spring学习笔记(十七)springboot_web开发
程序员文章站
2022-06-12 19:19:55
...
4.4 thymeleaf语法(继上篇)
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
1. Simple expressions:(表达式语法)
1.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.
eg: ${session.foo}
3)、内置的一些工具对象:
#execInfo : information about the template being processed.
#messages : methods for obtaining externalized messages inside variables expressions, in the same way as they would be obtained using #{…} syntax.
#uris : methods for escaping parts of URLs/URIs
#conversions : methods for executing the configured conversion service (if any).
#dates : methods for java.util.Date objects: formatting, component extraction, etc.
#calendars : analogous to #dates , but for java.util.Calendar objects.
#numbers : methods for formatting numeric objects.
#strings : methods for String objects: contains, startsWith, prepending/appending, etc.
#objects : methods for objects in general.
#bools : methods for boolean evaluation.
#arrays : methods for arrays.
#lists : methods for lists.
#sets : methods for sets.
#maps : methods for maps.
#aggregates : methods for creating aggregates on arrays or collections.
#ids : methods for dealing with id attributes that might be repeated (for example, as a result of an iteration).
2.Selection Variable Expressions: *{...}:选择表达式:和${}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>
3.Message Expressions: #{...}:获取国际化内容
4.Link URL Expressions: @{...}:定义URL;
@{/order/process(execId=${execId},execType='FAST')}
5.Fragment Expressions: ~{...}:片段引用表达式
<div th:insert="~{commons :: main}">...</div>
2.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 ,…
3.Text operations:(文本操作)
String concatenation: +
Literal substitutions: |The name is ${name}|
4.Arithmetic operations:(数学运算)
Binary operators: + , - , * , / , %
Minus sign (unary operator): -
5.Boolean operations:(布尔运算)
Binary operators: and , or
Boolean negation (unary operator): ! , not
6.Comparisons and equality:(比较运算)
Comparators: > , < , >= , <= ( gt , lt , ge , le )
Equality operators: == , != ( eq , ne )
7.Conditional operators:条件运算(三元运算符)
If-then: (if) ? (then)
If-then-else: (if) ? (then) : (else)
Default: (value) ?: (defaultvalue)
8.Special tokens:(特殊操作)
无操作
No-Operation: _
4.练习
html:
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<h1>成功!</h1>
<!--th:text 将div里面的文本内容设置为 -->
<div th:id="${hello}" th:text="${hello}">这是显示欢迎信息</div>
<hr/>
<div th:text="${title}">title</div>
<div th:utext="${title}">title</div>
</hr>
<h1>th:each 使用方法一</h1>
<!-- th:each 每次遍历都会生成当前的这个标签 生成3个h4-->
<h4 th:text="${user}" th:each = "user : ${users}"/>
<h1>th:each 使用方法二</h1>
<h4>
<span th:each="user : ${users}"> [[${user}]]</span>
</h4>
</body>
</html>
运行:
网页源代码:
<!DOCTYPE html>
<html lang="en">
<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 id="hello world">hello world</div>
<hr/>
<div><h1>你好</h1></div>
<div><h1>你好</h1></div>
</hr>
<h1>th:each 使用方法一</h1>
<!-- th:each 每次遍历都会生成当前的这个标签 生成3个h4-->
<h4>zhangsan</h4>
<h4>lisi</h4>
<h4>wangwu</h4>
<h1>th:each 使用方法二</h1>
<h4>
<span> zhangsan</span><span> lisi</span><span> wangwu</span>
</h4>
</body>
</html>
下一篇: 退学