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SpringBoot笔记整理（三）

發布時間：2024/7/19 javascript 37 豆豆

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SpringBoot筆記整理（一）
SpringBoot筆記整理（二）
SpringBoot筆記整理（三）
SpringBoot筆記整理（四）

Web開發

1、使用SpringBoot：

1）創建SpringBoot應用，選中需要的模塊
2）SpringBoot已經默認將這些場景配置好了，只需要在配置文件中指定少量配置就可以運行起來
3）自己編寫業務代碼

自動配置原理

xxxAutoConfiguration：幫我們給容器中自動配置組件 xxxProperties：配置類來封裝配置文件的內容

2、SpringBoot對靜態資源的映射規則

@ConfigurationProperties(prefix = "spring.resources",ignoreUnknownFields = false ) public class ResourceProperties {//可以設置和靜態資源有關的參數，緩存時間等 public void addResourceHandlers(ResourceHandlerRegistry registry) {if (!this.resourceProperties.isAddMappings()) {logger.debug("Default resource handling disabled");} else {Duration cachePeriod = this.resourceProperties.getCache().getPeriod();CacheControl cacheControl = this.resourceProperties.getCache().getCachecontrol().toHttpCacheControl();if (!registry.hasMappingForPattern("/webjars/**")) {this.customizeResourceHandlerRegistration(registry.addResourceHandler(new String[]{"/webjars/**"}).addResourceLocations(new String[]{"classpath:/META-INF/resources/webjars/"}).setCachePeriod(this.getSeconds(cachePeriod)).setCacheControl(cacheControl));}String staticPathPattern = this.mvcProperties.getStaticPathPattern();if (!registry.hasMappingForPattern(staticPathPattern)) {this.customizeResourceHandlerRegistration(registry.addResourceHandler(new String[]{staticPathPattern}).addResourceLocations(WebMvcAutoConfiguration.getResourceLocations(this.resourceProperties.getStaticLocations())).setCachePeriod(this.getSeconds(cachePeriod)).setCacheControl(cacheControl));}} }//配置歡迎頁映射 @Bean public WelcomePageHandlerMapping welcomePageHandlerMapping(ApplicationContext applicationContext, FormattingConversionService mvcConversionService, ResourceUrlProvider mvcResourceUrlProvider) {WelcomePageHandlerMapping welcomePageHandlerMapping = new WelcomePageHandlerMapping(new TemplateAvailabilityProviders(applicationContext), applicationContext, this.getWelcomePage(), this.mvcProperties.getStaticPathPattern());welcomePageHandlerMapping.setInterceptors(this.getInterceptors(mvcConversionService, mvcResourceUrlProvider));return welcomePageHandlerMapping; }

1）所有/webjars/**，都去classpath:/META-INF/resources//webjars/找資源
webjars：以jar包的方式引入靜態資源；
https://www.webjars.org/

<dependency><groupId>org.webjars</groupId><artifactId>jquery</artifactId><version>3.4.1</version> </dependency>

2）“/**”訪問當前項目的任何資源（靜態資源的文件夾）

"classpath:/META-INF/resources/", "classpath:/resources/", "classpath:/static/", "classpath:/public/" "/":當前項目的根路徑

3）歡迎頁：靜態資源文件夾下的所有index.html頁面，被"/"映射
4）所有的/favicon.ico 都是在靜態資源文件下找

3、模板引擎

SpringBoot推薦的Thymeleaf：語法更簡單，功能更強大
3.1 引入Thymeleaf

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency>

3.2 Thymeleaf使用&語法

@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";private String mode = "HTML";//只要把html頁面放在classpath:/templates/，thymeleaf就能自動渲染

使用：
3.2.1 導入thymeleaf的名稱空間

3.2.2 使用thymeleaf語法

<!DOCTYPE html> <html lang="en" xmlns:th="http://www/thymeleaf.org"> <head><meta charset="UTF-8"><title>Title</title> </head> <body><h1>success</h1><div th:text="${hello}">這里顯示歡迎信息</div> </body> </html>

1）th:text：改變當前元素里面的文本內容
th：任意html屬性，來替換原生屬性的值

2）表達式語法

Simple expressions:Variable Expressions: ${...}Selection Variable Expressions: *{...}Message Expressions: #{...}Link URL Expressions: @{...}Fragment Expressions: ~{...} LiteralsText literals: 'one text', 'Another one!',...Number literals: 0, 34, 3.0, 12.3,...Boolean literals: true, falseNull literal: nullLiteral tokens: one, sometext, main,... Text operations:String concatenation: +Literal substitutions: |The name is ${name}| Arithmetic operations:Binary operators: +, -, *, /, %Minus sign (unary operator): - Boolean operations:Binary operators: and, orBoolean negation (unary operator): !, not Comparisons and equality:Comparators: >, <, >=, <= (gt, lt, ge, le)Equality operators: ==, != (eq, ne)Conditional operators:If-then: (if) ? (then)If-then-else: (if) ? (then) : (else)Default: (value) ?: (defaultvalue) Special tokens:No-Operation: _

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