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