SpringBoot學習筆記-Web開發
阿新 • • 發佈:2018-11-25
SpringBoot學習筆記-Web開發
Table of Contents
1 SpringBoot與Web開發
1.1 SpringBoot對靜態資源的對映規則
- 引入前端框架資源, 所有
/webjars/**
,都去classpath:/META-INF/resources/webjars
找資源
@Override public void addResourceHandlers(ResourceHandlerRegistry registry) { if (!this.resourceProperties.isAddMappings()) { logger.debug("Default resource handling disabled"); return; } Duration cachePeriod = this.resourceProperties.getCache().getPeriod(); CacheControl cacheControl = this.resourceProperties.getCache() .getCachecontrol().toHttpCacheControl(); if (!registry.hasMappingForPattern("/webjars/**")) { customizeResourceHandlerRegistration(registry .addResourceHandler("/webjars/**") .addResourceLocations("classpath:/META-INF/resources/webjars/") .setCachePeriod(getSeconds(cachePeriod)) .setCacheControl(cacheControl)); } String staticPathPattern = this.mvcProperties.getStaticPathPattern(); if (!registry.hasMappingForPattern(staticPathPattern)) { customizeResourceHandlerRegistration( registry.addResourceHandler(staticPathPattern) .addResourceLocations(getResourceLocations( this.resourceProperties.getStaticLocations())) .setCachePeriod(getSeconds(cachePeriod)) .setCacheControl(cacheControl)); } }
- 引入自己的前端頁面資源, SpringBoot提供一下靜態資源存放的資料夾
classpath: /META-INF/resources/
classpath: /resources/
classpath: /static/
classpath: /public/
/
: 當前頁面的根路徑
- 配置靜態資源路徑
spring: resources: static-locations: classpath:/hello, classpath:/test/
1.2 模板引擎
- 常用的模板引擎
- JSP
- Velocity
- Freemarker
- Thymeleaf
- 模板引擎的原理
- SpringBoot推薦使用
Thymeleaf
模板引擎
1.2.1 引入Thymeleaf
<!-- 引入Thymeleaf模板引擎 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency>
- 切換為
Thymeleaf3
版本
<!-- 佈局功能的支援程式 thymeleaf3主程式 layout2以上版本 --> <properties> <thymeleaf.version>3.0.2.RELEASE</thymeleaf.version> <thymeleaf-layout-dialect.veresion>2.1.1</thymeleaf-layout-dialect.veresion> </properties>
1.2.2 Thymeleaf使用
- 匯入thymeleaf的名稱空間
<html xmlns:th="http://www.thymeleaf.org">
- 使用案例
// 查出一些資料,在頁面展示 @RequestMapping("/success") public String success(Map<String, Object> map) { map.put("hello", "你好"); return "success"; }
<!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 將div裡面的文字內容設定為指定的值--> <div th:text="${hello}">這是顯示歡迎資訊</div> </body> </html>
1.2.3 Thymeleaf語法規則
th:text
: 改變當前元素的文字內容.th:任意html屬性
: 來替換原生html屬性的值.
- 標準表示式語法
Simple expressions:(表示式語法) Variable Expressions: ${...}:獲取變數值;OGNL; 1)、獲取物件的屬性、呼叫方法 2)、使用內建的基本物件: #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. ${session.foo} 3)、內建的一些工具物件: #execInfo : information about the template being processed. #messages : methods for obtaining externalized messages inside variables expressions, in the same way as they would be obtained using #{…} syntax. #uris : methods for escaping parts of URLs/URIs #conversions : methods for executing the configured conversion service (if any). #dates : methods for java.util.Date objects: formatting, component extraction, etc. #calendars : analogous to #dates , but for java.util.Calendar objects. #numbers : methods for formatting numeric objects. #strings : methods for String objects: contains, startsWith, prepending/appending, etc. #objects : methods for objects in general. #bools : methods for boolean evaluation. #arrays : methods for arrays. #lists : methods for lists. #sets : methods for sets. #maps : methods for maps. #aggregates : methods for creating aggregates on arrays or collections. #ids : methods for dealing with id attributes that might be repeated (for example, as a result of an iteration). Selection Variable Expressions: *{...}:選擇表示式:和${}在功能上是一樣; 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: ~{...}:片段引用表示式 <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:(文字操作) String concatenation: + Literal substitutions: |The name is ${name}| Arithmetic operations:(數學運算) Binary operators: + , - , * , / , % Minus sign (unary operator): - Boolean operations:(布林運算) 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(三元運算子) If-then: (if) ? (then) If-then-else: (if) ? (then) : (else) Default: (value) ?: (defaultvalue) Special tokens:
Date: 2018-11-25 08:10
Created: 2018-11-25 日 13:32