15 SpringBoot模板引擎

時間 2021-08-13

標籤 html java express api session app ide 工具 lua spa 欄目 Spring 简体版

原文原文鏈接

JSP、Velocity、Freemarker、Thymeleaf

SpringBoot推薦的Thymeleaf；
語法更簡單，功能更強大；html

一、引入thymeleaf

二、Thymeleaf使用

只要咱們把HTML頁面放在classpath:/templates/，thymeleaf就能自動渲染；
使用：
一、導入thymeleaf的名稱空間java

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

二、使用thymeleaf語法；
express

三、語法規則

1）、th:text；改變當前元素裏面的文本內容；
th：任意html屬性；來替換原生屬性的值

2）、表達式？api

Simple expressions:（表達式語法）

Variable Expressions: ${...}：獲取變量值；OGNL；
	1）、獲取對象的屬性、調用方法
	
	2）、使用內置的基本對象：
	#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）、內置的一些工具對象：
	#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: *{...}：選擇表達式：和${}在功能上是同樣；
	補充：配合 th:object="${session.user}：
	<div th:object="${session.user}">
		<p>Name: <span th:text="*{firstName}">Sebastian</span>.</p>
		<p>Surname: <span th:text="*{lastName}">Pepper</span>.</p>
		<p>Nationality: <span th:text="*{nationality}">Saturn</span>.</p>
	</div>
	Message Expressions: #{...}：獲取國際化內容
	Link URL Expressions: @{...}：定義URL；
	@{/order/process(execId=${execId},execType='FAST')}
	Fragment Expressions: ~{...}：片斷引用表達式
	<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:（文本操做）
	String concatenation: +
	Literal substitutions: |The name is ${name}|

Arithmetic operations:（數學運算）
	Binary operators: + , ‐ , * , / , %
	Minus sign (unary operator): ‐

Boolean operations:（布爾運算）
	Binary operators: and , or
	Boolean negation (unary operator): ! , not

Comparisons and equality:（比較運算）
	Comparators: > , < , >= , <= ( gt , lt , ge , le )
	Equality operators: == , != ( eq , ne )
	
Conditional operators:條件運算（三元運算符）
	If‐then: (if) ? (then)
	If‐then‐else: (if) ? (then) : (else)
	Default: (value) ?: (defaultvalue)
	
Special tokens:
	No‐Operation: _