springboot学习 之 模板引擎 Thymeleaf

模板引擎

JSP、Velocity、Freemarker、Thymeleaf

SpringBoot推荐的Thymeleaf

语法更简单，功能更强大

1、引入thymeleaf

官方文档：https://docs.spring.io/spring-boot/docs/1.5.10.RELEASE/reference/htmlsingle/

    <!-- 引入thymeleaf -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
​
    <!-- 切换thymeleaf版本 -->
    <properties>
            <thymeleaf.version>3.0.11.RELEASE</thymeleaf.version>
            <!--布局功能支持程序 thymeleaf3主程序 layout2以上版本-->
            <!-- thymeleaf2 layout1 -->
            <thymeleaf-layout-dialect.version>2.4.1</thymeleaf-layout-dialect.version>
    </properties>

2、Thymeleaf 使用 & 语法

@ConfigurationProperties(
    prefix = "spring.thymeleaf"
)
public class ThymeleafProperties {
    private static final Charset DEFAULT_ENCODING;
    public static final String DEFAULT_PREFIX = "classpath:/templates/";
    public static final String DEFAULT_SUFFIX = ".html";
    private boolean checkTemplate = true;
    private boolean checkTemplateLocation = true;
    private String prefix = "classpath:/templates/";
    private String 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
<!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里面文本内容设置为指定的值 -->
<P th:text="${hello}">这是显示欢迎信息</P>
</body>
</html>
3、语法规则

（1）th:text 覆盖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:(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.
​
        ${session.foo}
        3）内置的一些工具对象
        #execInfo : information about the template being processed.
        #messages : methods for obtaining externalized messages inside variables expressions, in the same way as they
        would be obtained using #{…} syntax.
        #uris : methods for escaping parts of URLs/URIs
        Page 20 of 106
        #conversions : methods for executing the configured conversion service (if any).
        #dates : methods for java.util.Date objects: formatting, component extraction, etc.
        #calendars : analogous to #dates , but for java.util.Calendar objects.
        #numbers : methods for formatting numeric objects.
        #strings : methods for String objects: contains, startsWith, prepending/appending, etc.
        #objects : methods for objects in general.
        #bools : methods for boolean evaluation.
        #arrays : methods for arrays.
        #lists : methods for lists.
        #sets : methods for sets.
        #maps : methods for maps.
        #aggregates : methods for creating aggregates on arrays or collections.
        #ids : methods for dealing with id attributes that might be repeated (for example, as a result of an iteration).
Selection Variable Expressions: *{...}  选择表达式：和${}在功能上是一样
        补充：配合 th:object="${session.user}"
        <div th:object="${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:(特殊操作)
    No-Operation: _

 

 

posted on 2020-04-10 23:16  Windy心梦无痕  阅读(139)  评论(0)    收藏  举报