SpringBoot学习_thymeleaf语法
Thymeleaf使用
只要我们把HTML页面放在classpath:/templates/路径下，thymeleaf就能自动渲染；
然后我们就能使用thymeleaf高大上的语法了
首先要导入thymeleaf的命名空间:
<html xmlns:th="http://www.thymeleaf.org">
例子:
controller:
@RequestMapping("success")
public String success(Map<String,Object> map){
map.put("hello","成功");
return "success";
}
html
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Titletitle>
head>
<body>
<div th:text="${hello}">div>
body>
html>
运行就能取到hello中的值了
注意:controller中的方法前面不能用@ResponseBody注解,如果用了不会返回html文件而是返回这个方法对应的字符串返回值
语法规则
th:text:改变当前元素里面的文本内容；
th：任意html属性:来替换原生属性的值,例如:用th:id="${xxx}"来换id="aaa",就是用${xxx}代替了aaa
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="${session.user}：
Name: Sebastian.
Surname: Pepper.
Nationality: Saturn.
Message Expressions: #{...}：获取国际化内容
Link URL Expressions: @{...}：定义URL；
@{/order/process(execId=${execId},execType='FAST')}
Fragment Expressions: ~{...}：片段引用表达式
...
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:没有操作
No‐Operation: _
#例子
controller:
html:(报错是因为ide的问题,没事的)
[[]]相当于th:text会转义特殊字符
[()]相当于th:utext不会转义特殊字符
结果:
