

Variable Expressions: ${...}：获取变量值.

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

他可以配合配合 th:object来用

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: _

 

posted @ 2019-08-13 22:21  七月的风没有雨  阅读(255)  评论(0)    收藏  举报