SpringBoot2零基础到精通之配置文件与web开发

<dependency>
   <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-configuration-processor</artifactId>
   <optional>true</optional>
</dependency>

@EnableConfigurationProperties({WebMvcProperties.class, WebProperties.class})

//ResourceProperties resourceProperties --> 获取和spring.resources绑定的所有的值的对象
//WebMvcProperties mvcProperties --> 获取和spring.mvc绑定的所有的值的对象
//ListableBeanFactory beanFactory --> Spring的beanFactory
//HttpMessageConverters --> 找到所有的HttpMessageConverters
//ResourceHandlerRegistrationCustomizer --> 找到资源处理器的自定义(重点解析)
//DispatcherServletPath -->  找到资源的路径
//ServletRegistrationBean --> 给应用注册Servlet、Filter....
public WebMvcAutoConfigurationAdapter(ResourceProperties resourceProperties, WebMvcProperties mvcProperties,
			ListableBeanFactory beanFactory, ObjectProvider<HttpMessageConverters> messageConvertersProvider,
			ObjectProvider<ResourceHandlerRegistrationCustomizer> resourceHandlerRegistrationCustomizerProvider,
			ObjectProvider<DispatcherServletPath> dispatcherServletPath,
			ObjectProvider<ServletRegistrationBean<?>> servletRegistrations) {
	this.resourceProperties = resourceProperties;
	this.mvcProperties = mvcProperties;
	this.beanFactory = beanFactory;
	this.messageConvertersProvider = messageConvertersProvider;
	this.resourceHandlerRegistrationCustomizer = resourceHandlerRegistrationCustomizerProvider.getIfAvailable();
	this.dispatcherServletPath = dispatcherServletPath;
	this.servletRegistrations = servletRegistrations;
}

public void addResourceHandlers(ResourceHandlerRegistry registry) {
	// 判断resource.add-mappings的值true/false(默认为true,可以在配置文件修改配置项)
	if (!this.resourceProperties.isAddMappings()) {
		// resource.add-mappings的值为false，则禁用所有的静态资源的访问规则，debug日志输出下面这句话
		logger.debug("Default resource handling disabled");
		return;
	}

	// resource.add-mappings的值true的话，定义规则

	// 定义缓存的相关配置
	Duration cachePeriod = this.resourceProperties.getCache().getPeriod();
	CacheControl cacheControl = this.resourceProperties.getCache().getCachecontrol().toHttpCacheControl();
	// 定义webjars的资源存储规则和缓存时间
    if (!registry.hasMappingForPattern("/webjars/**")) {
		customizeResourceHandlerRegistration(registry.addResourceHandler("/webjars/**")
			.addResourceLocations("classpath:/META-INF/resources/webjars/")
			.setCachePeriod(getSeconds(cachePeriod)).setCacheControl(cacheControl));
	}
	         
	// 定义静态资源的访问规则
	// this.mvcProperties.getStaticPathPattern() --> 获取静态资源的访问方式，默认是\/**
	String staticPathPattern = this.mvcProperties.getStaticPathPattern();
	if (!registry.hasMappingForPattern(staticPathPattern)) {
		customizeResourceHandlerRegistration(registry.addResourceHandler(staticPathPattern)
			// getStaticLocations()方法中
			.addResourceLocations(getResourceLocations(this.resourceProperties.getStaticLocations()))
			.setCachePeriod(getSeconds(cachePeriod)).setCacheControl(cacheControl));
	}
}

@Bean
public WelcomePageHandlerMapping welcomePageHandlerMapping(ApplicationContext applicationContext, FormattingConversionService mvcConversionService, ResourceUrlProvider mvcResourceUrlProvider) {
	// 下面 welcomePageHandlerMapping 的有参函数在下面图片
    WelcomePageHandlerMapping welcomePageHandlerMapping = new WelcomePageHandlerMapping(new TemplateAvailabilityProviders(applicationContext), applicationContext, this.getWelcomePage(), this.mvcProperties.getStaticPathPattern());
    welcomePageHandlerMapping.setInterceptors(this.getInterceptors(mvcConversionService, mvcResourceUrlProvider));
    welcomePageHandlerMapping.setCorsConfigurations(this.getCorsConfigurations());
    return welcomePageHandlerMapping;
}