通过源码可以知道，只要我们将html页面放在"classpath:/templates/" thymeleaf就能自动渲染
@ConfigurationProperties(prefix = "spring.thymeleaf")
public class ThymeleafProperties {
private static final Charset DEFAULT_ENCODING = StandardCharsets.UTF_8;
public static final String DEFAULT_PREFIX = "classpath:/templates/";
public static final String DEFAULT_SUFFIX = ".html";
}
1、导入名称命名空间
<html lang="en" xmlns:th="http://www.thymeleaf.org">
2、语法：
1 Simple expressions:（表达式语法）
2 Variable Expressions: ${...}：获取变量值；OGNL；
3 1）、获取对象的属性、调用方法
4 2）、使用内置的基本对象：
5 #ctx : the context object.
6 #vars: the context variables.
7 #locale : the context locale.
8 #request : (only in Web Contexts) the HttpServletRequest object.
9 #response : (only in Web Contexts) the HttpServletResponse object.
10 #session : (only in Web Contexts) the HttpSession object.
11 #servletContext : (only in Web Contexts) the ServletContext object.
12 ${session.foo}
13 3）、内置的一些工具对象：
14 #execInfo : information about the template being processed.
15 #messages : methods for obtaining externalized messages inside variables expressions, in the
16 same way as they would be obtained using #{…} syntax.
17 #uris : methods for escaping parts of URLs/URIs
18 #conversions : methods for executing the configured conversion service (if any).
19 #dates : methods for java.util.Date objects: formatting, component extraction, etc.
20 #calendars : analogous to #dates , but for java.util.Calendar objects.
21 #numbers : methods for formatting numeric objects.
22 #strings : methods for String objects: contains, startsWith, prepending/appending, etc.
23 #objects : methods for objects in general.
24 #bools : methods for boolean evaluation.
25 #arrays : methods for arrays.
26 #lists : methods for lists.
27 #sets : methods for sets.
28 #maps : methods for maps.
29 #aggregates : methods for creating aggregates on arrays or collections.
30 #ids : methods for dealing with id attributes that might be repeated (for example, as a
31 result of an iteration).
32 Selection Variable Expressions: *{...}：选择表达式：和${}在功能上是一样；
33 补充：配合 th:object="${session.user}：
34 <div th:object="${session.user}">
35 <p>Name: <span th:text="*{firstName}">Sebastian</span>.</p>
36 <p>Surname: <span th:text="*{lastName}">Pepper</span>.</p>
37 <p>Nationality: <span th:text="*{nationality}">Saturn</span>.</p>
38 </div>
39 Message Expressions: #{...}：获取国际化内容
40 Link URL Expressions: @{...}：定义URL；
41 @{/order/process(execId=${execId},execType=‘FAST‘)}
42 Fragment Expressions: ~{...}：片段引用表达式
43 <div th:insert="~{commons :: main}">...</div>
44 Literals（字面量）
45 Text literals: ‘one text‘ , ‘Another one!‘ ,…
46 Number literals: 0 , 34 , 3.0 , 12.3 ,…
47 Boolean literals: true , false
48 Null literal: null
49 Literal tokens: one , sometext , main ,…
50 Text operations:（文本操作）
51 String concatenation: +
52 Literal substitutions: |The name is ${name}|
53 Arithmetic operations:（数学运算）
54 Binary operators: + , ‐ , * , / , %
55 Minus sign (unary operator): ‐
56 Boolean operations:（布尔运算）
57 Binary operators: and , or
58 Boolean negation (unary operator): ! , not
59 Comparisons and equality:（比较运算）
60 Comparators: > , < , >= , <= ( gt , lt , ge , le )
61 Equality operators: == , != ( eq , ne )
62 Conditional operators:条件运算（三元运算符）
63 If‐then: (if) ? (then)
64 If‐then‐else: (if) ? (then) : (else)
65 Default: (value) ?: (defaultvalue)
66 Special tokens:
67 No‐Operation: _ 没有操作 比如三元运算符 不符条件没有操作 就可以在else后面加_
原文：https://www.cnblogs.com/lxy-java/p/12993965.html